FORM 2
THE PATENTS ACT, 1970
COMPLETE SPECIFICATION (See Section 10)
TITLE OF INVENTION
AN EXTERNALLY MOUNTED INDEPENDENTLY ACTUATED
TRANSMISSION BRAKING SYSTEM FOR THE
POWER TILLER
APPLICANTS
KIRLOSKAR OIL ENGINES LIMITED.
Laxmanrao Kirloskar Road, Khadki,
Pune - 411003, Maharashtra, India
INVENTORS
Mr. Pramod R. Ekbote, Mr. Anil A. Joshi, Mr. Narayan R. Danavade and Mr. Rupesh K. Redkar
all Indian National
OF
KIRLOSKAR OIL ENGINES LIMITED.
An Indian Company at
Laxmanrao Kirloskar Road, Khadki,
Pune - 411003, Maharashtra, India
PREAMBLE OF THE INVENTION
The following specification particularly describes the nature of this invention and the
manner in which it is performed.

FIELD OF INVENTION:
This invention relates to an externally mounted, independently actuated, transmission braking system on power tiller and the method of manufacturing the same. More specifically the invention relates to externally mounted, independently actuated, transmission braking system on a power tiller.
BACKGROUND AND PRIOR ART:
Conventionally, Power tillers are amongst important farm machinery. With power tiller famer can prepare the land & carryout different applications as per need. This is a light weight machine as compared to a conventional four wheeled tractors, hence more suitable for light load farming applications. Currently, power tillers are being used in dry & wet land farming. Typically in dry land the usage is concentrated around post seeding operations like de-weeding, earthing up & secondary tillage applications.
In wet land farming the power tillers are primarily being used for preparation of field before rice transplantation. During usage in the field, the user/operator walks behind this machine.
Power tillers are used for different farming applications. Controlling the power tiller during critical situation such as bund crossing, going uphill or downhill, precision navigation & stoppage is difficult. Hence there is a need to develop a power tiller with a braking system that will enable power tiller user to control & stop the machine in such critical situations.
Need for this innovation:
Currently, the power tiller are provided with ring brakes which are actuated by operating the clutch lever. Which is potentially unsafe situation as the machine is completely de-clutched & then brakes are applied. Hence, there is a possibility of operator losing control on the machine before the brakes are applied. Conventional power tillers have very smaller sized brakes with metallic friction surface, these brakes can be actuated only after clutch disengagement thereby leading to powerloss in the running condition. Also, this puts limitation on the use of the machine in many circumstances such as going uphill, downhill or while crossing the bund in the field. In such a case if the operator looses the control over the power tiller during uphill while applying the brakes in the conventional power tillers then

there is possibility that whole of the power tiller may run over the operator and can cause severe damage to the operator. Similarly, during downhill if the operator looses the control over the power tiller then there are chances of the power tiller running down the slope and cause damage to the persons/objects coming in its way in addition to it’s self damage which will not be advisable in either case.
OBJECTS OF INVENTION
An object of the present invention is to develop a power tiller which will allow the controlling the power tiller during critical situation such as bund crossing, going uphill or downhill, precision, navigation & stoppage.
Another object of the invention is to develop a power tiller with a braking system that will enable power tiller user to control & stop the machine in such critical situations.
Yet another object of the present invention is to develop a transmission braking system for a power tiller.
STATEMENT OF THE INVENTION:
An externally mounted independently actuated transmission braking system for the power tiller comprising an actuation mechanism consisting of a lever (17) situated on the handle (16), a brake tube (19) is connected to a actuating chamber (20) on one side & slave cylinder (18) on the other side; a braking mechanism consisting of brake drum (02) mounted on the main shaft (1) of the transmission (21); at least one brake assembly (8) connected to this brake drum (2); at least one slave cylinder is mounted on the brake assembly (8) for pressurising the brake fluid pressure from the tube end (18) for application of the braking force on the machine; at least one parking brake assembly; plurality of wheels mounted on main shaft (1); and a sheet metal cover (12) for brake assembly.
The brake tube (19) is provided to be connected to a flexible end connector to accommodate the routing & connections. The parking brake assembly consists of a intermediate driving gear (22), brake Ring (23), brake Shaft (24), control rod (25) and lever clutch / brake (26).

