JPS60116937A - Vibration-proof supporting method of internal- combustion engine for car - Google Patents

Abstract

PURPOSE:To improve the comfortability and silentness of car by reducing the dynamic spring constant under quite low speed travel such as retardation or idling thereby preventing transmission of low amplitude vibration to the chassis. CONSTITUTION:A vibration-isolating rubber system is provided with chamber spaces 21, 23 containing viscous liquid where a solenoid system 29 and a valve element 25 movable through a compression spring 33 are arranged in said spaces 21, 23. Under non-sucking state of solenoid system 29, said spaces 21, 23 are communicated while under sucked state, they 21, 23 are partitioned by means of the valve element 25 and communicated through a restriction path made in the valve element 25. Power supply to the solenoid system 29 is stopped only when the car speed to be detected through a car speed sensor is lower than specific level, for example 15km/h, and the rotation of internal-combustion engaine to be detected through rotation sensor is lower than specific level, for example 1,500rpm.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a vibration-proof support method for elastically supporting an internal combustion engine from a vehicle body in a vehicle such as an automobile, and further relates to a vibration-proof support method for elastically supporting an internal combustion engine from a vehicle body. The present invention relates to a vibration damping support method for elastically supporting an internal combustion engine on a vehicle body using a variable control type vibration damping rubber device.

BACKGROUND OF THE INVENTION In vehicles such as automobiles, in order to improve ride comfort and quietness by reducing vehicle body vibration and vehicle interior noise caused by vibration of the internal combustion engine mounted on the vehicle against the vehicle body. It has been conventional practice to provide anti-vibration support for internal combustion engines from the vehicle body using vibration-isolating rubber devices. Variable control type vibration isolating rubber device was applied for in 1973.
No. (Sho 58-1 '01 '031), patent application No. 1973
Various proposals have been made in U.S. Pat.

The variable control type anti-vibration rubber device as described above has a small dynamic spring constant in order to effectively reduce small-amplitude vibrations that cause idling vibrations and slight vibrations of the vehicle body during idling operation and extremely low speed driving. During general driving, the dynamic spring constant is increased in order to effectively dampen relatively large amplitude vibrations such as engine shake, which works effectively during both idling and cruising. If this variable control of the dynamic spring constant is not performed appropriately, the ride comfort and quietness of the vehicle may deteriorate.

Purpose of the Invention The present invention uses a variable control type anti-vibration rubber device in which the dynamic spring constant changes, and appropriately controls the dynamic spring constant of the vibration isolating rubber device to improve ride comfort and quietness of a vehicle. An object of the present invention is to provide a vibration-proof support method for supporting an internal combustion engine from a vehicle body in a vibration-proof manner.

According to the present invention, the above-mentioned object is to provide a vibration-proof support method for elastically supporting an internal combustion engine from a vehicle body using a variable control type vibration-proof rubber device whose dynamic spring constant changes. The vehicle speed and the rotational speed of the internal combustion engine are detected, and when the vehicle speed is less than a predetermined value and the rotational speed of the internal combustion engine is less than a predetermined value, the dynamic spring constant of the variable control type anti-vibration rubber device is adjusted compared to other times. This is achieved by a vibration-proof support method for a vehicle internal combustion engine, which is characterized by reducing the size of the engine.

Effects of the Invention According to the present invention, when the vehicle speed is below a predetermined value and the rotational speed of the internal combustion engine is below a predetermined value, the anti-vibration rubber device does not operate when the vehicle is running at a very low speed such as during heavy traffic or when idling. The spring constant becomes smaller, effectively preventing small-amplitude vibrations of the internal combustion engine, so-called micro-vibrations, which are a problem in these cases, from being transmitted to the vehicle body, and in addition to this, the dynamic spring constant of the anti-vibration rubber device increases This effectively prevents the internal combustion engine from shaking significantly with respect to the vehicle body, such as engine shake.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail with reference to embodiments with reference to the accompanying drawings.

