JPH10278810A - Mounting structure of steering gear box - Google Patents

Abstract

(57) [Problem] To provide a centering of a pinion shaft with respect to a mounting hole of a vehicle body, a sufficient sealing effect with respect to the mounting hole of the vehicle body, and to receive a reaction force during steering. Another object of the present invention is to provide a steering gear box mounting structure that can follow the vehicle. SOLUTION: The mounting structure of the steering gear box according to the present invention is provided between a vehicle body 2 in which a pinion shaft 4 is inserted through a mounting hole 6 and a gear box casing 3 to which one end 4a of the pinion shaft 4 is connected. An elastic rubber seal bush 9 is provided around the pinion shaft 4, and a high-rigidity insert member 10 is embedded in a thick portion 9 a of the seal bush 9, and the seal bush 9 of the insert member 10 is provided. The base end 10a protruding from the gear box casing 3 is attached to the gear box casing 3, and the distal end 13 of the seal bush 9 is fitted to the peripheral edge 6a of the attachment hole 6 on the vehicle body 2 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a steering gear box mounted on a four-wheel vehicle.

[0002]

2. Description of the Related Art As a conventional rack and pinion type steering gear box for a four-wheeled vehicle, there is, for example, one shown in FIGS. A portion A at one end of such a steering gear box 51 is fitted with a U-shaped mount bracket 53 having flange portions 53a at both ends from above a rubber bush 52, and tightened with a plurality of bolts 54 and nuts 55. (See FIG. 3). A portion B near the pinion portion of the steering gear box 51 is attached to a vehicle body 56 by fitting a mount bracket 58 from above a mount rubber 57 and tightening a plurality of bolts 54 and nuts 55 (FIG. 1). 4).

On the other hand, around a pinion shaft 59 of the steering gear box 51, as shown in FIG. 5, a seal boot 61 having a bellows portion 60 integrally formed of rubber or soft resin is covered. The box-side end 61a of the seal boot 61 is fitted to the outer peripheral surface of the casing 62 of the steering gear box 51, and the vehicle-body-side end 61b is mounted by fitting the groove 63 into the periphery of the mounting hole 64 of the vehicle body 56. Have been. That is, the seal boot 61 is provided between the pinion shaft 59 and the vehicle body 56, and the seal boot 61 seals the inside and outside of the vehicle compartment.

[0004]

As described above, in the conventional steering gear box 51, both the portion A and the portion B are fastened and fixed via the rubber bush 52 and the mount rubber 57. This is because the steering gear box 51 tends to be displaced relative to the vehicle body 56 due to the steering reaction transmitted from the tire, and it is necessary to allow and absorb this behavior. Because it is essential to prevent However, the use of rubber parts for the mounting means, on the other hand, compresses and assembles the rubber bush 52 and the mounting rubber 57, so that when the bolts 54 are tightened, the tightening sequence and the tightening torque are reduced. Depending on the method of application, the compression of the rubber component is not performed uniformly, as shown in FIG.
The steering gear box 51 rotates in the direction C around the rack shaft 65. As a result, since the pinion shaft 59 is inclined or eccentric with respect to the mounting hole 64, there occurs a problem that the pinion shaft 59 and the seal boot 61 or the steering shaft joint 66 and the seal boot 61 interfere with each other. Was.

The present invention has been made in view of such circumstances, and it is an object of the present invention to reliably center a pinion shaft with respect to a mounting hole of a vehicle body and to provide a sufficient sealing effect with respect to the mounting hole of a vehicle body. It is another object of the present invention to provide a mounting structure for a steering gear box which can be followed even when receiving a reaction force at the time of steering.

[0006]

In order to solve the problems of the prior art, according to the first aspect of the present invention, there is provided a vehicle body in which a pinion shaft is inserted through a mounting hole, and one end of the pinion shaft. In a steering gear box mounting structure in which an elastic body is disposed around the pinion shaft between a gear box casing to which the elastic member is connected, a highly rigid insert member is embedded inside the elastic body. A base end of the insert member protruding from the elastic body is mounted on the gear box casing, and a distal end of the elastic body is mounted on a mounting hole on the vehicle body side.

