JPS6123954Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a spring-type shock absorber, and more specifically, the end of a sliding body is loosely fitted into the large outer diameter part of a spacer having a large outer diameter part and a small outer diameter part. , a washer is loosely fitted into the small outer diameter part to engage the end of the sliding body, a bolt is inserted into the inner diameter part of the spacer, the male threaded part of the bolt is formed on the inner diameter part of the spacer, and the female thread is formed. The present invention relates to a spring-type shock absorbing device in which the male screw portion of the bolt is screwed into the female screw portion of the main body, and a spring is interposed between the bolt head and the washer.

FIG. 1 is a longitudinal sectional view of a brake valve equipped with a conventional shock absorber. The brake valve comprises supply ports 1, 2, output ports 3, 4, valve discs 5, 6 and pistons 7, 8 associated with the primary and secondary brake circuits, respectively.
The primary piston 7 has a spring 9 at its upper part.
₁ , 9 ₂ , are engaged with the pedal 12 via the plate 10 and the plunger 11 . The secondary piston 8 has its upper extension portion inserted into the valve disk 5, and a secondary pressure chamber 13 is formed on the upper surface thereof.
is communicated with an output pressure chamber 15 formed on the lower surface of the primary piston 7 via a vent hole 14. The valve disks 5 and 6 on the primary side and the secondary side each have a spring 17 interposed between the housing 16 and the housing 16.
18 and its valve seats 19,2
0 are brought into contact with valve seats 21 and 22 provided in the housing 16, respectively, and in a normal state (pedal non-operating state), each supply port 1, 2 and each output port 3, 4
The gap between the two is closed. The valve disks 5 and 6 have exhaust holes 23 and 2 in the direction of their central axes.
4, and the output ports 3 and 4 communicate with the atmosphere through the exhaust hole and the exhaust port 25 in the normal state. However, in the case of a brake valve equipped with a spring-type shock absorber, the upper part of the secondary piston 8 is fitted into a portion of the primary valve disk 5 that corresponds to the exhaust hole 23, so the exhaust hole 23 is The slit 26 extends through the secondary piston 8 in the direction of its central axis, and is further provided with a slit 26 at the upper end of the secondary piston 8 . Note that 27 is a spring that urges the primary piston 7 upward, 28 is a spring that urges the secondary piston 8 downward, and 29 is a spring that urges the secondary piston 8 downward.
₁ , 29 ₂ is a spring that elastically connects the primary piston 7 and the secondary piston 8; 30 and 31 are exhaust valve seats formed at the lower ends of the primary piston 7 and the secondary piston 8, respectively; 32, 33 is a retainer disposed between the housing 16 and each valve disk 5, 6, and 34 is a dust cover.

In the brake valve described above, the shock absorber is constructed between the primary piston 7 and the secondary piston 8. The shock absorber shown here includes a secondary piston 8 as a sliding body on a large outer diameter part 35 of a spacer 37 having a large outer diameter part 35 and a small outer diameter part 36.
At the same time, a washer 39 is loosely fitted into the small outer diameter part 36 to engage the end 38 of the secondary piston 8, and a bolt 41 is inserted into the inner diameter part 40 of the spacer 37. The male screw portion 42 of the bolt is screwed into the female screw portion 43 of the primary piston 7 as the main body, and springs 29 ₁ and 29 ₂ are interposed between the bolt head 44 and the washer 39 .
Note that 45 is a male threaded portion formed on the inner diameter portion 40 of the spacer 37, which is threadedly engaged with the bolt 41 and has the function described below.

The above brake valve operates as follows.
When the primary piston is lowered by operating the brake pedal 12, the shock absorber springs 29 ₁ , 29 ₂
, the biasing force of the spring 28 is removed, and the secondary piston 8 also descends due to the biasing force of the spring 28, causing each exhaust valve seat 30, 31 to close to the valve seat 1 of each valve disk 5, 6.
9 and 20, respectively. Subsequently, the valve disk 5 is removed by the exhaust valve seat 30 of the primary piston 7.
When the valve seat 19 opens to allow compressed air from the supply port 1 to flow into the output pressure chamber 15 and the output port 3, the compressed air from the output pressure chamber 15 flows through the vent hole 14 to the upper surface of the secondary piston 8. It enters the pressure chamber 13, further pushes down the secondary piston 8, and opens the valve seat 20 of the valve disc 6. In this way, each of the supply ports 1 and 2 on the primary and secondary sides is communicated with each of the output ports 3 and 4.

