JPS625373Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to engine mounting for automobiles.

2. Description of the Related Art Engines for driving automobiles are usually supported on the vehicle body through engine mountings made of an elastic material such as rubber. The role of engine mounting here is, on the one hand, to prevent the vibrations of the engine from being transmitted to the vehicle body, and on the other hand, on the other hand, the role of engine mounting is to prevent the transmission of force from the vehicle suspension mechanism, and especially to the so-called front-wheel drive (FF), where the engine is mounted in the front and drives the front wheels. In a car, the purpose is to prevent the engine from moving excessively due to the reaction force of the driving torque. However, to fulfill the first role, the engine mounting needs to be as soft as possible (low damping), while to fulfill the second role it must be sufficiently stiff (high damping). Conventional engine mounting cannot satisfy these two mutually contradictory requirements at the same time, and as a result, muffled noise and large idle vibrations occur in connection with the first role, and engine It has not been possible to solve either or both of the problems of large movements and poor ride comfort and drivability.

The purpose of this invention is to provide an automobile engine mounting in which the spring constant (damping force) can be changed arbitrarily, and to reduce idling vibration by lowering the spring constant (damping force) when the vehicle is stopped (idling). On the other hand, while driving, the spring constant (damping force) is increased to prevent excessive engine movement, and in the engine speed range where muffled noise becomes a problem, the spring constant (damping force) is lowered again to improve muffled noise. be.

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

An engine mounting 10 shown for comparison in FIG. 1 supports an engine 20 on a vehicle body (not shown), and includes a pair of plates 1, 1' made of a rigid body such as steel;
It includes a cylindrical elastic body 2 held between 1'. The plate 1 is screwed to an appropriate location on the engine 20 via bolts 6 protruding from the plate 1, and the plate 1' is screwed to an appropriate location on the vehicle body via bolts 6' extending from the plate 1. The elastic body 2 is made of oil-resistant rubber, plastic, or the like, and is formed into a cylindrical shape as in the illustrated embodiment or a cylindrical shape with an appropriate cross-sectional shape, and has a cavity 3 formed inside. Here, the elastic body 2 and the plates 1, 1' are connected in a liquid-tight manner. Cavity 3 of cylindrical elastic body 2
As in the illustrated embodiment, it is desirable that the elastic member 2 extends in the direction in which the elastic body 2 exerts a damping effect, that is, in the vertical direction in the drawing in which the bolts 6 and 6' extend. One oil hole 4 is bored in the plate 1, and the cavity 3 of the elastic body 2 is communicated with the outside. The cavity 3 is further connected to the oil of the engine 20, which forms a forced hydraulic oil supply system by means of a two-way solenoid valve 5, via one pipe joint 7 and one pipe 8 screwed onto the plate 1. It is selectively communicated with either a pump (not shown) or an oil pan (not shown) of the engine 20, which is a reservoir for hydraulic oil.

The two-way solenoid valve 5 is normally located at the position shown in the figure, and a vehicle speed sensor (not shown) detects that the vehicle is running, and at the same time, an engine speed sensor (not shown) detects muffled noise. When it is detected that the engine speed is outside the engine speed range, the solenoid is energized and the two-way switching solenoid valve 5 is switched, and the engine oil pump (not shown) is connected to the cavity 3 through piping 8 and piping 9, which is the pressurized oil supply source. figure)
of pressure oil is supplied.

In this way, when the solenoid is energized and the solenoid valve 5 moves to the left in FIG. Elastic body 2 is made by pressurized oil.
becomes tensed and hard (with large damping). On the other hand, when the solenoid is not energized and the solenoid valve 5 is in the position shown in Figure 1, the piping 9 is closed and the pressurized oil in the cavity 3 is returned to the oil pan through the piping 8, 9', so the elastic body 2 becomes soft ( Attenuation is also small). Hardness of the elastic body (damping force) when no hydraulic pressure is applied here
The stiffness of the elastic body (damping force) when hydraulic pressure is applied is selected so as not to cause the problems of muffled noise and idle vibration mentioned above, and the stiffness of the elastic body (damping force) is selected so as not to cause the problems of ride comfort and drivability mentioned above. Make your selection. Therefore, when the engine is idling and stopped or in a specific engine speed range where muffled noise is a problem, the solenoid is not energized and the elastic body 2 is made sufficiently soft (with less damping) to eliminate idle vibrations and muffled noise. Under running conditions, the solenoid is energized to make the elastic body 2 harder (and increases damping), thereby improving ride comfort and drivability.

