JPH036543Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rack mount insulator used when a gear housing housing a steering rack shaft is attached to a vehicle body.

BACKGROUND TECHNOLOGY Currently, there are various types of steering devices for automobiles.
There is a rack-and-pinion type steering device in which the steering wheels are rotated by the movement of the rack shaft. In this steering device, the rack shaft is slidably housed in a gear housing, and the gear housing is supported by a vehicle body such as a dash panel via a rack mount insulator.

Incidentally, the rack mount insulator is generally provided with an elastic body that covers the outer periphery of the gear housing, and this elastic body reduces transmission of rack shaft vibration to the vehicle body. However, in the case of such an elastic body, the supporting rigidity of the elastic body changes as the gear housing moves in the axial direction, so that the amount of steering of the steered wheels is not constant, which may adversely affect running stability.

Therefore, in order to solve this problem, there is an application filed by the present applicant as Utility Model Application No. 1984-84133. As shown in FIG. 4, this rack mount insulator 1 includes an inner cylinder 3, an outer cylinder 4 arranged perpendicular to the axis of a rack shaft 2, and an elastic body 5 loaded between the inner and outer cylinders 3 and 4. A pair of elastic bushes 6, 6a are provided, the outer cylinder 4 is fixed to the gear housing 7 side, and
The inner cylinder 3 is adapted to be attached to a vehicle body 9 via a mounting bolt 8. When the gear housing 7 moves in the axial direction, the elastic body 5 disposed perpendicular to the rack shaft 2 is completely compressed, so that the support rigidity becomes constant and running stability is improved. It's getting old.

Problems to be Solved by the Invention However, in the conventional rack mount insulator 1, the inner cylinder 3 is formed into a tubular shape, and the mounting bolt 8 is fitted into the tubular inner cylinder 3 in a substantially tight manner. , the head 8a of the mounting bolt 8 is adapted to be locked to the tip of the inner cylinder 3. Therefore, the mounting bolt 8 is projected from the vehicle body 9 by the length of the inner cylinder 3, and the bending strength of the mounting bolt 8 is significantly reduced. For this reason, the supporting rigidity of the gear housing 7 is reduced, and in order to improve this supporting rigidity, the diameter of the mounting bolt 8 has to be increased.
Rack mount insulator 1 due to larger diameter
becomes large. In addition, since the head 8a of the mounting bolt 8 protrudes from the tip of the inner cylinder 3, the swing of the power unit disposed in a narrow engine room can cause interference between the power unit and other auxiliary parts. There was a problem with interference, which inevitably required a large amount of space in front of the rack shaft.

Therefore, the present invention reduces the amount of protrusion of the mounting bolt by storing and locking the head of the mounting bolt in the inner cylinder, and prevents the head from protruding from the tip of the inner cylinder. The purpose of the present invention is to provide a rack mount insulator with a high-performance design.

Means for Solving the Problems In order to achieve the above object, the present invention comprises an inner cylinder, an outer cylinder arranged perpendicular to the axis of the rack shaft, and an elastic body loaded between these inner and outer cylinders. A pair of elastic bushes are provided, the inner tube is attached to one of the gear housing side or the vehicle body side of the rack shaft via a mounting bolt, and the outer tube is attached to the other one of the gear housing side or the vehicle body side. In the rack mount insulator, the inner cylinder is formed into a cylindrical shape with a bottom, and a bolt insertion hole is formed at the bottom of the inner cylinder, and the head of a mounting bolt inserted into the bolt insertion hole and the inner cylinder are formed. The bottom portion is sandwiched and fixed between the vehicle body side or the gear housing side to which the gear housing is attached.

Effect With the above structure, in the rack mount insulator of the present invention, the inner cylinder is formed into a bottomed cylinder shape, and the head of the mounting bolt is housed in this cylindrical inner cylinder, so the tip of the inner cylinder This prevents the head from protruding from the top. Furthermore, since the bottom of the cylindrical inner cylinder is held between the head of the mounting bolt and the vehicle body or gear housing side to which the inner cylinder is attached, the amount of protrusion of the mounting bolt is equal to the thickness of the bottom. , this amount of protrusion is significantly reduced.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIGS. 1 and 2 show a rack mount insulator 10 showing an embodiment of the present invention. It is becoming more and more common. That is, the rack mount insulator 10 consists of a pair of elastic bushes 14, 14a arranged perpendicularly to the rack shaft 11.
4 and 14a are attached to openings 15 and 15a respectively formed at both ends of the flange portion 13 with the gear housing 12 as a boundary.

