JPS6332436Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a rubber mounting device for an engine, and in particular, it is attached to a liquid chamber provided inside the rubber mounting via a microcomputer based on the output signals of a road surface displacement sensor and a temperature sensor. control the on/off of the heater
The present invention relates to a rubber mounting device for an engine that changes a spring constant of the rubber mounting according to a change in thermal expansion of a liquid contained in the liquid chamber.

Conventionally, when an engine is held in a frame, upper and lower plates are installed between the engine mounting bracket attached to the frame and the bracket attached to the bottom of the engine in order to reduce vibrations from the engine itself and from the axle. Bolts, with sandwiched rubber mountings in between.
Natsu connects the three. The spring constant of conventional rubber mountings was determined by the initial hardness and shape of the rubber, and could not be varied depending on the road surface conditions. However, the spring constant of the rubber mounting needs to be varied depending on the road surface conditions. For example, if you set the spring constant to a low value based on a good road, in other words, if you set the rubber mounting to be soft, on a good road the engine vibrations will be absorbed by the rubber mounting, the effect on the frame and cab will be small, and the ride will be comfortable, but On rough roads, engine vibrations cannot be absorbed and the amplitude increases, shortening the life of the rubber mounting and causing mutual interference between parts. This is because the mounting must be made firm.

This invention was made by paying attention to the need for such conventional technology, and by changing the spring constant of the rubber mounting based on the output signals of the road surface displacement sensor and the temperature sensor, the above-mentioned need was solved. It aims to solve the problem.

This invention will be explained below based on the drawings.

The figure shows an embodiment of this invention.

1 is a road surface displacement sensor that measures tire or frame vibration using an accelerometer.

2 is a microcomputer, which receives the output signal of the road surface displacement sensor 1 as an input.

Reference numeral 3 denotes a rubber mounting, and a liquid chamber 4 is installed inside the rubber mounting, and the liquid chamber 4 contains a liquid 5 having a large coefficient of thermal expansion, such as silicone oil, and a heater 6 and a temperature sensor 7. It is installed.

The heater 6 is connected to a power supply PN via a switch 8, and the on/off state of the switch 8 is controlled by the output signal of the microcomputer 2.

Temperature sensor 7 detects liquid 5 due to changes in outside temperature.
This is to notify the microcomputer 2 of the temperature change in the liquid chamber 4 and the corresponding change in the liquid pressure in the liquid chamber 4 and the spring constant of the rubber mounting 3, and its output signal is input to the microcomputer 2.

The relationship between the road surface displacement and the optimum spring constant of the rubber mounting 3, the relationship between the temperature of the liquid 5, the liquid pressure in the liquid chamber 4, and the spring constant of the rubber mounting 3, the energization time of the heater 6, and the rate of temperature rise of the liquid 5. etc. are determined through experiments and the like, and these relationships are combined and stored in the microcomputer 2. With respect to road surface displacement, a time element is incorporated in the microcomputer 2 so that the microcomputer 2 generates an output signal when a constant state continues for a certain period of time.

Note that a certain output signal of the road surface displacement sensor 1, for example, an output signal when driving on a paved road and a certain temperature,
For example, the optimum spring constant of the rubber mounting 3 and the liquid pressure of the liquid chamber 4 are set in advance based on 20°C. After setting, if the temperature of the liquid 5 changes due to changes in the outside air temperature, the heater 6 is turned on and off via the temperature sensor 7, microcomputer 2, and switch 8 so that the spring constant of the rubber mounting 3 is optimized. be done.

Next, the effect will be explained.

When a bad road is detected by the output signal of the road surface displacement sensor 1, the switch 8 is turned on by the output signal of the microcomputer 2, and the heater 6 is turned on.
When the liquid 5 is heated, it expands, the liquid pressure in the liquid chamber 4 increases, and the spring constant of the rubber mounting 3 increases. When this spring constant becomes optimal, the output signal from the microcomputer 2 turns off the switch 8, and no current flows to the heater 6.

Thereby, the spring constant of the rubber mounting 3 can be varied according to changes in the road surface.

As explained above, this idea uses the output signals of the road surface displacement sensor and temperature sensor to control the on/off of the heater attached to the liquid chamber provided inside the rubber mounting via a microcomputer. By changing the thermal expansion of the liquid contained in the liquid chamber, the spring constant of the rubber mounting can be varied, thereby achieving both low vibration on good roads and durability of the rubber mounting on rough roads. This has the effect of being able to.

[Brief explanation of drawings]

The figure shows an embodiment of this invention. 1...Road surface displacement sensor, 2...Microcomputer, 3...Rubber mounting, 4...Liquid chamber, 5...Liquid, 6...Heater, 7...Temperature sensor, 8...Switch.

Claims (1)

[Scope of utility model registration request] A liquid chamber is provided inside the rubber mounting,
A liquid with a large coefficient of thermal expansion is placed in the liquid chamber, and a heater and a temperature sensor are installed, and the heater is turned on and off by the output signal of a microcomputer that receives the output signals of the road surface displacement sensor and the temperature sensor. Controlled rubber mounting device for engines.