In FIG. 2, an engine mounting 30 according to an embodiment of the present invention supports an engine 20 on a vehicle body (not shown), and includes a plate 11 made of a rigid body such as steel, and is spaced from the plate 11. A housing 12 having a cylindrical space inside and also made of a rigid body such as steel, a cylindrical elastic body 13 made of rubber, plastic, etc., sandwiched between the plate 11 and the housing 12;
The plunger 15 is made of a rigid body such as steel and can be fitted into a cylindrical hollow part 14 extending in the vertical direction in the figure, in which the elastic body 13 acts as a damper. The plate 11 is screwed onto the engine 20 by bolts 23 protruding from the plate 11. Note that the small hole 21 passing through the bolt 23 in the axial direction is used to vent air from the space 14 of the cylindrical elastic body 13. A bolt 22 protruding from the lower end of the housing 12 is screwed onto the vehicle body. As described above, the housing 12 has a cylindrical space inside, and the sealing O-ring 2 is installed in the space.
4, the piston 16 is fitted in a sealed manner so as to be slidable in the vertical direction in the figure. The lower end of the plunger 15 and a piston 16 are integrally connected, and the plunger 15 is moved up and down as the piston 16 moves up and down. A compression spring 17 is installed in the upper chamber between the upper surface of the piston 16 and the top plate of the housing 12 to constantly prepress the piston 16 and communicate the upper chamber with the outside through the small hole 25 to drain the air inside the upper chamber. I'm trying to get through it. The cylinder chamber 18 between the piston 16 and the bottom plate of the housing 12 is connected via one pipe 19 to the oil pump (not shown) of the engine 20, which is a forced supply source of hydraulic oil, by means of a two-way switching solenoid valve 5'. Alternatively, it is selectively communicated with either one of the oil pan (not shown) of the engine 20, which is a reservoir for hydraulic oil. The oil pump and oil pan form a hydraulic supply circulation system.

The above-mentioned two-way switching valve 5' is in the illustrated position when not energized, and in this state, the pipe 26' is closed and pressurized oil is supplied to the cylinder chamber 18 from the oil pump via the pipes 26 and 19. . If the vehicle speed detector (not shown) detects that the vehicle is stopped (idling) or that the engine speed is in a range where muffled noise is likely to occur, the engine speed detector (not shown) is detected, the solenoid is energized and the two-way switching solenoid valve 5' moves downward in the figure to close the pressurized oil supply circuit 2.
6 is cut off, the cylinder chamber 18 is connected to the pipe 1.
It communicates with the oil pan via 9, 26'.

Here, the cylinder chamber 18, plunger 15, housing 12, piston 16, cavity 14, etc. are cylindrical,
It does not have to be disc-shaped, and the operation of the two-way solenoid valve 5' may be reversed to that described above.

With the above configuration, when the engine is idling or stopped or in a specific engine speed range where muffled noise is a problem, the plunger 15 is pushed up by hydraulic pressure and expands the hollow part 14, so the elastic body 13 becomes hard, but under other driving conditions. Since the cylinder chamber 18 communicates with the oil pan, the piston 16 is connected to the spring 17.
At the same time, the plunger 15 is also pulled out of the hollow portion 14 and the elastic body 13 becomes soft. The stiffness of the elastic body when the plunger is not inserted is selected so that the aforementioned muffled noise and idle vibration do not become a problem, and the stiffness of the elastic body when the plunger is inserted is selected to match the ride comfort and driver described above. The selection should be made in such a way that stability problems will not occur. Therefore, when the engine is idling and stopped or at engine speeds where muffled noise is a problem, the elastic body 13 is made sufficiently soft to eliminate idling vibrations and muffled noise, while under other driving conditions, the elastic body 13 is made sufficiently hard to improve riding comfort. , drivability can be improved.

The switching valves 5, 5' shown in FIGS. 1 and 2 are as follows:
The hydraulic circuits 8 and 19 of the engine mountings 10 and 30 are engine oil pumps (not shown).
When the hydraulic circuits 9', 26' on the oil pan (not shown) side are closed, the hydraulic circuits 8, 19 of the engine mountings 10, 30 are connected to the engine oil pan (not shown). When connected, the hydraulic circuits 9 and 26 on the oil pump (not shown) side
Since the valve is closed, there is no risk of a drop in the oil pressure of the engine itself, and therefore, there is no hindrance to the operation of the engine.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of an engine mounting for an automobile shown for comparison, and FIG. 2 is a schematic diagram showing an engine mounting for an automobile according to an embodiment of the present invention. 10... Engine mounting, 20... Engine, 1, 1'... Plate, 6, 6'... Bolt, 2... Elastic body, 3... Cavity, 4... Oil hole, 7
... Pipe fitting, 5 ... Two-way switching solenoid valve, 8, 9,
9'...Piping.

Claims (1)

[Claims for Utility Model Registration] 1. In an engine mounting made of an elastic body for supporting an engine on a vehicle body, a rigid plunger 15 is fitted into a hollow part 14 extending in the damping direction inside the elastic body 13, The plunger 15 is configured to be able to be moved in and out of the elastic body 13 depending on the operating condition of the engine, and the plunger 15 is connected to a piston 16 slidably provided in a hydraulic cylinder chamber 18, and 18 is a pipe 5' having a switching valve 5';
26, 26' for an automobile, characterized in that the piping is configured to selectively communicate with either a pressurized hydraulic oil supply source or a hydraulic oil reservoir, and the other piping that is not in communication is closed. engine mounting. 2. The engine mounting according to claim 1, wherein the switching valve 5 is controlled to open and close according to engine speed and/or vehicle speed.