The elastic bushes 14, 14a are connected to the inner cylinders 16, 1
6a, and the opening 15 used as an outer cylinder.
Elastic bodies 17, 1 loaded between the periphery of 15a and between these inner cylinders 16, 16a and openings 15, 15a.
7a. the inner cylinder 16,
16a has bottom portions 19, 19a on one end, that is, on the side of the vehicle body 18 to which the inner cylinders 16, 16a are to be attached.
The bottom portions 19, 19 are formed into a cylindrical shape with a bottom.
Bolt insertion holes 21, 21a for mounting bolts 20, 20a are formed in the center of a. Mounting bolts 20, 2 are inserted into the bolt insertion holes 21, 21a from the other end openings of the inner cylinders 16, 16a.
By screwing and fixing 0a to the vehicle body 18 side, the bottom portions 19, 19a are clamped between the heads 22, 22a of the mounting bolts 20, 20a and the vehicle body 18,
Thus, the inner cylinders 16, 16a are fixed to the vehicle body 18 side.

With the above configuration, in the rack mount insulator 10 of this embodiment, the gear housing 1
2 is attached to the vehicle body 18 via a pair of elastic bushes 14, 14a disposed perpendicularly to the rack shaft 11, and the elastic bushes 14, 14 respond to axial displacement of the gear housing 12.
Since the elastic bodies 17 and 17a of a can support the gear housing 12 with a certain rigidity,
Driving safety will be improved.

By the way, in this embodiment, the elastic bush 1
The inner cylinders 16, 16a of 4, 14a are formed into a cylinder shape with a bottom, and the mounting bolts 20, 2 are inserted into the inner cylinders 16, 16a.
Since the heads 22, 22a of 0a are housed, the heads 22,
22a can be prevented from protruding. Therefore, the rack shaft 11
The front space can be reduced, making it easier to lay out the power unit and auxiliary equipment in a narrow engine room.

Further, the inner cylinders 16, 16a have a bottom portion 19,
19a is the head 22,2 of the mounting bolt 20,20a
Since it is designed to be fixed by being narrowly attached between 2a and the vehicle body 18, the mounting bolt 2
0,20a protrusion from the vehicle body 18 (head 22,
The amount of protrusion up to 22a is equal to the thickness of the bottom portions 19, 19a, and the amount of protrusion is significantly shortened. Therefore, the mounting bolt 2 for a predetermined load in the bending direction
The strength of the inner cylinder 16, 20a is significantly improved, and the inner cylinder 16,
As the mounting strength of the rack shaft 16a increases, the support rigidity of the rack shaft 11 increases, and this also improves running stability.

In the above embodiment, the pair of inner cylinders 16,
Although the case where the inner cylinders 16a are provided independently from each other has been shown, the present invention is not limited to this, and a pair of inner cylinders 16, 16a may be fixed to each other via a connecting portion 30 as shown in FIG.

Further, in this embodiment, the inner cylinders 16, 16a are connected to the vehicle body 1.
Although the flange portion 13 in which the openings 15 and 15a as the outer cylinder are fixed to the gear housing 12 side is disclosed, the inner cylinder is not limited to this. , the outer cylinder may be fixed to the vehicle body 18 side.

Effects of the Invention As explained above, in the rack mount insulator of the present invention, the inner cylinder of the elastic bushing arranged in the direction perpendicular to the axis of the rack shaft is formed into a bottomed cylinder shape. The head of the mounting bolt is accommodated, and the bottom of the inner cylinder is clamped between the member to which the inner cylinder is attached and the head of the mounting bolt, so that the head of the mounting bolt is located inside the inner cylinder. By being housed inside, the head does not protrude from the tip of the inner cylinder, and the space in front of the rack shaft is expanded, making it easier to lay out the power unit and auxiliary equipment. In addition, since the bottom portion is clamped between the member for attaching the inner cylinder and the head of the attachment bolt, the amount of protrusion of the attachment bolt is significantly shortened, and the bending strength of the attachment bolt is greatly improved. This has the excellent effect of contributing to improved stability.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a rack mount insulator showing one embodiment of the present invention, Fig. 2 is a sectional view taken from the line - - in Fig. 1, and Fig. 3 is a sectional view showing another embodiment of the invention. 4 are cross-sectional views of a conventional rack mount insulator. 10... Rack mount insulator, 11
...Rack shaft, 12...Gear housing, 14,
14a...Elastic bushing, 15, 15a...Opening (outer cylinder), 16, 16a...Inner cylinder, 17, 17
a...Elastic body, 18...Car body, 19, 19a...
Bottom, 20, 20a...Mounting bolt, 22, 22
a...Head.

Claims (1)

[Scope of utility model registration request] A pair of elastic bushes each having an inner cylinder, an outer cylinder, and an elastic body loaded between these inner and outer cylinders are arranged perpendicular to the axis of the rack shaft, and the inner cylinder is located on the gear housing side of the rack shaft. Alternatively, in a rack mount insulator that is attached to one side of the vehicle body via a mounting bolt, and the outer tube is attached to the gear housing side or the other side of the vehicle body, the inner tube is shaped like a cylinder with a bottom. A bolt insertion hole is formed in the bottom of the bolt insertion hole, and the bottom portion is held between the head of a mounting bolt inserted into the bolt insertion hole and the vehicle body side or gear housing side to which the inner cylinder is installed. A rack mount insulator characterized by being fixed in place.