JPH0810072Y2 - Cab suspension system for vehicles with cab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement of a cab suspension device which is provided between a cab and a chassis frame of a cab-equipped vehicle and elastically supports the cab with a fluid. is there.

[Conventional technology]

The cab suspension device is composed of a fluid suspension such as an air suspension or a hydropneumatic suspension which is disposed between a chassis frame and a cab of a vehicle and elastically supports the cab (Japanese Patent Laid-Open No. 62-18374, Japanese Utility Model Publication No. 63-158482,
See Japanese Utility Model Publication No. 63-160279 and Japanese Utility Model Publication No. 63-160280).

[Problems to be solved by the device]

The prior art gab suspension system did not control the intake and exhaust of the fluid in the air suspension or the hydro new match suspension, so the cab maintains a certain height with respect to the chassis frame, and therefore the cab driver seat Since it is located at a high position, it was inconvenient for the driver to get on and off.

The purpose of the present invention is to avoid the above-mentioned drawbacks and to lower the cab toward the chassis frame when the driver gets on or off the driver's seat of the cab to make it convenient for the driver to get on and off. To provide a suspension device.

[Means for solving the problem]

In order to solve the above problems, the present invention relates to a cab suspension device including a fluid suspension arranged between a chassis frame and a cab of a vehicle, and a fluid suction valve connected to the fluid suspension and the fluid suction valve. The valve opening / closing means opens and closes.The valve opening / closing means opens the fluid intake / exhaust valve to the exhaust side when the cab door is opened while the transmission is in the neutral position or the parking brake is operating. The present invention provides a cab suspension device characterized by generating a command.

[Action]

Thus, when the cab fluid suspension is provided with a fluid intake / exhaust valve, when the driver gets on or off the cab, the fluid intake / exhaust valve is switched to the exhaust side to exhaust from the cab fluid suspension, and the driver When the passenger gets on and closes the door, the fluid intake / exhaust valve is normally controlled to maintain the set cab height, so that the cab is elastically supported on the chassis frame at a predetermined fluid pressure.

〔Example〕

Embodiments of the present invention will be described in detail with reference to the drawings.
The drawings show a cab suspension device 10 for a vehicle with a cab according to the present invention.
Consists of a fluid suspension 16 arranged between the chassis frame 12 and the cab 14 of the vehicle. In the illustrated embodiment, this fluid suspension is an air suspension in the form of a bellows, but it may also be a high rhodo pneumatic suspension.

The cab suspension device 10 of the present invention comprises a fluid intake / exhaust valve 20 connected between a fluid suspension 16 which is a bellows and a fluid supply source 18 such as an air tank, and a valve opening / closing means 22 for opening / closing the fluid intake / exhaust valve 20. I have it. The fluid intake / exhaust valve 20 has its inlet / outlet switched to the fluid supply source 18 or the exhaust side by the vertical displacement of the arm 20a. The valve opening / closing means 22 issues an opening command to open the fluid exhaust valve 20 to the exhaust side when the cab door is opened while the transmission is in the neutral position or the parking brake is activated. In the illustrated embodiment, the valve opening / closing means 22 comprises a fluid cylinder 24 connected to the arm 20a of the fluid intake / exhaust valve 20, and an electromagnetic valve 28 provided between the fluid cylinder 24 and its fluid source 26. There is. The electromagnetic valve 28 is a battery DC power supply via a neutral switch 30 which is closed in the neutral position of the transmission or a parking switch 35 which is provided in parallel with the neutral switch 30 and which is closed in the parking operation position and a door switch 32 which is closed when the cab door is opened. Connected to 34. The electromagnetic valve 28 extends the fluid cylinder 24 so that the arm 20a of the fluid intake / exhaust valve 20 is displaced upward by supplying a fluid from the fluid source 26 to the fluid cylinder 24 when it is excited, and by a spring (not shown) when it is not excited. The fluid cylinder 24 contracts to displace the arm 20a of the fluid intake / exhaust valve 20 downward.

Next, referring to the operation of the cab suspension device 10 of the present invention, the door is closed while the driver is in the driver's seat of the cab 14 and is driving the vehicle.
Is open, and therefore the fluid cylinder 24 is contracted to displace the arm 20a downward, the fluid having a predetermined fluid pressure is supplied to the fluid suspension 16, and the fluid cylinder 24 stops at the set height of the cab 14. The fluid intake / exhaust valve 20 is locked. The height of the cab 14 is set by control means (not shown). When the driver tries to get off the cab 14, the driver puts the transmission in the neutral position or activates the parking brake and opens the door regardless of whether the engine is running or stopped. The switch 35 and the door switch 32 are both closed, so that the electromagnetic valve 28 is excited, the fluid cylinder 24 extends and the arm 20a is displaced upward, and the fluid intake / discharge valve 20
Is switched to the exhaust side, so the cab 14 descends and the cab 14
It is convenient for the driver to get off and get on from the driver's seat. When the driver gets down and closes the door, or when the driver gets on and closes the door, the electromagnetic valve 28 is controlled by this control means until the height returns to the height set by the control means (not shown).

[Effect of device]

According to the present invention, as described above, the driver of a vehicle with a cab can lower the cab toward the chassis frame when getting into or out of the driver's seat of the cab, which is convenient for getting on and off the driver. There is some real benefit.

[Brief description of drawings]

The drawing is a system diagram of a cab suspension device according to the present invention. 10 …… Cab suspension device, 12 …… Chassis frame, 14 …… Cab, 16 …… Fluid suspension, 18 ……
Fluid supply source, 20 ... Fluid intake / exhaust valve, 22 ... Valve opening / closing means, 24 ... Fluid cylinder, 26 ... Fluid source, 28 ... Electromagnetic valve, 30 ... Neutral switch, 32 ... Door switch, 34 ... … Batteri DC power supply, 35 …… Parking switch.

Claims (1)

[Scope of utility model registration request] 1. A cab suspension device for a vehicle with a cab, which comprises a fluid suspension arranged between a chassis frame and a cab of the vehicle, and a fluid intake / exhaust valve connected to the fluid suspension and a valve for opening / closing the fluid intake / exhaust valve. An opening command for opening the fluid intake / exhaust valve to the exhaust side when the cab door is opened while the transmission is in the neutral position or the parking brake is operating. A cab suspension device for a vehicle with a cab, which generates: