JPH03286044A - Vibration restrainer of vehicle - Google Patents

Abstract

PURPOSE:To restrain ocsillation of a vehicle body effectively by providing a balance weight on either side of the front or rear of a vehicle body so that it may vibrate through a holding spring, and vibrating a driver's seat device and the balance weight with the same phase. CONSTITUTION:A balance weight 23 is provided on either side of the front or rear of a vehicle body so that it may move vibrate through a holding spring 24. Between the vehicle body 1 and the balance weight 23, there is also provided a working cylinder 26 which is operated by the vibration of the balance weight 23. Moreover, a driver's seat device 9 is provided on the vehicle body 1 through the holding cylinder 15, and the working cylinder 26 and the holding cylinder 15 are connected so that the balance weight 23 and the driver's seat device 9 may vibrate with the same phase. The pitching and bouncing which are apt to occur during vehicle running are restrained by the vibration of the balance weight 23 which vibrates with an opposite phase to the vehicle body 1. Besides, interlocking of the driver's seat device 9 with the balance weight 23 attenuates the vibration of the balance weight 23 in an early stage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibration suppression device for a vehicle such as a wheel loader.

(Prior Art) As a vibration suppressing device for a wheel loader, there is a device as shown in, for example, Japanese Patent Application Laid-Open No. 63-265023.

In this device, the load holding side oil chamber of the boom cylinder in the work equipment is connected to an accumulator, and the work equipment as a mass member and the accumulator that has a spring action form a dynamic damper. Pitching, bouncing, etc. of the vehicle body are suppressed. By the way, with the above, during excavation work, it is necessary to shut off the oil passage between the boom cylinder and the accumulator to protect the accumulator from high-pressure hydraulic oil, so an on-off valve is provided between the boom cylinder and the accumulator. There was a need.

In addition, in the above system, when the vibration suppression device is activated, the load side oil chamber needs to be in communication with the tank in order to allow expansion and contraction of the boom cylinder. It was necessary to interpose a connecting means between the tanks in order to connect the two tanks so that they can be switched between a communication state and a disconnection state.

(Problems to be Solved by the Invention) As mentioned above, in the conventional vibration suppressing device, in addition to the accumulator that constitutes the dynamic damper, it is necessary to also provide an on-off valve and a connecting means, and the hydraulic circuit of the working device is complicated. There was a problem that the cost was high.

Further, when changing from the traveling position to the working position or vice versa, it is necessary to operate the on-off valve and the connecting means, which is very troublesome.

Furthermore, if you forget to perform the above operation when transitioning from a working position to a running position, the vibration suppression device will simply not operate; however, if you forget to perform the above operation when transitioning from a running position to a working position, There is a problem with the accumulator being damaged.

Therefore, it is necessary to have a safety device in case the user forgets to perform the above operation, or a device that automatically performs the above operation.
Furthermore, there is a problem in that the vibration suppressing device is complicated and costs are increased.

In addition, since an accumulator provided in the hydraulic circuit of the work equipment is used, there is a problem in that the vibration suppression device cannot be activated when the work equipment is operated by the hydraulic circuit during work. .

An object of the present invention is to provide a vibration suppression device for a vehicle that can solve the above problems.

(Means for Solving the Problems) In order to solve the above problems, the means adopted by the present invention are as follows:
A balance weight is provided in the front and rear of the vehicle body so that it can vibrate via a retaining spring, and an operating cylinder that is actuated by the vibration of the balance weight is interposed between the vehicle body and the balance weight. The device is provided so as to be able to vibrate via the holding cylinder, and the operating cylinder and the holding cylinder are connected in such a way that the balance weight and the driver's seat device vibrate in the same phase.

(Function) When the vehicle is running or working, the vehicle body tends to pitch or bounce depending on the undulations of the road surface or when accelerating or decelerating.

At this time, the balance weight vibrates in a phase opposite to that of the vehicle body against the holding spring and the actuating cylinder, so pitching, bouncing, etc. of the vehicle body are suppressed.

Additionally, since the operating cylinder is connected to the holding cylinder and the driver's seat device vibrates in the same phase as the balance weight, the driver's seat device vibrates in the opposite phase to the pitching and bouncing of the vehicle body. Due to this interlocking, vibrations of the balance weight can also be damped quickly.

(Example) Hereinafter, an example in which the present invention is applied to a wheel loader will be described based on the drawings. The drawing shows a wheel loader,
The wheel loader includes a vehicle body 1 and a working device 2 provided at the front of the vehicle body 1.

The vehicle body 1 is a vehicle body 6 that stands out from the front and rear frames 4.5, etc.
It has left and right front and rear wheels 7.8, a driver's seat device 9, etc.

The driver's seat device 9 has a cabin 11, a control device 12 disposed in the cabin 11, a driver's seat 13, etc., and both sides of the lower end of the front end of the cabin 11 are connected to the rear frame 5. It is pivotally supported on both sides of the upper end of the front end by pivot shafts 14 in the left-right direction so as to be vertically swingable.

