JPH066308Y2 - Anti-vibration bush structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vibration-proof bushing structure applicable to, for example, a mounting structure in which a cylinder block and a cylinder head are fastened and fixed with bolts via a gasket.

[Conventional technology]

Conventionally, as shown in FIG. 4, a vibration damping rubber bush structure is applied to the intake manifold mounting structure. The anti-vibration rubber bush structure has a first structure such as a cylinder head.
When the member 27 and the second member 26 such as the intake manifold are fixed by tightening with the bolt 28 via the elastic body 22 such as the gasket, the rubber bush 21 for vibration isolation is provided between the second member 26 and the bolt 28. Is interposed.

The rubber bush 21 includes a small diameter portion 24 and a large diameter portion 25, the small diameter portion 24 is fitted into a mounting hole 29 formed in the second member 26, and the large diameter portion 25 is attached to the upper surface of the second member 26 and the bolt 28. It is sandwiched between the head collar part 31 and the. The collar 2 is provided between the head collar 31 of the bolt 28 and the first member 27.
3 is interposed, and the screwing position of the bolt 28 into the first member 27 is regulated to a predetermined amount. In the figure, 30 denotes a through hole of the bolt 28 formed in the gasket 22.

Further, a mounting structure for an intake manifold as disclosed in Japanese Utility Model Laid-Open No. 58-146073 is disclosed. The intake manifold mounting structure is one in which the downstream end of the intake manifold is fastened to the mounting portion of the cylinder head via an elastic body for absorbing vibration from the engine body side. Is connected to the flange of the intake manifold, and the other plate is fastened to the mounting portion of the cylinder head together with the intake manifold with stepped bolts.

[Problems to be solved by the invention]

However, with respect to the anti-vibration rubber bushing structure as shown in FIG. 4, the deterioration of the rubber causes creeping or sag in the rubber itself, but the bolt 28 has the collar 23.
It is fixed at a predetermined position with respect to the first member 27 by means of, so that the rubber bush 21 only receives the initial pressure. Therefore, the tightening pressure and the gasket surface pressure decrease due to creep of the rubber bush itself, which may cause leakage of fluid such as air.

Further, regarding the intake manifold mounting structure disclosed in Japanese Utility Model Laid-Open No. 58-146073, one plate is connected to a flange portion of the intake manifold, and the other plate is mounted on the mounting portion of the cylinder head together with the intake manifold. Although the bolts are tightened with attached bolts, the bushes interposed between the bolts and the flange portion of the intake manifold have the same problems as those of the rubber bushes.

Therefore, an object of the present invention is to solve the above-mentioned problems, and even if the bush is worn out due to long-term use, the surface pressure of the gasket or packing between the first member and the second member and (EN) An anti-vibration bush structure that prevents the leakage of fluid such as air by giving elastic force to a bush by a spring force of a snap ring and a disc spring so that the tightening force does not decrease.

[Means for solving problems]

The present invention is configured as follows in order to achieve the above object. That is, according to the present invention, a mounting hole having a tapered surface is formed in an edge portion, a bolt is inserted into the mounting hole, and a second member is mounted on the first member with a gasket interposed.
A member, a bush having a tapered surface corresponding to the tapered surface and fitted into the mounting hole between the second member and the bolt, and formed on an inner peripheral surface of a through hole of the bush corresponding to the tapered surface. And a snap ring which is disposed in the groove and biases a spring force outward in the radial direction to the bush.

Further, in this vibration-proof bush structure, a disc spring is arranged between the large-diameter portion of the bush and the bolt head of the bolt, and the disc spring uses the first member and the second member as the bolt. In the fixed state, the end tapered surface of the large diameter portion of the bush is pressed in the direction of the second member.

Further, in this vibration-proof bush structure, the snap ring has a spreading force outward in the radial direction in order to apply a spring force to the bush, and the bush is provided between the bolt and the first member. The collar fitted in the through hole is arranged.

