DESC:FORM 2

THE PATENTS ACT, 1970

(39 of 1970)

&

THE PATENT RULES, 2003

COMPLETE SPECIFICATION

[See Section 10 and Rule 13]

TITLE:

“AN IMPROVED WINDSHIELD WASHER PUMP”

APPLICANT:

PV CLEAN MOBILITY TECHNOLOGIES PRIVATE LIMITED
a company incorporated under the Indian Companies Act, 2013
having address at
9.1 Mile Stone, Gurgaon Farookhnagar Road, Village Dhankot,
Gurgaon 122001, Haryana, India

PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the invention and the manner in which it is to be performed:
FIELD OF THE INVENTION
The present invention pertains to the field of washer pumps. More particularly, the present invention relates to an improved windshield washer pump assembly to prevent fluid leakage, enhance safety, and increase durability.

BACKGROUND OF THE INVENTION
The windshield washer pump is one of the most crucial components in vehicles, responsible for spraying washer fluid onto the windshield. This fluid typically consists of water mixed with the manufacturer's recommended windshield cleaning chemical, aimed at keeping the windshield clean and free from scratches. Generally, the primary components are connected to the windshield washer pump.
During general usage of the entire washing mechanism, the windshield washer pump is highly susceptible to various problems such as dust and corrosion issues, blockages, and leakage within the pump housing. Additionally, components like the impeller and motor are enclosed within the housing and secured using adhesive, which can lose its adhesiveness over time due to continuous exposure to fluid. This makes the components vulnerable to physical shocks and water seepage.
CN1884839A provides an automobile bidirectional air window washing pump characterized in that a pump body is formed by a pump cover, a shell and an end cover which are bonded with each other through seam allowance glue. The pump is characterized in that a motor is arranged in a shell of the pump body, a connector of the motor is connected with an end cover, an impeller which is connected with a motor shaft and rotates is arranged in a pump cover, a flow guide opening and a flow guide opening in a pump cavity are connected with a water flow direction control cavity, a valve ball which is the same as the water flow direction control cavity in size is arranged in the water flow direction control cavity, and water outlets and are arranged at two ends of the water. The main drawback of the prior art is that the components are attached with each other with seam allowance glue which losses it adhesiveness due to continuous exposure in the water that effects the durability of the washer pump.
A notable limitation of the prior art lies in the use of seam allowance glue to attach components, which losses it diminishes in adhesiveness over time due to continuous water exposure in the water that effects, impacting the durability of the washer pump.
Due to aforementioned drawbacks, there is a need to provide an improved windshield washer pump that prevents fluid leakage and ensures safety, durability and longevity.

OBJECT OF THE INVENTION
The main object of the present invention is to provide an improved windshield washer pump making it safe, durable and long lasting.
Another object of the present invention is to provide an improved windshield washer pump that prevents leakage of the fluid from the washer pump.
Yet another object of the present invention is to provide an improved windshield washer pump in which components of washer pump are joined by ultrasonic welding that provides a strong and permanent connection between the components.
Yet another object of the present invention is to provide an improved windshield washer pump that includes an O-ring that serves as critical component in preventing leakage, thereby providing an extra layer of protection against environmental factors such as moisture or contaminants.
Yet another object of the present invention is to provide an improved windshield washer pump that includes a lip seal for preventing entry of water in the motor area of the pump.
Still another object of the present invention is to provide a cost-effective windshield washer pump with an annular snap feature for preventing accidental disconnections and ensuring stable electrical and mechanical connections during operation.

