JPS60189678A - Mount structure for rear-wheel steering gear in vehicles - Google Patents

Abstract

PURPOSE:To check a steering variation in a rear wheel due to external force, by supporting an outer cylinder part bearing an input shaft directly on a rear beam, while mounting a lower arm on the said rear beam through a rubber material as well as mounting the rear beam on a car body in the same manner as using the rubber material. CONSTITUTION:A bearing holder assembling part 43 is installed in the central part of a rear beam 40, and mount rubber 50 is installed in both ends of the beam 40, while a bolt insertion hole 49 is installed in a spot rather little to the center. A bearing holder 14 of an input shaft 12 is assembled into the said assembling part 43 and coupled together with a bolt. In addition, the said insertion hole 49 is adjusted right with the insertion hole 49 of rubber mount 55 for a lower arm 35, inserting the bolt thereinto, and the lower arm 35 is attached to the beam 40. Likewise, the beam 40 is attached to a car body via the rubber mount 50 with the bolt. Therefore, when lateral force acts on a rear wheel, the rubber mount gets deformed but simultaneously with this, another rubber mount 50 is also deformed to same extent so that the arm 35 and the beam 40 both are laterally displaced as much as the same extent with the car body, whereby the rear wheel is hard to be steered.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a mounting structure for a rear wheel steering device in a vehicle.

(Prior Art) Various front and rear wheel steering systems have been proposed in which both the front wheels and the rear wheels are steered by the steering operation of a steering wheel.One example is a system in which a front wheel steering system and a rear wheel steering system are linked via a linkage shaft. There is a rear wheel steering device in which a steering angle function generation mechanism for the rear wheels is provided between a rear wheel tie rod and a human power shaft of the rear wheel steering system that is connected to each other and rotates in conjunction with a steering wheel.

In order to reduce roto noise transmitted from the rear wheels to the vehicle body, the input shaft portion and the lower arm for the rear wheels are separately attached and supported on the Φ body side via rubber mounts.

However, when a lateral force is applied to the rear wheel, the difference in the displacement I peak in the lateral direction of the vehicle body between the mount part of the rear wheel lower arm and the mount part of the input shaft part causes the rear wheel to turn the steering wheel. You may be steered like this.

(Objective of the Invention) An object of the present invention is to further reduce the transmission of roto noise from the rear wheel lower arm to the vehicle body, and to provide a mounting portion of the rear wheel lower arm, especially when a lateral force is applied to the rear wheel. It is an object of the present invention to provide a mount structure for a rear wheel steering device in a 111 vehicle, which reduces the lateral displacement difference between the input shaft portion and the mount portion, and suppresses steering changes of the rear wheels due to external forces as much as possible.

(Structure of the Invention) In order to achieve the above object, the present invention provides a rear wheel steering angle generating mechanism between an input shaft of a rear wheel steering system that rotates in conjunction with a steering wheel and a rear wheel tie rod. In a vehicle equipped with a rear wheel steering device, the outer cylinder portion that supports the human power shaft is directly supported on the rear beam without using a mounting rubber, a lower arm for the rear wheels is com-mounted on the rear beam, and the rear beam is mounted on the rear beam. It is characterized by a rubber mount on the vehicle body.

(Example) Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing a schematic structure of a seven-wheel steering system for front and rear wheels to which the present invention is applied, and FIG. 2 is an exploded sectional view of a steering angle function generator for the rear wheel steering system.

The handle shaft (2) of the handle (1) is built into a rank and pinion type gearbox (3), and the handle shaft (2) of the handle (1)
Tyrons F' (5) and (5) are connected to the left and right ends of
Front wheels (7), (7) are attached to the outer ends of the tie rods (5), (5).
) supporting the nuncle arms (e) and (8) are connected.

As is known, the front wheels (7), (7) are steered in the steering direction of the steering wheel (1).

A pinion shaft (8) is led out rearward from the gear box (3), and an r1IlX joint (8) is attached to the rear end of this shaft (8).
) is connected to a long linkage shaft (10), and the input shaft (12) of the rear wheel steering system is connected to the rear end of the linkage shaft (lO) through a universal joint j (II). . This human power shaft (12) is arranged on the left and right center line 1- of the rear of the heavy body, has an eccentric @ (13) at its rear end, is rotatably supported by a cylindrical bearing holder (14), and is rotatably supported by a cylindrical bearing holder (14). The halter (14) forming the main body is unrotatably supported on the φ integral side, as will be described later. A relatively small diameter flange (15) is formed at the front end of this holder (14), and a large diameter flange (+6) is formed at the rear end.

