JPH04134782U - Rack and pinion steering device - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure that the rack shaft of a rack and pinion type steering device and the ball joint of a tie rod screwed together via a lock washer are prevented from loosening. [Structure] An engaging protrusion is provided on the rack shaft side of the lock washer to engage between the radial grooves at the end of the rack shaft. A recess is formed on the outer surface of the end of the ball joint. A cylindrical portion that fits into the end of the ball joint is formed on the ball joint side of the lock washer. This cylindrical portion is fitted onto the end of the ball joint and fixed by caulking from the outside of the recess.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a rack and pinion type steering device, and in particular, the rack shaft and tie rod. This relates to the structure of the connection part between the head and the ball joint.

0002

[Conventional technology]

Rack and pinion steering devices have tie rod balls on both ends of the rack shaft. The joints are each screwed together, and the end face of the rack shaft and the ball joint A lock washer is interposed between the housing and the lock washer to prevent loosening.

0003 A conventional lock washer, as shown in FIGS. 9 and 10, A hole 100a and two claws 100b are formed in the housing 1 of the ball joint. Pass the male screw 102a at the tip of 02 through the hole 100a and tighten the screw of the rack shaft 104. A radial hole formed at the end of the rack shaft 104 is screwed into the hole 104a. The pawl 100b is engaged between the grooves 104b, and the housing of the ball joint is The end 1 of the lock washer 100 is attached to the flat surface 102b formed on the outer surface of the ring 102. By bending 00c, it is prevented from loosening.

0004

[Problem that the idea aims to solve]

In the above conventional structure, the claw 100b of the lock washer 100 2 falls into the relief groove 102c for forming the male thread 102a at the tip. There were cases (shown by imaginary lines in Figure 9). If this happens, use the lock washer. The bending allowance of the rack end 100c may become smaller, or the claw 100b may be closer to the radius of the rack shaft 104. There are problems such as not hitting the side surface of the directional groove 104b and not being able to obtain sufficient rotation-stopping torque. Ta.

[0005] This invention was devised to eliminate the above-mentioned drawbacks, and the rack shaft and ball joint Rack and pinion type steering device that can reliably regulate relative rotation with It provides:

[0006]

[Means to solve the problem]

The rack and pinion steering device according to the present invention locks onto the end of the rack shaft. The tie rod ball joint is threaded through the washer, and the upper An engaging protrusion is provided on the rack shaft side of the lock washer to engage it in the radial groove of the rack shaft. In addition, the ball joint side of the lock washer has a recess on its outer surface. A cylindrical part is formed that fits into the end of the ball joint, and this cylindrical part is connected to the ball joint. The cylindrical portion is fitted onto the end of the recess and caulked from the outside of the recess.

[0007]

[Effect]

In the rack and pinion power steering device according to the present invention, the lock washer The cylindrical part fits into the end of the ball joint, so it serves as a guide during assembly. The lock washer's engagement protrusion always engages with the radial groove on the rack shaft to ensure that it does not loosen. A ceremony will be held.

[0008]

【Example】

The present invention will be explained below with reference to illustrated embodiments. Figure 1 shows a lamp according to an embodiment of the present invention. FIG. 3 is a vertical cross-sectional view of a main part of the steering device. At the end of rack shaft 2 A cylindrical portion 2a is provided, and two radial notch grooves 2b are formed in this cylindrical portion 2a. has been done. Further, a screw hole 2c is provided inside the cylindrical portion 2a. cylindrical part The inner surface of 2a has a slightly larger diameter than the inner diameter of screw hole 2c.

[0009] A ball joint housing that connects the rack shaft 2 and a tie rod (not shown) A small diameter portion 4a is formed at the end of the ring 4, and a male screw 4b is provided at the axis of the small diameter portion 4a. It is provided. Two recesses 4c are formed in the small diameter portion 4a, and a bow is formed in the small diameter portion 4a. The large diameter portion 4d of the housing 4 of the joint is provided with two flat portions 4e. (See Figure 2).

0010 A lock washer inserted between the rack shaft 2 and the housing 4 of the ball joint. As shown in FIG. The housing 4 has a cylindrical portion 6b with a large diameter, and the housing 4 is located in the center of the flat portion 6a. a hole 6c through which the male screw 4b passes, and two engaging protrusions protruding from the opposite side of the cylindrical part. 6d is provided.

[0011] When assembling the above rack shaft 2 and tie rod ball joint, first Fit the cylindrical part 6b of the washer 6 into the small diameter part 4a of the ball joint housing 4. Then, the two engaging protrusions 6d of the lock washer 6 fit into the notched groove of the rack shaft 2. 2b, insert and screw the male screw 4b into the screw hole 2c of the rack shaft 2. So After that, the cylindrical portion 6b of the lock washer 6 is fitted into the recess 4c of the housing small diameter portion 4a. The lock washer 6 and the housing 4 are fixed by caulking the corresponding positions.

0012 The lock washer 6 has a cylindrical portion 6b that fits into the housing small diameter portion 4a. Therefore, the center of the lock washer 6 and the male screw 4b of the housing 4 and the rack shaft 2 are aligned. Centering with the center is automatically performed, and the engaging protrusion 6d of the lock washer 6 is aligned with the rack shaft. It reliably engages with the side surface of the notch groove 2b of No. 2. Also, the caulking area of lock washer 6 Since the lock washer 6 can also secure the rack shaft 2 and the ball joint, It is possible to reliably perform the lock function with the int.

[0013] In the above embodiment, in order to caulk the lock washer 6, the small diameter portion 4 of the housing 4 is Although the concave portion 4c is formed in the small diameter portion 4a, the present invention is not limited to this. It is only necessary to provide a portion, and various shapes can be selected as shown in FIGS. 5 to 8. .

[0014]

[Effect of the idea]

As described above, according to the present invention, the rack of the rack and pinion type steering device The lock shaft and tie rod ball joint can be securely prevented from loosening. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a rack and pinion steering device according to an embodiment of the present invention, showing a cross section taken along line II in FIG. 4;

FIG. 2 is a perspective view of a tie rod ball joint.

FIG. 3 is a perspective view of a lock washer.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 1;

FIG. 5 is a perspective view showing another example of a ball joint.

FIG. 6 is a perspective view showing another example of a ball joint.

FIG. 7 is a perspective view showing another example of a ball joint.

FIG. 8 is a perspective view showing another example of a ball joint.

FIG. 9 is a longitudinal cross-sectional view of a main part of a conventional rack and pinion steering device.

FIG. 10 is a perspective view showing a conventional lock washer.

[Explanation of symbols]

2 Rack axis 4 Ball joint 4c Ball joint recess 6 Lock washer 6b Lock washer cylindrical part 6d Lock washer engagement protrusion

Claims (1)

[Scope of utility model registration request] Claim 1: In a rack and pinion type steering device in which a ball joint of a tie rod is screwed to the end of a rack shaft via a lock washer, an engaging protrusion is provided on the rack shaft side of the lock washer to adjust the diameter of the rack shaft. At the same time, the ball joint side of the lock washer is formed with a cylindrical part that fits into the end of the ball joint having a recess on the outer surface, and this cylindrical part is fitted into the end of the ball joint. A rack and pinion type steering device characterized in that rotation is prevented by caulking the cylindrical portion from the outside of the recessed portion.