JPH0218842Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rolling insulator that absorbs rotational oscillations, so-called rolling inputs, generated in automobile internal combustion engines, etc. The purpose of this invention is to present a rolling insulator that can efficiently cope with the situation.

In internal combustion engines, rotational vibrations are unavoidable due to rotational torque fluctuations, crankshaft imbalance, etc., so a rolling engine radar is used as a means to block the propagation of these rotational vibrations to the machine base. It is used.

1 and 2 show an example of this type of rolling insulator, in which an elastic member 1 is made of a rubber-like elastic material and has a substantially disk shape, and a center portion of the elastic member 1 is made of a rubber-like elastic material. 2 consisting of a center boss 2 integrally baked and a case 3 having a substantially cylindrical shape and integrally baked on the outer circumferential side of the elastic member 1;
supporting members 5, 5 in the axial direction (vertical direction in the figure)
Arranged at both ends, in the middle between both support members 5, 5,
A partition wall 10 having a substantially disk shape and having a communication passage 7 extending in the direction of the central axis connecting both support members 5, 5 and a valve insertion hole 9 extending in a direction perpendicular to the central axis direction.
A rotary valve 11 having a substantially rod-like shape and having a communication opening 12 running in the diametrical direction is rotatably inserted into the valve hole 9, and is inserted into the working fluid chambers 14, 14 formed on both sides of the partition wall 10. is filled with working fluid.

The rolling insulator with the above configuration is
The center bosses 2, 2 at both ends are connected to each other by a connecting means (not shown), and are connected to either the engine or the machine base, and the bulkhead 10
is connected to the other of the engine and the machine base via a connecting means (not shown) attached to the partition wall 10, and the rotational oscillation caused as the engine rotates.
Due to the elastic force of the elastic member 1 and the deformation of the elastic member 1, a flow from one working fluid chamber 14 passes through the communication passage 7 and the communication opening 12 of the rotary valve 11 to the other working fluid chamber 14 side. The fluid is absorbed by the flow resistance added to the moving working fluid, and the rotary valve 11 is rotated by a control device (not shown) that operates according to the operating condition of the engine, and the communication passage 7 of the partition wall 10 and By adjusting the area of the working fluid passage formed by the communication opening 12 of the rotary valve 11, the fluid flow resistance applied to the working fluid passing through the working fluid passage is adjusted. In other words, when the frequency of vibration caused by the engine is high, the cross-sectional area of the working fluid flow path described above increases to keep the flow resistance low, and when the frequency of vibration becomes low, such as during idling, for example. The cross-sectional area of the above-mentioned working fluid flow path is narrowed to increase the flow resistance and ensure the vibration absorption function.

However, in the conventional rolling insulator described above, the communication passage 7 of the partition wall 10 and the communication opening 12 of the rotary valve 11 are both connected to the rotary valve 11.
Since the rotary valve 9 is rotatably operated and the communication path 7 and the communication opening 12 are set to be long in the direction of the central axis of the When narrowing the cross-sectional area of the formed working fluid flow path, especially in the area where the cross-sectional area is narrowed to nearly 0 ^mm2 , it is impossible to adjust with precise precision.
It becomes impossible to maintain stable vibration absorption function.

In view of the above-mentioned problems in conventionally used rolling insulators, the present invention provides a partition wall that is arranged between both supporting members and forms a working fluid chamber between the two supporting members. The orifice, which is a small hole that communicates the chambers, is provided at a different position from the communication passage and the valve insertion hole into which the rotary valve is inserted, so that the cross-sectional area of the working fluid flow path due to the communication passage in the partition wall and the communication opening of the rotary valve is minimized. If it is to be maintained, the cross-sectional area can be maintained with high precision by completely closing the working fluid flow path formed by the communication passage and the communication opening so that the working fluid communicates only with the orifice of the small hole. This is intended to ensure the reliability of the vibration absorption function during operation when the vibration frequency is low.

Embodiments of the present invention will be described below with reference to the drawings. In the embodiment shown in FIG. 3, an orifice 15 is provided at a position apart from the communication passage 7 and the valve insertion hole 9 in the partition wall 10, and communicates both the working fluid chambers 14, 14.
is bored, and the communication passage 7 of the partition wall 10 and the rotary valve 11
Even when the working fluid passage formed by the communication opening 12 is completely closed by the rotary valve 11, the working fluid chambers 14, 14 are configured to communicate with each other.

As described above, the rolling insulator of the present invention includes an elastic member made of a rubber-like elastic material, a center boss integrally baked in the center of the elastic member, and a case integrally baked on the outer peripheral side of the elastic member. Becomes,
Two support members are connected to each other and connected to one of the engine and the support, and a working fluid chamber is formed between the two support members by being arranged between the two support members, and the support member is connected to the engine and the support. a partition wall connected to the other side, a small orifice is bored in the partition wall to communicate the working fluid chambers formed on both sides, and the partition wall is inserted into the communication passage provided in the partition wall and the partition wall. Even if the working fluid flow path formed by the communication opening of the rotary valve is completely blocked, the working fluid chambers on both sides of the partition wall can be
Since they are configured to communicate with each other, the vibration damping function is accurately maintained during low-frequency rocking, where the communication path between the two working fluid chambers should be kept narrow, which has a practical effect. is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of a conventional rolling diaphragm, and Fig. 2 is a cross-sectional view showing the structure of a conventional rolling diaphragm.
FIG. 3 is a partial sectional view at the same position as FIG. 2 of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Elastic member, 2... Center boss, 3... Case, 5... Support member, 7... Communication path, 9... Valve insertion hole, 10... Partition wall, 11... Rotary valve, 12...
...Communication opening, 14... Working fluid chamber, 15... Orifice.

Claims (1)

[Scope of utility model registration request] an elastic member 1 made of a rubber-like elastic material;
A center boss 2 coupled to the elastic member 1 and a case 3 coupled to the outer circumferential side of the elastic member 1 are arranged facing each other, connected to each other, and coupled to either the machine base or the supported body. The two support members 5, 5 are substantially disk-shaped and are arranged between the two support members 5, 5, and a working fluid chamber 14, 14 is formed between each of the support members 5, 5, respectively. death,
A rolling in which has a partition wall 10 connected to the other of the machine base and the supported body through a connecting means attached to the side, and both working fluid chambers 14, 14 are filled with working fluid. In the oscillator, the partition wall 10 extends in the direction of a central axis connecting the supporting members 5, 5, and the working fluid chambers 14, 1.
4 and an orifice 15 and a valve insertion hole 9 extending in a direction intersecting the central axis, the communication opening 12 is formed in a rod-shaped body with a circular cross section and intersects with the central axis of the rod-shaped body. A rolling insulator in which a rotary valve 11 having a hole therein is rotatably inserted into the valve insertion hole 9.