JPH0343455Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Function) The present invention relates to a pin coupling device for construction machinery and industrial machinery.

(Prior Art) As shown in Fig. 3, a conventional pin coupling device for a hydraulic excavator has a bush 2 fixed to both ends of a hole in a boss 1 of an arm, and a round hole in the bush 2 and a bracket 3 in a bucket. A pin 4 is inserted into the round hole, and the head of the pin 4 is pressed by a presser foot 5.
It is stopped from falling out. Further, the hole in the boss 1 has a large diameter in the middle, and a hole 6 communicating with the outer peripheral surface is provided in the large diameter portion, and a grease nipple 7 is attached to the outer end of the hole 6. Further, there are notches at the outer circumferential edge of the boss 1 and the outer circumferential edge of the bracket adjacent to the boss 1, and O-rings 8 are attached to both the notches.

In the pin coupling device for a hydraulic excavator described above, grease is supplied to the sliding surfaces of the pin 4, bush 2, and bracket 3 through the grease nipple 7.
The same parts are lubricated.

(Problems to be Solved by the Invention) In the pin coupling device shown in FIG. 3, the O-ring 8 closes the gap 9 between the edge of the boss 1 and the edge of the bracket 3. It is insufficient to prevent infiltration, and the gap 9 wears out with use due to the infiltrated dust and strong impact, and generates an impact sound every time force is applied to the bucket. Further, in order to adjust the gap 9, methods such as shim adjustment or pressing a boss to one side have been used, but there was a problem that it was very time-consuming.

(Means for Solving the Problems) The present invention addresses the above-mentioned problems and uses a pin connection in which a pin is inserted through a plurality of brackets and a boss of a supported body inserted between each bracket. The device includes a gap adjustment member inserted through the pin between one of the brackets and the boss corresponding to the bracket, and a grease filling chamber that presses the gap adjustment member in the pin axial direction. The purpose of the pin coupling device is to easily adjust the gap between the boss and the bracket so that the boss and the bracket collide in the direction of the pin axis. It is an object of the present invention to provide a pin coupling device which can prevent impact noise caused by the bolts and prevent wear between the boss end face and the bracket end face.

(Embodiment) Next, the pin coupling device of the present invention will be explained with reference to the embodiment shown in FIGS. 1 and 2. In the example of Figure 1,
1 is a boss, 3 is a bracket, 4 is a pin, 5 is a presser foot, 6 is a hole, and 7 is a grease nipple, and each of the above parts is the same as in FIG. Then, between the bracket 3 on one side and the boss 1, the inner cylinder and the outer cylinder are slid together with the cylindrical part 3a of the bracket 3 on one side sandwiched between them, and the inner peripheral surface of the inner cylinder is slid together with the pin 4, A gap adjustment member 10 is provided, which is a float whose bottom outer surface connects the inner cylinder and the outer cylinder and slides on the side surface of the boss 1. O-rings 11 and 12 are provided between the two. Further, a grease nipple 13 is provided on the outer peripheral surface of the gap adjusting member 10, so that grease can be injected into a grease filling chamber 10a between the gap adjusting member 10 and the cylindrical portion 3a of the bracket 3. Further, a cover 14 protects the grease nipple 13, and a cover 7a protects the grease nipple 7.

In the example shown in Fig. 2, 1 is the boss, 2 is the bush, 3 is the bracket, 4 is the pin, 5 is the presser foot, and 6 is the
is a hole, 7 is a grease nipple, and 8 is an O-ring, which are the same as in Fig. 3. And bracket 3 on one side
The inner side of the cylindrical part 3a, which is the part into which the pin 4 is inserted, is thinner to form a grease filling chamber 15 between the pin 4 and the pin 4.
A gap adjustment member 16 consisting of a ring-shaped float that slides on the inner surface of the gap adjustment member 1 is provided.
6 and the cylindrical portion 3a and the pin 4, an O-ring 17,
18 are provided. Further, a grease nipple 19 is provided on the outer peripheral surface of the cylindrical portion 3a of the bracket 3, so that grease can be injected into the grease filling chamber 15. Also, grease nipple 19,
7 is provided with a cover 20, 7a.

(Function) Next, the function of the pin coupling device will be explained. 1st
In the illustrated example, grease is injected into the grease nipple 13 during daily inspection. The grease injected into the grease filling chamber 10a presses the gap adjustment member 10 against the end face of the boss 1, causing the bracket 3 and the boss 1 to
The gap between the two is adjusted.

In the example shown in FIG. 2, when grease is injected into the grease filling chamber 15 through the grease nipple 19 during daily inspection, the clearance adjustment member 16 presses the end face of the boss 1, and the clearance adjustment member 16 presses the end face of the boss 1 and The gap between the bracket 3 and the bracket 3 is adjusted.

In each of the above-described embodiments, the gap between the boss 1 and the bracket 3 is easily adjusted to prevent the generation of impact noise when operating the supported object, and the gap between the end surface of the boss 1 and the opposing end surface of the bracket 3 is easily adjusted. Can prevent wear.

(Effects of the invention) As described above, the present invention provides a pin coupling device in which a pin is inserted through a plurality of brackets and a boss of a supported body inserted between the brackets. Since it is provided with a gap adjusting member inserted between the boss facing the bracket and the pin, and a pressing means consisting of a grease filling chamber that presses the gap adjusting member in the pin axial direction, the above-mentioned By injecting a filler (grease) into the grease filling chamber during daily inspection, the gap between the bracket end face of the supported object and the end face of the boss of the opposing arm is adjusted, and the supported object is placed against the arm. This can prevent the impact noise that occurs when the motor is driven. It also has the effect of preventing wear on the opposing end surfaces of the boss and the bracket.

It should be noted that providing a supply means for supplying appropriate pressure oil from an appropriate hydraulic source to the grease filling chambers 10a and 15 will provide a sufficient effect.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an embodiment of the transverse gap adjustment device for a pivot joint of the present invention, Fig. 2 is a longitudinal sectional front view showing another embodiment of the invention, and Fig. 3 is a conventional pivot joint. FIG. 1...Boss, 3...Bracket, 4...Pin,
10, 16... Gap adjustment member, 10a, 15...
Grease filling room.

Claims (1)

[Scope of utility model registration request] In a pin coupling device in which a pin is inserted through a plurality of brackets and a boss of a supported body inserted between the brackets, the pin is inserted between one of the brackets and the boss facing the bracket. 1. A pin coupling device comprising: a gap adjusting member inserted through the pin; and a pressing means comprising a grease filling chamber for pressing the gap adjusting member in the pin axis direction.