JPH0525352Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a steering device for a vehicle with front and rear wheel steering.

(Prior art and its problems) In vehicles, especially front and rear wheel steering vehicles, both the front and rear wheels can be steered, so there is no wheel that can be used as a reference when adjusting the suspension alignment of all four wheels. It took time to adjust the relationship between the toe amounts of the wheels and the relationship between the toe amounts of the right and left wheels.

(Means for Solving the Problem) In order to solve the problem, the present invention provides a front wheel steering device that is connected via a steering wheel and a steering shaft to steer the front wheels, and a front wheel steering device and a linkage shaft. A front and rear wheel steering vehicle comprising: a rear wheel steering device coupled via a rear wheel steering device for steering the rear wheels, wherein the rear wheel steering device includes a rear wheel steering gear box incorporating a rear wheel steering mechanism; The steering gear box for the rear wheels is provided with a guide hole that can be inserted from the outside to lock a locking means for regulating at least the rear wheels at the neutral steering position, and the steering gear box is inserted into the guide hole at the neutral steering position. The present invention is characterized in that the rear wheel steering mechanism is provided with an engaging portion that engages with the locking means.

(Function) In a front and rear wheel steered vehicle in which a rear wheel steering device is connected to a front wheel steering device via a linkage shaft, the device is inserted into the rear wheel steering gear box from the outside to regulate at least the rear wheels to a neutral steering position. In addition to providing a guide hole that can lock the locking means, the rear wheel steering mechanism is also provided with an engaging portion that engages with the locking means inserted into the guide hole at the neutral steering position. In addition, it is easy to neutralize and center the rear wheel steering mechanism during assembly work, and after adjusting the rear wheel toe, the front wheel toe adjustment can be performed using the rear wheels as a reference, similar to a normal front and rear wheel steering vehicle. The toe adjustment can be done easily and in a short time together with the spoke angle adjustment of the handlebar.

(Example) Examples will be described below based on the accompanying drawings.

Figure 1 is a schematic system diagram of the front and rear wheel steering device.
The steering shaft 2 of the handlebar 1 is connected to a pinion shaft 4 built into a rack and pinion type front wheel steering gear box 3, and the pinion shaft 4 meshes with both ends of a rack shaft 5, and a knuckle arm supporting the front wheels 6, 6. 7,7 means tie rod 8,8
are connected at. Furthermore, a pinion shaft 9 for taking out rotation to the rear wheel steering system is provided which meshes with the rack shaft 5.

On the other hand, knuckle arms 12, 12 supporting the rear wheels 11, 11 are connected to both ends of a joint shaft 14 via tie rods 13, 13, and the joint shaft 14 is incorporated into a steering gear box 15 for the rear wheels. A rotation input shaft 16 is incorporated into the gearbox 15, and an eccentric shaft 1 is attached to the rotation input shaft 16.
7 is provided, and an engaging portion 18 that engages with the eccentric shaft 17 and receives only left-right movement is connected to the joint shaft 14.
established in

The pinion shaft 9 for taking out rotation from the front wheel steering mechanism and the rotation input shaft 16 of the rear wheel steering mechanism are connected via a linkage shaft 19, and the four tie rods 8, 8, 13, 1
3 have toe adjustment screws 81, 81, 13, respectively.
1,131 are provided.

The details of the internal structure of the rear wheel steering gear box 15 are as shown in FIGS.
The cylindrical member 23 is rotatably fitted through the rollers 22 . A slide yoke 28 is fitted onto the eccentric cam 25 via balls 27 so as to be relatively rotatable. This slide yoke 28 has vertically tapered surfaces 2 on the left and right sides.
81, 281, each tapered surface 281, 281
and similar tapered surfaces 181, 181 provided on the engaging portion 18 fixed to the joint shaft 14, rollers 29... The rotation input shaft 16 is rotatably supported within the gearbox 15 via front and rear ball bearings 31, 31.
A distance collar 32 is interposed between the outer rings of each ball bearing 31, 31.

In the above, the flange 33 is formed on the outer periphery of the rear end of the rotational input shaft 16, and the engagement recess 34 as shown in FIG. do. A vertical guide hole 35 is formed through the lower surface of the gearbox 15 facing this recessed portion 34 which forms an engaging portion that engages with a locking means (locking device) to be described later in the neutral steering state.
A female thread 36 is formed at the lower open end of 5.

