JP6584826B2 - Carrier cab suspension device - Google Patents

Description

  The present invention relates to a cab suspension device for a carrier that supports a driver's cab (hereinafter also referred to as “cabin” or “cab”) attached to the front end of a carrier having a large cargo bed.

In general, a carrier having a large cargo bed is used for transporting heavy objects such as coils produced in an ironworks or the like in a factory. The carrier is provided with a large loading platform that extends horizontally in the front-rear direction in order to efficiently carry more heavy objects. The floor of the loading platform is set as low as possible to carry pallets loaded with coils and the like. For this reason, a structure is often adopted in which a plurality of wheels supporting the loading platform are reduced in diameter and arranged in the front-rear direction, and each wheel is supported by a hydraulic cylinder fixed to the loading platform. In addition, the engine that drives the wheels is often disposed on a subframe formed to overhang forward from the front end of the loading platform. In this case, the cabin avoids interference with the engine on the subframe. It is arranged at a position eccentric from the center of the vehicle in the left-right direction.
Therefore, the vibration from the road surface is easily transmitted to the loading platform directly from each wheel through the hydraulic cylinder. In particular, when no heavy load is loaded on the loading platform (so-called empty loading status), Easily picks up vibrations based on minute irregularities on the road surface, and the vibrations are easily transmitted to the cabin. In addition, the cabin overhangs forward from the front end of the loading platform and is eccentric from the center of the vehicle in the left-right direction, so that the shaking and vibration of the loading platform are amplified unevenly in the front, rear, left and right and are easily transmitted to the cabin. There was a problem of lowering the ride comfort of the cabin.

  In this regard, in particular, in a large truck or the like, a technique is known in which an air spring is provided between the cabin and the frame to improve the riding comfort of the cabin (see, for example, Patent Document 1). As shown in FIG. 7, the cab suspension apparatus 100 of Patent Document 1 includes a plurality of air bellows (air springs) 101, 102, 103, and 104. The cab suspension apparatus 100 includes an air bellows (air spring) and an air supply tank. Solenoid valves 106 and 107 formed integrally with the leveling valve are provided between 105 and 105. Stroke sensors 108 and 109 are attached to the front and rear of the cab one by one. If exceeded, it includes a control device 110 configured to close the solenoid valve. In addition, when the brake signal 111 is input while the vehicle is traveling, the control device 110 instructs the solenoid valves 106 and 107 to close, and enters the air bellows (air springs) 101, 102, 103, and 104. Air supply and exhaust are shut off to mitigate the cab nose dive phenomenon during braking.

Japanese Patent Laid-Open No. 11-20447

However, the cab suspension device 100 of the above-mentioned patent document 1 is a solenoid valve when the amount of cab stroke in the vertical direction measured by the stroke sensors 108 and 109 attached to the front and rear of the cab exceeds a predetermined stroke range. The structure is such that air is not supplied to the air bellows (air springs) 101, 102, 103, 104 by closing the 106, 107. For this reason, the air bellows (air spring) is not supplied with adequate air for large vertical vibrations or vertical uneven vibrations exceeding the predetermined range of the cab's vertical stroke, and sufficient riding comfort cannot be obtained. was there.
In addition, when the brake signal 111 is input while the vehicle is traveling, the control device 110 instructs the solenoid valves 106 and 107 to close, and enters the air bellows (air springs) 101, 102, 103, and 104. Since the air supply and exhaust are shut off, for example, when the vehicle is operated frequently at low speed in a factory and the brake is frequently operated, the cab is repeatedly swung horizontally until the nose dive phenomenon does not occur. There is a possibility that the riding comfort may deteriorate due to movement or inclination.
Further, since the cab suspension device 100 requires various sensors, electromagnetic valves, and the like and a control device for operating them, the control of the cab suspension device is complicated and there is a problem of an increase in cost.

  The present invention has been made to solve such a problem, and can relieve various vibrations of the cabin in the vertical direction without limiting the amplitude, and can also prevent the cabin from swinging or tilting in the horizontal direction. It is an object of the present invention to provide a cab suspension device for a carrier that can be easily suppressed.

