JP2000027843A - Rotary pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fill grease on a surface where is brought into contact with a bearing while ensuring a predetermined strength. SOLUTION: A grease hole 13 extends from one end part of a rotary pin 11 to an eccentric part 12 in an axial direction, and a pair of grease filling ports 14 communicated with the grease hole 13 are opened to an outer peripheral surface of the eccentric part 12. Their grease filling ports 14 are arranged, partitioning from an axial direction center part C of the eccentric part 12 into positions of L/4 on both side of the center part C in the case where an axial direction length of the eccentric part 12 is set as L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating pin, and more particularly to a structure of a pin with a grease hole rotatably supported by a bearing.

[0002]

2. Description of the Related Art FIG. 4 shows a part of a rear axle of a forklift. A cylinder rod 5 of a cylinder 4 is connected via a tie rod 3 to a knuckle arm 2 formed on the axle of the steered wheel 1. The knuckle arm 2 and the tie rod 3 are rotatably connected to each other by a rotating pin 6, and the tie rod 3 and the cylinder rod 5 are rotatably connected to each other by a rotating pin 7. The steered wheel 1 rotates around the kingpin 8 via the steering wheel 1.

FIG. 5 shows a rotary pin 7 for connecting the tie rod 3 and the cylinder rod 5. The rotating pin 7 has an eccentric portion 9 rotatably supported by a bearing of the tie rod 3. When the rotating pin 7 is rotated around the axis with respect to the cylinder rod 5, the eccentric portion 9 rotates. In order to rotate about the center axis of the pin 7, the relative position between the tie rod 3 and the cylinder rod 5 changes according to the rotation angle. Thereby, fine adjustment of the steering angle of the steered wheels 1 is performed.

Each time the steered wheel 1 is steered by expanding and contracting the cylinder rod 5, the tie rod 3 rotates around the eccentric portion 9 of the rotating pin 7. Therefore, in order to improve lubricity between the eccentric portion 9 of the rotating pin 7 and the bearing of the tie rod 3 and prevent wear of these contact surfaces, a grease hole 10 is formed in the rotating pin 7 from its upper end, The grease hole 10 is open on the outer peripheral surface of the eccentric portion 9 and the grease hole 10
The grease can be injected into the outer peripheral surface of the eccentric part 9 from the upper part of the rotating pin 7 via the.

[0005]

However, in the prior art, as shown in FIG. 5, a grease hole 10 is formed on one diameter of the eccentric portion 9 at a central portion in the axial direction. 5, the grease hole 10 penetrates the portion where the load acts the largest, and the strength of the rotating pin 7 is reduced. For this reason, for example, when an excessive impact force is applied to the steered wheels 1 or the like from the outside, the strength of the rotary pin 7 may be uneasy.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a rotating pin capable of injecting grease into a contact surface with a bearing while securing a predetermined strength. And

[0007]

A rotary pin according to the present invention is a rotary pin rotatably supported by a bearing,
A grease hole extending in the axial direction from one end thereof, and a plurality of grease inlets which are arranged on both sides of the axial center portion of the contact surface with the bearing and are arranged on the contact surface and communicate with the grease holes, respectively. It is provided with. A plurality of grease inlets can be arranged at L / 4 positions on both sides from the axial center of the contact surface, where L is the axial length of the contact surface with the bearing. Further, a spherical pin whose contact surface with the bearing is convex toward the outside may be used. Further, the edge of each grease inlet can be chamfered.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Embodiment 1 FIG. 1 and 2 show a first embodiment of the present invention.
1 shows a rotating pin 11 according to the first embodiment. The rotating pin 11 has an eccentric portion 12 whose outer peripheral surface is convex toward the outside. When the rotating pin 11 is used, the eccentric portion 12 is rotatably supported by a bearing such as a tie rod. The Rukoto. A grease hole 13 extends in the axial direction from one end of the rotating pin 11 to the eccentric portion 12. Further, a pair of grease injection ports 14 communicating with the grease holes 13 is opened on the outer peripheral surface of the eccentric portion 12. These grease inlets 14 are arranged at L / 4 positions on both sides from the axial center portion C of the eccentric portion 12 with the axial length of the eccentric portion 12 being L, and face the opposite directions. .

That is, the eccentric portion 1 on which a large load acts
The grease hole 13 is not opened in the central portion C in the axial direction. For this reason, sufficient strength is secured as a rotating pin. In particular, in the rotating pin 11 according to the first embodiment, since the eccentric portion 12 supported by the bearing has a convex shape outward, a maximum load is applied to the axial center portion C, and the axial center portion C is applied. The bending load becomes minimum at the position of L / 4 on both sides from C, but since the grease inlet 14 is arranged at the position of the minimum load, the rotation caused by the formation of the grease hole 13 and the grease inlet 14 is caused. A decrease in the strength of the pin 11 can be minimized. Further, the periphery of the grease injection port 14 is chamfered in a conical shape.