On the other hand, the locking device 41 is as shown in FIG.
It consists of a lock pin 42, a lever 43, a holder 44, a coil spring 45, and a plug 46, and the lock pin 42 is slidably assembled into the holder 44.
A flange 47 provided around the lock pin 42 in the holder 44 and a plug 48 screwed onto the open end of the holder 44
A coil spring 45 is compressed in between. As shown in FIG. 6, a pair of mounting pieces 49, 49 protruding from the open end of the holder 44, a lock pin 42, and an intermediate portion of the lever 43 are connected by a spring pin 51, and the outer periphery of the tip of the holder 44 is A male thread 52 is formed to be screwed into the female thread 36.

In order to attach such a lock device 41 to the rear wheel steering gear box 15, the gear box 1
5, insert the tip of the lock pin 42 into the guide hole 35 from below, rotate the lever 43, and screw the male thread 52 at the tip of the holder 44 into the female thread 36.

When the rotation input shaft 16 is adjusted to rotate and the engagement recess 34 of the flange 33 is located at the lowest position,
Due to the resilient force of the coil spring 45, the tip of the lock pin 42, which is in pressure contact with the outer peripheral surface of the flange 33, moves forward into the engagement recess 34, and the engagement between the recess 34 and the pin 42 causes the rotation input shaft 16 to be steered. Locked in neutral position. Therefore, the rear wheel steering mechanism is restricted to a neutral steering state.

Since the front wheel and rear wheel steering devices are mechanically connected, the front wheel steering mechanism can also be regulated to a neutral steering state at the same time during maintenance, and the toe adjustment of the front and rear wheels and the spoke angle adjustment of the steering wheel 1 can also be performed. It can be done easily in a short time.

Furthermore, on a vehicle assembly line, by adopting a similar lock structure for the front wheel steering mechanism, front and rear neutralization, centering, phasing, etc. can be facilitated.

Note that the structure of the locking means (locking device) is arbitrary, and the engaging portion may be a convex portion or the like.

(Effects of the invention) As described above, according to the invention, in a front and rear wheel steered vehicle in which a rear wheel steering device is connected to a front wheel steering device via a linkage shaft, the rear wheel steering mechanism can be locked in a neutral steering state. This makes it easy to neutralize and center the rear wheel steering mechanism during assembly work such as on the assembly line or during maintenance. Front wheel toe adjustment similar to that of a steered vehicle can be performed, and toe adjustment can be performed easily and in a short time together with steering wheel spoke angle adjustment.

[Brief explanation of the drawing]

Fig. 1 is a schematic system diagram showing an example of a front and rear wheel steering device, Fig. 2 is a cross-sectional view of the interior of the rear wheel steering gear box, Fig. 3 is a longitudinal sectional view of the same, and Fig. 4 is a line taken from Fig. 3. 5 is a longitudinal sectional view in the locked state, and FIG. 6 is a partial perspective view of the locking device. In addition, in the drawing, 1 is a steering wheel, 3 and 15 are steering gear boxes, 6 is a front wheel, 11 is a rear wheel, 1
6 is a rotation input shaft, 33 is a flange, 34 is an engaging portion, 35 is a guide hole, 41 is a lock device, 42 is a lock pin, 43 is a lever, 44 is a holder, 45
is a spring.

Claims (1)

[Claims for Utility Model Registration] A front wheel steering device that is connected via a steering wheel and a steering shaft to steer the front wheels, and a rear wheel steering device that is connected to the front wheel steering device via a linkage shaft to steer the rear wheels. A front and rear wheel steering vehicle comprising a steering device, wherein the rear wheel steering device includes a rear wheel steering gear box that houses a rear wheel steering mechanism, and the rear wheel steering gear box is inserted into the rear wheel steering gear box from the outside. a guide hole capable of locking at least a locking means for regulating the rear wheels at the neutral steering position, and an engaging portion that engages with the locking means inserted into the guide hole at the neutral steering position. A steering device for a vehicle with front and rear wheel steering, characterized by being provided in a mechanism.