JPH083737Y2 - Power transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a power transmission device used in a vehicle and having a function of detecting a diff lock state.

(Prior Art) Japanese Utility Model Laid-Open No. 59-170022 discloses a "differential lock display device. This device has a differential device, a differential lock mechanism thereof, and an air cylinder device for operating the differential lock mechanism. This air cylinder device is housed in a casing that is mounted so as to project above the axle tube, and a push-in switch is attached to this casing. This switch is pressed by a fork that locks the differential lock mechanism by the air cylinder device. To operate and generate a lock signal.

Thus, in addition to the switch for detecting the differential lock state being arranged on the axle tube side, there is a switch for arranging the switch on the side of the differential carrier for accommodating the differential device as shown in FIG.

(Problems to be solved by the invention) However, in the one described in the above publication, since the diff lock mechanism and the air cylinder device are arranged on the axle tube side, an axle tube common to a vehicle having no diff lock mechanism is provided. The air cylinder device cannot be used, and the air cylinder device is provided so as to project from the axle tube, which causes a disadvantage in the vehicle layout. Further, in the example of FIG. 3, the actuator 2 that operates the diff lock mechanism 201
The lock direction of 03 is the left side of the figure, and the pushing direction of the switch 205 is the right side of the figure.
To activate 205, lever 2 reverses lock action
07 and fulcrum axis 209 are required. Moreover, in order to avoid interference with the drive pinion gear 211, the lever 207 must be arranged above or below the pinion gear 211 with a large offset. Due to this and the length of the lever 207, one end of the lever 207 projects outward from the differential carrier 213, and a holder 215 for supporting the switch 205 and the shaft 209 and attaching them to the differential carrier 213 is also required. As described above, the operating mechanism of the switch 205 is not compact because the structure is complicated, the number of parts is large, and the lever 207 and the holder 215 are bulky.

Therefore, an object of the present invention is to provide a power transmission device having a diff-lock state detection mechanism which is simple in construction and has a small number of parts.

[Structure of the Invention] (Means for Solving the Problems) A power transmission device of the present invention is a differential device having a differential lock mechanism provided in a differential case rotatably supported by a differential carrier, the differential case and the differential carrier. An actuator arranged between the two to operate the diff lock mechanism, an operation member which moves inward of the diff case in accordance with the operation of the diff lock mechanism in conjunction with the operation of the actuator, and a main body installed on the diff carrier near the operation member And a pull-out switch that has a rod that is engaged with the operating member and slides in a direction in which the differential lock mechanism is pulled out from the main body when the diff-lock mechanism is operated, and that generates a lock signal when the rod slides. It is a thing.

(Operation) When the diff lock mechanism is activated by the actuator,
The switch is pulled out by an operation member that is interlocked with the lock operation, and a lock signal for lighting a lamp or the like indicating the locked state is generated.

Since the switch is of the pull-out type, the diff lock mechanism and the switch operate in the same direction, so the lever and its supporting members as in the conventional example are not required, and the number of parts of the switch operation mechanism is reduced and the structure is simple. It becomes compact.

(Embodiment) An embodiment will be described with reference to FIGS. 1 and 2.

FIG. 2 shows a power system of a vehicle using this embodiment. Hereinafter, the left-right direction of the vehicle is the left-right direction in these drawings, and the upper side of FIG. 1 corresponds to the front side of the vehicle (upper side of FIG. 2). It has not been.

First, the power system of this vehicle will be described with reference to FIG. The power system of this vehicle is engine 1, transmission 3,
Propeller shaft 7, rear differential 9 (power transmission device of this embodiment used on the rear wheel side), rear wheel shafts 11, 13, left and right rear wheels 15,
It consists of 17, the left and right front wheels 19, 21 and so on.

As shown in Fig. 1, the differential case 23 of the rear differential is a bearing.
25 and 27 are rotatably supported inside the differential carrier 29. A ring gear 31 is fixed to the differential case 23 with bolts 33, and this gear 31 meshes with a drive pinion gear 35. The gear 35 is integrally formed at the rear end of the drive pinion shaft 37 connected to the propeller shaft 7 side, and the shaft 37 is supported by the differential carrier 29 by bearings 39 and 41. Then, the differential case 23 is rotationally driven by the driving force from the engine 1.

A groove 43 in the axial direction is provided on the inner circumference of the differential case 23, and pressure rings 45, 47 are engaged in the groove 43 with convex portions 49, 51 respectively provided in the axial direction so as to be movable in the axial direction. Is integrally rotatably connected with.

