JP2018043657A - Movable bumper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable bumper device with a bumper that is located at a rear end of a vehicle and near the ground surface during traveling and is largely moved forward to prevent contact with other working vehicles or the like when stored.SOLUTION: A movable bumper device includes: a bumper 2 provided in a vehicle 50; an extendable support section 10 provided to be extendable in inner and outer directions of the vehicle 50 to support the bumper 2; extending drive means 15 for extending the extendable support section 10; a support shaft 20 for rotatably supporting the extendable support section 10 to a frame 51 of the vehicle 50; and rotating drive means 30 for rotating the extendable support section 10 by driving the support shaft 20. When the extendable support section 10 is contracted by the extending drive means 15, the bumper 2 is moved from a predetermined position during traveling to the inner direction of the vehicle 50, and when the extendable support section 10 is rotated by the rotating drive means 30, the bumper is further moved to the inner upper side of the vehicle 50 and stored.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a movable bumper device provided in a vehicle such as a dump truck.

  Cargo vehicles such as dump trucks will have rush prevention devices, pedestrians, bicycles, etc. caught in the rear wheels to prevent other cars that collide from behind from entering the lower part of the frame. An anti-rolling device for preventing the occurrence of the problem is provided. These intrusion prevention devices and entanglement prevention devices must be mounted at appropriate positions so that they function effectively and safety performance is not impaired. This is also stipulated in the safety standards for road transport vehicles.

  However, the intrusion prevention device and the entanglement prevention device described above sometimes come into contact with other work vehicles or the like during construction or cargo handling work. Specifically, for example, in a dump truck that tilts the cargo box rearward and discharges the load from the rear, a bumper as a rush prevention device provided at the rear of the vehicle is connected from the rear during asphalt pavement construction. There is a problem of contact with asphalt finishers.

  In order to eliminate the problem of bumpers etc. coming in contact with other work vehicles as described above and getting in the way, it has been possible to change between the use position in the normal running state and the storage position during work, etc. A movable bumper device is known.

For example, Patent Document 1 discloses a movable bumper device configured to be driven by an air cylinder and to have a rear bumper pivoted forward and stored below the vehicle body.
Further, for example, Patent Document 2 discloses a movable bumper that is rotated rearward and upward by a manual operation and is stored behind the side frame.
Further, for example, Patent Document 3 discloses a liftable rear bumper that is movable up and down and driven by a hydraulic cylinder that is extendable in the vertical direction.
Further, for example, Patent Document 4 discloses a rear bumper that is supported by an arm that is slidable in the front-rear direction in a box below the frame and is slid forward and stored by manual operation.

JP 2007-276687 A JP 2013-233819 A JP-A-6-247241 JP 2011-31862 A

  However, in the method of storing the bumper by rotating it forward as in the prior art disclosed in Patent Document 1, since the bumper is located below the frame in the storage position, depending on the vehicle type, the bumper and asphalt finisher There was a risk that the front would come into contact. In particular, a relatively small dump truck, for example, a small to medium dump truck with a loading capacity of about 2 to 8 tons has a lower height from the ground to the frame than a large dump truck of about 10 tons. Therefore, even if the bumper is stored below the frame, the height from the ground to the bumper becomes insufficient, and the asphalt finisher comes into contact.

  It is also possible to move the bumper forward by enlarging the radius of rotation, but the space between the rear end of the frame is narrower and smaller for small to medium-sized dump trucks than for large dump trucks. The arrangement of the shaft and the driving device is also limited. For this reason, it has been difficult to employ a configuration in which the bumper is disposed near the rear end of the vehicle and the bumper is largely moved forward during storage in use.

  Also, as in the prior art disclosed in Patent Document 2, with respect to the configuration in which the bumper is rotated rearward and stored behind the frame, the small to medium-sized dump truck has a space near the rear end of the frame. It was narrow and it was difficult to arrange the rotating shaft and arm. In addition, if the bumper is rotated rearward and upward, the bumper may come into contact with the rear end of the cargo box that is inclined backward, the license plate, the taillight, etc., and the bumper may be damaged by the discharged asphalt, etc. There is also a risk of doing.

  Further, in the method of storing the bumper by moving it upward as in the prior art disclosed in Patent Document 3, since the bumper is housed below the frame, the conventional technique disclosed in Patent Document 1 described above There are similar problems. In addition, in a small to medium-sized dump truck, it is difficult to secure a sufficient space for arranging the hydraulic cylinder or the like so as to extend and contract in the vertical direction.