When the rotating pin 11 is used, the eccentric portion 12 is supported by a bearing such as a tie rod and the like. It is led out from the grease inlet 14 onto the outer peripheral surface of the eccentric portion 12 which is the contact surface with the bearing. At this time, since the two grease inlets 14 are not arranged at the same height position (axial position) but arranged on both sides of the axial central portion C, the grease is one-sided relative to the axial central portion C. Is uniformly injected on the outer peripheral surface of the eccentric portion 12 without being injected toward the side of the eccentric portion. Since the periphery of each grease inlet 14 is chamfered in a conical shape, the uniform injection of grease is further promoted.

Embodiment 2 FIG. 3A shows the second embodiment.
1 shows a rotating pin 21 according to the first embodiment. The rotary pin 21 has four grease injection ports 24, 24, 25, 25 communicating with the grease hole 23 on the outer peripheral surface of the eccentric part 22. Two of these grease inlets 24, 24 are disposed at a position of L / 4 on one side from the axial center of the eccentric part 22 with respect to the axial length L of the eccentric part 22, and are located one diameter above each other. , The remaining two grease injection ports 25, 25
The grease injection ports 24, 24 are arranged at a position of L / 4 from the center in the axial direction to the other side and on a diameter parallel to the diameter of the grease injection ports 24, 24.

With such a configuration, grease can be more evenly injected. Also in the second embodiment, a grease hole 23 is formed at the axial center of the eccentric part 22.
Since there is no opening, sufficient strength is secured.

Further, since the grease inlets 24, 24 located on the base end side of the grease hole 23 have slightly higher grease filling pressure than the grease inlets 25, 25 located farther away, FIG. 3 (b), the grease inlets 34, 34 at the base end side of the grease hole 33, like the rotating pin 31 shown in FIG.
Even if the diameter of the grease is smaller than that of the grease injection ports 35 on the end side of the grease hole 33, grease can be uniformly injected.

Furthermore, the rotating pin 4 shown in FIG.
1, the grease injection port 4 at the base end side of the grease hole 43.
4, 44 and a grease inlet 45 at the end of the grease hole 43,
45 can also be arranged on two mutually orthogonal and spaced diameters.

In each of the above embodiments, the spherical pin whose eccentric portion has a convex shape toward the outside has been described. However, the present invention is not limited to the spherical pin, and the present invention is not limited to the spherical pin. The present invention can also be applied to a rotating pin having a cylindrical contact surface. Further, the present invention may be applied to a rotating pin having no eccentric portion.

[0016]

As described above, according to the present invention, a plurality of grease injection ports are arranged on both sides of the central portion in the axial direction of the contact surface with the bearing, and are arranged on the contact surface.
It is possible to inject grease into the contact surface with the bearing while securing a predetermined strength.

[Brief description of the drawings]

FIG. 1 is a side view showing a rotating pin according to Embodiment 1 of the present invention.

FIG. 2 is a front view showing the rotating pin according to the first embodiment.

FIG. 3A is a side view showing a rotating pin according to a second embodiment, and FIGS. 3B and 3C are side views each showing a modification of the second embodiment.

FIG. 4 is a partially broken plan view showing a rear axle of the forklift.

FIG. 5 is a side view showing a conventional rotating pin.

[Explanation of symbols]

11, 21, 31, 41 Rotating pin 12, 22, 32, 42 Eccentric part 13, 23, 33, 43 Grease hole 14, 24, 25, 34, 35, 44, 45 Grease inlet

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshitoshi Iwanaga 2-1-1 Toyota-cho, Kariya-shi, Aichi F-term in Toyota Industries Corporation (reference) 3D034 BB02 BC04 BC15 BC25 3J105 AA13 AB31 AC03 BC32 BC42

Claims (4)

[Claims] 1. A rotary pin rotatably supported by a bearing, wherein a grease hole extending in an axial direction from one end of the rotary pin is distributed to both sides of a central portion of a contact surface with the bearing in an axial direction. And a plurality of grease injection ports respectively connected to the grease hole and 2. The plurality of grease inlets are arranged such that the length in the axial direction of a contact surface with a bearing is L, and the grease inlets are arranged at L / 4 positions on both sides from the axial center of the contact surface. The rotating pin according to claim 1, wherein 3. The rotating pin according to claim 1, wherein a contact surface with the bearing is a spherical pin having a convex shape outward. 4. The rotating pin according to claim 1, wherein an edge of each grease inlet is chamfered.