SUMMARY OF THE INVENTION
The present invention pertains to the washer pump field, specifically focusing on an enhanced windshield washer pump. This innovation ensures a leak-proof system, preventing fluid leakage, and offers an economical solution while addressing while addressing safety, durability, and longevity.
In a preferred embodiment, the present invention provides an improved windshield washer pump comprising: a connector, a connector terminal, a motor, a motor shaft, a housing, an O-ring, a lip seal, an impeller, and a bottom cover. The connector terminal is provided to attach the connector with the motor. The motor is placed in the motor assembly and accommodated in the housing provided to prevent entry of water inside the motor. The lip seal is placed around the motor shaft provided to prevent entry of water inside the motor. The impeller is rotatably attached to the motor shaft provided to energize the impeller to suck the fluid from an inlet and to pump out the fluid from an outlet. The bottom cover is attached to lower portion of the housing. The connector is coupled with the housing by the O-ring being provided to prevent leakage.
The above objects and advantages of the present invention will become apparent from the hereinafter set forth brief description of the drawings and description of the invention.
BRIEF DESCRIPTION OF THE DRAWING
An understanding of the improved windshield washer pump of the present invention may be obtained by reference to the following figures:
Figure 1 is an exploded view of the improved windshield washer pump, according to an embodiment of the present invention.
Figure 2 is a perspective view of the improved windshield washer pump, according to an embodiment of the present invention.
Figure 3 is a cross-sectional view of the improved windshield washer pump, according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION
The present invention will now be described hereinafter with reference to the accompanying drawings in which a preferred embodiment of the invention is shown. This invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiment set forth herein. Rather, the embodiment is provided so that this disclosure will be thorough, and will fully convey the scope of the invention to those skilled in the art.
The present invention now will be described hereinafter with reference to the description, in which some, but not all embodiments of the invention are indicated. Indeed, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like numbers refer to like elements throughout. The present invention is described fully herein with non-limiting embodiments and exemplary experimentation.
Referring to Figure 1, is an exploded view of the windshield washer pump (100), according to an embodiment of the present invention is depicted. The windshield washer pump (100) comprises a housing (106), a connector assembly, an impeller (108), a bottom cover (109). The housing (106) accommodates a motor assembly and the motor assembly includes a motor (104) and a motor shaft (110) connected to the motor (104). The motor (104) is a brushed direct current motor and is equipped with a slotted shaft structure for ensuring that the impeller (108) rotates in accurate direction. The housing (106) is made from polyoxymethylene material via an injection moulding process.
Further, over the motor assembly, the connector assembly is positioned and the connector assembly includes a connector (101), a connector terminal (102) coupled to the connector (101) and an annular snap feature that allows for a secure locking of the connector (101) with the windshield washer pump (100), thereby preventing an accidental disconnection and ensuring stable electrical and mechanical connections during an operation.
The connector assembly is made of brass. The connector assembly is equipped with an O-ring (103) for providing an extra layer of protection against one or more environmental factors that include moisture, contaminates and alike...
Also, the motor (104) and the impeller (108) incorporates a D-cut feature for ensuing precise alignment and secure engagement between the impeller (108) and the motor shaft (110), thereby enabling an installation process.
The windshield washer pump (100) include a lip seal (105) that is positioned around the motor shaft (110) for preventing water ingress alongside with the motor shaft (110), thereby protecting the windshield washer pump (100). The lip seal (105) is preferably made from a nitrile butadiene rubber and the lip seal (105) is made from other types of rubber such as carboxylated nitrile butadiene rubber (XNBR) or any other standard rubber which is known to person skilled in the art.
Further, the impeller (108) is rotatably attached to the motor shaft (110) and the motor shaft (110) energizes the impeller (108) to draw a fluid from an inlet and to pump out the fluid from an outlet.
Furthermore, the windshield washer pump (100) includes a filter (107) that is positioned and press-fitted at the inlet for preventing waterborne matter from entering the windshield washer pump (100). The filter (107) is fine mesh and a strainer with a filtration capacity ranging from 0.55 mm to 0.75 mm.
Also, the bottom cover (109) is welded to the housing (106) to create a leak-proof seal, thereby preventing a fluid leakage from the windshield washer pump (100). The bottom cover (109) is ultrasonically welded to the housing (106) for creating a permanent and water-resistant bond.
Referring to Figure 2 and Figure 3, a perspective view and a cross-sectional view of the windshield washer pump (100), according to an embodiment of the present invention are depicted. In the present invention, the connector assembly have connector terminals (102) that are preferably made of brass and the connector terminals are made up of other materials such as copper, zinc which are known to person skilled in the art. Also, it is known to a person skilled in the art that brass exhibits excellent electrical conductivity and mechanical strength. The connector terminals (102) are precisely molded into the shape of the connector (101) using one or more molding techniques. This molding process allows for a high level of precision in the connector assembly, ensuring that the connector terminals (102) are securely integrated into the connector (101) for optimal performance.
The connector assembly also incorporates the annular snap feature that allows for easy and secure locking of the connector (101) with the pump. This annular snap mechanism ensures that the connector (101) stays firmly in place, preventing accidental disconnections and ensuring stable electrical and mechanical connections during operation.
