JPS5973364A - Relay rod for steering linkage - Google Patents

Abstract

PURPOSE:To facilitate forging operation and reduce the cost of dies and facilities by a method wherein rod end members made of solid metal material are connected to both ends of a main body of rod made of metal pipe. CONSTITUTION:A relay rod 1 is constructed such that a pair of rod end members 1b, 1b composed of solid metal member are connected to both ends of the main body 1a of rod made of metal pipe, and joints 10, 10 are attached to extremity ends of each of the rod end members 1b, 1b. Inner surfaces at the end parts 1c, 1c of the main body of the rod invade the rugged part 11 in form of plastic flow and also invade grooves 12, 12, resulting in that the main body of rod 1a and rod end members 1b, 1b are rigidly connected to each other in both circumferential direction and axial direction. Since each of rod members 1b, 1b can be machined under a condition in wich they are separated from the main body 1a of the rod, it is possible to make a small-sized forging facilities.

Description

[Detailed Description of the Invention] Is the present invention an automobile steering system? This relates to the Lero 1F steering linkage used in the H.

As shown in FIG. 1 as an example, a steering linkage for an automobile is composed of a relay rod 1, a hydraulic rod 2.2, a pilot arm 7, and an idler arm 4. The F-era tie rod 2.2 is pivotally connected to the relay rod I by studs 5, 5. 6
, 6 are stud mounting holes.

Conventionally, the relay rod I has generally been formed by forging using a single solid steel bar. In this case, since the entire length of the relay rod I is forged integrally, the mold cost required for forging is high, and the force and power required for forging are large, so large-scale equipment with large capacity is required. There is. In addition, when the relay rod (1) is used in a steering linkage, a large bending force is applied to it, so in order to improve steering stability, it is necessary to increase the rod diameter and increase the bending rigidity. However, when the diameter is made thicker, conventional solid bars have the disadvantage of a large increase in gravity. It is easy to forge, which reduces mold and equipment costs, and it is also possible to improve bending rigidity without increasing weight.
The present invention provides a relay rod for a steering linkage, characterized in that rod end members made of a solid metal material are connected to both ends of a rod body made of a metal pipe. be.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, numeral 1 indicates a relay rod. This relay rod l connects both ends of a rod body 1a made of a metal pipe (=, a pair of mouth/socket end parts tb, xb made of solid metal material), and each rod end member 1b,
It is constructed by attaching an in-joint in, 10, to the tip of the lb. One joint 1θ is connected to the pi sotoman arm 3 as shown in Fig. 1, and the other joint 1θ is
0 is pivoted to the idler arm 4.

To explain an example of the manufacturing process of the relay rod 2, the square opening/south end members 1b and Zb are formed by forging from bar steel. Further, an annular uneven portion 11 along one circumferential direction is formed by rolling at the proximal end portion of the rod end member 1b, that is, the caulked portion for connection with the rod body 1a, and the rod body 1a is connected to the rod end member 1b. Grooves r:z, t2 for preventing rotation are formed by pressing along the axial direction. Note that the pitch between the convex portions in the E-recording convex portion II is small on both sides IH+1!3 of the uneven portion 77 (see Figure 3), and the pitch between the convex portions is large in the intermediate portion 12. It is formed like this.

Next, stud mounting holes 6 are provided in each rod end member 1b and Ib.
．． 6 to the predetermined dimensions by machining.

Further, the rod body 1a is manufactured in advance by cutting a metal pipe, for example, 8TKM15A, into a predetermined length. Then, insert the proximal ends of the mouth/rod end members 1b and rb into the openings at both ends of the rod body 1a, and use a jig to set the mouth/rod end members 1b and rb at predetermined positions.
The front end members zb, zb are fixed, and in this state, they are pressed from the outside using molds 13a, 13b, I3c as shown in FIG. 5, and caulking is performed.

By doing this, the end 7C of the rod body.

This is because the inner surface of rc bites into the uneven portion 11 due to plasticity and also bites into the grooves 12.12.

The rod body 1a and the rod end members r, b, and rb are firmly connected to each other in the axial direction and in the axial direction.

Regarding the conventional product (using a solid round bar with an outer diameter of 21 Wl) and the product of this example (using a cod pipe with an outer diameter of 27.211 mm and a wall thickness of 3.2 Wl), the conventional product is 1 and 1. Cross-sectional area +
A comparison of the moment of inertia ratio of the IIfi plane and the bending stress ratio is as shown in Table 1 below.

Table 1 As is clear from Table 1 above, this example has a smaller cross-sectional area and higher bending rigidity than the conventional product.

In addition, in order to obtain the same bending rigidity as the product of this example, a solid round bar requires a rod with an outer diameter of 245 mm, and in this case, the rod with an outer diameter of 245 mm is required. The cross-sectional area is increased by 1.95 times, resulting in a significant increase in the number of heavy layers.

As described above, according to this embodiment, the bending rigidity of the relay rod I can be increased without causing any increase in weight, and in other words, it is possible to reduce the weight.

Moreover, each short end member 7b, 7b is the rod main body 1a.
Since it can be processed separately from the forging, it is possible to downsize the equipment required for forging, as well as the mouth and end parts 1.
Since b and lb themselves are short parts, the stud mounting hole 6
, 6 is easier to work with when machining 5, and workability is improved.

In the above embodiment, caulking is used as a means for connecting the rod body 7a and the rod end members 1b, lb, but friction welding, which is a type of welding, may be used, for example. Further, since the short end member may be made of a solid metal material, it may be formed by forging from a steel bar [2] Alternatively, it may be formed by sintering or powder forging using metal powder as a raw material. It goes without saying that the shapes of the rod main body and the short end member are not limited to those shown in the drawings, and can be modified in various ways.

As described above, in the present invention, a relay rod is constructed by connecting rod end members made of solid metal to both ends of the mouth and main body made of a control pipe, so that one long solid rod is integrated into one body. Compared to conventional products that require molding, forging or machining of stud mounting holes can be easily performed, and mold costs and equipment costs required for molding are particularly reduced. In addition, since the mouth/socket body can be made hollow, even if the outer diameter is increased to increase bending rigidity, there is no increase in weight, making it possible to obtain a lightweight and highly rigid relay mouth/socket. Extremely effective.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the steering linkage, Figs. 2 to 5 show an embodiment of the present invention, Fig. 2 is a perspective view of the relay rod, and Fig. 3 is a perspective view of the donkey body and the mouth/sword end member. A cross-sectional view of the connection part, FIG. 4 is TV- in FIG. 3.
A sectional view taken along the TV line, and FIG. 5 is a sectional view showing an example of a mold used for caulking the connecting portion. I...Relay rod, Ia...Robanod body,
lb, lb...Kotto end member.

Claims (4)

[Claims] (1) A relay rod for a steering linkage, characterized in that a mouth/rod end member made of a solid metal material is connected to both ends of a mouth/rod body made of a metal pipe. (2) The rod body and rod end member are connected by inserting the proximal end of the rod end member into the openings at both ends of the mouth/socket body. The steering linkage according to claim 1, wherein the steering linkage is tightened by tightening the outer side. (3) The base end of the rod end member is provided with a rotation preventing groove along the axial direction. . (4) The steering linkage rod according to claim 1, wherein the rod body and the rod end member are connected by friction welding.