JPH0663927U - Connecting pin for construction machinery - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to reliably supply a lubricant to a portion where two members are rotatably connected by a connecting pin. [Configuration] Lubricant passages 3a, 3 are provided inside the connecting pin 3.
b is provided, a partial range b of the lubricant portion of the bush 4 is used as a lubricant passage, and the number of external pipes is minimized.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a connecting pin portion capable of supplying a lubricant in a construction machine.

[0002]

[Prior art]

 Conventionally, the connecting pin portion g is lubricated by the fixed pipe b of the front link a as shown in FIG. 3, and the tip end connecting pin e of the swing link d supported by the connecting pin c is lubricated as follows. The hose f and other flexible piping were used.

[0003]

[Problems to be solved by the device]

 In the structure of the conventional connecting pin described above, the hose that supplies the lubricant constantly moves due to the swinging motion of the link, is worn or damaged due to contact with members, etc. There was a problem that it was easily damaged by the fall of the.

[0004]

[Means for Solving the Problems]

 The present invention has been made in view of the above problems, and a passage for a lubricant is provided inside the connecting pin, and a part of the bush lubricant is used as a passage for the lubricant to reduce external piping as much as possible. .

[0005]

[Action]

 Therefore, the piping parts such as hoses arranged outside the member are reduced, so that it is not worn or broken due to contact due to the movement of the member or damaged by the fall of foreign matter from other parts.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the lubricant is supplied to the bush 4 of the connecting pin 3 between the front member 1 and the previous member 2 from the end surface of the connecting pin 3 through the passage inside the plate 5 from the fixed pipe A. It is supplied to both ends separately through an internal passage, and lubricates the bush 4 in the range indicated by a.

On the other hand, the lubricant supplied from the fixed pipe B to the inside of the connecting pin 3 through the plate 5 lubricates the central portion of the bush 4 indicated by b, and the internal pressure does not escape to the portion a of the bush 4. With the function of the O-ring 6 provided as described above, while maintaining the internal pressure, the oil is supplied to the lubricating point 9 of the connecting pin bush at the tip of the previous member 2 via the passage 7 of the previous member 2 and the fixed pipe 8. Will be done. Of course, the fixed pipe 8 is provided with a cover 10 that protects it from external impact.

Since such a lubrication pipe is used, there is no pipe portion that comes into contact with the member 2 even if the member 2 moves, so that there is no fear of wear or breakage, and damage such as a hose that pops out to the outside. The lubricant can be reliably supplied to the connecting pin bush at the tip by eliminating the part that is easily affected.

[0009]

[Effect of device]

 This invention is constructed as described above, and the deformation free pipe is abolished in the lubricating pipe of the connecting pin bush of the two members that are rotatably connected by the connecting pin, and the fixed pipe prevents wear, breakage and damage. Prevents the lubricant from being supplied reliably.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a connecting pin of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 shows piping in the vicinity of the conventional connecting pin portion of FIG.

[Explanation of symbols]

 1 Front member 2 Destination member 3 Connecting pin 4 Bushing 6 O-ring

Claims (1)

[Scope of utility model registration request] 1. A passage for a lubricant is provided inside a connecting pin at a portion where two members are rotatably connected by a connecting pin, and a pipe attached to a member in front of
Lubricate the bush and at the same time O
A connecting pin for construction machinery, characterized in that the internal pressure is maintained by a seal such as a ring, and lubricant can be supplied to the previous member as well.