In order to achieve the above object, a carrier cab suspension apparatus according to the present invention comprises the following arrangement.
(1) Air springs, which are respectively mounted on the front and rear left and right sides of the cabin, are mounted on the subframe extending at the front end of the loading platform supported by a plurality of wheels and eccentrically mounted in the left and right direction with respect to the vehicle center. A cab suspension device for a carrier that is suspended from the sub-frame and supplies and exhausts air by opening and closing a leveling valve connected to the air spring,
The cabin is connected to the sub-frame via a plurality of connecting members extending horizontally;
The lever of the leveling valve is connected to the cabin via a link bar extending vertically.

In the present invention, since the cabin is connected to the subframe via a plurality of connecting members extending horizontally, the cabin can be prevented from swinging or tilting in the horizontal direction with respect to the subframe. For this reason, for example, when the carrier frequently operates the brake while traveling at a low speed in the factory, not only does the nose dive phenomenon occur, but the cabin swings or tilts in the front-rear direction (horizontal direction). This can reduce the risk of worsening the ride comfort. Further, even if the carrier turns in the left-right direction while traveling, the swinging or tilting of the cabin in the left-right direction (horizontal direction) can be suppressed.
In addition, since the lever of the leveling valve is connected to the cabin via a vertically extending link rod, the opening and closing of the leveling valve can be linked without limiting the amplitude against the vertical vibration of the cabin. Can be made. Therefore, with respect to the vibration in the vertical direction of the cabin, the vibration can be reduced in a wide range from a region having a small amplitude to a region having a large amplitude, and high riding comfort can be obtained. In addition, since the lever of the leveling valve is only connected to the cabin via a link rod extending vertically, various sensors, solenoid valves, etc. and a control device for operating them are not required, and the air spring Supply and exhaust can be easily controlled.
Therefore, according to the present invention, a carrier cab suspension that can alleviate various vibrations of the cabin in the vertical direction without limiting the amplitude and can easily suppress the swinging or tilting of the cabin in the horizontal direction. An apparatus can be provided.

(2) In the carrier cab suspension apparatus described in (1),
The leveling valve is separately connected to one first leveling valve connected integrally to the left and right air springs disposed on the front end side of the cabin and to the left and right air springs disposed on the rear end side of the cabin. And two second leveling valves.

In the present invention, the leveling valve is separately provided in one first leveling valve connected integrally to the left and right air springs arranged on the front end side of the cabin and on the left and right air springs arranged on the rear end side of the cabin. Since it is composed of two connected second leveling valves, even if the shaking and vibration of the loading platform are amplified unevenly in the front, rear, left and right and transmitted to the cabin, the two second leveling valves close to the loading platform The difference between left and right vibrations can be absorbed, and the first leveling valve far from the loading platform can absorb the vibration of the cabin and the difference between before and after vibrations. Therefore, vibration can be further suppressed while maintaining the horizontal state of the cabin.
As a result, various vibrations of the cabin in the up-and-down direction can be further relaxed without limiting the amplitude, and the cabin can be more easily suppressed from swinging or tilting in the horizontal direction.

(3) In the carrier cab suspension device described in (1) or (2),
The connecting member includes a first connecting member extending in the front-rear direction on the cabin front end side, and a second connecting member extending in the front-rear direction on the cabin rear end side, and the second connecting portion includes The cabin and the subframe are coupled at a position higher than the first coupling member.

  In the present invention, the connecting member includes a first connecting member extending in the front-rear direction on the cabin front end side, and a second connecting member extending in the front-rear direction on the cabin rear end side, and the second connecting member Since the cabin and the subframe are coupled at a position higher than the first coupling member, the forward movement of the cabin is restricted while the brake is activated while the carrier is running, and the cabin is moved forward. Can be effectively suppressed. Therefore, it is possible to further suppress the vibration while further maintaining the horizontal state of the cabin.

(4) In the carrier cab suspension apparatus described in any one of (1) to (3),
A damper member is mounted between the cabin and the subframe adjacent to the air spring.

