JPH04132819U - Vehicle parking brake device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a parking brake device that can increase the ground clearance of a four-wheel drive vehicle having a center differential and is not affected by the differential mechanism of the center differential. [Configuration] A parking brake that is disposed between the transmission and the center differential in the power transmission path and that locks the output shaft of the transmission, an operating device that is operated by the occupant to operate the parking brake, and a center differential lock that locks the center differential. and interlocking means for actuating the center differential locking means by operation of the operating device. The center differential is locked at the same time as the parking brake is activated.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a parking brake device for a four-wheel drive vehicle.

0002

[Conventional technology]

Conventionally, the parking brake of four-wheel drive vehicles with a center differential is controlled by the transmission. Behind the center differential in the power transmission path from the front to the center differential to the wheels It was located in

0003 FIG. 2 is a sectional view of a main part of a power transmission path of a conventional four-wheel drive vehicle. In Figure 2, 11 is a clutch, 12 is a transmission, and 13 is a transfer. Tiger A drive gear 15 is fixed to the output shaft 14 of the transmission transmission 12. The gear 15 drives the driven gear 18 of the center differential 17 via the idle gear 16. Ru. The center differential 17 includes a pinion shaft 19 attached to a driven gear 18, When the differential pinion 20 pivotally supported on the pinion shaft 19 meshes with the differential pinion 20, Both are attached to the front driven shaft 21 and the rear driven shaft 22, respectively. It includes a front differential side gear 23 and a rear differential side gear 24.

0004 The front driven shaft 21 and the rear driven shaft 22 are connected to a front wheel (not shown) and a rear driven shaft 22, respectively. and is operatively connected to the rear wheels to drive them.

[0005] 25 is a differential lock device, and a spline 26 formed on the driven gear 18 and a shift sleeve 2 that meshes with a spline 27 formed on the rear driven shaft 22. It has 8. The shift sleeve 28 is actuated via the shift fork 29. The shift sleeve 28 is driven in the axial direction by the motor 30, as shown in FIG. While it is possible to operate the center differential 17 when meshing only with the spline 27, the system When the foot sleeve 28 moves and engages both the spline 26 and the spline 27, Then lock the differential and drive gear 18, front driven shaft 21 and rear drive. The shaft 22 is rotated together.

[0006] The actuator 30 of the differential lock device 25 is activated by a predetermined differential lock signal a. The solenoid valve 31 is activated and compressed air is supplied from the air tank 32. It works. This differential lock signal a is used when driving on muddy ground, etc. Supplied by judgment.

[0007] Furthermore, a parking brake 33 is provided at the rear of the rear driven shaft 22. There is. The parking brake 33 is a parking brake fixed to the rear driven shaft 22. A brake drum 34 and a brake shoe 35 supported by a casing (not shown) The parking brake lever can be operated by operating the parking brake lever (not shown in Fig. 2). The rake shoe 35 locks the brake drum 34, and as a result, the rear driven shaft 22 is made unrotatable.

[0008]

[Problem that the idea aims to solve]

As mentioned above, when the parking brake 33 is arranged behind the center differential 17, , as shown in Fig. 3, the parking brake 33 is pulled downward due to the arrangement of parts. This had the disadvantage of lowering the ground clearance (h). In addition, in Fig. 3, 36 is Parkin. 37 is the parking cable, 38 is the engine, 39 is the front brake lever. 40 is the front wheel, 41 is the rear axle, 42 is the rear wheel, 43 is the propeller shaft. The shaft 44 is a universal joint.

[0009] In contrast, the parking brake 33 can be moved higher up, for example in the transmission position. If it can be attached to the output shaft 14 of the engine 12, the ground clearance h can be increased. However, if this happens, the front driven shaft will shift due to the differential mechanism of the center differential 17. 21 and the rear driven shaft 22 cannot be fixed. In this case, the front wheel Or, if one of the rear wheels spins on an icy slope, the vehicle may be moved. It moves.

0010 This invention was made in view of the above, and it is possible to increase the ground clearance of the vehicle. Provides a parking brake device that is not affected by the center differential differential mechanism. It is intended to.

[0011]

[Means to solve the problem]

The parking brake device for a vehicle according to the present invention to achieve the above-mentioned object is , a four-wheel drive system with a power transmission path from the transmission to the wheels via the center differential. In the wheel drive vehicle, the transmission and the sensor in the power transmission path A part is disposed between the differential gears and locks the output shaft of the transmission. - the parking brake, and the parking brake operated by the occupant. an operating device for locking the center differential; a center differential locking means for locking the center differential; interlocking means for actuating the center differential locking means by operation of an operating device; It is characterized by:

0012

[Effect]

When the occupant operates the control device, the parking brake automatically shuts down the transmission. At the same time, the center differential is locked via the interlocking device. As a result, rotation of the front and rear wheels is prevented.

[0013] On the other hand, the center differential can be placed relatively upward, increasing the vehicle's ground clearance.

