JPS5963277A - Cab suspension device - Google Patents

Abstract

PURPOSE:To keep the natural frequency of a cab nearly constant regardless of the change of cab weight by a structure wherein an auxiliary elastic member to increase the spring constant at the state, in which the deflection of a spring plate becomes large due to the increase of the cab weight, is provided. CONSTITUTION:A rubber 10 serving as an auxiliary elastic member is mounted on the underside of a spring plate 5 at its middle. The rubber 10 is apart from the upper surface wall 3a of a rear arch 3, when the weight of a cab 1 is small, while the rubber 10 is brought into contact with the upper surface wall 3a, when the deflection of the spring plate 5 becomes larger with the increase of cab weight. Shock absorbers 13 and 13 are arranged between brackets 11 and 11 provided in the rear arch 3 and the brackets 12 and 12 provided on a floating bar 1a in order to enable to damp the vibration of the cab 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cab suspension device that supports the cab of an automobile such as a truck.

Conventionally, as a support for the cab (operation) lft of a cab-over type automobile as shown in Fig. 1, there is a combination of a coil spring and a cab absorber, for example. ) has no rigidity, so it must be combined with a link to prevent lateral vibration, which complicates the structure and increases the weight. There is also a model in which a leaf spring a is arranged in the vehicle width direction of the chassis 2 to support the 70-ring par 1a on the cab side, but in this case, it has linear spring characteristics like the above-mentioned one using a coil spring. As a result, there were drawbacks as described below.

That is, the natural frequency W of the cab is expressed as wocK/M, where the cab mass M1 is the spring constant K, and as the cab mass M increases, W decreases. In general, the natural frequency W of the cab is set to be larger than the frequency transmitted from the vehicle body in order to prevent co-photography with the vibration system of the vehicle body. Therefore, if the spring constant K is one foot, if the actual weight M of the spring 7'' increases due to snow accumulation, an increase in the number of passengers, the installation of heavy objects, etc., W will decrease, and it will resonate with the camera body, resulting in a poor ride quality. This causes problems such as the car body becoming unstable.

The present invention has been made based on the above circumstances, and an object thereof is to provide a cab suspension device that can keep the natural frequency of the cab substantially constant regardless of changes in the weight of the cab.

That is, in the present invention, in a device in which a spring plate is disposed in the vehicle width direction between a cab and a chassis, the weight of one cab is increased on the spring plate or a member opposite to the spring plate, and the spring plate is deflected. The invention is characterized in that an auxiliary elastic member, such as a lance or an auxiliary spring plate, is provided to increase the spring constant by contacting the spring plate or the other member facing the spring plate when the spring plate is turned into a dog. This is a cab suspension device.

Refer to FIG. 3 below for a first embodiment of the present invention.

This floating parlor 1a is provided below the cab 1 and supports the gear 1. 2 is a chassis, and a rear arch 3 is attached to this chassis 2. The rear part of the cab 1 is supported by this rear arch 3 via a cab suspension device 4 and a floating par 1a.

The cab suspension device 4 includes a spring plate 5 arranged in the vehicle width direction. The spring plate 5 is made of steel or F'RP to reduce weight, and has a curved shape that is higher at the center. Then, attach the eyelets 5a, 5a formed at both ends of the spring plate 5 to the rear arch 3.
It is pivoted to a bracket 6.6 fixed to the.

Further, the central portion of the spring plate 5 is connected to a floating part 1a by a center (not shown) via a support 7 by a bolt.
It is installed on. A rubber 10 as an example of an auxiliary elastic member is attached to the lower surface of the center of the spring plate 5. Further, the lower surface of the rubber 10 is connected to the upper surface wall 3a of the rear arch 3.
It is designed to face. The rubber 10 is separated from the upper wall 3a of the rear arch when the weight of the cab 1 is small, that is, when the spring plate 5 is largely warped, and when the weight of the cab increases and the deflection of the spring plate 5 becomes large. It comes into contact with the rear arch top wall 3a.

In addition, the bracket 11°11 provided on the rear arch 3,
! :, Bracket 12 installed on floating par 18
, 12, respectively, a shock absorber 13.1
3 is provided so that the photographing of the cab 1 can be attenuated.

Since the present embodiment is constructed as described above, when the load applied to the cab 1 is small, the rubber 10 is separated from the rear arch top wall 3a and only the spring constant of the spring plate 5 acts, so that the cab suspension device 4 is The spring constant of is small.

When the weight of the cab increases, the deflection of the spring plate 505 increases, and the rubber 10 comes into contact with the rear arch top wall 3a, and the spring constant of the rubber 10 is calculated with a grain of salt, so the spring constant of the cab suspension device 4 increases. .