The braking system and its actuation mechanism is provided on RH side of the power tiller. The main drive shaft (1), retainer brake drum (3), brake assembly (8), brake drum (2) and for brake drum cover (9) are provided on the RH side of the transmission assembly (21) of the power tiller.
The brake drum (2) is a cast iron brake drum for dissipation of the heat generated during braking. The brake cover (9) is provided to support the whole brake assembly (8) and to transfer the torque and to offer braking resistance on to the transmission assembly (21). The lever (17) situated on the handle (16) is provided to actuate transmission braking
BRIEF DESCRIPTION OF THE INVENTION:
The present invention discloses the power tiller. Power tillers are used for different farming applications. Controlling the power tiller during critical situation such as bund crossing, going uphill or downhill, precision navigation & stoppage is difficult. The claimed invention of the braking system enables power tiller user to control & stop the machine in such critical situations. During usage of the power tiller in the field, the user/operator rides on this machine or power tiller. In some cases this is also used for transporting agricultural goods.
Attached fig. 2 shows a typical use in the rice land preparation with Mega T power tiller. The invention of transmission brakes removes this possibility of user losing control on account of de-clutching. The invention enables user to apply brakes as per situation independently.
BRIEF DESCRIPTION OF THE DRAWINGS:
According to the present invention;
Figure 1 shows Schematic diagram showing transmission braking system on the Power tiller
Figure 2 shows a typical view of paddy field preparation using Power tiller.
Figure 3 shows a typical power tiller condition while going uphill or climbing the bund.
Figure 4 shows typical power tiller condition while going downhill or descending the bund.
Figure 5 shows Schematic diagram showing brake actuating lever
Figure 6 shows Cross Section of transmission at main shaft showing brakes assembly
Figure 7 shows the detailed layout arrangement of the transmission braking system on the
Power tiller.

DETAILED DESCRIPTION OF THE INVENTION:
The present invention discloses a typical power tiller used in the field for land preparation. This invention of transmission brakes removes the possibility of user losing control on account of de-clutching. The invention enables user to apply brakes as per the situation and independently.
The Power tiller has the braking system (consisting of 02,08,09,17,18,19,20 ) mounted on its transmission (21). This system consists of internal expanding brake shoe (not shown) with proper friction material lining. This system is actuated in a close hydraulic circuit by a hand lever (17). The braking surface is much Larger as compared to the conventional power tillers; hence the braking is effective in conditions depicted above. Since the actuation is hydraulic, the effort required by the user is minimal.
Moreover, the user need not disengage the clutch for operating the brake unlike conventional system; hence he can retain better control on the machine. In addition to this new braking system, the design also has the conventional metallic ring braking system consist of intermediate driving gear (22), brake Ring (23), brake Shaft (24), control rod (25), lever clutch / brake (26), which acts as parking brake.
Actuation Mechanism:-The transmission brake is actuated by the operator using the lever (17) situated on the handle (16) (fig 5). The actuation increases brake fluid pressure in the brake tube (19). The brake tube (19) is connected to actuating chamber (20) on one side & slave cylinder (18) on the other side. The brake tube (19) is connected by a flexible end connector to accommodate the routing & connections.
Braking Mechanism:-The general cross section of the main shaft (01) & the brakes assembly (08) is as shown in the fig. 6.
The brake drum (02) (fig. 7, 2) is mounted on the main drive shaft (1) of the transmission (21); the wheels are connected to main drive shaft (1). Rotation resistance if provided on this