  In the present invention, since the damper member is mounted adjacent to the air spring between the cabin and the subframe, the vibration suppression effect of the air spring is enhanced, and vibration with a minute amplitude that does not open and close the leveling valve is provided. It can be relaxed by the damper member. Therefore, it is possible to further suppress the vibration with a small amplitude while further maintaining the horizontal state of the cabin.

  According to the present invention, it is possible to provide a cab suspension device for a carrier that can reduce the vibration of the cabin in the vertical direction without limiting the amplitude and can easily suppress the swing of the cabin in the horizontal direction. it can.

It is a side view of the carrier which concerns on embodiment of this invention. It is a front view of the carrier shown in FIG. It is a top view of the cab suspension apparatus in the carrier shown in FIG. It is a side view of the cabin and cab suspension apparatus shown in FIG. It is a front view of the cabin and cab suspension apparatus shown in FIG. It is a rear view of the cabin and cab suspension apparatus shown in FIG. 2 is an overall configuration diagram of an air circuit and an electric circuit in a cab suspension device of Patent Document 1. FIG.

  Next, a cab suspension device for a carrier according to an embodiment of the present invention will be described in detail with reference to the drawings. First, the overall configuration of the carrier according to the present embodiment will be described, and then the detailed structure of the cab suspension device will be described.

<Overall configuration of carrier>
First, the overall configuration of the carrier according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 shows a side view of a carrier according to an embodiment of the present invention. FIG. 2 shows a front view of the carrier shown in FIG.

  As shown in FIGS. 1 and 2, the carrier 10 according to this embodiment includes a large loading platform 1 and a cabin 2. The loading platform 1 is suspended from a deck unit 11 on which a heavy object (for example, a luggage of about 100 to 150 tons) is loaded, a plurality of suspension devices 14 and 15 supported on the lower end of the deck unit 11, and the suspension devices 14 and 15. Wheel 12, 13. The suspension devices 14 and 15 include suspension brackets 141 and 151 connected to the deck portion 11, swing arms 142 and 152 that are pivotally attached to lower ends of the suspension brackets 141 and 151 so as to be swingable in the vertical direction, And hydraulic cylinders 143 and 153 for raising and lowering connected to the arms 142 and 152. Wheels 12 and 13 are pivotally attached to the other ends of the swing arms 142 and 152. As the hydraulic cylinders 143 and 153 expand and contract, the swing arms 142 and 152 swing up and down, and the wheels 12 and 13 can move up and down. The deck portion 11 extends horizontally in the front-rear direction, the wheel 13 disposed at the center in the front-rear direction is a drive wheel, and the plurality of wheels 12 disposed before and after the drive wheel are driven wheels. The suspension device 14 that suspends the wheel 12 of the driven wheel is connected to the deck portion 11 so as to be able to turn in the horizontal direction. The suspension device 14 is equipped with a steering mechanism for turning the suspension bracket 141 in a horizontal direction by a steering motor (not shown) to steer the wheels 12.

In addition, subframes 16 and 17 extending forward and upward are formed at the front end of the deck portion 11. An engine chamber 19 for storing an engine (not shown) connected to the drive wheels and the drive shaft 18 is formed on the subframe 16 extending forward, and interference with the engine chamber 19 is avoided. The cabin 2 is mounted on the upper right position. As a result, the cabin 2 overhangs forward from the front end of the loading platform 1 and is eccentrically arranged in the left-right direction (here, the right direction (see FIG. 2)) from the vehicle center. Further, the subframe 16 is formed with lower rigidity (strength) than the deck portion 11 because no heavy objects are loaded thereon. Therefore, the carrier 10 has a unique structure in which the shaking and vibration of the loading platform 1 are amplified unevenly in the front, rear, left and right directions and easily transmitted to the cabin 2.
Further, the subframe 17 extended upward is extended to the same height as the cabin so that the cargo loaded on the loading platform 1 does not collide with the cabin 2.

