JPS61178231A - Differential gear engaging operation device of vehicles for wasteland - Google Patents

Abstract

PURPOSE:To make a power transmission member settable in parallel with a propeller shaft as well as to simplify its structure ever so easy, by setting up a lock mechanism operating handle for a differential gear of vehicles for wastelant, while connecting this handle to the differential gear via the power transmission member. CONSTITUTION:A differential gear 4 is installed in the point midway in an axle 3 connecting a symmetrical pair of driving wheels 2a in the rear of a car body, and power out of an engine 5 is transmitted to symmetrical axles 3 via a propeller shaft 6a and the differential gear 4. This differential gear 4 consists of a ring gear 20 engaging a small bevel gear 17 at tan end part of the propeller shaft 6a two sets of bevel gears 23 and 24 being supported inside a differential gear case 21 unitized with the gear 20, and it is provided with a lock mechanism 25 consisting of a fixed clutch member 26 and a movable clutch member 27. At the abovementioned, the movable clutch member 27 is fitted in a support tube 27 being retractable via a shifter 30, while this shifter 30 is connected to an operating handle 10 set up at the sideway of the engine 6 via a flexible wire 31, an arm 32 and a rod 33.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a small vehicle for running on rough terrain, which is equipped with three or four low-pressure tires and has a rider-type seat between them. In particular, the present invention relates to a locking operation handle for a locking differential equipped with such vehicles.

[Conventional technology, problems to be solved]

Hitherto, rough terrain vehicles equipped with three or four low-pressure tires belong to the public domain. Because it turns by changing the ratio of the diameters of the inner and outer rings, it usually does not have a differential gear. On the other hand, some vehicles are equipped with a differential device to improve turning performance, but they have the problem of being unable to run if the drive wheels slip on muddy soil.

However, as a technique for solving this problem with the differential, there is a known technique in which the differential is equipped with a locking mechanism that stops its function. Although it has been proposed to install the steering wheel on the steering wheel (for example, Japanese Patent Application Laid-Open No. 59-20730), the area around the steering wheel tends to be complicated and the design is not easy.

[Purpose and outline of the invention]

The object of this invention is to obtain a locking operation device for a differential mechanism that does not have the above-mentioned problems and can be easily and reliably operated. A rough terrain vehicle having a rider-type seat disposed between the two driving wheels, and configured such that the two driving wheels are driven from an engine mounted below the seat via a differential device with a locking device, The locking mechanism operating knob of the differential gear is disposed on the side of the engine, and the operating knob and the differential gear are connected via a transmission member.

〔Example〕

This invention will be explained with reference to illustrated embodiments. In the figure, 1
is a four-wheeled vehicle for steering on rough terrain, and is equipped with low-pressure tires.
The vehicle has two wheels 2a and 2b, and a pair of left and right wheels 2 provided at the rear of the vehicle body serve as a drive wheel 2a connected by an axle 3. 4 is a differential device provided in the middle of the axle 3. A riding-type seat 5 is provided between the two driving wheels 2a, and an engine 6 is mounted on the lower front side of the seat 5.

6a is a propeller shaft that connects the engine 5 and the differential gear 4. Reference numeral 7 designates a steering handle for turning the two steering wheels 2b left and right, and an engine 4 is mounted on the right hand side of the steering handle.
An accelerator grip 7a is provided to adjust the output. 8 is a step attached to the left and right sides of the vehicle body on which the occupant's feet are placed, 9 is a gear shift pedal, and 10 is an operating handle for operating a locking mechanism 25 of the differential device 4, which will be described later. It is swingably locked to a pivot provided in the case.

As shown in FIG. 3, the differential device 4
It is housed in a case 16 sandwiched between the two. A hypoid-shaped small bevel gear 17 provided at the end of the propeller shaft 6a meshes with a ring gear 20 supported by a ball bearing 18 and a needle bearing 19.
A differential gear case 21 is fixed with bolts, and the differential gear case 21 has two bevel gears 23 loosely fitted on a support shaft 22 and two bevel gears 23 spline-fitted to the left and right axles 3, as is conventionally known. It consists of a gear 24 and functions in substantially the same way as the conventional one.

