JP2017217940A - Vehicle turning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a vehicle to stably turn without being affected by the vehicle body gravity center position.SOLUTION: A vehicle turning device comprises: hydraulic cylinders 21A, 21B upper end sides of which are fixed to the vehicle body lower portion at a rear side than the vehicle body gravity center position; shaft support parts 22A, 22B which are disposed in the lower end side of the hydraulic cylinders 21A, 21B; a rotational shaft 23 rotation axis of which is in a vehicle body width direction and which is rotatably and pivotally supported by the shaft support parts 22A, 22B; rotary wheels 24, 25 which are disposed at the rotational shaft 23 capable of integrally rotating; and an electric motor 26 which transmits power to the rotary wheels 24, 25.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a turning device for a vehicle, and more particularly to a turning device for a large vehicle such as a truck.

  Conventionally, as this type of turning device, for example, in Patent Document 1, a plurality of hydraulic cylinders are provided at the lower part of a truck bed, and a turning table is provided at the lower end of each hydraulic cylinder to turn the vehicle in a narrow path or the like. In this case, a technique is disclosed in which the hydraulic cylinder is extended to lift the vehicle body from the road surface and the turning table is rotated to a desired angle.

Japanese Patent Laid-Open No. 5-112214

  By the way, in the conventional technology, the vehicle body is rotated in a state where it is completely lifted from the ground. Therefore, a large jack-up force (push-up force) is required for the hydraulic cylinder particularly during heavy loads such as loading, and the size of the device is increased. There is a problem that causes an increase in vehicle weight.

  Further, in a truck or the like, the position of the center of gravity of the vehicle body changes due to the bias of the luggage loaded on the loading platform. For this reason, in the configuration in which the turning device is provided at a substantially central position in the longitudinal direction of the vehicle body as in the prior art, if the vehicle body is lifted off the ground with the load being loaded unevenly, the balance of the vehicle body is unbalanced during the turning. There is a problem to become stable.

  Furthermore, in the prior art, for example, when the load is loaded behind and behind the platform, even if the hydraulic cylinder is extended, the vehicle body does not lift up from the ground, and the vehicle turns without touching the ground to the ground. there's a possibility that. In particular, since a large vehicle such as a truck has a rear wheel composed of two or more wheels, if the rear wheel is dragged with the ground contacting the ground, the drag resistance becomes excessive, which may cause damage to the rear wheel.

  An object of the technology of the present disclosure is to turn the vehicle stably without being affected by the position of the center of gravity of the vehicle body.

  The technology of the present disclosure includes a hydraulic cylinder whose upper end is fixed to the lower part of the vehicle body behind the center of gravity of the vehicle body and can be expanded and contracted in the vertical direction of the vehicle body, a shaft support portion provided on the lower end side of the hydraulic cylinder, and its rotation A rotating shaft rotatably supported on the shaft support portion, a rotating wheel provided so as to be rotatable integrally with the rotating shaft, and a driving means for transmitting power to the rotating shaft. And when the vehicle is turned in either the left or right direction, the left and right rear wheels of the vehicle are lifted from the ground while the hydraulic cylinder is extended and the left and right front wheels of the vehicle are in contact with the ground. The vehicle body is turned by rotating the rotating wheel integrally with the rotating shaft by a driving means.

  The upper end portion of the hydraulic cylinder may be fixed to a lower housing portion of a differential gear connected to the left and right rear wheels via a drive shaft.

  Further, the driving means may be an electric motor that is driven by electric power supplied from a vehicle-mounted battery.

  According to the technology of the present disclosure, the vehicle can be turned stably without being affected by the position of the center of gravity of the vehicle body.

(A) is the schematic diagram which looked at the vehicle which concerns on this embodiment from the vehicle body side, (B) is the schematic diagram seen from the vehicle body upper direction. It is a typical perspective view which shows the turning apparatus which concerns on this embodiment. It is the schematic diagram which looked at the turning apparatus which concerns on this embodiment from the vehicle body back. It is a typical side view which shows the state which the turning apparatus which concerns on this embodiment act | operated. It is a typical top view explaining the left turning operation | movement of the turning apparatus which concerns on this embodiment. It is a typical top view explaining the right turning operation | movement of the turning apparatus which concerns on this embodiment.

