JPH02376Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to a cab support device for a chassis frame such as a truck.

[Prior Art] Conventionally, in order to prevent abnormal vibration of the cab (cab shake), the bottom wall of the cab is supported against the chassis frame via a cab mount made of rubber or synthetic resin. Not getting any effect.

In particular, in order to suppress abnormal cab vibration, methods such as changing the material of the cab mount or increasing the spring constant have been adopted, but on the other hand, the noise performance deteriorates significantly, and it is difficult to prevent both vibration and noise. It is extremely difficult to select conditions that satisfy performance.

As a result of various tests regarding abnormal vibrations of the cab, the inventor of the present invention found that tilting of the cab mount in the left-right direction has a large effect on the abnormal vibrations of the cab.

Regarding this prevention of rolling motion, the conventional technique was
As disclosed in Publication No. 16177, one end of a spring steel plate extending in the vehicle width direction is fixed to the frame,
It is known that the other end is held between the bottom wall of the cab and the mount rubber, but this requires a means to prevent slippage on the overlapping surfaces, and is not an easy means.

Furthermore, in Japanese Utility Model Application Publication No. 56-75056, annular upper mount rubber and lower mount rubber are arranged above and below the horizontal wall of the vehicle body claim, and the cabin mounting part placed on the upper mount rubber is attached to the upper and lower parts. In a cab mount device that is attached to a vehicle body frame by a mounting bolt that passes through a lower mount rubber, a thin circular dish-shaped member fixed to the vehicle body frame is provided between the upper mount rubber and a mounting portion of the vehicle body frame, A cab mount device is disclosed in which the upper mount rubber is accommodated in the dish-shaped member, and a pair of opposing notches are formed in the rising portion of the dish-shaped member in the longitudinal direction of the vehicle.

[Problems to be solved by the invention] However, in the cab mount device disclosed in the above-mentioned Japanese Utility Model Publication No. 56-75056, since the dish-shaped member is thin, it not only has low strength and lacks stability; Since the notch is formed in the upright portion in the longitudinal direction of the vehicle, it cannot cope with large tilting of the cab in the forward direction, especially in the event of a sudden braking collision.

Therefore, the purpose of this invention is to have a simple configuration,
Without changing the material or spring constant of the cab mount, the cab mount is soft in the vertical and longitudinal directions, and stiff against vibrations in the left and right directions, suppressing the tilting of the cab mount in the left and right directions, thereby preventing abnormal vibrations. To provide a cab support device which prevents the cab from collapsing and is safe even in the unlikely event that the cab falls down in the front-back direction.

[Means for Solving the Problem] In order to achieve the above object, the configuration of the present invention is to arrange cab mounts made of cylindrical elastic material above and below the horizontal wall of the chassis frame, and to place the cab on the upper cab mount. The thick oval metal tipping prevention tube is supported on the chassis frame by bolts inserted from the cab bottom wall into both cab mounts, and the gap between the inner surface of the tube and the cab mount is large in the longitudinal direction of the vehicle, and in the lateral direction. It is fixed to the frame or the bottom wall so as to be small in size.

[Function] Cab mounts 14a, 1 in the left and right direction of the vehicle
4b falls, the inner surface of the thick oval metal fall-prevention tube 5 provided with a small gap prevents it from falling in the left-right direction, suppressing lateral vibrations, and suppressing the front and rear of the vehicle. Although normal toppling in the direction is permitted, the inner surface of the toppling prevention tube 5 responds to abnormal toppling due to sudden braking, etc., and prevents abnormal toppling to ensure safety.

[Embodiment of the invention] Usually, at least the four corner portions of the bottom wall 4 of the cab are attached to the horizontal wall portion 6 of the chassis frame by cab mounts 14a and 14b made of rubber or synthetic resin, as shown in FIG. Supported.

The cab mounts 14a, 14b have a hole in the center into which the sleeve 10 is fitted, and plain washers 2, 9 are joined to both upper and lower end surfaces. Cylindrical body 1 connected to the peripheral part
The cylinder body 12 is inserted into a hole 16 in the chassis frame wall 6, and the mounting plate 13 is placed on the wall 6 and provided at the upper end of the cab mount 14b. The cylindrical body 12 is fitted into the cylindrical hole. Then, bolts 3 are inserted through the plain washer 2, sleeve 10, and plain washer 9 from the cab bottom wall 4, and nuts 8 are tightened to support the cab on the horizontal wall b of the chassis frame.