  The deck unit 11 is loaded with, for example, a heavy object such as a coil produced at an ironworks or the like. The carrier 10 is used mainly for transporting heavy objects in a factory such as a steel mill. A driver's seat is provided in the cabin 2, and the driver gets on and drives the carrier vehicle 10. Therefore, the cab suspension device 20 described below is mounted on the carrier 10 in order to maintain the cabin 2 in a horizontal state and reduce the vibration to ensure the ride comfort of the driver while taking the above-described unique structure into consideration. ing.

<Cab suspension device>
Next, a cab suspension device for a carrier according to the present embodiment will be described with reference to FIGS. FIG. 3 is a plan view of the cab suspension device in the carrier shown in FIG. FIG. 4 shows a side view of the cabin and cab suspension device shown in FIG. FIG. 5 shows a front view of the cabin and cab suspension device shown in FIG. FIG. 6 shows a rear view of the cabin and cab suspension device shown in FIG.

  As shown in FIGS. 3 to 6, the cab suspension apparatus 20 includes an air spring 3, a leveling valve 4, a connecting member 5, and a damper member 6. The air spring 3 is a spring device that uses the elasticity of compressed air, and is disposed one by one on the front, rear, left, and right sides of the cabin 2. Mounting seats 21 and 22 are formed outwardly on the front left and right and rear end left and right of the cabin 2, respectively, and an air spring 3 is mounted between the mounting seats 21 and 22 and the subframe 16. The left and right pitches of the air springs 33 and 34 mounted on the rear end side of the cabin 2 are set wider than the left and right pitches of the air springs 31 and 32 mounted on the front end side of the cabin 2. This is because it is easy to deal with uneven shaking and vibration left and right from the loading platform 1.

  The leveling valve 4 includes one first leveling valve 41 connected integrally with left and right air springs 31 and 32 disposed on the cabin front end side, and left and right air springs 33 and 34 disposed on the cabin rear end side. And two second leveling valves 42 and 43 connected separately. Each leveling valve 4 (41, 42, 43) is fixed to the subframe 16.

  The levers 411, 421, 431 of the leveling valves 4 (41, 42, 43) are respectively arranged horizontally, and are connected to the cabin via link rods 412, 422, 432 extending vertically from the tip portions thereof. 2 is connected. The levers 411, 421, 431 of the leveling valve 4 and the link rods 412, 422, 432 are connected by a universal joint. The link rods 412, 422, 432 and the cabin 2 are also connected by a universal joint. Each link bar 412, 422, 432 is formed to be adjustable in length.

  Therefore, when the cabin 2 vibrates in the vertical direction, the link rods 412, 422, 432 move in the vertical direction, and the levers 411, 421, 431 of the leveling valve 4 to which the link rods are connected rotate in the vertical direction. Let When the lever rotates upward, the exhaust port of the leveling valve 4 is opened, and the air in the air spring 3 is discharged from the exhaust port. When the lever is rotated downward, the air supply port of the leveling valve 4 is opened, and air is supplied into the air spring 3 from an air supply tank (not shown). Accordingly, the leveling valve 4 operates in conjunction with the vertical vibration of the cabin 2 to supply and exhaust air in the air spring 3 to suppress the vibration of the cabin 2.

  In addition, the link bar 412 connected to the lever 411 of the first leveling valve 41 is connected at the left and right center position of the front end of the cabin, and the link bars 422 and 432 connected to the levers 421 and 431 of the second leveling valves 42 and 43. Are connected at positions that are equally spaced in the left-right direction from the left-right center of the rear end of the cabin. Therefore, even if the shaking and vibration of the loading platform 1 are amplified unevenly in the front, rear, left and right and transmitted to the cabin 2, the left and right differences in the shaking and vibration of the cabin 2 are reduced by the two second leveling valves 42 and 43 close to the loading platform 1. The first leveling valve 41 that absorbs and is far from the loading platform 1 can absorb the vibration of the cabin 2 and the difference in vibration before and after.

  The connecting member 5 extends horizontally between the cabin 2 and the subframes 16, 17 in the front-rear direction and the left-right direction, and connects the cabin 2 and the subframes 16, 17. The connecting member 5 is formed such that a rod-shaped body having a predetermined length can be adjusted in length at both ends thereof and can be bolted. Rubber members are fitted to both ends of the rod-shaped body. The connecting member 5 includes a first connecting member 51 extending horizontally in the front-rear direction on the cabin front end side, a second connecting member 52 extending horizontally in the front-rear direction on the cabin rear end side, and the cabin front end A third connecting member 53 extending horizontally in the left-right direction on the side, and a fourth connecting member 54 extending horizontally in the left-right direction on the cabin rear end side.

  The first connecting member 51 is bolted at one end to a mounting portion 23 projecting under the floor on the front end side in the vicinity of both ends of the cabin 2 in the left-right direction, and the other end of the sub-frame 16 formed along the floor below the cabin 2. It is bolted. The second connecting member 52 is bolted at one end to a mounting portion 24 projecting from the rear side surface at both left and right ends of the cabin 2, and the other end is bolted to the subframe 17 formed along the back surface of the cabin 2. It is tightened. Here, the second connecting member 52 is connected to the sub frames 16 and 17 at a position higher than the first connecting member 51.

  Therefore, even when the brake is operated while the carrier 10 is traveling, the first connecting member 51 and the second connecting member 52 restrict the forward movement of the cabin 2 by the first connecting member 51 and mainly the cabin by the second connecting member 52. Lowering of the front end side can be effectively suppressed. In addition, since the third connecting member 53 and the fourth connecting member 54 extend horizontally in the left-right direction and connect the cabin 2 and the subframe 16, the carrier 10 moves in the left-right direction while traveling. Even when the vehicle is turned to the right, the swing of the cabin 2 in the horizontal direction (left-right direction) can be suppressed.

  The damper member 6 is mounted between the cabin 2 and the subframe 16 at a position adjacent to each air spring 3. Each damper member 6 (61, 62, 63, 64) is a cylinder type oil damper formed in the vertical direction, and enhances the vibration damping effect of each air spring 3 (31, 32, 33, 34). The damper member 6 can mitigate vibrations with minute amplitudes that do not open and close the leveling valve 4 (41, 42, 43).

<Effect>
As described above, according to the cab suspension device 20 of the carrier 10 according to the present embodiment described in detail, the cabin 2 is connected via the plurality of connecting members 5 (51, 52, 53, 54) extending horizontally. Since it is connected to the subframes 16 and 17, it is possible to suppress the horizontal swing and inclination of the cabin 2 with respect to the subframes 16 and 17. For this reason, for example, when the carrier 10 frequently operates the brake while traveling at a low speed in the factory, not only does the nose dive phenomenon occur, but the cabin 2 swings back and forth (horizontal direction) or It is possible to reduce the possibility of inclining and deteriorating riding comfort. Even if the carrier 10 turns in the left-right direction while traveling, the swinging or tilting of the cabin 2 in the left-right direction (horizontal direction) can be suppressed.
Further, since the levers 411, 421, 431 of the leveling valve 4 (41, 42, 43) are connected to the cabin 2 via link bars 412, 422, 432 extending vertically, the upper and lower sides of the cabin 2 The opening and closing of the leveling valve 4 can be interlocked without limiting the amplitude with respect to the vibration in the direction. Therefore, with respect to the vertical vibration of the cabin 2, the vibration can be relaxed in a wide range from a region having a small amplitude to a region having a large amplitude, and a high riding comfort can be obtained.
Further, since the levers 411, 421, 431 of the leveling valve 4 are merely connected to the cabin 2 via the link rods 412, 422, 432 extending vertically, various sensors, solenoid valves, etc. and their operations are operated. Therefore, the supply / exhaust to the air spring can be easily controlled without the need for a control device.
Therefore, according to the present embodiment, the carrier that can alleviate various vibrations of the cabin 2 in the vertical direction without limiting the amplitude and can easily suppress the swing or inclination of the cabin 2 in the horizontal direction. Ten cab suspension devices 20 can be provided.