The locking mechanism 25 of the differential device 4 is non-rotatably supported on one side of the axle 3 and a mesh-type first clutch member 26 bolted to the other side of the ring gear 20 . The second part is provided so that it can be moved forward and backward and engaged and detached.
A clutch member 27 is included. That is, the second clutch member 27 is connected to the support cylinder 2 spline-fitted to one side of the axle 3.
It is spline-fitted onto B so that it can only slide freely, and is biased toward the first clutch member 26 by a spring 29 at the rear.

The support tube 28 is moved between a forward position and a retracted position by the actuation handle 10. That is, the support cylinder 28 is engaged with the shifter 30, and the flexible wire 31 serving as a conductive member is engaged with the shifter 30.
, move back and forth via a rod 33 that moves back and forth with an arm 32. Reference numeral 34 denotes a known moderation mechanism, which temporarily locks the chic 30 in the forward position and the backward position.

According to this embodiment, to unlock the differential mechanism and drive the vehicle, the occupant releases the accelerator grip 7'IL and tilts the operating handle 10 located at the lower part □ backward. By this operation, the arm 32 rotates clockwise in FIG. 3, and the rod 33 moves to the left together with the support tube 2B, so that the second clutch member 27 is prevented from meshing with the first latch member 26. It will be canceled. Thus differential gear 4
becomes functional. □ When the vehicle travels on muddy ground, the function of the differential gear 4 is stopped. That is, when the operating knob 10 is tilted forward, the arm 32 rotates counterclockwise and the rod 33 moves to the right together with the support cylinder 28. At this time, the second clutch member 27 is allowed to move to the right, but if the phase with the first clutch member 26 does not match, the spring 29 is compressed and remains in that position, and then , when the phases match, it moves to the right by the elasticity of the spring 29 and engages with the first clutch member 26, forming a so-called detent mechanism. In this way, the relationship between the ring gear 20 and the axle becomes fixed, and the differential function stops.

〔Effect of the invention〕

As described above, in this invention, the locking mechanism operating handle of the differential is disposed on the side of the engine, and the operating handle and the differential are connected via a transmission member.
The conduction member is arranged parallel to the propeller shaft 6a, which has the effect of simplifying the configuration.

Note that if the actuation handle 10 is placed on the same side as the accelerator grip 7a, the accelerator grip 7a and the actuation handle 10 will be operated by the hands on the same side, so when operating the actuation handle 10, the accelerator grip 7a must be inactive. operation, and the engine output is at its lowest, so that the effect is that the parts constituting the locking mechanism 25 are not damaged by impact.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a four-wheeled vehicle for rough terrain steering, FIG. 2 is a plan view thereof, and FIG.
The figure is a sectional view of the differential device, which is the main part. 3... Axle, 4... Differential gear, 7a...
・Accelerator grip, 10... Operating handle, 20
...Ring gear, 25...Lock mechanism, 26...First clutch member, 27...Second clutch member, 28...Support cylinder, 29...Spring,
31...Flexible wire, 30...Shifter

Claims (4)

[Claims] (1) The vehicle has two drive wheels with low-pressure tires attached to the rear of the vehicle body and a rider-style seat placed between them, and a differential gear with a locking mechanism is connected to the engine mounted below the seat. In the rough terrain vehicle configured to drive the two drive wheels via a transmission member, a locking mechanism operating handle of the differential is disposed on the side of the engine, and the operating handle and the differential are connected via a transmission member. A differential locking operation device for a rough terrain vehicle that is connected to the (2) A differential locking operation device for a rough terrain vehicle according to claim 1, wherein the operating handle of the differential located on the side of the engine is rotatably supported on the engine itself. . (3) The differential device for a rough terrain vehicle according to claim 1, wherein the operating handle of the differential device located on the side of the engine is provided on the same side as the operator for controlling the output of the engine. Locking operation device. (4) The differential locking operation device for a rough terrain vehicle according to claim 1, wherein the conductive member connecting the operating handle and the differential is a flexible wire.