JPH0722323Y2 - Fluid pressure suspension system for connected vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a fluid pressure suspension device for an articulated vehicle.

(Prior Art) In a connected vehicle such as a tractor trailer, a fluid pressure spring is used as a suspension spring of a towed vehicle (Japanese Patent Laid-Open No.
(See Japanese Patent Publication No. 104217) is known.

In FIG. 6, suspension arms 3 are attached to both ends of an axle 2 of a trailer 1, and one end of the arm 3 is connected to a frame 4 so that the axle 2 can freely rotate in the vertical direction.
A fluid pressure spring 5 suspends both ends of the axle 2 and is interposed between the other end of the suspension arm 3 and the frame 4.

A leveling valve 6 that supplies and discharges a fluid pressure (for example, air pressure) in the spring 5 in accordance with a change in vehicle height is disposed in the middle of the piping of each fluid pressure spring 5. The leveling valve 6 comprises a body 10 having a port 7 on the fluid pressure spring 5 side and ports 8 and 9 on the low pressure side and the high pressure side, and a spool 11 that slides in the body 10 in the axial direction. The three ports 7 to 9 are blocked by and the port 7 is communicated with 8 or 9 when moved to the left or right. spool
11 is connected to the suspension arm 3 via an L-shaped lever 12 and a drive rod 13,
Slides in the axial direction with the movement of.

For example, when the vehicle turns, the left and right fluid pressure springs 5 expand on the inner wheel side and are compressed on the outer wheel side, but at this time, the left and right leveling valves 6 respectively operate to supply fluid pressure to the fluid pressure springs 5 on the pressure side. However, since the fluid pressure in the extension side fluid pressure springs 5 is discharged, a couple force (rolling reaction force) in a direction opposite to the inclination of the vehicle body is generated between the left and right fluid pressure springs 5 to prevent rolling of the vehicle body. Suppress.

(Problems to be solved by the invention) However, in this case, although the leveling valve 6 operates immediately in response to the rolling of the vehicle body, it takes time to supply and discharge the fluid pressure until a couple force is generated between the left and right fluid pressure springs 5. Therefore, there is a problem in that the rolling angle of the vehicle body becomes excessively large especially during a transitional turning with a steerable steering wheel, unless the turning vehicle speed is reduced, because a response delay occurs.

Although not a connected vehicle, it is proposed to provide hydraulic pressure generation means that responds to the steering operation of the vehicle and an actuator that drives the leveling valve by this supplied hydraulic pressure in order to quickly suppress the tilt of the vehicle body when turning. However, it is difficult to apply it to a connected vehicle that can separate the towed vehicle and the towed vehicle due to the difficulty in hydraulic piping.

(Means for Solving the Problem) In order to solve such a problem, the present invention provides a fluid pressure spring that independently suspends the left and right axles of a towed vehicle that is connected to the towed vehicle via a coupler. In a fluid pressure suspension device of a connected vehicle including leveling valves for supplying and discharging the fluid pressure in each spring according to a vehicle height, fluid pressure chambers are provided on both sides of a piston that axially slides on a drive rod of each leveling valve. While installing a damper cylinder,
Connection angle detection means that makes a stroke according to the intersection angle around the joint point in the coupler between the towing vehicle and the towed vehicle, and the fluid pressure on both sides inside the left and right damper cylinders is selectively linked to this detection means. Provide a control valve to supply and discharge.

(Operation) For example, when the vehicle is turning, if a bending angle (intersection angle) is generated between the towed vehicle and the towed vehicle, the connecting angle detecting means makes a stroke accordingly, and the left and right damper cylinders are moved through the control valve. Supply and discharge fluid pressure on both sides. As a result, the left and right leveling valves are driven by the damper cylinders respectively, and the fluid pressure is supplied to the fluid pressure spring on the outer ring side.
The fluid pressure in the fluid pressure spring on the inner ring side is discharged. Therefore, a couple force is generated between the left and right fluid pressure springs to push up the turning outer side of the vehicle body and lower the inner side, so that the rolling angle of the towed vehicle turning following the towing vehicle is effectively suppressed. can do.

(Embodiment) FIGS. 1 to 4 show an embodiment applied to a semi-trailer type connecting vehicle, in which an axle 21 of a trailer 20 is suspended at both ends by a fluid pressure spring 23 via suspension arms 22 as before. . A leveling valve 24 (having the same configuration as before) that supplies and discharges a fluid pressure (for example, air pressure) in the spring 23 in accordance with a vehicle height change is disposed in the middle of the piping of each fluid pressure spring 23.

Each drive rod 25 of the left and right leveling valves 24 is provided with a damper cylinder 29 having fluid pressure chambers 27 and 28 on both sides (up and down) of a piston 26 that slides in the axial direction. Damper cylinder 29
When the upper and lower fluid pressure chambers 27 and 28 have the same pressure, a spring 31 housed in the cylinder 30 and a weight at the tip of the L-shaped lever 32.
It is held in the neutral position due to the balance with 33, and the fluid pressure chamber 2
When a fluid pressure is supplied to either one of 7 and 28 from a control valve 40 described later, the piston 26 slides while discharging the fluid pressure in the other fluid pressure chamber 28 or 27, that is, the drive rod 32 expands and contracts. Let The piston 26 is formed with an orifice 34 which connects the upper and lower fluid pressure chambers 27 and 28.