In addition to the annular snap feature, the connector assembly is equipped with the O-ring. The O-ring (103) serves as a critical component in preventing leakage, providing an extra layer of protection against environmental factors such as moisture or contaminants. Further, the O-ring provides a leak-proof structure that significantly enhances the windshield washer pump (100) by ensuring that the internal components remain sealed and free from external influences, thus extending the lifespan and performance of the pump.
The motor (104) used in the motor assembly is the brushed direct current type and it is known to a person skilled in the art that brushed direct current type shows exceptional performance, particularly when operating at high revolutions per minute. This characteristic is essential to meet the flow requirements of the pump, ensuring that it provides the necessary power and efficiency for optimal operation. The motor (104) is equipped with the slotted shaft structure, which plays a crucial role in ensuring that the impeller (108) rotates in the correct direction. This mechanism ensures precise and effective movement, contributing to the overall functionality of the present invention.
The motor (104) is securely pressed into the housing (106), ensuring a stable and reliable fit. However, before this step, the lip seal (105) is inserted into the area of motor (104) in the housing (106). This lip seal (105), made from nitrile butadiene rubber and carefully pressed into place to prevent water from entering the area of motor (104). The rubber material is chosen for its excellent elasticity, which allows it to form a tight seal that effectively blocks water and other contaminants from reaching the motor (104). This ensures that the motor (104) remains protected from moisture, which otherwise lead to damage or reduced performance over time.
The housing (106) is made from POM (Polyoxymethylene) material, a durable and cost-efficient plastic commonly used in manufacturing washer pump housings. The housing (106) is produced through an injection molding process, that allows for precise shaping and mass production, ensuring consistent quality and cost-effectiveness.
Once the lip seal (105) is securely pressed into the housing (106), the motor (104) is also pressed into the housing (106), ensuring a tight and secure fit that keeps the motor (104) stable during operation. The next assembly step involves the connector assembly, which is attached to the housing (106) using an annular snap feature. This annular snap mechanism ensures that the connector (101) is securely locked into place, simplifying the assembly process and ensuring a reliable connection for electrical and mechanical functionality.
The motor (104) is constructed with a dedicated slot to accommodate the terminal assembly of the connector (101). This slot ensures that the connector assembly is consistently installed in the correct orientation during the assembly process. Proper alignment is critical as it guarantees electrical continuity between the motor terminals and the connector (101).
At bottom area of the housing (106), components like pump inlet, pump outlet, volute profile are present to meet desire flow of the pump, pump inlets and outlet dimensions necessary to control as per vehicle fitment, molding process excellence to meet dimensions.
The impeller (108) is an open type impeller, which is highly effective for facilitating fluid flow. Its construction allows for efficient handling of liquids and promotes smooth operation within the pump system. The impeller (108) is constructed as a slide-fit assembly, enabling it to be effortlessly mounted onto the motor shaft. The motor shaft (110) and impeller (108) incorporates a D-cut feature, ensuring precise alignment and secure engagement between the impeller (108) and the shaft, which simplifies the installation process.
Additionally, the pump includes a bottom cover (109) that serves as a seal for the entire pumping unit, effectively enclosing the system from the underside. This bottom cover (109) is securely affixed using ultrasonic welding. The ultrasonic welding process creates a robust bond that ensures the bottom cover (109) withstand internal pressures and securely retain the fluid within the pumping chamber.
The additional component of the windshield washer pump (100) is the filter (107), which plays a crucial role in preventing waterborne dust and particulate matter from entering the pump. This filter (107) is strategically positioned at the pump's inlet and is press-fitted into place for a secure and stable installation. It features a fine mesh or strainer with a filtration capacity ranging from 0.75 mm, effectively blocking particles larger than this threshold from entering the pump system. This precise level of filtration ensures that only clean water flows into the windshield washer pump (100), protecting its internal components from damage or wear caused by abrasive particles.
The assembly process of the windshield washer pump (100) is specifically constructed to be efficient and straightforward, enabling easy integration into the vehicle's system. This streamlined process not only ensures high-quality assembly but also minimizes errors, thereby improving the overall productivity of the manufacturing operation.
Furthermore, the advanced manufacturing techniques used in the production of windshield washer pumps (100) contribute significantly to reducing production costs. By optimizing material usage, enhancing assembly efficiency, and implementing cost-effective processes, manufacturers achieve a balance between quality and affordability. As a result, the overall productivity is increased.
Therefore, the present invention relates to an improved windshield washer pump that provides leak proof washer pump that prevents leakage of the fluid from the washer pump and provides an economical washer pump making it safe, durable, long lasting and reducing maintenance cost.
Many modifications and other embodiments of the invention set forth herein will readily occur to one skilled in the art to which the invention pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the invention. The embodiments were chosen and described in order to explain the principle of the invention and its practical application to enable one skilled in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated.
,CLAIMS:CLAIMS