[Action]

The vibration-proof bushing structure according to the present invention is configured as described above and operates as follows. That is, in this anti-vibration bush structure, the snap ring and the disc spring can be incorporated in the bush so that the bush has an elastic force, that is, a spring force. Therefore, even if the bush is deteriorated due to long-term use, A second member such as an intake manifold can be pressed by urging a spring force outward in the radial direction on the bush with a snap ring and a disc spring.
The surface pressure of the gasket between the member and the second member can always be kept constant.

Therefore, if this vibration-proof bushing structure is used, fluid will not leak from between the first member and the second member, between the second member and the bush, and between the bush and the bolt.

〔Example〕

Hereinafter, an embodiment of a vibration-proof bushing structure according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a vibration-proof bushing structure 10 according to the present invention.
Is generally indicated by. This anti-vibration bush structure 10
When the first member 7 such as the cylinder head and the second member 6 such as the intake manifold are fastened and fixed by the bolt 14 via the gasket 2 (including the packing), the space between the second member 6 and the bolt 14 is fixed. A bush 1 such as a rubber bush is interposed for vibration isolation.

The bush 1 mainly includes a small diameter portion 15, a large diameter portion 16, and a tapered surface 11 connecting the small diameter portion 15 and the large diameter portion 16.
A through hole 17 through which the collar 3 penetrates is formed in the center of the bush 1. An annular groove 8 is formed on the inner peripheral surface of the bush 1 at the portion of the tapered surface 11. The small diameter portion 15 of the bush 1 is the mounting hole 1 formed in the second member 6.
It has been inserted in 9. The large diameter portion 16 of the bush 1 is arranged between the upper surface of the second member 6 and the head collar portion 18 of the bolt 14. On the other hand, a tapered surface 9 is formed at the edge portion on the upper surface side of the mounting hole 19 formed in the second member 6. And
The small-diameter portion 15 of the bush 1 is fitted into the mounting hole 19 of the second member 6 in a state where the tapered surface 11 of the bush 1 is in contact with the tapered surface 9 of the edge portion of the mounting hole 19.

Further, the collar 3 is interposed between the head collar portion 18 of the bolt 14 and the first member 7, and the first member 7 of the bolt 14 is provided.
The screw-in position is restricted to a predetermined amount. Further, a disc spring 4 for pressing the bush 1 against the second member 6 is arranged in contact with and integrated with the upper surface of the bush 1.

FIG. 2 is a sectional view of the bush taken along the line II-II in FIG. As shown in FIG. 2, a snap ring 5 having a spreading force outward in the radial direction is arranged in an annular groove 8 formed on the inner peripheral surface of the bush 1.

FIG. 3 is an enlarged sectional view showing a portion A in FIG.
FIG. 3 shows the relationship between the bush 1, the disc spring 4, the snap ring 5 and the second member 6 in detail. In general,
When the bush 1 such as a rubber bush is used for a long period of time, creep or sag occurs due to deterioration of the bush 1 itself, that is, a material such as rubber. Due to this deterioration of the material, the surface pressure of the tapered surfaces 11 and 13 of the bush 1 decreases. Therefore, if a spring force is not applied to the bush 1, the tightening pressure on the gasket 2 sandwiched between the first member 7 and the second member 6 decreases, and, for example, fluid such as intake air is The problem of leakage arises.

However, in this vibration-proof bushing structure 10, the spring force is applied to the bush 1 by the disc spring 4 located on the upper surface of the bush 1 and the snap ring 5 located inside the bush 1. Therefore, the tapered surface 13 of the upper surface of the bush 1
When the surface pressure of the disk spring 4 decreases, the tapered surface 12 of the disc spring 4 contacts the tapered surface 13 of the bush 1, and the disc spring 4 causes F
The force of ₁ works and the surface pressure of the bush 1 can be compensated.

