JPH0445821Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shock absorbing structure for a striking device attached to an excavator such as a hydraulic excavator.

[Conventional technology]

FIG. 4 shows a hydraulic excavator equipped with a conventional impact device, in which 1 is an arm;
A striking device 3 is attached to the end of the cylinder 2 and a cylinder 2 for driving a bucket (not shown). FIG. 5 shows an enlarged view of the striking device 3 in FIG. 4,
A main body 5 equipped with a vibrating body (chisel) 4 has a bolt 6
It is fixed to the bracket 7 by. The bracket 7 is pivotally connected to the arm 1 and the cylinder 2 by pins 8 and 9 with cylindrical elastic members interposed therebetween, similar to the structure disclosed in Japanese Utility Model Publication No. 59-20441. . As a result, vibrations and shocks acting on the vibrating body 4 and the main body 5 are absorbed by the elastic member, so that the arm 1 and the cylinder 2
has no effect on the

[The problem that the idea attempts to solve]

However, the above-mentioned conventional technology has the following problems.

(1) When vibration and impact acting on the main body 5 cause engagement between the arm 1 and cylinder 2 and the pins 8 and 9, the pins 8 and 9 rotate while pressing against the elastic members, so the elastic members press against the pins. It will be sheared by the rotational force of 8 and 9.

(2) The pin 8 at the end of the arm 1 is subjected to the resultant force of the vibrating body 4 and the cylinder 2, and even if the pressing force of the vibrating body 4 is constant, the elastic member is affected by the length of expansion and contraction of the cylinder 2. Since the applied force changes significantly, it is difficult to set up an elastic member that has a damping effect in all postures of the main body 5, that is, in all angular positions of the main body 5 with respect to the arm 1.

The present invention has been made in view of the problems of the prior art described above, and provides a shock absorbing structure for a striking device for an excavator that can prevent shearing of the elastic member and provide a shock absorbing effect in all postures of the main body. The purpose is to

[Means to solve the problem]

To achieve this object, the invention provides a first bracket 10 which is pivotally connected to the arm end of the excavator and a cylinder for driving the bucket, and a second bracket 10 to which the body 16 with the chisel is fixed integrally. bracket 11 and cylindrical bosses 19 and 20 provided on the first bracket 10, respectively, and the boss 1 is inserted into the second bracket 11.
Thick part 2 provided to face 9 and 20
1, 22, 23, and 24, and these pins 28, 29 are each formed into an insertable cylindrical shape, and the pins 28, 29 and the bosses 19, 20 an elastic member 3 that absorbs vibrations and shocks in the radial direction of the pins 28 and 29 transmitted through the main body 16 and the second bracket 11;
0, each of the pins 28 and 29 is formed into an insertable annular shape, and is arranged in the gap between the pins 28 and 29 and the bosses 19 and 20, respectively,
When the force applied to the elastic member 30 due to vibrations and shocks transmitted to the second bracket 11 is greater than a predetermined value, it comes into contact with the pins 28 and 29 to prevent excessive deformation of the elastic member 30. The bush 26 and the pins 28, 29 are each formed into an insertable annular shape, and the bosses 19, 2
The thick portions 21, 22, 23, 24 corresponding to 0
Elastic members 25 are disposed in the gaps between the main body 16 and the second bracket 11 to absorb vibrations and shocks in the thrust direction of the bosses 19 and 20 transmitted through the main body 16 and the second bracket 11.

[Effect]

The present invention is constructed as described above, and includes two pins 2 that connect the two brackets 10 and 11.
8 and 29 do not rotate, and the elastic member 30 only repeats expansion and contraction, and no shearing occurs due to the engagement of the pins 28 and 29. Further, even if the length of the cylinder to expand and contract changes, the pressing force acting on the two pins 28 and 29 and the elastic member 30 remains almost constant.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Fig. 1 is a side view showing one embodiment of the present invention, Fig. 2 is a view taken along arrow A-A in Fig. 1, and Fig. 3 is a side view showing an embodiment of the present invention.
The figure is a partial sectional view taken along the line BB in FIG. 1.