We claim:
1. A windshield washer pump (100) comprising:
a housing (106);
a connector assembly;
an impeller (108); and
a bottom cover (109);
wherein:
said housing (106) accommodates a motor assembly and the motor assembly includes a motor (104) and a motor shaft (110) connected to the motor (104);
said windshield washer pump (100) includes a lip seal (105) that is positioned around the motor shaft (110) for preventing water ingress alongside the motor shaft (110), thereby protecting the windshield washer pump (100);
said impeller (108) is rotatably attached to said motor shaft (110) of a motor (104) and the motor shaft (110) energizes said impeller (108) to draw a fluid from an inlet and to pump (100) out the fluid from an outlet;
said windshield washer pump (100) include a filter (107) that is positioned and press-fitted at the inlet for preventing waterborne matter from entering the windshield washer pump (100); and
said bottom cover (109) is welded to the housing (106) to create a leak-proof seal, thereby preventing a fluid leakage from the windshield washer pump (100).
2. The windshield washer pump (100) as claimed in claim 1, wherein said connector assembly include connector (101), a connector terminal (102) that coupled to the connector (101) and an annular snap feature that allows for a secure locking of the connector (101) with the windshield washer pump (100), thereby preventing an accidental disconnection and ensuring stable electrical and mechanical connections during an operation.
3. The windshield washer pump (100) as claimed in claim 1, wherein said connector assembly is made of brass.
4. The windshield washer pump (100) as claimed in claim 1, wherein said connector assembly is equipped with an O-ring (103) assembly for providing an extra layer of protection against one or more environmental factors that include moisture, contaminates and alike.
5. The windshield washer pump (100) as claimed in claim 1, wherein said motor (104) is a brushed direct current motor and is equipped with a slotted shaft structure for ensuring that the impeller (108) rotates in accurate direction.
6. The windshield washer pump (100) as claimed in claim 1, wherein said lip seal (105) is made from a nitrile butadiene rubber.
7. The windshield washer pump (100) as claimed in claim 1, wherein said housing (106) is made from polyoxymethylene material via an injection moulding process.
8. The windshield washer pump (100) as claimed in claim 1, wherein said impeller (108) is a slide-fit assembly.
9. The windshield washer pump (100) as claimed in claim 1, wherein said motor (104) and said impeller (108) incorporate a D-cut feature for ensuing precise alignment and secure engagement between the impeller (108) and the motor shaft (110), thereby enabling an installation process.
10. The windshield washer pump (100) as claimed in claim 1, wherein said filter (107) is fine mesh and a strainer with a filtration capacity ranging from 0.55 mm to 0.75 mm.
11. The windshield washer pump (100) as claimed in claim 1, wherein said bottom cover (109) is ultrasonically welded to the housing (106) for creating a permanent and water-resistant bond.