  Further, in the configuration in which the bumper is slid forward together with the arm as in the prior art disclosed in Patent Document 4, a box for slidably supporting the arm is provided below the frame. Could touch the front of the asphalt finisher.

  Further, as in the prior art disclosed in Patent Document 2 or Patent Document 4, in the method of moving the bumper to the storage position by manual operation, for example, the driver of the dump truck gets out of the vehicle as in construction on a highway. It was not possible to use it at the site where it was impossible.

  Further, in the configuration in which the bumper is moved by an air cylinder or a hydraulic cylinder as in the prior art disclosed in Patent Document 1 and Patent Document 3, an air compressor, a hydraulic pump, a tank, a switching control valve, and the like are required. Therefore, there is a problem that the configuration and control of the drive device become complicated and the drive device becomes heavy.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to be close to the rear end of the vehicle and the ground when traveling, and to move greatly forward when in contact with other work vehicles and the like. It is an object of the present invention to provide a movable bumper device including a bumper that can prevent the above.

  The movable bumper device of the present invention includes a bumper provided in a vehicle, an expansion / contraction support portion that is provided to be extendable / contractible in the vehicle inside / outside direction and supports the bumper, and an expansion / contraction drive means for extending / contracting the expansion / contraction support portion, A rotation support unit that rotatably supports the telescopic support unit with respect to a frame of the vehicle; and a rotation drive unit that drives the rotation support unit to rotate the expansion support unit. The bumper moves inward of the vehicle from a predetermined position during traveling by shortening the expansion / contraction support portion by the expansion / contraction drive means, and the expansion / contraction support portion is rotated by the rotation drive means. The vehicle is further moved and stored inward and upward of the vehicle.

  According to the movable bumper device of the present invention, the bumper moves inward of the vehicle from a predetermined position during traveling by shortening the expansion / contraction support portion by the expansion / contraction drive means, and the rotation drive means When the telescopic support portion is rotated by the above, the vehicle moves further inward and upward and is stored. That is, the bumper can be moved greatly during storage and unfolding by a combination of the expansion / contraction operation of the expansion / contraction support portion and the rotation operation of the rotation support portion. As a result, the bumper is disposed near the rear end of the vehicle and near the ground when traveling, and is largely moved forward and stored during storage. Thus, contact between the bumper and another work vehicle or the like can be prevented.

  Further, since the bumper is moved by suitably combining the expansion and contraction operation and the rotation operation, compared with the movable bumper device of the prior art that uses only the expansion and contraction operation or the rotation operation, devices such as an expansion drive means and a rotation drive means Can be miniaturized. Therefore, even in a vehicle where the height of the frame is relatively low and the space near the rear end of the frame is narrow, the movable bumper device can be suitably arranged so as to avoid contact with other work vehicles and the like.

  In addition, since the vehicle has the expansion / contraction drive means for extending / contracting the expansion / contraction support section and the rotation drive means for driving the rotation support section to rotate the expansion / contraction support section, the driver stores the bumper without getting off the vehicle. And can be deployed. As a result, the work efficiency can be improved, and the bumper can be stored and deployed even at a construction site where the driver cannot get off, and contact between the bumper and other work vehicles can be avoided.

  Further, according to the movable bumper device of the present invention, the telescopic support part is provided slidably inside the outer cylinder supported by the rotation support part and inside the outer cylinder, and the bumper is provided at one end. An expansion cylinder attached to the outer cylinder, an extension motor attached to the outer cylinder, a feed screw shaft driven by the expansion motor, and the inner cylinder connected to the inner cylinder. A feed screw nut that is screwed onto the feed screw shaft. With such a configuration, the movable bumper device is lightweight and has excellent controllability.

  Further, according to the movable bumper device of the present invention, the rotation support portion includes a support shaft that is rotatably provided with respect to the frame, and an arm that connects the support shaft and the telescopic support portion. The rotation drive means may include a rotation motor that rotates the support shaft, and a power transmission mechanism that transmits rotational power from the rotation motor to the support shaft. . Thereby, compared with the movable bumper device of the prior art using a hydraulic cylinder or the like, the control for rotating the bumper is facilitated, and the device can be reduced in size and weight.