The internal ring gear (17) is attached to the flange (16) at the rear end of the bearing holter (14) with two wooden bolts (+8).
and the eccentric shaft (13), which is coupled at the Nand (19).
A cylindrical member (20) equipped with a pinion (21) at the front and a circular eccentric cam (22) at the rear is rotatably fitted on the top, and a joint member (23) is mounted on the eccentric cam (22).
) are rotatably fitted together. This joint member (23) has a plate (
27), the axial automatic movement is regulated by a nut (18) and a one-shaft (19) fastened to the rear end of the eccentric shaft (13), and the fourth part (25) is closed at the camp (30). .

And the left and right ends (2ft) of the joint member (23)
).

Rear wheel tie rods (32), (32) are connected to (26) via ball joints (31,), (31), and rear wheels (34) are connected to the outer ends of the tie rods (32), (32). (34
) supporting the nuncle arms (33) and (33) are connected. Naosu Nkuru Arm (33).

(33) has lower arm for rear wheel (35), (35)
are connected, and the lower arms (35) and (35) are supported by the vehicle body as described later.

In addition, the joint member (23) described in 1iii.
ll state is maintained.

The operation of such a front and rear wheel steering system will be briefly described.

In this case, for example, the eccentric shaft (13) is located in the vertical direction of the human-powered shaft (12), and the pinion (21) is located in the direction of the ring gear (12).
7), the cam top (22a) of the eccentric cam (22) is facing the vertical lower blade, and the pinion shaft (8) is aligned with the rank shaft (4) in the caponx (3). Initial setting is performed by engaging directly from both sides.

First, the human power axis (12) is linked to the steering operation of the handle (1).
), the eccentric shaft (13) rotates as a crank, and the pinion (21), which is fitted onto this and meshes with the stationary ring gear (17), rotates in the opposite direction.
2), the eccentric shaft (13), the pinion (21), and the eccentric cam (22) integrated with the cam top (22a) move in the opposite direction in the left-right direction, so the difference in resultant displacement is small. , Therefore, since the maximum horizontal displacement 1 of the joint member (23) loosely fitted to the eccentric cam (22) is small, the tyrons l" (3, 2'), (32) li-
the rear wheels (34), the front wheels (7) of (34), which are steered through the
The maximum steering angle in the same direction as (?) becomes smaller.

When the revolution angle of the pinion (21) exceeds a predetermined angle, the eccentric shaft (13) and the eccentric cam (
22) and the cam top (22a) in the left-right direction, the sum of the combined displacements becomes large with the opposite signs, and the maximum left-right displacement of the joint member (23) is Since it is large, the maximum steering angle of the rear wheels (34) and (34:) in the direction opposite to that of the front wheels (?) and (7) becomes large.

In the above, the bearing holder (14) and the rear wheel lower arms (35)', (35) are supported on the vehicle body side as shown in FIGS. 3 to 7.

First, there is a bearing holder assembly part (40) in the center of the rear beam (40), which has a channel shape that opens downward and is long in the vehicle width direction.
3), and mount rubber (50) (50) is provided at both ends.
A bolt insertion hole (4
9) and (49) are provided.

The bearing holder assembly part (43) is provided at an angle with respect to the beam (40) as shown in FIG.
The front piece (41) of 0) has an input shaft insertion hole (44) smaller in diameter than the flange (15) at the front end of the holder (14), and the rear piece (42) has a flange (16) at the rear end of the holder (14). ) and a larger diameter than the flange (+5).
45), and the peripheral edges (44a) and (45a) of both holes are inclined.

As shown in No. 514, the mount rubber (50) is made of a mold (53) between the inner and outer sleeves (51) and (52), and is used to attach the end of the beam (40). Hole (
47) The outer peripheral sleeve (52) is press-fitted into the sleeve (48) which is welded therein, and the mount parts 11 (50), (50) are provided at both ends of the beam (40).

On the other hand, mount rubbers (55), (55) are also provided at the inner ends of the rear wheel lower arms (35), (35).

The lower arm (35) has a channel type that can be opened toward the rear, and has a mounting hole (36) at its inner end as shown in Fig. 6.
A sleeve (37) is welded inside, and a mount rubber (55) is formed by baking rubber (58) between the inner and outer sleeves (56) and (57), and the outer sleeve (57) is attached to the sleeve (37). A mount rubber (55) is provided at the inner end of the lower arm (35).

In this way, the bearing holder (14) is installed from the rear into the installation part (43) at the center of the rear beam (40), and as shown in FIG.
a) and said bolt (18) and S-/l・(+9)
Combine at. A rubber ring (5θ) is installed between the flange (15) at the front end of the Holter and the periphery of the input shaft insertion hole (44a).
is interposed. Here, attach the bearing holder (14) to the beam (
Since the bearing holder (14) is bolted to the rear beam (40), the bearing holder (14) is fixed to the rear beam (40).