FIG. 1 shows one embodiment of the vibration-proof support method for a vehicle internal combustion engine according to the present invention. In FIG. 1, 1 indicates an internal combustion engine, and 2 indicates a transmission, both of which are connected in series when viewed from their rotational axes, and are an assembly of the internal combustion engine 1 and transmission 2. 3 is the axis direction (left and right direction in the figure)
Both ends of the assembly are supported by the vehicle body 6 on the main axis of inertia Jr of the rolling motion of the assembly by vibration isolating rubber devices 4 and 5 having the main axis of inertia on the center of inertia, and both front and rear sides are supported as the main axis of inertia of the rolling motion of the assembly. The center of gravity G of the assembly with respect to 1r
It is supported from the vehicle body 5 by anti-vibration rubber devices 7 and 8 whose elastic centers are located on the main axis of inertia It) of the pitching motion, which is orthogonal to the main axis of inertia It.

The anti-vibration rubber devices 4 and 5 are constituted by general bush-type anti-vibration rubber devices, and the anti-vibration rubber devices 7 and 8 are constituted by variable control type anti-vibration rubber devices as shown in FIG. ing.

Next, one embodiment of a variable control type anti-vibration rubber device used in the anti-vibration support method according to the present invention will be described with reference to FIG. The vibration isolating rubber device has two frames 11 and 12. The frame 11 is constituted by a single plate member, and a mass member 11a is attached to the frame 11. The frame 12 is constituted by an assembly of a cylindrical portion "U13, an annular member 14, and a bottomed cylindrical portion 015 that are fastened to each other by bolts 16. The frame 11 has mounting ports 1 to 17.
The frame body 12 is fixedly connected to the internal combustion engine 1 by means of a bottomed cylindrical member 15, and the frame body 12 is fixedly connected to the vehicle body 6 by a mounting bolt 18.

A rubber-like elastic member 20 made of rubber or rubber-like material and having an annular wall portion 19 is provided between the frame body 11 and the cylindrical member 13 of the frame body 12. The frame body 11 and the cylindrical member 13 are elastically connected to each other. The rubber-like elastic member 20 cooperates with the annular member 14 inside the cylindrical member 13 to define a chamber space 21 . The annular member 14 has a relatively large opening 22 in its center, and the chamber space 21 communicates with another chamber space 23 through the opening 22 . The chamber space 23 is defined by a die A7 flamm 24 on the opposite side of the chamber space 21 across the annular member 14, and the chamber space and the chamber space 21 are each filled with a liquid having an appropriate viscosity. has been done.

A plate-shaped valve element 25 is stepped in the chamber space 21, and the valve element is selectively seated on a valve seat 26 around the opening 22 by moving vertically in the figure. opening 2
2 can be selectively closed. The valve element 25 has a throttle passage 27 which is opened on both plate surfaces, and the throttle passage is connected to the chamber spaces 21 and 23 even when the valve element 25 is seated on the valve seat part 26 and closes the front part 22. and are connected to each other).

The valve element 25 integrally has a valve shaft 28, to which a suction plate 30 of a solenoid device 29 provided in the bottomed cylindrical member 15 is fixed with a screw 31. When the electromagnetic coil 32 is energized and excited, the solenoid device 29 attracts the adsorption plate 30 downward as shown in the figure against the spring force of the compression coil spring 33, and the valve element 25 is moved downward as shown in the figure. On the other hand, when the electromagnetic coil 32 is not energized and is demagnetized, the adsorption plate 3 is moved by the spring force of the compression coil spring 33.
0 is pushed upwards in the figure by %f, which drives the valve element 25 to a closed position where it is away from the valve seat 26.

The electromagnetic coil 22 of the solenoid device 29 is energized by an electrical control device 34 as shown in FIG. The control device 34 is the vehicle speed sensor 3
5 and information regarding the rotation speed of the internal combustion engine 1 from the rotation speed sensor 36, and the vehicle speed detected by the vehicle speed sensor 35 is set to a predetermined value, for example, 15 km/l.
energization to the electromagnetic coil 32 is stopped only when the rotation speed of the internal combustion engine 1 detected by the rotation speed sensor 36 is below a predetermined value, for example, 1500 rpm+, and at other times, the electromagnetic coil 32 is energized. It looks like this.