It is a side view of (A) rear part of a vehicle provided with a movable bumper device concerning an embodiment of the present invention, and (B) rear view. It is a top view which shows the frame rear end vicinity of the vehicle provided with the movable bumper apparatus which concerns on embodiment of this invention. It is a side view showing the outline of the movable bumper device concerning the embodiment of the present invention. It is a top view which shows the outline of the movable bumper apparatus which concerns on embodiment of this invention. It is a side view which shows the state at the time of (A) driving | running | working of the movable bumper apparatus which concerns on embodiment of this invention, (B) the state by which the expansion-contraction support part was shortened. It is a side view which shows the state which (A) bumper and the expansion-contraction support part of the movable bumper apparatus which concern on embodiment of this invention rotate, (B) the state in which the bumper was stored. It is a side view which shows the state at the time of the asphalt construction work in which the bumper of the movable bumper apparatus which concerns on embodiment of this invention was stored. It is a side view which shows the outline of (A) movable bumper apparatus which concerns on other embodiment of this invention, and (B) arm part. It is a top view which shows the outline of the movable bumper apparatus which concerns on other embodiment of this invention.

Hereinafter, a movable bumper device according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1A is a side view of the vicinity of the rear end of a vehicle 50 including the movable bumper device 1 according to the embodiment of the present invention, and FIG. 1B is a rear view of the vehicle 50, that is, the vehicle 50. It is the figure which looked at from back.

  As shown in FIG. 1A, the vehicle 50 is an example of an automobile including the movable bumper device 1, and is a dump truck including a load box 54 that can be tilted rearward. The movable bumper device 1 is provided in the vicinity of the rear end of the vehicle 50 and is attached to the frame 51 of the vehicle 50 or the like.

  The movable bumper device 1 includes a bumper 2 disposed at a predetermined position near the rear end of the vehicle 50, a telescopic support portion 10 that is provided so as to be stretchable in the front-rear direction of the vehicle 50 and supports the bumper 2, and telescopic support And a support shaft 20 as a rotation support unit that rotatably supports the unit 10 with respect to the frame 51 of the vehicle 50.

  The bumper 2 is a rush prevention device for preventing other automobiles and the like that collide from behind from entering under the frame 51, and is provided behind the rear wheel 55 of the vehicle 50. The position of the bumper 2 during normal traveling is set to a predetermined position so that the bumper 2 functions effectively as a rush prevention device.

That is, the position of the bumper 2 during traveling is preferably such that the height H1 from the ground surface GL to the lower end of the bumper 2 is low and the distance L1 from the rear end of the vehicle 50 to the rear end of the bumper 2 is short. Specifically, according to the safety standards for road transport vehicles, the height H1 must be set to 550 mm or less, and the distance L1 must be set to 400 mm or less.
Further, as shown in FIG. 1B, the bumper 2 extends in the vehicle width direction of the vehicle 50 by a predetermined length, and reaches from the rear of the frame 51 of the vehicle 50 to the rear of the rear wheel 55.

  The shape of the bumper 2 is not particularly limited as long as predetermined height and length dimensions are secured. From the viewpoint of productivity, for example, the bumper 2 is preferably a long member extending in a certain cross-sectional shape. As the cross-sectional shape of the bumper 2, various forms such as a substantially rectangular shape, a substantially circular shape, a substantially U shape, and a substantially L shape can be adopted. In order to reduce the weight while ensuring a predetermined rigidity, the bumper 2 is preferably cylindrical, that is, hollow.

  Further, as the material of the bumper 2, various steel materials, aluminum materials and the like can be used, but aluminum materials are preferable from the viewpoint of weight reduction. Further, a decorative plate made of a stainless steel plate or the like may be attached to the bumper 2 made of an aluminum material or the like.

FIG. 2 is a plan view showing the vicinity of the rear end of the frame 51 of the vehicle 50. As shown in FIG. 2, a frame 51 of the vehicle 50 includes a pair of left and right side rails 52 extending in the front-rear direction and a cross member that is a strength member that extends in the vehicle width direction and connects the left and right side rails 52. 53.
The movable bumper device 1 is provided between the left and right side rails 52 of the vehicle 50 and is fixed to one or both of the side rails 52 and the cross member 53.