In the present invention, a thick-walled fall-prevention cylinder 5 having an oval cross section is connected to the mounting plate 13 by welding or the like. As shown in FIG. 2, the fall prevention cylinder 5 has an inner surface that approaches the cab mount 14a with a gap t in the left-right direction of the vehicle, and is separated by a gap T in the front-rear direction.

With the above configuration, when the vehicle rides on a protrusion on the road surface, the impact received by the cab is absorbed by the compressive deformation of the cab mount 14a, and the cab mount 14b acts as a plain washer against rebound of the cab. 9 and the wall portion 6 of the frame, thereby suppressing the cab from lifting up.

In this way, the vibrations applied to the chassis frame are absorbed, but if the impact load applied to the chassis frame is large, the amount of compressive deformation of the cab mounts 14a, 14b will be correspondingly large, and simple compression alone will not be sufficient. No, cab mount 1
The axes of 4a and 14b are inclined, and the bolt 3 tends to be inclined with respect to the chassis frame. At this time,
The inner surface of the thick oval metal tipping prevention cylinder 5 provided with a small gap suppresses the tipping in the left and right directions, suppresses lateral vibrations, and prevents the vehicle from falling in the normal longitudinal direction. However, the inner surface of the fall-prevention tube 5 can prevent abnormal fall and ensure safety against excessive fall due to sudden braking.

In the above-described embodiment, the side-fall prevention tube 5 is disposed on the cab mount 14a, but as shown in FIG. If the cab mounts 14a and 14b are covered by a pair of upper and lower horizontal fall prevention cylinders 5, 5A by fixing them,
This further prevents the cab mount from falling sideways.

In the embodiment shown in FIG. 4, the sideways fall prevention tubes are placed at both ends of the cab mounts 14a, 14b instead of being placed in the center. In this embodiment, a horizontal fall prevention tube 5 is provided on the bottom surface of the plain washer 2.
B is obtained by welding a horizontal fall prevention cylinder 5C to the upper surface of a plain washer 9.

The other configurations are the same as those shown in FIG. 1, and similar effects can be obtained.

[Effects of the invention] As described above, the present invention places cylindrical cab mounts made of elastic material above and below the horizontal wall of the chassis frame, places the cab on the upper cab mount, and inserts the cab from the bottom wall of the cab into both of the cab mounts. Supported on the chassis frame with bolts, a thick oval metal tipping prevention cylinder is attached to the frame or the bottom wall so that the gap between the inner surface of the cylinder and the cab mount is large in the longitudinal direction of the vehicle and small in the lateral direction of the vehicle. Since it is fixed, it is possible to prevent the cab from falling to the left or right of the vehicle (cabin shake), and it can also prevent the cab from tipping forward when braking suddenly, ensuring safety. Further, since the fall prevention cylinder is thick and has no notch, it has high strength, and is safe even if the cab mount makes strong contact with it due to the fall in the left-right or front-back directions.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a cab support device according to a first embodiment of the present invention, FIG. 2 is a horizontal sectional view thereof, and FIG. 3 is a side view of a cab support device according to a second embodiment of the present invention. 4 is a side sectional view of a cab support device according to a third embodiment of the present invention. 2...Plain washer, 3...Bolt, 4...
...Bottom wall, 5, 5A, 5B, 5C ... Sideways fall prevention tube, 6 ... Wall of frame, 8 ... Nut, 9 ...
...Plain washers, 10...Sleeves, 12...
...Cylindrical body, 13...Mounting plate, 14a, 14b...
cab mount.

Claims (1)

[Scope of utility model registration request] Cylindrical cab mounts made of an elastic material are arranged above and below the horizontal wall of the chassis frame, and the cab is placed on the upper cab mount and supported on the chassis frame by bolts inserted from the bottom wall of the cab into both cab mounts. A cab support device comprising an oval metal tipping prevention tube fixed to the frame or the bottom wall so that the gap between the inner surface of the tube and the cab mount is large in the longitudinal direction of the vehicle and small in the lateral direction of the vehicle.