Further, in the present invention of claim 2, the tip of the elastic body of claim 1 is formed in a tapered shape, and the periphery of the mounting hole on the vehicle body side of claim 1 is the same as that of the elastic body. The elastic body is formed so as to be upright in a tapered shape, and the distal end of the elastic body is fitted and fitted to the peripheral edge of the mounting hole.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 shows an embodiment of a mounting structure for a steering gear box according to the present invention. In the figure, reference numeral 1 denotes a rack-and-pinion type steering gear box provided in a four-wheeled vehicle. And a gear box casing 3 disposed on the outside O side of the vehicle compartment. The gear box casing 3 is provided along the width direction of the four-wheeled vehicle, and the mounting structure at two locations on the left and right thereof is the same as that of the conventional example.
Inside the gear box casing 3, one end 4a of a pinion shaft 4 extending in the vertical direction and a rack shaft 5 extending in the vehicle width direction are arranged.
One end 4 a of the pinion shaft 4 is rotatably connected to the gear box casing 3, and is supported in a state of being engaged with the rack shaft 5.

The other end 4b of the pinion shaft 4 is inserted through the mounting hole 6 of the vehicle body panel 2 into the vehicle cabin R side, and is positioned obliquely upward toward the rear of the vehicle body. It is connected to a supported steering shaft 7 via a universal joint 8. Therefore, the rotation of a steering wheel (not shown) attached to the upper end of the steering shaft 7 is converted into a steering motion of the front tire via the steering shaft 7, the universal joint 8, the pinion shaft 4, the rack shaft 5, and the like. It has become so.

On the other hand, an elastic rubber seal bush 9 is disposed between the vehicle body panel 2 and the gear box casing 3 and around the outside of the pinion shaft 4. The seal bush 9 is a cylindrical body whose outer shape is a truncated conical shape and whose upper and lower ends are open, and has an inner diameter that is large enough to allow the pinion shaft 4 to penetrate. A high-rigidity (made of steel or hard plastic) insert member 10 is embedded in the thick portion 9a of the seal bush 9 up to the vicinity of a tip portion described later, and the insert member 10 has sufficient rigidity for the seal bush 9. Is given. The insert member 10 is manufactured using a drawn pipe material or the like. The bush side is formed in a shape and size corresponding to the seal bush 9, and the casing side is formed in a length protruding from the seal bush 9. Have been. On the inner peripheral surface of the base end portion 10 a protruding from the seal bush 9 of the insert member 10, there is formed a screw groove 12 screwed with a screw portion 11 formed on the outer peripheral surface of the pinion shaft outlet 3 a of the gear box casing 3. It is engraved.

The seal bush 9 is provided on the vehicle body panel 2.
The tip 13 has a small diameter near the side and is further formed into a tapered tapered portion 13 to be fitted in the mounting hole 6. And
The corresponding peripheral edge portion 6a of the mounting hole 6 is formed by burring and formed upright in the same tapered shape as the seal bush 9, and is disposed so as to protrude toward the vehicle cabin R side. The distal end portion 13 of the seal bush 9 and the peripheral edge portion 6a of the mounting hole 6 are formed in such a length that they can absorb the forward and backward movements of the pinion shaft 4 by tapered portions that abut each other.

In order to mount the steering gear box 1 by the mounting structure according to the embodiment of the present invention, the screw groove 12 of the insert member 10 is previously screwed and fixed to the screw portion 11 of the gear box casing 3 by tightening. The seal bush 9 is attached to the gear box casing 3 in advance. When the complete assembly of the steering gear box 1 is mounted on the vehicle body, the distal end portion 13 of the seal bush 9 is pressed into and fitted to the peripheral edge portion 6a of the mounting hole 6 on the vehicle body 2 side. When the two mounting brackets are bolted together, the mounting operation is completed.

In the mounting structure according to the embodiment of the present invention, when mounting the steering gear box 1 on the vehicle body side, the distal end portion 13 of the seal bush 9 having sufficient rigidity is pressed against the peripheral edge portion 6a of the mounting hole 6. The pinion shaft 4 is positioned in the immediate vicinity of the pinion shaft 4, so that the influence of the tightening order and the tightening torque of the left and right mounting bracket bolts is eliminated, and the pinion shaft 4 is attached to the mounting hole 6 of the vehicle body 2. Centering can always be performed, and workability is improved. The surface of the tip portion 13 of the seal bush 9 is made of rubber having elasticity and is in contact with the vehicle body 2 via the rubber. Even if it is slightly displaced, it can be absorbed and absorbed by the deflection of the rubber. Furthermore, since the rubber material of the tip portion 13 is in close contact with the peripheral edge portion 6a of the mounting hole 6 by taper fitting, strong friction is obtained between the vehicle body 2 and the seal bush 9, Sealing is ensured.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes are possible based on the technical idea of the present invention. is there.

For example, in the seal bush 9 in the above-described embodiment, the base end 10a of the insert member 10 is connected to the pinion shaft outlet 3a of the gear box casing 3.
It is fixed by screwing to the outer peripheral surface of
Other fixing means can be used as long as they can be fixed to the gear box casing 3 reliably.

[0017]

As described above, the mounting structure for a steering gear box according to the present invention comprises a vehicle body in which a pinion shaft is inserted through a mounting hole and a gear box casing to which one end of the pinion shaft is connected. An elastic body is disposed around the pinion shaft, a high-rigidity insert member is embedded inside the elastic body, and the base end of the insert member protruding from the elastic body is connected to the gear. The pinion shaft is attached to the box casing, and the distal end of the elastic body is attached to the mounting hole on the vehicle body side. Therefore, the pinion shaft can be reliably centered with respect to the mounting hole of the vehicle body by the elastic body having sufficient rigidity. This does not interfere with the elastic body, so that the mounting workability can be improved. Moreover, in the mounting structure of the present invention, since the vehicle is in contact with the vehicle body via the distal end portion of the elastic body, even the input of the steering reaction force follows the slight displacement of the steering gear box by the bending of the elastic body. be able to.

Further, in the mounting structure for a steering gear box according to the present invention, the distal end of the elastic body is formed in a tapered shape, and the peripheral edge of the mounting hole on the vehicle body side is formed in the same tapered shape as the elastic body. Since it is also possible to mount the elastic body by fitting the tip of the elastic body to the peripheral edge of the mounting hole, the mounting hole of the vehicle body and the elastic body are in close contact with each other, and a strong sealing effect on the mounting hole of the vehicle body is obtained. Obtainable.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a steering gear box near a pinion shaft attached to a vehicle body panel by an attachment structure according to an embodiment of the present invention.

FIG. 2 is a front view showing a conventional steering gear box.

FIG. 3 is a cross-sectional view showing a mounting structure of a portion A in FIG. 2;

FIG. 4 is a sectional view showing a mounting structure of a portion B in FIG. 2;

FIG. 5 is a sectional view showing the vicinity of a pinion shaft mounting portion of the steering gear box in FIG. 2;

FIG. 6 is a cross-sectional view showing a state where the pinion shaft in FIG. 5 is inclined with respect to a mounting hole on the vehicle body side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steering gear box 2 Body panel 3 Gear box casing 4 Pinion shaft 6 Mounting hole 6a Peripheral edge of mounting hole 9 Rubber seal bush 9a Thick portion of rubber seal bush 10 Insert member 11 Screw portion 12 Screw groove 13 Tip of rubber seal bush

Claims (2)

[Claims] 1. An elastic body is provided around a periphery of the pinion shaft between a vehicle body into which a pinion shaft is inserted through a mounting hole and a gear box casing to which one end of the pinion shaft is connected. In the mounting structure for a steering gear box, a highly rigid insert member is embedded in the elastic body, and a base end of the insert member protruding from the elastic body is attached to the gear box casing, and a distal end of the elastic body A mounting structure for a steering gear box, wherein a portion is mounted in a mounting hole on the vehicle body side. 2. A front end portion of the elastic body is formed in a tapered shape, and a peripheral portion of a mounting hole on the vehicle body side is also formed upright in the same tapered shape as the elastic body. The mounting structure for a steering gear box according to claim 1, wherein the mounting structure is fitted with a peripheral portion of the mounting hole.