JPH02197474A - Mounting device for cab - Google Patents

Abstract

PURPOSE:To further improve riding comfort by interposing between a car body frame and a cab a hydraulic stabilizer suppressing pitching or rolling of the cab, in the case of a truck mounting the cab on the body frame through a cab suspension device. CONSTITUTION:A link lever 19 is turnably supported to a hinge pin 18 provided through a pair or right and left hinge brackets 17 in a frame 10 constituting a body of a truck, and a suspension spring 22 in a front side is interposed between and said lever 9 and a cab 11. While a rear arch 13, serving as a supporting mechanism in a rear end side of the cab 11, provides successively in line in the both sides a protrusive part 15 supporting here a rear side suspension spring 14 supporting a floating bar 12 supporting a rear end part of the cab 11. A hydraulic stabilizer, comprising a pair of front and rear hydraulic cylinders 25, 26, is further provided between the frame 10 and the cab 11, and both the hydraulic cylinders 25, 26 communicate with each other by pipe lines 29, 30.

Description

[Detailed description of the invention]

[Key Point 1 of the Invention] In a vehicle in which a cab is mounted on a body frame via a suspension device, a hydraulic stabilizer is interposed between the body frame and the cab, and the hydraulic stabilizer stabilizes the pitching direction of the cab. This is designed to suppress movement or movement in the rolling direction, thereby preventing bottoming due to deformation of the cab suspension spring and preventing deterioration of riding comfort. K. Prior Art] In general, a truck has a cab mounted on the tip of its body frame. Since hard springs that can withstand high loads are used as suspension springs to suspend the axle, if the cab is mounted directly on the frame, vibrations will be transmitted to the cab through the suspension springs and the frame, resulting in poor ride comfort. Deteriorate. Therefore, the cab is mounted on the frame via a suspension spring, which absorbs vibrations and improves riding comfort. Problem 1 to be Solved by the Invention However, the cab suspension device has a high center of gravity even though the distance between the front and rear suspension springs is short, and the stroke of the suspension spring is also smaller than that of a passenger car. Therefore, pitching tends to occur when the vehicle suddenly starts or brakes, and rolling occurs when the vehicle turns. Such pitching and rolling can affect the stroke of the suspension spring, causing bottoming, which worsens the ride comfort of the cab. In order to improve the deterioration in riding comfort caused by such pitching and rolling, it is considered to increase the spring constant and damping force of the cab suspension spring to reduce the movement of the cab. However, such measures limit the effectiveness of the cab suspension device, leading to deterioration in ride comfort. Improvements through suspension geometry such as anti-nose dive geometry and anti-roll geometry are also being considered, but these would be subject to mounting restrictions. Therefore, it is not possible to design according to theory, and such countermeasures do not lead to fundamental improvements. The present invention has been made in view of these problems, and an object of the present invention is to provide a cab mounting device that further improves the ride comfort of the cab without limiting the effects of the cab suspension device. The purpose is to

[Means to solve the problem]