And the front and rear pieces (41), (42) of the rear beam (40)
With the inner end of the lower arm (35) facing inside, insert the inner sleeve (56) of the rubber mount (55) as shown in
) to the insertion hole (49) of the beam (40), insert the bolt (61) from the rear, and fasten the bolt (B2).

In this way, the steering angle function generator for the rear wheels 5 is supported on the rear beam (40) by the human power shaft (12), and the rear wheel lower arm (
35), (35) are also supported and sub-assembled, and the cross frame (70)
support.

That is, as shown in Fig. 5, both ends of the rear beam (40) are exposed between the front and rear brackets L-(71) and (72) hanging from the rear cross frame (70), and the bolts (63) are inserted into the brackets from behind. y (71), (72), insert into the inner peripheral sleeve (51) of the rubber mount (50),
Nando (7) welded to the Braken 1-(71)
3).

As shown in -1- below, the halter (14) of the human power shaft (12) of the rear wheel steering system is directly supported on the rear beam (40), and the rear wheel lower arms (B5) and (35) are also supported on the rear beam (40).
40), and the rear beam (40) was rubber mounted in the middle, so the rear wheels (34) and (34
), lower arm (35), (3
The com mount I (55), (55) of 5) will deform, and the rubber mounts (50), (50) of the rear beam (40) will also deform accordingly, so the lower arm (3) will also deform.
5) , (35) The trap beam (40) will be laterally displaced by approximately the same amount with respect to the +lj body.

Therefore, the bearing holter (14) and the lower I.
Since the positional relationship between the mounts (35) and (35) hardly changes, the difference in lateral displacement between the lower arms (35) and (35) and the human power shaft (12), that is, the steering angle function generator, is extremely small. , the rear wheels (34), (34) become difficult to steer.

Also, the lower arm (35) is mounted on its own mound) = ll, (
55) and rear beam (40) mount rubber (50)
Since it is mounted with a two-set rubber mount structure on the middle suspension, it is possible to further reduce road noise transmitted from the rear wheel (34) to the vehicle body via the lower arm (35).

By the way, in the embodiment, the bearing holder (14) was incorporated from the rear into the rear beam (40), but
) can be divided into upper and lower parts, the beam (
The bearing holder (14) can be assembled into the bearing holder (14) from below.

Also, rear wheel steering device, rear wheel lower arm (35), (35) and tie rod (3?), (3) are attached to the rear beam (40).
2) is assembled to the vehicle body as a subassembly, so the assembly work on the vehicle assembly line is easy and the assembly time can be shortened.

The steering angle function generator is not limited to the planetary gear mechanism as in the embodiment, but may be of a type in which a joint member is simply M-fitted to an eccentric shaft.

(Effects of the Invention) As described above, according to the mount structure of the rear wheel steering device according to the present invention, in particular, the outer cylinder portion that supports the input shaft of the rear wheel steering system can be directly mounted without using the mount rubber. While being supported by the rear beam, the lower arm for the rear wheel is rubber mounted to the rear beam, and the rear beam is further rubber mounted to the vehicle body, which increases the effect of reducing road noise transmitted to the vehicle body via the lower arm. Even if a force is applied, the difference in lateral displacement between the mount part of the rear wheel lower arm and the mount part of the input shaft part can be suppressed to a small level, so that changes in steering of the rear wheels due to external forces can be suppressed I can do it.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of a front and rear wheel steering device to which the present invention is applied, Fig. 2 is an exploded cross-sectional view of a steering angle function generator of a rear wheel steering system, and Fig. 3 is a perspective view showing a mount structure of the present invention. Figure, g:f
Figures S4 to FF16 are sectional views taken along lines IT-ff, v-v, and Vl-Vl in Figure 3, and Figure 7 is a cross-sectional plan view of the mount structure. In the drawing, (1) is the handle, (12) is the input shaft, and (13) is the handle.
) is an eccentric shaft, (14) is a bearing holder forming an outer cylinder, (23
) is the joint member, (32) is the rear wheel tie rod, (
34) is the rear wheel, (35) is the lower arm for the rear wheel, (40)
Harya beam, (50) and (55) are mount rubber,
(70) is the vehicle body frame. Patent applicant Honda Motor Co., Ltd. agent Patent attorney 2 [l Yong-Immediate question Patent attorney Kuni Ohashi Production volume Patent attorney Ko Goat (Figure 4)

Claims (1)

[Claims] In a vehicle equipped with a rear wheel steering system in which a rear wheel steering angle generating mechanism is provided between an input shaft of a rear wheel steering system that rotates in conjunction with a steering wheel and a rear wheel tie-ron, the input shaft is supported. 11 characterized in that the outer cylinder portion is supported on a rear beam, a lower arm for a rear wheel is rubber-mounted on the rear beam, and the rear beam is rubber-mounted on the vehicle body.
Mount structure for the rear wheel steering system in vehicles.