  A pair of telescopic support portions 10 are provided on the left and right sides of the frame 51 substantially corresponding to the side rails 52 of the vehicle 50. In other words, the bumper 2 is supported at two locations by a pair of expansion / contraction support portions 10 that can expand and contract in the front-rear direction. The left and right expansion / contraction support portions 10 are provided with expansion / contraction motors 15 for extending / contracting the expansion / contraction support portions 10, respectively.

  FIG. 3 is a side view schematically showing the movable bumper device 1. As shown in FIG. 3, the telescopic support portion 10 that supports the bumper 2 in a telescopic manner includes an outer cylinder 11 that is rotatably supported on a support shaft 20 that is a rotational support portion via an arm portion 21, and an outer cylinder 11. And an inner cylinder 12 which is slidably provided inside the cylinder 11 and to which the bumper 2 is attached at one end.

  The outer cylinder 11 and the inner cylinder 12 have a substantially cylindrical shape such as a substantially cylindrical shape or a substantially rectangular tube shape, for example. An inner cylinder 12 is slidably fitted into the outer cylinder 11 with a predetermined gap. In addition, a guide member 13 such as a slide bearing is slidably supported inside the outer cylinder 11 between the inner peripheral surface of the outer cylinder 11 and the outer peripheral surface of the inner cylinder 12. Provided.

  The outer cylinder 11 and the inner cylinder 12 only need to be configured to be slidable with respect to each other. In addition to a substantially cylindrical shape, the outer cross-section is substantially circular, substantially U-shaped, or substantially L-shaped. Various rod-like bodies such as these may be used. However, the substantially cylindrical outer cylinder 11 and inner cylinder 12 can be provided therein with a ball screw shaft 16 or the like that constitutes an expansion / contraction driving means described later, and foreign matter such as asphalt or mud is disposed on the ball screw shaft 16 or the like. Is excellent in that it can be prevented from adhering.

  A blade 14 slidably contacting the outer peripheral surface of the inner cylinder 12 may be provided in the vicinity of the end of the outer cylinder 11 on the side where the inner cylinder 12 is inserted. The blade 14 is a sealing member having a lip made of synthetic rubber or the like, for example, and the lip is slidably in contact with the outer peripheral surface of the inner cylinder 12 so that asphalt, mud, or the like can enter the outer cylinder 11 from the outside. Prevent entry of foreign matter and moisture.

  In addition, a cover member (not shown) that can extend and contract, such as a bellows shape made of a synthetic resin having flexibility, for example, covering the outer peripheral surface of the inner cylinder 12 may be provided on the outer peripheral portion of the inner cylinder 12. By such a cover member, it is possible to prevent asphalt, mud, and the like from adhering to the outer peripheral surface of the inner cylinder 12 serving as a sliding surface, and it is possible to prevent asphalt and the like from entering the outer cylinder 11. . Therefore, the favorable expansion-contraction operation | movement of the expansion-contraction support part 10 can be maintained.

  The expansion / contraction support unit 10 is provided with expansion / contraction drive means for expanding / contracting the expansion / contraction support unit 10. Specifically, the expansion / contraction drive means includes an expansion / contraction motor 15 attached to the outer cylinder 11, a ball screw shaft 16 driven by the expansion / contraction motor 15, and an inner cylinder 12 connected to the ball screw shaft 16. And a ball screw nut 17 to be used.

  The expansion / contraction motor 15 is, for example, a DC servo motor that can detect the rotational position, and is provided, for example, near the end of the outer cylinder 11 on the side opposite to the side where the inner cylinder 12 is inserted. It is attached via.

  A ball screw shaft 16 as a feed screw shaft is connected to the output shaft of the telescopic motor 15 through a shaft coupling 19. As described above, the ball screw shaft 16 is provided inside the outer cylinder 11 and is rotatably supported by a bearing 18 such as a rolling bearing, for example.

  A ball screw nut 17 as a feed screw nut is screwed onto the ball screw shaft 16 via a rolling element, and the ball screw nut 17 is fixed to the inner cylinder 12. With such a configuration, the inner cylinder 12 of the expansion / contraction support portion 10 can be moved so as to protrude from the outer cylinder 11 by the rotational force of the expansion / contraction motor 15, and can be pulled back into the outer cylinder 11. It becomes the expansion-contraction support part 10 excellent in controllability. Instead of the ball screw shaft 16 and the ball screw nut 17, a sliding screw shaft and a sliding screw nut on which the nut slides and the nut slide may be used as the feed screw shaft and the feed screw nut.