  Hereinafter, a vehicle according to an embodiment of the present invention will be described with reference to the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  As shown in FIG. 1, the vehicle 1 according to the present embodiment is a cab-over type truck in which a cab 2 is arranged on an upper part of an engine 10, and a loading platform 3 is mounted on a chassis frame 4 behind the cab 2. . In addition, the kind of the loading platform 3 is not limited to the van body of the example of illustration, A flat body may be sufficient.

  The output shaft of the engine 10 is connected to the input shaft of the transmission 12 via the clutch 11. The output shaft of the transmission 12 is connected to the differential device 14 via the propeller shaft 13. Left and right drive shafts 15L and 15R are connected to the differential device 14, and left and right drive wheels (hereinafter, left and right rear wheels) 16L and 16R are connected to the drive shafts 15L and 15R, respectively. In the figure, reference numerals 17L and 17R denote steered wheels (hereinafter, left and right front wheels).

  In the present embodiment, a turning device 20 that turns the vehicle 1 is provided below the differential device 14 behind the center of gravity of the vehicle body when the vehicle 1 is empty. Hereinafter, the detail of the turning apparatus 20 of this embodiment is demonstrated.

  As shown in FIGS. 2 and 3, the turning device 20 has a base end (upper end) side fixed to the lower surface of the housing 14 </ b> A of the differential device 14 and is moved in the vertical direction of the vehicle body by operating hydraulic pressure supplied from a hydraulic supply source not shown. A pair of front and rear hydraulic cylinders 21A and 21B that extend and contract, a pair of front and rear shaft support portions 22A and 22B fixed to the front end (lower end) side of the hydraulic cylinders 21A and 21B, and extend in the vehicle body front-rear direction. A rotating shaft 23 rotatably supported by 22A and 22B, a wheel 24 fixed to the rotating shaft 23, a solid tire 25 attached to the wheel 24, and a rotating shaft 23 connected to the rotating shaft 23 and an in-vehicle vehicle not shown. An electric motor 26 driven by power supplied from the battery, and a left turn button 27A and a right turn button 27B provided in the cab 2 (shown in FIG. 1). That the operation switch 27 and a (shown only in FIG. 3).

  When the left turn button 27A of the operation switch 27 is turned on, as shown in FIG. 4, the hydraulic cylinders 21A and 21B extend downward, so that the left and right rear wheels 16L and 16R are lifted from the ground. At this time, the vehicle 1 assumes a forward leaning posture, and the left and right front wheels 17L and 17R are maintained in contact with the ground.

  Next, the electric motor 26 is driven clockwise as viewed from the rear of the vehicle body. As a result, the solid tire 25 also rotates clockwise together with the rotating shaft 23, so that the vehicle 1 can move to the left and right front wheels as shown in FIG. The vehicle is turned counterclockwise as viewed from above the vehicle body with 17L and 17R as fulcrums.

  When the vehicle 1 turns to a desired position and the left turn button 27A is turned OFF, the hydraulic cylinders 21A and B contract, and the left and right rear wheels 16L and 16R come in contact with the ground again, so that the vehicle 1 turns left. The operation is to be terminated.

  On the other hand, when the right turn button 27B of the operation switch 27 is turned on, the left and right rear wheels 16L and 16R are lifted from the ground by the extension of the hydraulic cylinders 21A and 21B, as in the case of the left turn operation shown in FIG. The left and right front wheels 17L and 17R are maintained in a state where they are installed on the ground.

  Next, the electric motor 26 is driven counterclockwise as viewed from the rear of the vehicle body. As a result, the solid tire 25 is also rotated counterclockwise integrally with the rotary shaft 23, so that the vehicle 1 is The vehicle is turned clockwise with the left and right front wheels 17L and 17R as fulcrums when viewed from above the vehicle body.