Reference numerals 10 and 11 denote a pair of brackets, the first bracket 10 being formed by two connected plates, and the bracket 10 having a pin 1.
2 and 13, it is pivotally connected to an arm end of an excavator (not shown) and a cylinder for driving a bracket. The second bracket 11 is composed of two opposing plates, and is integrally fixed to the main body 16 by a plurality of bolts 14 and nuts 15. 17,18
A plate connects two plates of the bracket 10, and cylindrical bosses 19 and 20 are fixed to each plate by two brackets. Bosses 19 and 20 are respectively bracket 1
A cylindrical elastic member (elastic rubber or the like) 25 is inserted between opposing thick parts 21 to 24 formed at two places on each of the two plates of 1.
Reference numeral 26 denotes an annular bush inserted into the gap between both ends of the bosses 19 and 20 and the corresponding thick parts 21 to 24, and 27 refers to the thick parts 21 to 24, respectively.
It is a bush that is inserted into the pin insertion hole. 2
8 and 29 are pins inserted into the bushes 27 and 28 and the elastic member 25, respectively;
are also inserted into cylindrical elastic members (elastic rubber or the like) 30 arranged in the gaps between these pins 28, 29 and bosses 19, 20, respectively. Reference numeral 31 denotes a stopper for preventing the pins 28 and 29 from coming off, and the stopper 31 is fixed to the respective pins 28 and 29 by bolts 32.

In the embodiment configured in this manner, when vibrations and shocks are applied to the main body 16 from the chisel, the vibrations and shocks transmitted through the bracket 11 in the radial direction of the pins 28 and 29 are transmitted to the elastic member 3.
The vibrations and shocks that are absorbed by the elastic member 25 and transmitted to the bracket 11 in the thrust direction of the bosses 19 and 20 are absorbed by the elastic member 25. Therefore, the propagation of vibrations and shocks to the bracket 10, the arm, and the cylinder can be suppressed.

Further, when a force exceeding a predetermined value is applied to the pins 28 and 29, the bush 26 comes into contact with the pins 28 and 29 to prevent the elastic member 30 from breaking.

When the bracket 10 is swung by the expansion and contraction of the cylinder, the pin 1 connected to the arm is
3 is subjected to a rotational force and a reaction force acting on the main body 16, but only the reaction force acting on the main body 16 acts on the pins 28 and 29, and the pins 28 and 29 do not rotate.

Further, if the reaction force applied from the chisel to the main body 16 is constant, the load applied to the pins 28 and 29 is constant, and thereby the elastic force of the elastic member 30 can be easily set.

[Effect of idea]

According to the shock absorber of the present invention described above, it is possible to prevent shearing of the elastic member that absorbs vibrations and impacts in the radial direction of the pin.

The cushioning effect of the elastic member can be obtained in all postures of the main body.

[Brief explanation of drawings]

Fig. 1 is a side view showing one embodiment of the shock absorbing structure of the striking device of the present invention, Fig. 2 is a view taken along the line A-A in Fig. 1, and Fig. 3 is a section taken along the line B-B in Fig. 1. 4 is a side view showing a hydraulic excavator to which a conventional impact device is attached, and FIG. 5 is an enlarged side view of the impact device shown in FIG. 4. 10...First bracket, 11...Second bracket, 16...Main body, 19, 20...Boss,
21, 22, 23, 24... Thick part, 25... Elastic member, 26... Bush, 28, 29... Pin, 30... Elastic member.

Claims (1)

[Scope of utility model registration request] A first bracket 10 is pivotally connected to the arm end of an excavator and a cylinder for driving a bucket; a second bracket 11 is integrally fixed to a main body 16 having a chisel; It is inserted into each of the provided cylindrical bosses 19 and 20, and is supported by thick portions 21, 22, 23, and 24 provided in the second bracket 11 so as to face the bosses 19 and 20, respectively. The two pins 28, 29 and these pins 28,
The pins 28 and 2 are each formed into an insertable cylindrical shape, are arranged in the gaps between the pins 28 and 29 and the bosses 19 and 20, and are transmitted through the main body 16 and the second bracket 11.
An elastic member 30 absorbing vibrations and shocks in the radial direction of 9 and the pins 28 and 29 are each formed into an insertable annular shape, and the pins 28 and 2
9 and the bosses 19, 20, respectively, and when the force applied to the elastic member 30 due to the vibration and impact transmitted to the second bracket 11 exceeds a predetermined value, the pins 28, 29 A bush 26 that comes into contact with the boss 1 to prevent excessive deformation of the elastic member 30, and a ring shape into which the pins 28 and 29 can be inserted, respectively.
The thick portions 21, 22, 2 corresponding to 9, 20
3 and 24, respectively, to absorb vibrations and shocks in the thrust direction of the bosses 19 and 20 transmitted via the main body 16 and the second bracket 11. A shock absorbing structure for the striking device.