Reference numeral 15 denotes a pair of left and right holding cylinders, which are double-acting hydraulic cylinders and are attached to each left and right side of the rear frame 5 and the cabin 11.
It is interposed between both sides of the lower end of the rear end and holds the driver's seat device 9 so as to be able to swing up and down.

The working device 2 includes a pair of left and right booms 18 that are pivotably supported on the front frame 4 so as to be able to move up and down, a pair of left and right boom cylinders 18 that are interposed between the front frame 4 and each boom 17, and a cylinder that rotates at the front end of the boom 17. a packet 19 which is pivotably supported;
It has a packet cylinder 20 and the like interposed between the front frame 4 and the packet 19.

A dynamic damper 22 includes a balance weight 23 for balancing the load, a pair of right and left holding springs 24 for holding the balance weight 23 so as to be able to swing up and down, and the like.

The balance weight 23 has a horizontally long and vertically long shape, and is arranged at the rear of the rear frame 5, so that the left and right sides of the lower part of the front end of the balance weight 23 are attached to the right and left sides of the lower part of the rear end of the rear frame 5 in the left and right direction. It is pivotally supported by a pivot shaft 25 . Note that the weight of the balance weight 23 is considerably larger than that of the driver's seat device 9.

A tension coil spring is used as the holding spring 24,
It is elastically interposed between the upper left and right sides of both the rear frame 5 and the balance weight 23.

Reference numeral 26 denotes a pair of left and right operating cylinders, which are double-acting hydraulic cylinders and are interposed between the left and right sides of the vertical midway of both the rear frame 5 and the balance weight 23, and are used to control the swing of the balance weight 23. Expands and contracts with movement.

The left and right operating cylinders 26 and the holding cylinders 15 are connected by oil passages so that the balance weight 23 and the driver's seat device 9 swing in the same phase.

According to the embodiment configured as described above, when the wheel loader is traveling or working, the vehicle body 1 and the working device 2 of the wheel loader tend to pitch or bounce depending on the undulations of the road surface or when accelerating or decelerating. shall be.

At this time, the balance weight 23 of the dynamic damper 22 swings up and down against the holding spring 24 and the operating cylinder 26, and the balance weight 23 moves in the opposite direction to the direction in which the rear part of the vehicle body 1 attempts to move. Therefore, pitching, bouncing, etc. of the vehicle body 1 and the working device 2 are suppressed.

Also, along with this, the operating cylinder 26 is connected to the holding cylinder 15.
Since the driver's seat device 9 is connected to the vehicle body 1 and swings in the same phase as the balance weight 23, the driver's seat device 9 is connected to the vehicle body 1.
The balance weight 23 swings in a phase opposite to the pitching and bouncing of the balance weight 23, and due to this swing, the swing of the balance weight 23 is also quickly attenuated.

As described above, pitching, bouncing, etc. of the vehicle body 1 and the working device 2 are suppressed, and the driver's seat bag W
9 swings in a phase opposite to the pitching and bouncing of the vehicle body 1, so that almost no vibration is transmitted to the operator on the driver's seat 13.

In the embodiment, the driver's seat device is pivotally supported, but it may be held movably up and down only by a holding cylinder.

Further, in the embodiment, the driver's seat device has a cabin, but it may not have a cabin.

Further, in the embodiment, the balance weight is provided at the rear end of the vehicle body, but the balance weight may be provided at the front end of the vehicle body.

In addition, in the embodiment, each cylinder was a hydraulic cylinder, but
Other fluid pressure cylinders may also be used.

Furthermore, the present invention is applicable to vehicles other than wheel loaders.

(Effects of the Invention) As detailed above, according to the present invention, pitching, bouncing, etc. of the vehicle body are suppressed by the operation of the dynamic damper, and the driver's seat device is configured to act in a manner that is opposite to the pitching and bouncing of the vehicle body. Since the vibrations occur in the phase of It is convenient, and moreover, in the case of a vehicle equipped with a working device, the dynamic damper can be operated even when the working device is operated by the hydraulic circuit.

Further, the vibration of the balance weight is also quickly damped due to the vibration of the driver's seat device.

[Brief explanation of drawings]

The drawing is a side view of a wheel loader showing one embodiment of the present invention. 1...Vehicle body, 2...Working device, 9
... Driver's seat device, 15 ... Holding cylinder, 22 ... Dynagon damper, 23 ...
... Balance weight, 24 ... Holding spring, 26 ... Operating cylinder.

Claims (1)

[Claims] (1) A balance weight is provided on one side of the front and rear of the vehicle body so that it can vibrate via a holding spring, and an actuating cylinder that is actuated by the vibration of the balance weight is interposed between the vehicle body and the balance weight. A vibration suppression device for a vehicle, characterized in that the driver's seat device is provided so as to be able to vibrate via a holding cylinder, and the operating cylinder and the holding cylinder are connected so that the balance weight and the driver's seat device vibrate in the same phase. .