JPS5916589Y2 - Diff lock operating device - Google Patents

Description

[Detailed description of the invention] This invention is a differential lock operation for a differential lock device that selectively disables a differential device that provides a required rotational speed difference between left and right wheels when the machine is rotating, such as in agricultural tractors. It is related to the device.

This type of differential lock operating device is generally equipped with a differential lock pedal as an operating means, and when the differential lock pedal is depressed, the movable differential lock pawl is displaced and engaged with the fixed differential lock pawl, thereby achieving the desired differential locking action. .

When performing such a differential lock operation, if the differential lock pedal is forcibly depressed without the movable differential lock pawl and fixed differential lock pawl not being in the correct engagement position, the differential lock pawl may be damaged. It is difficult to accurately detect when the movable differential lock pawl reaches the starting position of engagement with the fixed differential lock pawl on the ring.
Forceful pedal depression as described above tends to occur.

Note that small agricultural transport vehicles and the like may be provided with a differential lock lever as an operating means in place of the differential lock pedal, but the situation is the same in this case as well.

Therefore, this invention is a differential lock operating device that eliminates the above-mentioned problems, and yet has a compact structure that is almost the same as conventional devices and is easy to assemble. The purpose of this project is to provide a differential lock operating device that can be used.

Regarding the illustrated embodiment, the configuration of the differential lock operating device according to the invention will be explained. In FIG. In addition to providing a bevel gear 3, a pair of drive bevel gears 5 are provided in the differential case 2 on a support shaft 4 supported by the case 2, and a pair of driven bevel gears 7 are provided on the left and right output shafts 6. Each is provided and configured.

In order to selectively deactivate this differential device 1, a fixed differential lock pawl 8 is attached to the differential case 2, and a fixed differential lock claw 8 is attached to the output shaft 6 on one side.
A movable differential lock pawl 1 is attached to a sliding metal fitting 9 fitted with a spline.
0 respectively, the sliding hardware 9 is slidably displaced on the output shaft 6, the movable differential lock pawl 10 is engaged with the fixed differential lock pawl 8, and the differential case 2 is selectively moved onto the one side output shaft 6.
A differential lock device 11 is configured which is coupled to the differential lock device 11 .

As an operating means for operating the differential lock device 11 or its movable differential lock pawl 10, a differential lock pedal 14 is provided which is rotatably supported around a fulcrum shaft 13 by a support plate 12 on the outer surface of the machine frame.

The pedal arm 14a of this stiff lock pedal 14 is connected to a fork shaft 1 which is slidably supported on the machine frame.
It is engaged with one end of 5 outside the machine frame.

A shift fork 16 is slidably supported on the fork shaft 15, and the shift fork 16 is connected to the inner surface of the machine frame and the shift fork with respect to an operating metal fitting 18 that is fitted onto the fork shaft 15 and connected to the pin 1f. Both ends are received by the fork shaft 16 and the fork shaft 15 is engaged by the biasing force of a return spring 19 provided on the fork shaft 15.

As described above, when the differential lock pedal 14 is depressed, the fork shaft 15 is pushed by the pedal arm 14 a against the biasing force of the return spring 19, and as a result, the fork shaft 15 is pushed into the operating metal fitting 18 on the fork shaft 15. When pushed, the shift fork 16 is displaced in the direction of arrow A in the figure.

When the locking pedal 14 is released, the return spring 19 returns it to the original position shown.

As shown in FIG. 1, a shift collar 20 is provided on the sliding hardware 9, and the shift fork 16 has its operating end facing an annular groove 20a formed in the shift collar 20. It is engaged with the shift collar 20 in the differential lock operating direction.

In particular, the shift collar 20 is slidably provided on the sliding hardware 9 and is not directly engaged with the sliding hardware 9 in the direction of operation of the lock.

Instead, an inward flange 20b is formed on the inner peripheral surface of the proximal end of the shift collar 20 whose retreat position on the sliding hardware 9 is regulated by a retaining ring 21 on the sliding hardware 9, and An outward flange 9a is formed on the outer circumferential surface of the tip of the moving hardware 9, and a spring 22 is provided with both ends received by the flange 20b, 9a.

Therefore, when the shift collar 20 located on the differential lock pedal 14 side in the differential lock operation path is displaced in the direction of arrow A in the figure, the spring 22 is pressed by the collar 20b of the shift collar 20 and compressed.
The sliding hardware 9 located on the side of the movable tee lock claw 10 is displaced and biased in the direction of arrow A.

The illustrated tension lock operation device is configured as described above, so that when the tension lock pedal 14 is depressed and operated, the shift collar 20 is displaced in the same direction by the displacement of the shift fork 16 in the direction of arrow A, and the spring 22 is compressed, and a force is applied to the sliding hardware 20 in the direction of arrow A.