When the brake pedal 12 is released, the primary piston 7 rises due to the biasing force of the spring 27, moves its exhaust valve seat 30 away from the valve seat 19 of the valve disc 5, and connects the output port 3 to the exhaust hole 23, 24 to the atmosphere. The secondary piston 8 is
As the primary piston 7 rises, the biasing force of the springs 29 ₁ and 29 ₂ of the shock absorber increases, and the exhaust valve seat 31 is pulled up by the biasing force of the springs, separating from the valve disk 6, and outputting Connect mouth 4 to exhaust hole 2
4 to communicate with the atmosphere.

In the brake valve described above, the primary piston 7
When installing a shock absorber between the bolt 41 and the secondary piston 8, a pin 46 is installed between the bolt tip and the primary piston 7 to prevent the bolt 41 from loosening due to vibration.
is inserted to connect the two together.

Instead of locking with the pin 46, the inventors used a so-called self-locking bolt 48 in which an elastic material 47 was attached to the tip of the bolt in advance, and the primary piston 7 as the main body and the bolt 48
An attempt was made to prevent the bolt 48 from loosening by interposing an elastic material 47 between the bolt 48 and the male threaded portion 49 of the bolt 48 . However, in the above-mentioned conventional shock absorber, the spacer 37, washer 39, springs 29 ₁ , 29 ₂ and bolts 41 are assembled in advance in the assembly process.
The inner diameter 4 of the spacer 37 is
A female threaded portion 45 is formed in the female threaded portion 0, and a bolt 41 is screwed into the female threaded portion to prevent the spacer 37, washer 39, springs 29 ₁ , 29 ₂ and bolt 41 from coming off. Therefore, when using the self-locking bolt 48, when the elastic material 47 at the tip of the bolt threads through the female threaded portion 45 of the spacer 37, the elastic material 47 is peeled off at that portion, and as a result, the primary side When the male threaded end portion 49 of the bolt 48 is screwed into the female threaded portion 43 of the piston 7, both spring portions 43,
The elastic material 47 is not sufficiently filled between the holes 49 and the locking action is not reliable.

Therefore, in order to solve these problems, the inventors used a self-locking bolt 48 as the bolt as shown in FIG. In arranging the female threaded portion 45, the inner diameter α of the female threaded portion was made larger than the specified dimension β.

The graph in Figure 4 shows M6 self-locking bolt 4.
8, the inner diameter α of the female threaded portion 45 of the spacer 37
When the specified size β = 4917〓, C and female thread part 4
This figure shows the measurement results of the unscrewing rotational torque in the case where the inner diameter α of No. 5 is set to 545〓, which is larger than the specified size β. As a result, as shown in the graph, it was proven that the product B of the present invention maintains a significantly higher torque than the conventional product C.

Note that it is preferable that the inner diameter α of the female threaded portion 45 of the spacer 37 is sufficiently larger than the specified dimension, but at least the spring portion 42 of the bolt 41 is attached to the spacer 37.
It must be kept within a range where it can be screwed together with the female threaded portion 45 of.

As mentioned above, since the spring-type shock absorber A according to the present invention uses a self-locking bolt, the assembly work is extremely simple, and the inner diameter of the female thread formed on the inner diameter of the spacer is smaller than the specified dimension. Since it is large, the self-locking bolt can be firmly screwed into the main body without impairing its function.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a brake valve equipped with a conventional spring-type shock absorber, Fig. 2 is an enlarged sectional view of the spring-type shock absorber according to the present invention, and Fig. 3 is an exploded sectional view showing its main parts. FIG. 4 is a torque characteristic diagram comparing a conventional spring-type shock absorber in which self-locking bolts are simply used with the present invention. 7...Primary side piston (main body), 8...Secondary side piston (sliding body), 29 ₁ , 29 ₂ ...Spring,
35... Large diameter part, 36... Small diameter part, 37... Spacer, 38... End part, 39... Washer, 40...
...Inner diameter part, 43... Female threaded part, 45... Female threaded part, 47... Elastic material, 48... Self-locking bolt, 49... Male threaded part.

Claims (1)

[Scope of utility model registration request] The end of the sliding body is loosely fitted into the large outer diameter part of a spacer having a large outer diameter part and a small outer diameter part, and a washer is loosely fitted into the small outer diameter part to engage the end part of the sliding body. A bolt is inserted into the inner diameter part of the spacer, and the male threaded part of the bolt is screwed into the female threaded part formed in the inner diameter part of the spacer, and the male threaded part of the bolt is screwed into the female threaded part of the main body. Further, in a spring type shock absorbing device in which a spring is interposed between the bolt head and the washer, a self-locking bolt having an elastic material attached to the male threaded end of the bolt is used as the bolt, and the spacer is 1. A spring-type shock absorber characterized in that the inner diameter of a female screw formed in the inner diameter portion of the spring-type shock absorber is larger than specified dimensions.