The present invention provides a device in which a cab is mounted on a vehicle body frame via a cab suspension device, in which a hydraulic stabilizer for suppressing pitching or rolling of the cab is interposed between the vehicle body frame and the cab. This is how it was done. [K effect] Therefore, the pitching or rolling of the cab supported on the frame via the suspension device is suppressed by the hydraulic stabilizer, and the cab is largely displaced over the entire stroke of the cab suspension device, causing bottoming. disappears. K Embodiment FIG. 2 shows a cab mounting device according to a first embodiment of the present invention, in which a cab 11 is mounted on the front end side of a truck frame 10 via a suspension device. It looks like this. A floating lever 12 is attached to the rear end side of the cab 11, and this 70-ting lever 12 is supported by a rear arch 13 on the frame 10 side via a suspension spring 14. The suspension springs 14 are placed on protrusions 15 on both sides of the rear arch 13. On the other hand, the support mechanism on the front end side of the cab 11 includes a hinge bracket 17. The hinge brackets 17 are attached to the front ends of the frame 10 on both sides (as well as attached to
This hinge bracket 17 rotatably supports a link lever 19 via a hinge bin 18 that communicates with the left and right sides. A tilt bracket 20 is rotatably attached to the tip of the link lever 19 via a pin 21. Further, a suspension spring 22 is provided on the link lever 19, and the front end of the cab 11 is supported by this spring 22. In this way, the front and rear suspension springs 2 are attached to the frame 10.
As shown in FIGS. 1 and 2, a hydraulic stabilizer is interposed between the cab 11 and the frame 10, which are supported via 2.14. The hydraulic stabilizer consists of a pair of hydraulic cylinders 25,26. The front hydraulic cylinder 25 is connected to the front end of the frame 10, and its piston rod 27 is connected to the cab 11.
is connected to the front end of the Also, the rear hydraulic cylinder 2
6 is connected to the frame 10 at a position corresponding to the rear part of the cab 11, and its piston rod 28 is connected to the cab 11. Furthermore, the pair of hydraulic cylinders 25,26 are communicated with each other by a conduit 29,30. These conduits 29.
30 are mutually arranged in an X-shape, and the chambers on opposite sides communicate with the pistons of the front and rear hydraulic cylinders 25, 26. Further, accumulators 31 and 32 are attached to each of the conduits 29 and 30. Therefore, if the front end of the cab 11 supported by the cab suspension device consisting of the front and rear suspension springs 22.14 pitches downward, the piston of the front hydraulic cylinder 25 moves downward, causing the lower The oil in the chamber is supplied to the upper chamber of the rear hydraulic cylinder 26 through the conduit 30. As a result, the piston of the rear hydraulic cylinder 26 is pushed downward, and the rear part of the cab 11 is pulled downward. Furthermore, when a force is applied that causes the front end of the cab 11 to move upward, a force that suppresses this movement is generated by the hydraulic cylinders 25 and 26. In this way, pitching of the cab 11 is prevented by the hydraulic stabilizer consisting of the front and rear hydraulic cylinders 25, 26. As described above, according to the truck cab 11 bodywork device according to the present embodiment, the movement of the cab 11 in the pitching direction is controlled by the hydraulic stabilizer consisting of the oil cylinder 25.26 and the conduit 29.30 provided with the accumulator 31.32. will be suppressed. In addition, compared to a mechanical stabilizer using torsion bars, the degree of freedom in installation is increased, and the characteristics can be changed depending on the amount of air filled in the accumulators 31 and 32, which allows for freedom in characteristics. It is possible to increase the degree. By suppressing the movement of the cab 11 in the pitching direction by such a hydraulic stabilizer, the spring 22 that constitutes the suspension device of the cab 11 is
．． 14 can be prevented from being significantly deformed, and bottoming of the cab 11 relative to the frame 10 can be prevented. Therefore, it becomes possible to improve the deterioration in riding comfort caused by bottoming. Since the cab suspension device is suspended on the chassis frame 10, the movement of the cab 11 roughly becomes a plane vibration relative to the frame 10. And the random input from the four-point spring 22.14 is
Less compared to chassis suspension. Furthermore, regarding the pitching direction component, due to the truck's long wheelbase and large vehicle weight, the input from the unsprung area is small and the vibration period is long. For this reason, even if the suspension has a high spring constant only in the pitching direction, the ride comfort will not deteriorate that much, and in fact it will lead to an improvement in ride comfort in that a smaller stroke can be secured for the simple vertical component. Become. Next, a second embodiment of the present invention will be described with reference to FIG. In the mechanism shown in FIG. 3, a hydraulic stabilizer is used to suppress rolling, and hydraulic cylinders 25 and 26 constituting the hydraulic stabilizer are mounted on the left and right sides. That is, hydraulic cylinders 25 and 26 are respectively attached to the left and right frames 10, and these piston rods are connected to the left and right bottoms of the cab 11, respectively. The hydraulic cylinders 25,26 are also connected by lines 29,30 each having an accumulator 31,32. Therefore, according to the vehicle according to this embodiment, when the cab 11 attempts to roll to the left or right during a turn, the hydraulic stabilizer generates a force that resists this rolling, thereby causing the cab 11 to roll. This will suppress rolling. Therefore, the cab 11 is prevented from wobbling left and right with respect to the frame 10 during turning, and bottoming due to deformation of the suspension springs 22, 14 due to rolling is prevented, and deterioration of riding comfort can be prevented. Also, this example is described in the first example above.
By combining the above embodiments with the above embodiments, a cab suspension device that exhibits the respective effects can be obtained. Effects of the Invention 1 As described above, in the present invention, a hydraulic stabilizer for suppressing pitching or rolling of the cab is interposed between the vehicle body frame and the cab. Therefore, this hydraulic stabilizer makes it possible to suppress pitching or rolling of the cab, and prevent bottoming caused by large deformation of the cab suspension spring during pitching or rolling. Fig. 1 is a piping diagram showing the structure of a hydraulic stabilizer of a cab mounting system according to a first embodiment of the present invention, Fig. 2 is a perspective view of the same as a whole, and Fig. 3 is a diagram showing the structure of a hydraulic stabilizer of a cab mounting system according to a first embodiment of the present invention. FIG. 2 is a perspective view of the device. The names of the main parts in the drawings are as follows. 10... 11... 12... 13... 14... 17... 19... 22... 25. 26... 27.28φ・ 29.30... 31.32... ・Vehicle frame, cab, 70-ting bar, rear arch, suspension spring (rear) ・Hinge bracket, link lever, suspension spring (front) ・Hydraulic cylinder・Piston rond・Pipeline φ7 cumulator

[Brief explanation of the drawing]

Claims (1)

[Scope of Claims] 1. In a device in which a cab is mounted on a vehicle body frame via a cab suspension device, a hydraulic stabilizer for suppressing pitching of the cab is interposed between the vehicle body frame and the cab. A cab mounting device characterized in that the cab is mounted on a vehicle. 2. In a device in which a cab is mounted on a vehicle body frame via a cab suspension device, a hydraulic stabilizer for suppressing rolling of the cab is interposed between the vehicle body frame and the cab. A cab bodywork device featuring: