JPS59140178A - Linkage shaft in vehicle steering device - Google Patents

Abstract

PURPOSE:To prevent a linkage shaft from directly making contact with a front panel as the result of the deflection of said shaft by attaching a damper rubber to at least one part of the outer periphery of the linkage shaft making connection between a driven pinion shaft and the input shaft of a rear wheel steering system. CONSTITUTION:The shaft 27 of a driven pinion within a steering gear box 20 and the input shaft 36 of a rear wheel steering system are connected to each other with a long linkage shaft 32 via universal joints 31, 35. And, damper rubber 33 is attached to the outer periphery at the central portion of the linkage shaft 32 in its lengthwise direction by means of baking and bonding. This damper rubber 33 is provided with a projecting part 34, so that even if the central portion of the linkage shaft 32 is deflected, the linkage shaft 32 does not directly make contact with the floor panel due to the compressive strain of the projecting part 34 as the result of its contact with the floor panel.

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a steering system for a vehicle in which the rear wheels are steered together with the front wheels, and in particular, a linkage shaft that connects the front wheel steering system and the rear wheel steering system is devised. It is something.

The driven pinion meshes with the rank shaft of the rack and pinion type steering gear that constitutes the main part of the front wheel steering system.
The input shaft connected to the driven pinion via a linkage shaft receives the rotation necessary for steering the rear wheels, is loosely fitted and supported by an eccentric pin provided on the human power shaft of the rear wheel steering system, and is a tie rod for steering the left and right rear wheels. The eccentric pin of the joint part that connects and supports the wheels swings horizontally and vertically due to crank rotation, and the front and rear wheels are simultaneously linked so that the steering ratio of the front and rear wheels is changed in proportion to the steering angle. The present applicant has previously provided a steering device for a vehicle (Japanese Patent Application No. 57-93394, etc.) that steers the vehicle with the steering wheel.

It is also possible to turn the steering wheel in the opposite direction, which improves maneuverability while driving at high speeds, and also allows for a small turning radius by turning the steering angle to the left when making U-turns or maneuvering around parking lots. As a result, the vehicle's bendability is excellent.

The present applicant has also provided a device in which left and right rear wheel steering tie rods are commonly connected and supported directly by an eccentric pin without using a joint member.

By the way, a long linkage shaft is installed between the shaft of the driven pinion and the input shaft of the rear wheel steering system, and since this linkage shaft is located below the floor panel of the vehicle body, it is difficult for the vehicle to move. There is a risk that the linkage shaft may bend and come into contact with the floor panel during middle and dimensioning.The present invention was made in view of this point, and its purpose is to prevent the linkage shaft from directly contacting the floor panel even if it bends. To provide a linkage shaft in a vehicle steering device which is prevented from contacting each other.

In order to achieve this object, the gist of the present invention is to attach a damp rubber to at least a portion of the linkage shaft, for example, around the outer periphery of the maximum amplitude portion where the amount of deflection is large.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below along with the configuration of a front and rear wheel steering system for a vehicle. FIG. 1 is a perspective view showing a schematic configuration of the front and rear wheel steering system, FIG. 2 U is an exploded perspective view of main parts of the rear wheel steering system, and FIG. 3 is a sectional view of the main parts in an assembled state.

A pinion shaft 21 is connected to the lower HA of the handle shaft 2 of the steering wheel 1, which is a steering wheel, via a universal joint 3, and the lower part of the pinion shaft 21 is connected to a gear box 2 of a rack TFI type steering gear for steering the front wheels. A drive pinion (not shown) meshes with a rank 24 formed in the right half of the rack shaft 23. This rack 24 is formed so as to face upward and forward.

A cylinder barrel 29 is installed horizontally in the gear box 20, and the rack shaft 23, which is a piston rod that slides inside the cylinder barrel 29, and the cylinder barrel 29 constitute a power cylinder as is known in the art. Axis 2
There is also a rack 25 in the left half of the third wharf ring.
is formed, and a driven vinyl off 26 is engaged with the rack 25. This rack 25 is formed so as to face upward.

By the way, the shaft 21 of the dry 7'' pinion is tilted backward at the top and slightly to the right, and the shaft 21 of the driven pinion 26 is
7 is disposed approximately horizontally in the front-rear direction, but the rear part thereof is slightly inclined to the right, so that the tooth profiles of the drive pinion and the driven pinion and the racks that mesh with each other are helical teeth.

Tie rods 4, 4 are connected to both ends of the rack shaft 23 that protrudes from the left and right ends of the gear box 20, respectively, and knuckle arms 5, 5 are connected to the outer ends of the tie rods 4.4. ．． It is supported by axles 6, 6 which protrude outwardly from the knuckle arms 5.5.

As is known, the front wheels are steered by the left and right movement of the rack shaft 23, and at this time the steering torque is reduced by the power cylinder.

The rear part of the shaft 27 of the partially driven pinion 26 projects rearward from the gear box 20, and is connected approximately linearly to a long linkage shaft 32 via a universal joint 31. An input shaft 36 is connected via 35.

