DESC:FORM 2

THE PATENTS ACT, 1970

(39 of 1970)

&

THE PATENT RULES, 2003

COMPLETE SPECIFICATION

[See Section 10 and Rule 13]

TITLE:

“MASTER CYLINDER RESERVOIR ASSEMBLY”

APPLICANT:

PADMINI VNA MECHATRONICS LIMITED
a company incorporated under the Indian companies Act, 1956
having address at
Plot No. 100-101, Sector 35, Phase VII, Udyog Vihar, Gurgaon,
Haryana 122001, 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 relates to a master cylinder reservoir assembly. More particularly, the present invention relates to a window formed in a lateral side wall of a brake fluid reservoir so that the level of liquid in the master cylinder reservoir is visually determined by observing the liquid level through the window.
BACKGROUND OF THE INVENTION
The hydraulic braking systems, commonly used in two-wheelers, rely on components that work together to provide controlled braking force. The system includes a master cylinder assembly, which serves as the primary actuator that converts the two-wheelers brake lever input into hydraulic pressure, allowing the brake calipers to engage effectively. The master cylinder assembly includes a master cylinder reservoir, which stores and maintains an adequate supply of brake fluid. The reservoir ensures that the braking system functions consistently over time, compensating the fluid displacement due to brake pad wear. The hydraulic brake relies on incompressible fluid to transmit force, maintaining a minimum brake fluid level that is essential to prevent air from entering the system. Any presence of air in the braking system can significantly reduce braking efficiency, leading to compromised vehicle safety.
To facilitate monitoring of brake fluid levels, an oil level window is integrated into the reservoir. The transparent or semi-transparent component provides a visual indication of the fluid level, enabling users or technicians to check whether the reservoir contains sufficient brake fluid. Ensuring a secure and reliable attachment of the oil level window is crucial, as any failure in its placement may lead to brake fluid leakage and subsequent system malfunction.
Currently, during the vehicle assembly process, brake fluid is filled into the system under pressure approximately 5 bar. This pressure sometimes dislodge the oil level window, resulting in brake fluid leakage and rendering the master cylinder assembly defective. Consequently, the master assembly is required to replaced, leading to increased costs, and a reduction in overall reliability of the braking system.
JP3316885B2, the master cylinder assembly is provided with an oil level check window on a side surface thereof, and the master cylinder assembly is provided with a front handle cover. The inspection window slightly protrudes upward from a notch formed on the upper surface of the front handle cover, and the inspection window extends obliquely upward in a direction A through a gap S between the notch of the front handle cover and the master cylinder assembly. The operator checks the oil level by looking into the inspection window. However, the window disclosed in this invention may pop out during the filing of brake fluid in the reservoir.
Therefore, there is requirement of the present invention which provide a secure, durable and reliable attachment of the oil level window to the reservoir, preventing dislodgement under pressure while maintaining clear visibility of the brake fluid level.
OBJECT OF THE INVENTION
The main object of the present invention is to provide a master cylinder reservoir assembly which includes a window formed in one of a lateral side wall of a brake fluid reservoir so that the level of liquid in the master cylinder reservoir is visually determined.
Another object of the present invention is to provide the master cylinder reservoir assembly having a secure and durable attachment of the window.
Yet another object of the present invention is to provide a master cylinder reservoir assembly which prevents dislodgement of the window under pressure while maintaining clear visibility of the brake fluid level.
Still another object of the present invention is to provide the master cylinder reservoir assembly having a reliable attachment of the window.
SUMMARY OF THE INVENTION
The present invention relates to a master cylinder reservoir assembly which includes a window formed in one of its lateral side wall so that the level of liquid in the master cylinder reservoir is visually determined.