Further, when the surface pressure of the taper surface 11 on the lower surface of the bush 1 decreases, the snap ring 5 serving as a spring exerts the force F ₂ by the expanding force acting outward in the radial direction. The bush 1 itself has a surface pressure of a resultant force F of F _X and F _Y , but the force F _{1 of} the disc spring 4 and the force F _{2 of the} snap ring 5 work to produce ΔF _X and ΔF _Y. The resultant force ΔF increases.

That is, the total surface pressure F ₃ due to the bush 1 itself, the disc spring 4 and the snap ring 5 is expressed by the following equation.

Since F = F _X + F _Y , ΔF = ΔF _X + ΔF _Y.

Therefore, F ₃ = F + ΔF.

As a result, even if the elastic force F of the bush 1 decreases, the surface pressure of the bush 1 against the second member 6 is increased by the force ΔF by the disc spring 4 and the snap ring 5, and the surface pressure of the bush 1 itself is prevented from decreasing. Therefore, the tightening pressure of the gasket 2 can be kept constant.

[Effect of device]

The vibration-proof bushing structure according to the present invention is configured as described above and has the following effects. That is, in this anti-vibration bush structure, a second member such as an intake manifold is fastened with a bolt to a first member such as a cylinder head, and a bush such as a rubber bush is interposed between the second member and the bolt. Since the bush including the disc spring and the snap ring incorporated in the bush exerts a spring force on the bush with respect to the second member, even if the bush and the gasket are deteriorated due to long-term use, the bush is deteriorated. By the spring force of the spring, that is, the disc spring and the snap ring being biased to itself, the bush can press the second member with a predetermined elastic force, and the surface pressure of the gasket can be kept constant. Can be maintained at.

Therefore, fluid such as intake air does not leak from between the first member such as a cylinder head and the gasket and between the second member such as an intake manifold and the gasket. Moreover, since the bush, the disc spring, and the snap ring can be integrated into a structure, the number of working steps can be reduced, and the workability can be improved. Also, this anti-vibration bush structure
For example, in order to obtain the same effect, the cost can be reduced as compared with the case where the coil spring is used.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a vibration-proof bushing structure according to the present invention, FIG. 2 is a cross-sectional view of the bush taken along line II-II in FIG. 1, and FIG. The enlarged sectional view and FIG. 4 are sectional views showing a conventional anti-vibration rubber bush structure. 1 ... Bush, 2 ... Gasket, 3 ... Color, 4 ...
… Belleville spring, 5 …… Snap ring, 6 …… Second member, 7
...... First member, 8 ... Annular groove (groove), 9, 11, 12,
13 ... Tapered surface, 10 ... Anti-vibration bush structure, 14 ...
Bolt, 15 ... small diameter part, 16 ... large diameter part, 17 ... through hole, 18 ... bolt head collar part, 19 ... mounting hole.

Claims (3)

[Scope of utility model registration request] 1. A second member having a mounting hole having a tapered surface formed at an edge thereof, the bolt being inserted into the mounting hole, and the second member being mounted on the first member with a gasket interposed therebetween, which corresponds to the tapered surface. A bush having a tapered surface and fitted in the mounting hole between the second member and the bolt, a groove formed in the inner peripheral surface of the through hole of the bush corresponding to the tapered surface, and the inside of the groove. An anti-vibration bush structure, comprising a snap ring that is arranged to urge a spring force outward in the radial direction on the bush. 2. A disc spring is arranged between a large diameter portion of the bush and a bolt head portion of the bolt, and the disc spring is in a state where the second member is fixed to the first member by the bolt. The antivibration bush structure according to claim 1, wherein an end taper surface of the large diameter portion of the bush is pressed toward the second member. 3. The snap ring has a spreading force outward in the radial direction to apply a spring force to the bush, and the through hole of the bush is provided between the bolt and the first member. The vibration-isolating bush structure according to claim 1, characterized in that a collar inserted in the is arranged.