As described above, by controlling the energization of the electromagnetic coil 32 by the control device 34, when the vehicle speed is 15 km/h or less and the rotation speed of the internal combustion engine 1 is 150 Q rpm or less, that is, when driving at extremely low speeds such as when driving in traffic jams. During driving or idling, the valve element 25 is separated from the valve seat 26 and the opening 2
2 opens, and the liquid in the chamber space 21 flows through the opening into the chamber space 2.
3, the dynamic spring constant and viscous damping coefficient of the vibration isolating rubber devices 7 and 8 are reduced, and the minute vibrations of the internal combustion engine 1 and transmission 2, which are problematic at this time, are not transmitted to the vehicle body. Prevented.

Vehicle speed is 15 km/h or more or engine speed is 15 o o
When rp+n or more, that is, during normal driving, the valve element 25 is seated on the valve seat 26, the opening 22 is closed, and the liquid in the chamber space 21 is prevented from entering and leaving the chamber space 23 only through the throttle passage 27. The dynamic spring constant and viscous damping coefficient of the vibrating rubber devices 7 and 8 are increased, and large-amplitude vibrations such as engine shake are effectively damped.

The control device 34 receives information regarding the vehicle speed from the vehicle speed sensor 35 and information regarding the rotation speed of the internal combustion engine 1 from the rotation speed sensor 136, as well as information regarding starting and stopping of the internal combustion engine 1 from the key switch 37 of the internal combustion engine 1. is given, and when the internal combustion engine 1 starts and stops, the electromagnetic coil 32
The device may be configured to be energized only for a predetermined period of time.

In this case, when the internal combustion engine 1 is started and stopped, the valve element 25 is seated on the valve seat 26 for a predetermined period of time, and the opening 22 is closed, thereby preventing the vibration damping rubber devices 7 and 8 from moving. The constant and viscous damping coefficient are increased, reducing the phenomenon called J3 tremor, where the assembly 3 of the internal combustion engine 1 and transmission 2 swings greatly relative to the vehicle body due to large torque fluctuations of the internal combustion engine. be done.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto.
It will be apparent to those skilled in the art that various other embodiments are possible within the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing one embodiment of the vibration-isolating support method for a vehicle internal combustion engine according to the present invention, and FIG. 2 is a variable control control used in the vibration-isolating support method for a vehicle internal combustion engine according to the present invention. Vertical sectional view showing one embodiment of the type vibration isolating rubber device, No. 3
The figure is a block diagram showing a control system used to implement the vibration-proof support method for an internal combustion engine for a vehicle according to the present invention. 1... Internal combustion engine, 2... Transmission, 3... Assembly,
4, 5... Anti-vibration rubber device, 6... Vehicle body, 7.8...
・Variable control type anti-vibration rubber device, 11.12...Frame body, 1
3... Cylindrical member, 14... Annular member, 15... Bottomed tubular member, 16... Pol h, 17.18... Mounting bolt, 19... Annular wall portion, 20 ... Rubber-like elastic member, 21 ... Chamber space. 22...11 mouth part, 23...chamber space, 24...die 17 noram, 25...valve element, 26...valve seat part,
27... Throttle passage, 28... Valve stem, 29... Solenoid device, 30... Adsorption plate, 31... Screw, 32
...i5 magnetic coil, 33...compression coil spring, 3'
4...Control device, 35...Vehicle speed sensor, 36...
Rotation speed sensor, 37...Key switch Patent applicant Toyota Motor Corporation 11 Representative Patent attorney Masatake Akashi Figure 1 Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] In an anti-vibration support method that elastically supports an internal combustion engine from the vehicle body using a variable control anti-vibration rubber device with a variable dynamic spring constant, the vehicle speed and the rotational speed of the internal combustion engine are detected, and the vehicle speed is set to a predetermined value. When the rotational speed of the internal combustion engine is below and the rotation speed of the internal combustion engine is below a predetermined value, the dynamic spring constant of the variable control type anti-vibration rubber device is made smaller than at other times. Support method.