In an embodiment, the present invention provides a master cylinder reservoir assembly which includes a brake fluid reservoir having a plurality of side walls. On one of a lateral side wall, a cavity is provided to incorporate a window. In an embodiment of the present invention, the shape of the window and the cavity is understood as a circle but not limited to a square or rectangle or any other shape. The cavity include a circular groove to hold the window inside. An O-ring is incorporated on the outer circumference of the window. The window having the O-ring is fitted in the cavity having the circular groove. The O-ring prevents the brake oil leakage from the reservoir due to its interference with inner diameter of the circular groove and outer diameter of window upon fitting. The O-ring remains in compressed condition upon fitting to prevent leakage of brake oil. After the window along with the O-ring is fitted in the cavity, a fastening clip is fastened to securely lock the window inside the cavity. The fastening clip ensures that the window is locked inside the cavity and prevents popping out during pressurized filling of brake oil in the reservoir.
BRIEF DESCRIPTION OF THE DRAWING
An understanding of a master cylinder reservoir assembly of the present invention may be obtained by reference to the following drawings:
Figure 1 is a perspective view of the master cylinder reservoir assembly according to an embodiment of the present invention.
Figure 2 is an exploded view of section A’ of the master cylinder reservoir assembly according to an embodiment of the present invention.
Figure 3(a) is a top view of the master cylinder reservoir assembly according to an embodiment of the present invention.
Figure 3(b) is a sectional view of an oil level window of the master cylinder reservoir assembly 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.
Many aspects of the invention can be better understood with references made to the drawings below. The components in the drawings are not necessarily drawn to scale. Instead, emphasis is placed upon clearly illustrating the components of the present invention. Moreover, like reference numerals designate corresponding parts through the several views in the drawings. Before explaining at least one embodiment of the invention, it is to be understood that the embodiments of the invention are not limited in their application to the details of construction and to the arrangement of the components set forth in the following description or illustrated in the drawings. The embodiments of the invention are capable of being practiced and carried out in various ways. In addition, the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.
Referring to Figure 1, a perspective view of the master cylinder reservoir assembly is depicted. The master cylinder reservoir assembly (100) includes a brake fluid reservoir (102) which forms a part of the master cylinder reservoir assembly (100). In an embodiment of the present invention, the master cylinder reservoir assembly (100) is for a straddle-type vehicle such as a motorcycle, a three-wheeled buggy, and a four-wheeled buggy mounted in a state of being exposed to the outside. In another embodiment of the present invention, the master cylinder reservoir assembly (100) is for a front wheel braking operated by a driver's right hand. In another embodiment of the present invention, the master cylinder reservoir assembly (100) is also applicable to a master cylinder for rear wheel braking and a master cylinder for clutch operated by the driver's left hand, in which case the left and right in the following description are reversed.
The master cylinder reservoir assembly (100) is attached to a mounting portion (not shown) located on a steering bar (not shown) of the vehicle. The master cylinder reservoir assembly (100) includes a holder (104), a projection body (106), at least two fastening member (108), a brake lever (110), a support member (112), a lid (114) and a window (116) (shown in Figure 2). The projection body (106) includes a mounting seat portion (118) to project rearward (depicted in Figure 1). The holder (104) and mounting seat portion (118) conjoint to form a through hole in which the mounting portion of the steering bar (not shown) of the vehicle is sandwiched. The mounting seat portion (118) and the holder (104) are connected by the at least two fastening member (108). The brake lever (110) is mounted on the projection body (106) by the support member (112). The lid (114) is suitably secured to the brake fluid reservoir (102). Section A’ depicted in Figure 1 is described in detail in subsequent paragraphs.