The input shaft 36 is arranged in alignment with the left-right center line of the vehicle, and includes a holder 41 and a plurality of ring rubbers 42 attached to the outer periphery of the holder 41.
... (in the figure, five wheels) and a rotating member supported by a holder outer 43 that is attached to the outer periphery and fixed to the floor, tunnel, etc. of the vehicle body, and the rear end of this input shaft 36 has an eccentric Franz 37 is formed.

An eccentric pin 38 is formed on the rear surface of the eccentric flange 3γ and projects further rearward, and a joint member 44 is loosely fitted and supported in the center of the eccentric pin 38.

The joint member 44 is short in the vertical direction and long in the horizontal direction, and the front surface 44a of the joint member 44 is
The inner ends of left and right tie rods 8.8 are connected and supported via ball joints 9, 9 at the left and right ends, respectively, and the tip of the arm member 45 is connected to two left and right bolts 46 near the center of the rear surface 44b.
．． It is bound at 46. The base of the arm member 450 extends to the right in a substantially horizontal manner, and the arm member 45 is swingable by a link 47 pivotally supported by a link bracket 48 hanging from the floor panel of the vehicle body. As a result, the soyoint member 44 is kept in a horizontal state and its swinging is restricted.

In addition, a knuckle arm IL11 is connected to the outer ends of the left and right tie rods 8, 8, which are connected and supported by a joint member 44, and a rear wheel 13°13 is connected to an axle 1:2.12 that projects outwardly from the knuckle arm 11.11. is supported.

In the figure, 14 is the front wheel damper unit, 15 is the same Noah rod, 16 is the same lower arm, 17 is the rear wheel damper unit, 18il-1 is the same Noah rod, and 19 is the same lower arm.

When the steering wheel 1 is operated, the left half rack 25 of the steering gear is moved horizontally by the rack shaft 23 of the steering gear.
The rotation necessary for steering the rear wheels is output to the driven pinion 26 that meshes with the rear wheel steering system, and the rotation is input to the input shaft 36 of the rear wheel steering system via the linkage shaft 32, so that the input shaft 36 rotates to either the left or right.

As the input shaft 36 rotates, the eccentric pin 738 integrally provided at the rear end performs crank rotation, and the crank rotation of this eccentric pin 38, which is initially set in the vertical direction (vertically upward in the embodiment) with respect to the input shaft 36, rotates. Joint member 4
4. The rear wheels 13 degrees 13 are steered via the tie rods 8 degrees 8 and knuckle arms 11, 11.

At a small steering angle, the rear wheels 13 are steered in the same phase as the front wheels 7, and at a large steering angle exceeding J rotation, the rear wheels 13 are steered to the opposite phase.

In the present invention, a damper rubber 33 is attached to the outer periphery of the linkage shaft 32 at the center in the longitudinal direction by baking, gluing, or the like.

That is, the damper rubber 33 is formed with protrusions 34 that protrude outward radially along the axial direction, and these protrusions 34...
・Even if the longitudinal central part of the linkage shaft 32, which has a large amount of deflection, bends toward the floor panel of the vehicle body due to the soft elastic action of the , thus the damper rubber
33 can prevent the linkage shaft 32 from coming into direct contact with the floor Zener.The location where the rubber 33 is attached is not limited to the longitudinal center of the linkage shaft 32; The rubber bar 33 may be attached to the front and rear of the central portion, or may be attached over almost the entire length, and the shape of the rubber bar 33 itself is not limited to the embodiment. It may be formed.

As is clear from the above description, according to the present invention, at least a part of the linkage shaft, for example, at the central part in the longitudinal direction, is provided with a bump, an F.
- Since the rubber is installed, even if the linkage shaft is bent, it can be prevented from coming into direct contact with the floor panel of the vehicle body, and the elastic deformation of the damper rubber cushions the linkage shaft against the floor and tunnel. can do 0

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show a preferred embodiment of the present invention, and FIG. 1 is a perspective view showing the schematic configuration of the front and rear wheel steering system, and FIG. 2 is an exploded view of the main parts of the rear wheel steering system. (Main figure, Figure 3 is a longitudinal side view of the same main part in a coarse state, showing the joint member as viewed from a 90' rotation, Figure 4 is an exploded perspective view of the steering gear box part. 8 is the tie rod for rear wheel steering, 2o is the steering gear box driven pinion, 27 is its shaft, 32 td-1)
7 cage shaft, 33 damper rubber, 36 input shaft,
38 is an eccentric pin. Patent Applicant Honda Motor Co., Ltd. Agent Patent Attorney 2 1) Yong-Immediate Question Patent Attorney Kuni Ohashi Production Volume Patent Attorney Yu Koyama

Claims (1)

[Claims] A driven pinion is meshed with a rank shaft that constitutes a rack and pinion type steering gear, and the shaft of the driven pinion and the input shaft of the rear wheel steering system are connected by a long linkage shaft, which is provided at the rear end of the input shaft. In a vehicle steering system, a tie rod for steering left and right rear wheels is connected and supported indirectly or directly to an eccentric pin, and the rear wheels are steered together with the front wheels. A linkage shaft in a vehicle steering device 4 characterized by being equipped with rubber.