JPH061145U - Vibration reduction device for cab - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress low-frequency vibration of the cab as much as possible. A water tank 28 is installed below a nap bed 24 provided behind the driver's seat 20 and the passenger seat 22 of the cab 12 and filled so that the water inside can be swung. When the vibration is transmitted to the cab 12, the water in the water tank 28 moves in the direction opposite to the vibration direction to damp the vibration.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for reducing vibration of a cab of a cab-over type vehicle.

[0002]

[Prior art]

 The cab of a cab-over vehicle uses a spring and a shock absorber to reduce the vibration transmitted from the road surface to the driver's seat.

[0003]

[Problems to be solved by the device]

 Some large cab-over trucks employ a so-called cab suspension that has an elastic support structure between the frame and the cab in order to reduce vibration from the road surface during traveling. However, if only the spring and the shock absorber of the prior art are used, the cab may oscillate left and right or front and back at a relatively low cycle during traveling, and improvement of this is required.

An object of the present invention is to provide a vibration reducing device for a cab, which avoids the above-mentioned drawbacks and can suppress the vibration transmitted from the frame to the cab as much as possible.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is installed under a nap bed provided in the rear of a cab and a passenger seat of a cab-over type vehicle so that water inside can be swung. The present invention provides a vibration reducing device for a cabin, which is characterized by comprising the tank-shaped vibration suppressing means described above.

[0006]

[Action]

 Thus, when the tank-shaped vibration suppressing means is installed in the cab, the vibration of the cab is attenuated by the movement of water in the tank of the vibration suppressing means, and the tank-shaped vibration suppressing means is installed under the nap bed. Therefore, it can be easily installed in the cab without changing the structure of the cab.

[0007]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a cab 12 equipped with a vibration reducing device 10 for a cab according to the present invention. It is supported by 14 via a spring 16 and a shock absorber 18. The cab 12 has a nap bed 24 that is provided behind the driver's seat 20 and the passenger seat 22.

The cab vibration reducing apparatus 10 of the present invention is installed symmetrically with respect to the widthwise center of the cab 12 inside the cab 12 under the nap bed 24 and is filled so that the water inside can be swung. And a tank-shaped vibration suppressing means 26.

In the illustrated embodiment, the tank-shaped vibration suppressing means 26 is composed of one water tank 28 continuous in the width direction of the cab 12, and a water supply port is provided at one corner thereof, as can be seen from FIGS. 2 and 3. Have 30. The amount of water supplied to the water tank 28 is about 70 to 80% of the capacity of the water tank 28, but it needs to be adjusted depending on the vibration state of the vehicle.

As described above, when the water tank 28 is installed symmetrically with respect to the center of the cab 12, the lateral and longitudinal vibrations of the cab 12 are caused by the movement of water in the water tank 28. Is attenuated.

Further, since the tank-shaped vibration suppressing means 26 moves in the water tank 28 in order to damp the vibration of the cab, the movement of this water causes a sound of water bouncing in the water tank 28. In order to suppress the sound of water splashing, it is preferable to have a sound insulation layer 32 attached to the inner surface or the outer surface of the water tank 28, as shown in FIG.

In the embodiment shown in FIGS. 1 and 2, the tank-shaped vibration suppressing means 26 is composed of one water tank 28. However, as shown in FIG. It may consist of two or more water tanks 28A, 28B arranged symmetrically, and these water tanks 28A, 28B may be connected to each other by a connecting pipe 34.

[0013]

[Effect of device]

 According to the present invention, as described above, since the tank-shaped vibration suppressing means is installed in the cab, the vibration of the cab is damped by the movement of the water in the tank of the vibration suppressing means, and accordingly, during running or idling. The vibration transmitted to the cab can be suppressed, and because this tank-shaped vibration suppression means is installed under the nap bed, it can be easily installed in the cab without changing the structure of the cab. There is a real benefit.

[Brief description of drawings]

FIG. 1 is a side view of a cab provided with a vibration reduction device according to the present invention.

FIG. 2 is a cross-sectional view of a vibration reducing device for a cab according to the present invention.

FIG. 3 is a sectional view of a tank-shaped vibration suppressing means used in the present invention.

FIG. 4 is a sectional view of a different example of the tank-shaped vibration suppressing means used in the present invention.

[Explanation of Codes] 10 Cab Vibration Reduction Device 12 Cab 14 Frame 16 Spring Suspension 18 Shock Absorber 20 Driver's Seat 22 Passenger Seat 24 Napping Bed 26 Tank-Shaped Vibration Suppression Device 28 Water Tank 28A Water Tank 28B Water Tank 30 Water Supply Port 32 Sound Insulation Layer 34 Connection pipe

Claims (1)

[Scope of utility model registration request] 1. A tank-shaped vibration suppressing means installed below a nap bed provided behind a driver's seat and a passenger seat of a cab of a cab-over type vehicle and filled so that water inside can be swung. A vibration reduction device for the cab.