Referring to Figure 2, an exploded view of section A’ of the master cylinder reservoir assembly is depicted. The brake fluid reservoir (102) have a plurality of side walls. On one of a lateral side wall (202) at section A’ shown in Figure 1, a cavity (204) is provided to incorporate the window (116). In an embodiment of the present invention, the shape of the window (116) and cavity (204) is understood as a circle but is not limited to a square or rectangle or any other shape. The cavity (204) includes a circular groove (not shown) to hold the window (116) inside. An O-ring (206) is incorporated on the outer circumference of the window (116). The window (116) having the O-ring (206) is fitted in the cavity (204) having the circular groove. The O-ring (206) prevents the brake oil leakage from the reservoir (102) due to its interference with inner diameter of circular groove and outer diameter of window (116) upon fitting. The O-ring (206) remains in compressed condition upon fitting to prevent leakage of brake oil. After the window (116) along with the O-ring (206) is fitted in the cavity (204) and a fastening clip (208) is fastened to securely lock the window (116) inside the cavity (204). The fastening clip (208) ensures that the window (116) to lock inside the cavity (204) and prevents popping out during pressurized filling of brake oil in the reservoir (102).
In an embodiment of the present invention, the O-ring (206) is made of material which is understood as a rubber or any other similar material. In an embodiment of the present invention, the fastening clip (208) includes a C-clip, circlip, snap ring, Jesus clip or any similar fastening mechanism.
Referring to Figure 3(a), a top view of the master cylinder reservoir assembly is depicted. Figure 3(b), a sectional view of an oil level window of the master cylinder reservoir assembly is depicted. For the sake of brevity Figure 3(a) and Figure 3(b) are described together. The window (116) along with the O-ring (206) is fitted in the cavity (204) and the fastening clip (208) securely locks the window (116) inside the cavity (204) as emphasized in section A’. The window (116) includes a bulge (302) on an outer surface acts as a minimum level mark for the brake oil. The bulge (302) facilitate the user to determine the level of the brake oil and enable the user to check that the brake oil is always above the minimum level.
Therefore, the present invention provides the master cylinder reservoir which include a window formed in one of a lateral side wall so that the level of liquid in the master cylinder reservoir can be visually determined. The present invention provide a secure, durable and reliable attachment of the oil level window to the reservoir, preventing dislodgement under pressure while maintaining clear visibility of the brake fluid level. The present invention provides a bulge on the window to facilitate the user to determine the level of the brake oil and enable the user to check that the brake oil is always above the minimum level.
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 master cylinder reservoir assembly (100) comprising:
a brake fluid reservoir (102) having a plurality of side walls;
at least one of a lateral side wall (202) from the plurality of side walls include a cavity (204) to incorporate a window (116), wherein the cavity (204) includes a circular groove to hold the window (116);
an O-ring (206) incorporated on an outer circumference of the window (116), wherein the O-ring (206) prevents the brake oil leakage from the reservoir (102) as the O-ring remain compressed between inner diameter of circular groove of the cavity (204) and outer diameter of window (116);
a fastening clip (208) is fastened to securely lock the window (116) along with the O-ring (206) inside the cavity (204), wherein the fastening clip (208) facilitate that the window (116) to lock inside the cavity (204) and prevents popping out during pressurized filling of brake oil in the reservoir (102);
a bulge (302) provided on an outer surface of the window (116) which act a minimum level mark for the determination of the brake oil level.
2. The master cylinder reservoir assembly (100) as claimed in claim 1, wherein the master cylinder reservoir assembly (100) includes a projection body (106) having a rearward projected mounting seat portion (118).
3. The master cylinder reservoir assembly (100) as claimed in claim 1, wherein the mounting seat portion (118) conjoint with a holder (104) to form a through hole in which a mounting portion of a steering bar of a vehicle is sandwiched.
4. The master cylinder reservoir assembly (100) as claimed in claim 1, wherein the holder (104) and the mounting seat portion (118) are connected by the at least two fastening member (108) upon conjoining.
5. The master cylinder reservoir assembly (100) as claimed in claim 1, wherein the projection body (106) include a brake lever (110) mounted by a support member (112).
6. The master cylinder reservoir assembly (100) as claimed in claim 1, wherein the brake fluid reservoir (102) is secured by a lid (114).
7. The master cylinder reservoir assembly (100) as claimed in claim 1, wherein the O-ring (206) is made of a rubber or any other similar material.
8. The master cylinder reservoir assembly (100) as claimed in claim 1, wherein the fastening clip (208) includes a C-clip, a circlip, a snap ring, or any similar fastening mechanism.

Dated this on 25th day of July, 2025