shaft (1) can be directly transferred to the rotation of the wheels. The resistance is connected to this brake drum ( 2) by the internal expanding shoes (x) on the brake assembly (8) (Fig). The slave cylinder is mounted on the brake assembly (8) (Fig7, 7); this receives the increased brake fluid pressure from the tube end (18) & expands the brake shoes inside brake assembly (8). The brake shoes expands inside the brake drum (02) offering rotational resistance. This rotation resistance acts as the braking force on the machine.
Technical details & layout of the innovation:
The detailed layout arrangement is shown in the figure – 7. The braking system consists of brake assembly (8), brake drum (2) & cover for brake drum (9) is mounted on RH side of the power tiller. The actuation of the system is also mounted on the RH side of the power tiller. The system consists of specially designed main shaft (1) which also acts as brake shaft, a special retainer brake drum (3) arrangement is provided on RH side of the transmission assembly (21). Specially designed cast iron brake drum (2) for dissipation of the heat generated during braking. Cover for Brake cover (9) supports the whole Brake assembly (8) & transfers the torque & offer braking resistance on to the transmission assembly (21). A Specially designed sheet metal cover (12) protects the assembly entry of foreign material.
Arrangement details: -
The brake drum (2) is mounted on the main shaft (1) of the transmission. The main shaft is designed in such a way that it can be taken out of the transmission on RH side of the machine to facilitate the brake drum (2) & cover for brake drum (2). The brake assembly (8) with liner is shown in the figure 7. The actuation is with a closed type of hydraulic circuit. The master cylinder assembly (17) is suitably mounted on handle bar (16) & can be operated with a very minimal actuating force.
Advantages to the user:
The system offers adequate and on-demand braking effect to the user. With the safety of this braking system, the machine’s utility & control is enhanced. The user will feel safer to operate the machine in-field conditions as described above.
Since, there is not pre-condition to apply clutch before commencing brake application in new system, the whole machine becomes safer to operate.

Part List
Part No. Item Description
1 main drive shaft
2 brake drum
3 retainer, brake drum
4 spring washer
5 allen screw
6 spring washer
7 ste screw
8 brake assembly
9 cover for brake drum

10 spring washer
11 ste screw
12 brake drum cover lower
13 set screw
14 plain punched washer
15 hex nut
16 handle bar
17 master cylinder assembly
18 brake hose master assembly
19 brake tube
20 brake hose panel assembly
21 transmission assembly
22 intermediate driving gear
23 brake ring
24 brake shaft
25 control rod
26 lever clutch/ brake
In the foregoing description, example embodiments are to be regarded in an illustrative rather than in a restrictive sense. It will, however, be evident that various modifications and changes may be made thereto, without departing from the broader spirit and scope of the present invention.

Although example embodiments have been described herein, many additional modifications and variations would be apparent to those skilled in the art. It is therefore to be understood that this Invention may be practiced otherwise than as specifically described. Thus, the present example embodiments should be considered in all respects as illustrative and not restrictive.

We claim:
1. An externally mounted independently actuated transmission braking system for the
power tiller comprising
an actuation mechanism consisting of a lever (17) situated on the handle (16), a brake tube (19) is connected to a actuating chamber (20) on one side & slave cylinder (18) on the other side;
a braking mechanism consisting of brake drum (02) mounted on the main shaft (1) of the transmission (21);
at least one brake assembly (8) connected to this brake drum (2);
at least one slave cylinder is mounted on the brake assembly (8) for pressurising the brake fluid pressure from the tube end (18) for application of the braking force on the machine;
at least one parking brake assembly;
plurality of wheels mounted on main shaft (1); and
a sheet metal cover (12) for brake assembly.
2. The transmission braking system for the power tiller as claimed in claim 1, wherein said brake tube (19) is provided to be connected to a flexible end connector to accommodate the routing & connections.
3. The transmission braking system for the power tiller as claimed in claim 1, wherein said parking brake assembly consists of a intermediate driving gear (22), brake Ring (23), brake Shaft (24), control rod (25) and lever clutch / brake (26).
4. The transmission braking system for the power tiller as claimed in claim 1, wherein said braking system and its actuation mechanism is provided on RH side of the power tiller.
5. The transmission braking system for the power tiller as claimed in claim 1, wherein said main drive shaft (1), retainer brake drum (3), brake assembly (8), brake drum (2) and for brake drum cover (9) are provided on the RH side of the transmission assembly (21) of the power tiller.

6. The transmission braking system for the power tiller as claimed in claim 1, wherein said brake drum (2) is a cast iron brake drum for dissipation of the heat generated during braking.
7. The transmission braking system for the power tiller as claimed in claim 1, wherein said brake cover (9) is provided to support the whole brake assembly (8) and to transfer the torque and to offer braking resistance on to the transmission assembly (21).
8. The transmission braking system for the power tiller as claimed in claim 1, wherein said lever (17) situated on the handle (16) is provided to actuate transmission braking by the operator.