JPS61165041A - Engine support damper - Google Patents

Abstract

PURPOSE:To make it possible to absorb even slight vibration, by providing a support plate which is set near to the inner periphery of a cylinder with a slight gap being left therebetween, integrally with an attaching support section and by bridging the gap between the outer periphery of the support plate and the inner periphery of the cylinder with the use of a rubber member. CONSTITUTION:An attaching support section 17 is fixed by baking to the center part of each of rubber member 12 which are fixed by baking to a body container 10 to close both ends of a cylinder 11. The body container 10 is fixed to support bracket 9 through the attaching support sections 17 by means of bolts 18. The attaching support section 17 has at its center fixing parts 17a into which bolts 18 are screwed, and is integrally incorporated with large diameter disc-like support plates 17b therearound. Each support plate 17b is fixed by baking to the rubber member 12, and the outer periphery of the plate 17b is set near to the inner periphery of the cylinder 11 with a slight gap being left therebetween. This gap is closed by the rubber member 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a damper interposed between an engine and a vehicle body frame in order to vibration-proofly support the engine on the vehicle body frame.

[Prior art]

Some vehicles have a damper interposed between the engine and the body frame in order to provide vibration isolation for the vehicle body on which the engine is mounted. This damper has two oil chambers that communicate with each other through a throttle hole inside the cylinder, and the end side wall surface of the oil chamber is made of rubber K, and is attached to the engine or vehicle body frame to this rubber plate. The structure is such that a mounting support section is provided.

However, although the damper with the above structure works effectively against vibrations with relatively large amplitudes, which are targeted for vibration isolation in passenger cars,
For very small vibrations with an amplitude of about 1 to 2 mm, the rubber plate does not have enough rigidity, so it cannot exhibit a sufficient vibration damping effect.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an engine support damper that can dampen even minute vibrations of about ±1 to 2 mm.

[Structure of the invention]

The present invention achieves the above object by forming two oil chambers in a cylindrical body that communicate with each other through a throttle hole, and forming the end side wall surface of the oil chamber from a rubber material. In an engine supporting damper provided with a mounting support part, a support plate is integrally provided in the mounting support part adjacent to the inner periphery of the cylindrical body with a slight gap left, and the outer periphery of the support plate and the inner periphery of the cylindrical body are integrally provided. The invention is characterized in that the gap between the two is connected by the rubber material.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

In the motorcycle shown in FIG. 2, 1 is a body frame, and 2 is an engine mounted on this body frame l. The engine 2 has a piston 4 that reciprocates within a cylinder 3, and the piston 4 drives a crankshaft 5 within a crankcase 6. This engine 2 is elastically supported at the front and rear of a crankcase 6 via an elastic material 7 such as rubber, and the head of the cylinder 3 is supported by a damper 8 according to the present invention. The damper 8 is designed to dampen vibrations of the engine 2 in the direction of arrow A.

As shown in FIG. 1, the damper 8 supports a main container 10 on a U-shaped support bracket 9. The support bracket 9 has attachment parts 9a, 9a for the engine 2.
The main body container 10 is also provided with an attachment portion 10a for attaching to the vehicle body frame l.

In the main body container 10, disk-shaped rubber members 12 and 12 are fixed by baking so as to close both ends of the cylindrical body 11, and a mounting support portion 17 is fixed by baking to the center of each rubber member 12. The main container 10 is fixed to the support bracket 9 with bolts 18 via this mounting support portion 17 . The mounting support part 17 has a fixing part 17 screwed into the bolt 18 at the center.
a, and around it a disk-shaped support plate 17 with a large outer diameter.
b are fixed together. The support plate 17b is fixed to the rubber material 12 by baking, and its outer periphery is close to the inner periphery of the cylindrical body 11 to the extent that a slight gap is left. The gap is closed by the rubber material 12.

In order to form the above-mentioned slight gap, the area that the support plate 17b occupies with respect to the inner cross-sectional area of the cylinder 11 is preferably 7.
It is good to set it to 5-90%, more preferably 80-90%.

As shown in FIG.
The support plate 17b and the support plate 17b may be formed integrally. Further, the rubber material 12 may not be provided over the entire end portion of the cylinder 11, but may be provided only in a portion that closes a small gap between the outer periphery of the support plate 17b and the inner periphery of the cylinder 11.

The internal space of the cylindrical body 11 is partitioned by a partition plate 13 into two oil chambers 14a and 14b.

The partition plate work 3 is provided with a throttle hole 15 and a switching valve 16, and through the throttle hole 15 and the switching valve 16, both oil chambers 14a are connected to each other.
, 14b communicate with each other. However, the switching valve 16 is configured to be alternately switched between an open state shown by a solid line and a closed state shown by a chain line.

Therefore, when the engine vibration in the direction of arrow A is applied to the damper 8, if the switching valve 16 is in the closed state, the oil in both oil chambers 14a and 14b moves through the throttle valve 15, so the large flow resistance causes a large A damping force is generated, but when the switching valve 16 is open, oil moves through the flow path of the switching valve 16 with a large cross-sectional area, so the flow resistance is small and no large damping force is generated. Opening/closing of the switching valve 16 may be appropriately selected depending on the operating condition G of the engine 2.

In conventional engine supporting dampers used in passenger cars and the like, the support plate 17b of the mounting support portion 17 described above is not provided. Therefore, the rigidity of the disk-shaped rubber material 12 is relatively low, and it does not exhibit a sufficient damping effect against micro vibrations of about ±1 to 2 mm.

However, in the case where the support plate 17b is provided close to the inner circumference of the cylindrical body 11 with a slight gap left as in the present invention, the rubber material 1 is able to withstand engine vibrations applied to the mounting support part 17.
Increase the rigidity of 2. Therefore, the damping force is improved by 4 to 5 times, and a high damping effect can be exhibited even against the above-mentioned minute vibrations.

〔Effect of the invention〕

As described above, the present invention forms two oil chambers in a cylindrical body that communicate with each other through a throttle hole, and forms the end side wall surface of the oil chamber with a rubber material. In an engine supporting damper provided with a mounting support part, a support plate is integrally provided in the mounting support part adjacent to the inner periphery of the cylindrical body with a slight gap left, and the outer periphery of the support plate and the inner periphery of the cylindrical body are integrally provided. Since the gap between the two parts is connected by the rubber material, the rigidity of the rubber material that receives engine vibration through the mounting support part is improved, and even slight vibrations of about ±1 to 2 mm can be damped. become.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a damper according to an embodiment of the present invention, and FIG.
The figure is a side view of a motorcycle in which an engine is supported by the same damper, and FIG. 3 is a longitudinal cross-sectional view showing essential parts of a damper according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Vehicle body frame, 2... Engine, 8... Damper, 11... Cylindrical body, 12... Rubber material, 13...
・Partition plate, 14a, 14b-oil chamber, 15... Throttle hole, 17... Mounting support part, 17a... Fixing part,
17b...Support plate, 18...Bolt.

Claims (1)

[Claims] For engine support, two oil chambers that communicate with each other through a throttle hole are formed in a cylindrical body, the end side wall surface of the oil chamber is made of a rubber material, and a mounting support is provided on the rubber material. In the damper, a support plate is integrally provided in the mounting support portion adjacent to the inner periphery of the cylindrical body with a slight gap left, and the gap between the outer periphery of the support plate and the inner periphery of the cylindrical body is filled with the rubber material. An engine support damper characterized by being connected by.