Further, according to the present embodiment, the leveling valve 4 is disposed on the cabin rear end side, with the first leveling valve 41 integrally connected to the left and right air springs 31 and 32 disposed on the cabin front end side. The left and right air springs 33 and 34 are separately connected to the second leveling valves 42 and 43, so that the shaking and vibration of the loading platform 1 are amplified unevenly in the front and rear and right and left and transmitted to the cabin 2. However, the two second leveling valves 42 and 43 close to the loading platform 1 absorb the difference in the left and right of the shaking and vibration of the cabin 2, and the first first leveling valve 41 far from the loading platform 1 before and after the shaking and vibration of the cabin 2. The difference can be absorbed. Therefore, vibration can be further suppressed while maintaining the horizontal state of the cabin 2.
As a result, various vibrations of the cabin 2 in the vertical direction can be further relaxed without limiting the amplitude, and the swinging or tilting of the cabin 2 in the horizontal direction can be more easily suppressed.

  Moreover, according to this embodiment, the connection member 5 includes a first connection member 51 extending in the front-rear direction on the cabin front end side, and a second connection member 52 extending in the front-rear direction on the cabin rear end side. And the second connecting member 52 connects the cabin 2 and the subframes 16 and 17 at a position higher than the first connecting member 51. Therefore, even when the brake is actuated while the carrier 10 is running, the cabin The frontward inclination of the cabin can be effectively suppressed while restricting the forward movement of 2. Therefore, it is possible to further suppress the vibration while further maintaining the horizontal state of the cabin 2.

  Further, according to the present embodiment, the damper member 6 (61, 62, 63, 64) is disposed between the cabin 2 and the subframe 16 adjacent to the air spring 3 (31, 32, 33, 34). Since it is mounted, the vibration damping effect of the air spring 3 can be enhanced, and vibration with a minute amplitude that does not open or close the leveling valve 4 can be mitigated by the damper member 6. Therefore, it is possible to further suppress the vibration with a minute amplitude while further maintaining the horizontal state of the cabin 2.

  Although the cab suspension device 20 of the carrier 10 according to the present embodiment has been described in detail above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. For example, in the present embodiment, the first leveling valve 41 is integrally connected to the left and right air springs 31 and 32 disposed on the cabin front end side. However, the first leveling valve 41 is not necessarily limited to this, and the first leveling valve 41 is not necessarily limited thereto. May be prepared and connected to the left and right air springs 31 and 32 separately. Even on the front end side of the cabin 2, it is possible to absorb the left-right difference in the vibration and vibration of the cabin 2.

1 Loading platform 2 Cabins 3, 31, 32, 33, 34 Air springs 4, 41, 42, 43 Leveling valve 41 First leveling valve 42, 43 Second leveling valves 5, 51, 52, 53, 54 Connecting member 51 First Connecting member 52 Second connecting member 6, 61, 62, 63, 64 Damper member 10 Carrier 11 Deck portion 12, 13 Wheels 14, 15 Suspension device 16, 17 Subframe 20 Cab suspension devices 411, 421, 431 Lever 412, 422 432 Link stick

Claims (3)

Cabins mounted eccentrically in the left-right direction with respect to the center of the vehicle are mounted on the sub-frame extending at the front end of the loading platform supported by the plurality of wheels by the air springs respectively disposed on the front, rear, left and right of the cabin. A cab suspension device for a carrier suspended from a frame and supplying / exhausting air by opening / closing a leveling valve connected to the air spring,
The cabin is connected to the sub-frame via a plurality of connecting members extending horizontally;
The lever of the leveling valve is connected to the cabin via a link rod extending vertically ;
The leveling valve is separately connected to one first leveling valve connected integrally to the left and right air springs disposed on the front end side of the cabin and to the left and right air springs disposed on the rear end side of the cabin. A cab suspension device for a carrier comprising two second leveling valves . In the carrier of the cab suspension system according to claim 1,
The connecting member includes a first connecting member extending in the front-rear direction on the cabin front end side, and a second connecting member extending in the front-rear direction on the cabin rear end side, and the second connecting portion includes The carrier cab suspension device is connected to the subframe at a position higher than the first connecting member. In the cab suspension apparatus of the carrier of Claim 1 or Claim 2 ,
A cab suspension device for a carrier, wherein a damper member is mounted adjacent to the air spring between the cabin and the subframe.

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