The sliding hardware 20 is displaced in the direction of arrow A by this applied force, and this displacement causes both differential lock claws to open at 8°10.
When the gap α between them is filled, both differential lock claws 8
, 10 are not in the correct meshing position, only the shift collar 20 is displaced in the direction of arrow A by depressing the pedal 14, and the spring 22 is compressed to maintain the biasing force.

When the relative position between the differential lock pawls 8 and 10 reaches the correct meshing position due to the difference in rotational speed between the tough case 2 and the output shaft 6, the sliding hardware 9 is moved by the biasing force of the compressed spring 22. is further displaced in the direction of arrow A, and engagement between both the locking pawls 8 and 10 is achieved.

As described above, even if the differential lock pedal 14 is depressed deeply, the differential lock pawls 8 and 10 cannot be damaged.

As is clear from the above description, the differential lock operation device of this invention has a sliding metal fitting 9 which is spline-fitted to one output shaft 6 of the differential device 1 and forms the movable differential lock pawl 10.
An annular groove 2 on the top for engaging the shift fork 16
0 a, the shift collar 20 is
A retaining ring 21 attached to the sliding metal fitting 9 restricts the displacement in the direction opposite to the differential lock operation direction of the sliding metal fitting 9, and the sliding fitting 9 is provided with a collar protruding from the outer circumferential surface thereof. Both ends of the shift collar 20 are received by the portion 9a and the collar portion 20b protruding from the inner circumferential surface of the shift collar 20.
This structure is characterized by the provision of a spring 22 that is compressed when the slider e19 is displaced in the direction of operating the locking lock relative to the slider e19, and has the following advantages.

That is, since the differential lock operation device of this invention is constructed as described above, when the shift collar 20 is displaced in the differential lock operation direction by the shift fork 16, the sliding metal part 7 is moved in the desired differential lock operation direction via the spring 22. As well as being displaced, the sliding hardware 7
When the movable differential lock pawl 10 of the differential lock device is displaced until it collides with the fixed differential lock pawl of the differential lock device, if these differential lock pawls are not in the correct meshing position and the displacement of the sliding hardware 7 is regulated, only the shift collar 20 Since the spring 22 is displaced in the direction of differential lock operation and compressed, spring force is stored in the spring 22, so that the relative posture between the movable differential lock pawl and the fixed differential lock pawl reaches the correct meshing posture after the fact. At this point, the sliding ring *7 is displaced by the stored spring force so that the movable differential lock pawl engages with the fixed differential lock pawl, and the desired differential lock operation is obtained.

Therefore, in the differential lock operating device of this invention, even if the operating means such as the differential lock pedal is suddenly operated greatly, the differential lock pawl cannot be damaged, making it a highly safe differential lock operating device. It also has an excellent operating feel and is easy to operate.

Despite this, the teflock operating device of this invention is
The spring 22 that achieves the above-mentioned advantages is
Since it is provided between the sliding hardware 9 having the movable differential lock pawl 10 and the shift collar 20 slidably provided thereon, the installation of the spring 22 makes the differential lock operating device larger than the conventional one. For example, when such a spring is installed on the fork shaft that supports the shift fork, it does not cause problems such as lengthening the fork shaft or increasing the size of the transmission case. In particular, the sliding hardware 9 and the shift collar 20 and spring 22 thereon are designed so that the spring 22 and shift collar 20 are fitted onto the sliding hardware 9 from the opposite side of the flange 9a on the sliding hardware 9. Then, the retaining ring 21 is attached to the sliding metal fitting 9, and the structure can be assembled externally as one unit.The externally assembled item can be handled as a small and lightweight single item and made into a mission case. Since the device can be easily assembled into the device, it is easy to assemble, with almost no difficulty in assembling it, compared to conventional teflock operating devices.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of this invention. 1... Differential device, 2... Differential case,
6... Output shaft, 8... Fixed differential lock claw, 9... Sliding hardware, 10... Movable differential lock claw, 11... Differential lock device, 14
...Differential lock pedal, 15...Fork shaft, 16...Shift fork, 19
...Return spring, 20...Shift collar, 21...Retaining ring, 22...Spring.

Claims (1)

[Scope of utility model registration request] A shift collar 20 having an annular groove 20a for engaging a shift fork 16 is mounted on a sliding metal fitting 9 which is spline-fitted to one output shaft 6 of the differential device 1 and forms a movable differential lock pawl 10. The displacement of the shift collar 20 in the direction opposite to the locking operation direction is regulated by a retaining ring 21 attached to the sliding metal fitting 9, and the retaining ring 21 is provided so as to be slidable. The collar portion 9a and the collar portion 20 protruding from the inner circumferential surface of the shift collar 20
The differential lock operation device is characterized in that a spring 22 is provided at both ends thereof and is compressed when the shift collar 20 is displaced in the differential lock operation direction relative to the sliding hardware 9.