On the other hand, the fifth wheel coupler 51 on the side of the tractor 50 has a saddle 52 that constitutes the mounting surface of the trailer 20 and a balance pin 5 that connects the saddle 52.
A guide groove 58 is formed in the saddle 52 for guiding engagement of the connecting pin 56 of the trailer 20 with the pin hole 57 of the trailer 20. The trailer 20 is provided with an engaging member 61 movably via a roller 60 on a rail 59 attached on an arc centered on the connecting pin 56, and the engaging member 61 of the fifth wheel coupler 51 is connected to the tractor 50 when the engaging member 61 is connected. It engages with the guide groove 58 and moves on the rail 59 as the saddle 52 rotates about the connecting pin 56. An arm 62 is projectingly provided on one side of the engaging element 61, and a tip of the arm 62 is connected to a drive rod 41 of the control valve 40 via a rod 63.

The control valve 40 is provided with a reservoir tank 46 that replenishes the working fluid (oil) to the fluid pressure chambers 44 and 45 on both sides (front and rear) of the piston 43 that slides in the cylinder 42 in the axial direction.
The fluid pressure in the fluid pressure chamber 44 or 45 that shrinks with the sliding is pushed out through the port 44A or 45A, and the fluid pressure is sucked into the fluid pressure chamber 45 or 44 that expands through the port 45A or 44A. The fluid pressure chamber 44 on the side of the drive rod 41 connected to the engaging element 61 is the lower fluid pressure chamber 28 of the damper cylinder 29A on the pressure side.
And the upper fluid pressure chamber 27 of the damper cylinder 29B on the right side, and the fluid pressure chamber 45 on the opposite side is connected to the upper fluid pressure chamber 27 of the damper cylinder 29A on the left side and the lower fluid pressure chamber 28 of the damper cylinder 29B on the right side, respectively. It

With such a configuration, when the tractor 50 is steered to the left as shown in FIG. 5 when the vehicle turns, the engaging element 61 moves to the right on the rail 59 via the saddle 52 of the fifth wheel coupler 51, The drive rod 41 of the control valve 40 is displaced to the left side (drawing direction) in the figure via the rod 63. As a result, the piston 43 in the control valve 40 pushes out the fluid pressure in the fluid pressure chamber 44, so that the lower fluid pressure chamber 28 of the left damper cylinder 29A and the upper fluid pressure chamber 27 of the right damper cylinder 29A.
Supply to the piston 2 in the damper cylinder 29A on the left side.
6 slides upward while discharging the fluid pressure in the upper fluid pressure chamber 27 to the fluid pressure chamber 45 of the control valve 40, and the piston 26 in the damper cylinder 29B on the right side moves to the lower fluid pressure chamber 28.
It also slides downward while discharging the fluid pressure inside.

Therefore, the spool 39 of the right leveling valve 24 slides to the left side in the drawing through the L-shaped lever 32 due to the extension of the drive rod 25, and supplies the fluid pressure into the fluid pressure spring 23 on the outside of the turning. The spool 39 of the left leveling valve 24 also slides to the right side in the drawing due to the contraction of the drive rod 25, and the fluid pressure in the fluid pressure spring 23 on the inside of the rotation is discharged.

Therefore, a couple of forces tending to incline the vehicle body inward is generated between the left and right fluid pressure springs 23, so that the rolling angle of the trailer 20 turning following the tractor 50 can be effectively suppressed.

If the vehicle stops while turning (the body is tilted), the orifice 34 of the piston 26 in the damper cylinder 29
As a result, the upper and lower fluid pressure chambers 27 and 28 have the same pressure, so that each of the leveling valves 24 supplies and discharges the fluid pressure to the left and right fluid pressure springs 23 so as to return the vehicle body to a horizontal state.

(Effects of the Invention) In short, according to the present invention, the fluid pressure springs independently suspended on the left and right axles of the towed vehicle that are connected to the towed vehicle via the coupler, and the fluid pressures inside these springs are respectively applied to the vehicle. In a fluid pressure suspension device for a connected vehicle equipped with a leveling valve for supplying / discharging according to height, a damper cylinder having fluid pressure chambers on both sides of a piston that slides in the axial direction is provided on a drive rod of each leveling valve, Connection angle detecting means for making a stroke according to an intersection angle around a joint point in a coupler with a towed vehicle, and fluid pressure on both sides inside the left and right damper cylinders is selectively supplied and discharged in conjunction with this detecting means. Since the control valve is provided, the rolling angle of the towed vehicle during turning can be effectively suppressed, and if the control valve supply / discharge amount is increased, The effect that the car body can be tilted inward is also obtained.

[Brief description of drawings]

FIG. 1 is a side view of a main portion of a trailer showing an embodiment of the present invention, FIG. 2 is a partially cutaway side view showing a connected state of a tractor and a trailer, FIG. 3 is its plan view, and FIG. 4 is the same. 5 is a piping diagram of the control valve, FIG. 5 is an explanatory view of the operating state of the same, and FIG. 6 is a side view of the main part of the trailer showing the prior art. 20 …… Trailer, 21 …… Axle, 23 …… Fluid pressure spring, 24…
… Leveling valve, 25 …… Drive rod, 29 …… Damper cylinder, 40 …… Control valve, 50 …… Tractor, 51
...... 5th wheel coupler, 61 ...... engager.

Claims (1)

[Scope of utility model registration request] 1. A fluid pressure spring for independently suspending left and right axles of a towed vehicle connected to a towing vehicle via a coupler, and leveling for supplying and discharging fluid pressures in the springs according to vehicle heights. In a fluid pressure suspension device for a coupled vehicle equipped with a valve, a damper cylinder having fluid pressure chambers on both sides of a piston that slides in the axial direction is provided on a drive rod of each leveling valve, while a coupler for a towed vehicle and a towed vehicle is provided. A connecting angle detecting means for making a stroke according to an intersection angle centered on the joint point and a control valve for selectively supplying / discharging fluid pressure on both sides inside the left and right damper cylinders are provided in association with the detecting means. And a fluid pressure suspension device for a connected vehicle.