An end of the pinion shaft 53 is movably supported between the rings 45 and 47. The ends of the shaft 53 and the facing surfaces of the rings 45, 47 receive torque on the rings 45, 47.
Cam part 55 which gives left and right thrust force to 47 respectively
Are formed.

A pinion gear 57 is rotatably supported on the pinion shaft 53. Left and right side gears 59 and 61 mesh with the gear 57.

In this way, the differential device 63 is configured. The side gears 59 and 61 are spline-connected to the left and right rear axles 11 and 13, respectively.

When the differential case 23 is rotated by the driving force from the engine 1, this rotation is changed from the pressure rings 45 and 47 to the cam portion 55.
Through the pinion shaft 53, the pinion gear 57, and the side gears 59, 61 to the left and right rear wheels 15, 17 for split output.

Outer and inner friction plates 65 and 67 are alternately arranged between the differential case 23 and the side gears 59 and 61, respectively.
The outer friction plate 65 is spline-engaged with the inner periphery of the differential case 23, and the inner friction plate 67 is spline-engaged with the outer periphery of the gears 59, 61. Thus, the left multi-plate clutch 69 and the right multi-plate clutch 71 are configured. In the right clutch 71, the ring 73 spline-engaged with the side gear 61 is a friction plate.
It is located to the right of 65,67.

These multi-disc clutches 69, 71 are pressure rings 45,
It is pressed by the cam thrust force transmitted via 47. In this way, when the clutches 69 and 71 are in the engaged state, the differential device 63 is differentially limited according to the engaging force. The thrust washers 75, 75 arranged between the side gears 59, 61 and the differential case 23 are used to drive the pinion gear 5
The mesh thrust force of the gears 59 and 61 due to the mesh with 7 does not act on the multi-plate clutches 69 and 71.

The right side wall 77 of the differential case 23 has a circumferential groove provided on the inner surface side.
79, a peripheral groove 79, and a through hole 81 that communicates with the outside of the differential case are provided. A clutch ring 83 is arranged in the circumferential groove 79 and the through hole 81 so as to be movable in the axial direction. A cam portion 85 is provided between the through hole 81 and the ring 83 to generate a thrust force for receiving the torque and moving the ring 83 to the left.

Left side of clutch ring 83 and ring of multi-plate clutch 71
A dog clutch 87 having a pressure angle is formed on the right side surface of 73 (differential lock mechanism). The dog clutch 87 is in an engaged state when the ring 83 moves to the left, and is in an open state when it moves to the right as shown in FIG. A return spring 89 that urges the ring 83 toward the open side is arranged between the ring 73 and the ring 83.

The dog clutch 87 meshes and the differential device 63
When the differential is about to be generated between the differential case 23 and the side gear 61 when is locked, torque is applied to the cam portion 85, and the cam thrust force causes the dog clutch 87 to be more firmly engaged and the ring 73 is prevented from coming off. When pressed to the left, the multi-plate clutches 71, 69 are firmly engaged, and the load applied to the dog clutch 87 is reduced.

A ring-shaped operating member 91 is arranged on the right side of the differential case 23. The protrusion 93 provided on the inner edge side of the operation member 91 is fixed to the clutch ring 83 by a bolt 95.

A ring-shaped actuator 97 is arranged between the operating member 91 and the differential carrier 29. The actuator 97 includes a diaphragm 99 and a holding member 103 to which the diaphragm 99 is airtightly attached and forms a pressure chamber 101 together with the diaphragm 99.
And a pressing member 105 fixed to the diaphragm 99 and the like. The holding member 103 is fixed to the differential carrier 29 by a bolt 107, and the pressing member 105 is an operating member 91.
And slidably abuts. Pressing member 10 by this sliding
The rotation of 5 is prevented by locking the pressing member 105 with the locking member 109 fixed to the holding member 103 in the rotation direction.

Pressure is supplied to the pressure chamber 101 of the actuator 97 from a pressure source such as an air pump via a control valve device. When pressure is supplied, the pressure chamber 101 expands and the diaphragm 99 bends, and the pressing member 105 slides the operating member 91 and presses it to the left to resist the urging force of the return spring 89 and engage the dog clutch 87. The matching differential device 63 is locked. The pressure supply is stopped by the control valve device, and the pressure chamber
When 101 is opened to the atmosphere, the clutch ring 83 is returned to the right by the urging force of the return spring 89 and the dog clutch 87 is released. Further, since the dog clutch 87 has a pressure angle, it can be released smoothly. In this way, the operating member 91 moves in the locking direction (leftward) and the unlocking direction (rightward) in conjunction with the locking operation of the differential device 63 by the actuator 97.

Such an operation of the actuator 97 by the control valve device can be manually operated from the driver's seat or can be automatically operated according to steering conditions and road surface conditions. In this way, the actuator 97 includes the differential case 23 and the differential carrier.
29 is arranged to operate a dog clutch 87 as a diff lock mechanism, and is linked to the operation of the actuator 97, and the operation member 91 is operated in accordance with the operation of the diff lock mechanism.
Is to move inward of the differential case 23.

The main body of the pull-out switch 11 is attached to the right side of the drive pinion gear 35 on the differential carrier 29 near the outer periphery of the operating member 91. The switch 111 has a rod 113 that slides in a direction in which it is pulled out from the main body when the diff lock mechanism is operated, a retaining ring 115 attached to the rod 113, and a rotary plate 117 rotatably attached to the right side thereof. An outer edge portion of the operation member 91 bent to the right can come into contact with the right side surface of the rotary plate 117.

Therefore, the switch 111 is moved to the left in conjunction with the locking operation of the actuator 97 when the differential device 63 is locked by the operating member 91 and the rod 1 via the rotary plate 117.
13 is pulled out and a lock signal is generated. With this lock signal, a lamp indicating that the rear differential 9 is in the locked state is turned on in the driver's seat. Operation member 91 for unlocking
When is moved in the unlocking direction (to the right), the switch 113 causes the rod 113 to return to the right by the built-in spring, the lock signal is cut off, and the above lamp goes out. The rotation of the operating member 91 that rotates integrally with the differential case 23 is blocked by the rotation of the rotating plate 117 and is not transmitted to the rod 113.

The function of the rear differential 9 configured as described above will be briefly described according to the power performance of the vehicle shown in FIG.

No pressure supplied to actuator 97 Dog clutch
When 87 is open, the differential limiting force of the multi-plate clutches 69 and 71 due to the cam thrust force of the cam portion 55 drives the other of the rear wheels 15 and 17 to the other even when one of the rear wheels 15 and 17 is idling on a bad road. Power is sent and you can continue running. Further, the forward rotation of the outer wheel side during turning reduces the thrust force of the cam portion 55 and reduces the differential limiting force between the rear wheels 15 and 17, which enables smooth turning.

When the pressure is supplied to the actuator 97, the pressing force engages the dog clutch 87 to apply the cam thrust force of the cam portion 85 to more firmly engage the dog clutch 87 and the multiple disc clutches 71, 69. Therefore, the differential device 63 is locked, and the running performance on a rough road is further improved and the straight running stability is improved.

As described above, since the operating directions of the actuator 97 and the switch 111 are the same (leftward), the lever 20
A reverse rotation mechanism such as 7 is unnecessary, and the operation mechanism of the switch 111 can be made compact. Therefore, the rod 113 and the rotary plate 117 are connected to the drive pinion gear 35 and the differential carrier 2
The switch 111 can be arranged in a narrow gap between the switches 9 and 9 and the switch 111 can be directly attached to the differential carrier 29 without using the holder 215 of the conventional example. In this way, the operation mechanism of the switch 111 can be constructed compactly with a small number of parts and compact.

In the present invention, the differential device may be a differential device that includes a pair of multi-plate clutches that respectively connect the engine side and the left and right drive wheels, and a pair of actuators that respectively engage these clutches.

[Effect of the Invention] As described above, in the power transmission device of the present invention, the pull-out type switch is used to detect the locked state, and the operating direction and the locking direction of the differential lock mechanism are made to be the same. Since no additional members are needed, the switch operation mechanism is simple in construction, and the number of parts is small and the switch is compact.

[Brief description of drawings]

FIG. 1 is a sectional view of one embodiment, FIG. 2 is a skeleton mechanism diagram showing a power system of a vehicle using this embodiment, and FIG. 3 is a conventional sectional view. 23 ... Differential case, 29 ... Differential carrier 63 ... Differential device 69, 71 ... Multi-plate clutch 87 ... Dog clutch (differential lock mechanism) 91 ... Operating member, 97 ... Actuator 111 ... Pull-out switch

Claims (1)

[Scope of utility model registration request] 1. A differential device having a diff lock mechanism provided in a diff case rotatably supported by a diff carrier, an actuator arranged between the diff case and the diff carrier for operating the diff lock mechanism, and An operation member that moves inwardly of the diff case in association with the operation when the diff lock mechanism is operated, and a main body is installed on the diff carrier in the vicinity of the operation member, and engages with the operation member, and the main body is operated when the diff lock mechanism is operated. A power transmission device, comprising: a rod that slides in a direction in which the rod is pulled out, and a pull-out switch that generates a lock signal when the rod slides.