That is, when the force of the cab mass #M is increased n, the spring constant also increases accordingly, and K/M can be made constant, thereby preventing the natural frequency W from fluctuating significantly. Therefore, even if the cab mass M increases due to snow accumulation, increased number of passengers, loading of heavy objects, etc., the natural frequency W can be prevented from decreasing, and harmful resonance with the vehicle body vibration system can be prevented.
Riding comfort can be improved.

Furthermore, the spring plate 5 has rigidity in the horizontal direction and does not cause the body surface to tilt or collapse as seen in the case of coil springs, so it can also be used as a structural member against rolling of the vehicle body. It is possible. Therefore, a link for preventing lateral vibration, which is required when using a coil spring, can be omitted, contributing to the simplification of the structure.

In addition, the rubber 10 is used not only to obtain non-linear characteristics, but also to prevent the spring plate 5 from directly contacting the rear arch 3, thereby reducing the wear and noise caused by the spring plate 5 hitting the rear arch 3. It is also effective in preventing the occurrence of abnormal noise.

Note that FIG. 4 shows a second embodiment of the present invention.
In this case, auxiliary spring plates 9 and rubbers io, io are used as examples of auxiliary elastic members for obtaining nonlinear spring characteristics. As the weight of the cab increases, the main spring plate 5 and the auxiliary spring plate 9 come into contact via the rubber 10.10, and the spring constant of the auxiliary spring plate 9 is added, so at this point of contact. Therefore, the spring constant becomes large, and nonlinear spring characteristics can be obtained as in the first embodiment. The rest of the structure is the same as that of the first embodiment, so common parts are given the same reference numerals and explanations will be omitted.

In addition, as shown in FIG. 5 as a wc3 embodiment, an auxiliary spring plate 9 is attached to the lower surface side of the main spring plate 5, and a rubber 10.10 is attached to this auxiliary spring plate 9. The auxiliary spring plate 9 may be brought into contact with the rear arch upper wall 3a via the rear arch upper wall 3a to obtain non-linear spring characteristics.

Further, FIG. 6 shows a fourth embodiment of the present invention.
In this case, when the weight of the cab increases, the main spring plate 5 and the auxiliary spring plate 9 are sequentially brought into contact with each other from the side of the vehicle center side tab support 7, so that the contact area increases continuously. Therefore, the force increasing ratio of the spring constant can be made smoother and more continuous than in the first to third embodiments.

In each of these embodiments, both ends of the spring plate 5 are attached to the rear arch 3 as an example of a member on the chassis side, and the spring plate 5 is attached to the rear arch 3 as an example of a member on the chassis side.
The center part of the spring plate 5 is attached to the cab side, but on the contrary, both ends (eyes) of the spring plate 5 are attached to the cab side, and the center part of the spring plate 5 is supported by a member on the chassis side. You may.

It is also possible to use a compression coil spring instead of rubber as the auxiliary elastic member.

As described above, the present invention combines a spring plate and an auxiliary elastic member to obtain a nonlinear spring characteristic in which the spring constant increases as the weight of the cab increases. It is possible to prevent the natural frequency of the cab from decreasing. Therefore, resonance of the cab due to vibration of the vehicle body can be prevented, contributing to improved riding comfort and stabilization of the vehicle body. In addition, since the cab is supported using a spring plate, there is no need to use an extra mechanism like the coil spring type, and the spring plate alone can provide horizontal separation, allowing the cab to be moved horizontally. It has great effects, such as being able to double as a vibration prevention function.

[Brief explanation of the drawing]

Figure 1 is a side view of the cab, Figure 2 is a front view of an example of a conventional suspension device as seen from the direction of the arrow in Figure 1.
3 to 6 are front views of the cab suspension device showing the first to fourth embodiments of the present invention, respectively. 9-1...Cab, 1a...Floating part (cab side member), 2... Chassis, 3... Rear arch (chassis side member), 4... Cab suspension device, 5... Spring plate, 9... Auxiliary spring plate (auxiliary (elastic member), 10... (auxiliary elastic member). Applicant's representative Patent attorney Takehiko Suzue 10-

Claims (1)

[Claims] A spring plate is arranged in the vehicle width direction between the cab and the chassis, and both ends of this spring plate are attached to either the cab or the chassis side member, and the middle part of the spring plate is attached to the other side. In the cab suspension device that supports the spring plate or the other member facing the spring plate, when the weight of the cab increases and the deflection of the spring plate becomes large, the spring plate or the opposite member A cab suspension device characterized by being provided with an auxiliary elastic member that increases a spring constant by coming into contact with an opposing member.