[0014]

【Example】

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

[0015] FIG. 1 is a sectional view of the main part of the power transmission path of a four-wheel drive vehicle according to an embodiment of the present invention. Ru. In addition, this embodiment has a different arrangement position of the center differential compared to the conventional one described in FIG. The only difference is the interlocking device for the center differential lock, so Figure 1 shows the same parts as before. are given the same numbers as in FIG. 2, and duplicate explanations will be omitted as appropriate.

[0016] As shown in FIG. 1, the parking brake 51 is connected to the transmission 12. Transmission 1 in the power transmission path from the center differential to the wheels via the center differential 17 2 and the center differential 17. That is, the transmission 12 A sleeve 52 is fixed to the end of the output shaft 14, and a part is attached to this sleeve 52. The king brake drum 53 is fixed. Inside the parking brake drum 53 A brake shoe 54 supported by a casing (not shown) is provided. A lever 55 operatively connected to the parking lot 54 is connected to the parking cable 37 to - is connected to the king brake lever 36. This parking brake lever 36, the parking cable 37 is an operating device that operates the parking brake 51 The brake is activated by the driver operating the parking brake lever 36. The key shoe 54 locks the brake drum 53, and as a result, the transmission 12 The output shaft 14 of the output shaft 14 becomes unrotatable.

[0017] Furthermore, an electric switch 56 is disposed at the base of the parking brake lever 36. Ru. This electrical switch 56 controls the movement of the parking brake lever 36 and It constitutes an interlocking device that interlocks with the flocking device 25, and the parking brake It is turned on and off in conjunction with the movement of the rake lever 36. Parkin When the brake lever 36 is tilted down, that is, the brake is released. While the electric switch 56 remains off, the parking brake lever 3 6 is triggered, the base of the parking brake lever 36 activates the electric switch 56. Therefore, when the parking brake is activated, the electric The switch 56 is turned on.

[0018] This electric switch 56 is connected to the solenoid valve 31, and the on signal b is the solenoid valve 31. Activate valve 31. The differential lock device is released from the air tank 32 by the operation of the solenoid valve 31. Compressed air is supplied to the center differential 17, and the center differential 17 is differentially locked. Furthermore, figure In the differential lock device 25 of No. 1, the solid line indicates the non-operating state of the differential lock, and the broken line indicates the non-operating state of the differential lock. Each represents the operating state of the floc.

[0019] In such a configuration, in order to operate the parking brake 51, the occupant When the parking brake lever 36 is raised, the parking brake 51 is activated and the output shaft 14 of the transmission 12 is rendered unrotatable. Then, the electric switch 56 is turned on and the center differential 17 is differentially locked. the As a result, this differential lock causes the front driven shaft 21 and rear driven shaft 22 to By fixing the output shaft 14 of the transmission 12, both shafts 21 and 22 are both rendered unrotatable. Therefore, braking is applied to all four wheels, e.g. For example, even when only one wheel is on an ice burn, the wheel does not spin and the wheel is stopped. It is possible to hold the

[0020] On the other hand, the parking brake 51 is attached to the output shaft 14 of the transmission 12. By attaching it, the installation position is higher compared to conventional ones, and the ground of the vehicle is lowered. You can raise the height.

[0021]

[Effect of the idea]

As described above in detail with reference to one embodiment, according to the present invention, the parking brake Arrange the rake so that it locks the output shaft of the transmission, and Since the center differential is locked at the same time as the brake is activated, the center differential Not only does it provide reliable braking that is not affected by the differential mechanism, but it also reduces the ground clearance of the wheels. It has the effect of increasing the

[Brief explanation of drawings]

[Fig. 1] A cross-sectional view of the main parts of the power transmission path of a four-wheel drive vehicle according to an embodiment of the present invention.

[Fig. 2] Cross-sectional view of the main parts of the power transmission path of a conventional four-wheel drive vehicle

[Fig. 3] An explanatory diagram of the ground clearance of a conventional four-wheel drive vehicle

[Explanation of symbols]

12 is a transmission, 14 is an output shaft, 17 is a center differential, 25 is a differential lock device, 30 is an actuator, 31 is a solenoid valve, 32 is an air tank, 36 is a parking brake lever, 37 is a parking cable, 51 is a parking brake, 53 is a brake 54 is a brake shoe, 55 is a lever, and 56 is an electric switch.

Claims (2)

[Scope of utility model registration request] 1. In a four-wheel drive vehicle having a power transmission path from a transmission to the wheels via a center differential, the device is disposed between the transmission and the center differential in the power transmission path and locks the output shaft of the transmission. a parking brake that
The vehicle is characterized by comprising an operating device that is operated by an occupant to operate the parking brake, a center differential locking device that locks the center differential, and an interlocking device that operates the center differential locking device by operating the operating device. Vehicle parking brake device. 2. The operating device includes a parking brake lever operated by an occupant, and the interlocking device includes an electric switch that is turned on and off by movement of the parking brake lever. parking brake device for vehicles.