  When the vehicle 1 turns to a desired position and the right turn button 27B is turned OFF, the hydraulic cylinders 21A and 21B contract, and the left and right rear wheels 16L and 16R come into contact with the ground again. The turning operation is finished.

  As described above in detail, according to the present embodiment, the turning device 20 is disposed below the differential device 14 at the rear of the vehicle body center of gravity when the vehicle 1 is empty, so that each hydraulic cylinder can be operated during a left and right turning operation. When 21A and 21B are extended, the left and right rear wheels 16L and 16R are lifted from the ground, and the left and right front wheels 17L and 17R are configured to be maintained in a state of being reliably grounded to the ground.

  That is, the jack-up force required for each of the hydraulic cylinders 21A and 21B is compared to the conventional technique in which the left and right front wheels 17L and 17R are grounded to the ground and used as the rotation fulcrum during the left and right turning operation, so that the vehicle body is completely lifted from the ground. (Push-up force) can be reduced, and the increase in the size of the device and the accompanying increase in vehicle weight can be effectively suppressed.

  In addition, since the vehicle body is configured to be securely supported at the three positions of the left and right front wheels 17L and 17R and the solid tire 25 during the left and right turning operation, the load can be loaded on the loading platform 3 in any of the front, rear, left and right directions. The vehicle can be turned with stable balance.

  In addition, since the turning device 20 is disposed behind the center of gravity of the vehicle body when the vehicle 1 is unloaded, the left and right rear wheels 16L, It is possible to reliably lift the 16R from the ground, and it is possible to effectively prevent the left and right rear wheels 16L and 16R from being damaged by dragging.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, the drive source of the turning device 20 is not limited to the electric motor 26, and the drive of the engine 10 taken out from a drive pinion gear (not shown) of the differential device 14 or a counter gear (not shown) of the transmission 12 via a PTO shaft or the like. You may comprise so that force may be transmitted to the rotating shaft 23. FIG. In this case, the transmission 11 may be geared in the forward gear / reverse gear according to the left turn / right turn operation.

  Further, the position where the turning device 20 is provided is not limited to the lower portion of the differential device 14, and is, for example, bridged between a pair of chassis frames 4 as long as it is behind the center of gravity of the vehicle body when the vehicle 1 is unloaded. Alternatively, it may be provided at other portions of the vehicle 1 such as a lower surface of a cross member (not shown).

  The tire 25 is not limited to a solid type, and may be a pneumatic tire.

  The vehicle 1 is not limited to a truck, and can be widely applied to other vehicles such as buses and passenger cars.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Cab 3 Loading platform 10 Engine 11 Clutch 12 Transmission 13 Propeller shaft 14 Differential device 15L, 15R Drive shaft 16L, 16R Rear wheel 17L, 17R Front wheel 20 Turning device 21A, 21B Hydraulic cylinder 22A, 22B Shaft support 23 Rotating shaft 24 Wheel 25 Solid tire 26 Electric motor 27 Operation switch

Claims (3)

A hydraulic cylinder whose upper end is fixed to the lower part of the vehicle body behind the center of gravity of the vehicle body and can extend and contract in the vertical direction of the vehicle body;
A shaft support provided on the lower end side of the hydraulic cylinder;
The rotation axis is directed in the vehicle body width direction, and the rotation shaft is rotatably supported by the shaft support portion.
A rotating wheel provided integrally rotatable on the rotating shaft;
Drive means for transmitting power to the rotating shaft,
When the vehicle is turned in either the left or right direction, the left and right rear wheels of the vehicle are lifted from the ground while the hydraulic cylinder is extended and the left and right front wheels of the vehicle are in contact with the ground, and the driving means rotates the rotation. A vehicle turning device characterized in that a vehicle body is turned by rotating a wheel integrally with the rotating shaft. The vehicle turning device according to claim 1, wherein an upper end portion of the hydraulic cylinder is fixed to a lower housing portion of a differential gear connected to the left and right rear wheels via a drive shaft. The turning device for a vehicle according to claim 1 or 2, wherein the driving means is an electric motor that is driven by electric power supplied from an in-vehicle battery.

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