  An arm portion 21 is attached to the outer cylinder 11 of the telescopic support portion 10, and the arm portion 21 is connected to the support shaft 20 provided to be rotatable with respect to the frame 51 as described above. That is, the expansion / contraction support portion 10 is supported to be rotatable with respect to the frame 51.

  The movable bumper device 1 includes a rotation driving unit that drives the support shaft 20 to rotate the telescopic support portion 10. The rotation driving means includes a rotation motor 30 that serves as a drive source for rotating the support shaft 20. The rotation driving means includes a worm reduction gear 32, a chain 34, and sprockets 23 and 33 as a power transmission mechanism that transmits rotational power from the rotation motor 30 to the support shaft 20.

  The rotation motor 30 is, for example, a DC servo motor that can detect the rotation position. The rotation motor 30 may be a motor with a speed reducer provided with a speed reducer or the like so as to exhibit a small and suitable rotational driving force. The output shaft of the rotating motor 30 is connected to the driving shaft of the worm reducer 32 via a shaft coupling 35, and the rotating motor 30 is fixed to the housing of the worm reducer 32 via a support fitting 38. The

  The worm speed reducer 32 has a drive shaft 31 that is a driven-side shaft that is disposed substantially perpendicularly to the driving-side shaft. By adopting the worm speed reducer 32, it is possible to reduce the size of the rotating motor 30 while securing the rotational driving force necessary for rotating the bumper 2 and the telescopic support portion 10. Further, the rotation motor 30 can be arranged with its output shaft directed in the front-rear direction of the vehicle 50, and the movable bumper device 1 can be used by effectively utilizing the limited space near the rear end of the frame 51. Can be arranged. The worm speed reducer 32 is fixed to the cross member 53 or the side rail 52 of the frame 51 via the bracket 39.

  A sprocket 33 is attached to a drive shaft 31 that is a driven shaft of the worm speed reducer 32. A sprocket 23 is attached to the support shaft 20. A chain 34 is wound around the sprocket 33 and the sprocket 23 so that power can be transmitted. Thereby, the rotational driving force by the rotation motor 30 is transmitted to the support shaft 20 via the worm speed reducer 32, the chain 34, and the like. The power transmission mechanism may be composed of, for example, a timing belt and a pulley instead of the chain 34 and the sprockets 23 and 33.

  As described above, the rotational drive means is constituted by the rotation motor 30, the worm speed reducer 32, the chain 34, the sprockets 23, 33, and the like, so that it can be compared with a conventional movable bumper device using a hydraulic cylinder or the like. Control for rotating the bumper 2 becomes easy. In addition, the movable bumper device 1 can be reduced in size and weight.

  FIG. 4 is a plan view showing an outline of the movable bumper device 1. As shown in FIG. 4, the support shaft 20 extends in the vehicle width direction of the vehicle 50, and arm portions 21 that support the telescopic support portion 10 are attached in the vicinity of both ends of the support shaft 20. The support shaft 20 is rotatably supported by a pair of bearings 22 inside a portion where the arm portions 21 in the vicinity of both ends thereof are connected. The bearing 22 is fixed to the cross member 53 or the side rail 52 of the frame 51 via a bracket or the like (not shown). As a result, the support shaft 20 is supported with high strength so as to be rotatable with respect to the frame 51 and to withstand the load of the bumper 2 and the telescopic support portion 10 during traveling and the impact load during collision. The

  The shaft end of the drive shaft 31 protrudes on both the left and right sides of the worm reducer 32, and sprockets 33 are attached to the drive shafts 31 on the left and right sides, respectively. A pair of sprockets 23 and chains 34 attached to the support shaft 20 are also provided so as to be arranged on the left and right of the worm speed reducer 32 corresponding to the sprockets 33. Accordingly, the rotational power of the rotation motor 30 can be efficiently transmitted to the support shaft 20, and the left and right expansion / contraction support portions 10 can be efficiently rotated by one rotation motor 30. The drive shaft 31 protruding from the worm speed reducer 32 is either left or right, and a configuration in which the rotational power of the rotation motor 30 is transmitted to the support shaft 20 by a pair of chains 34 and sprockets 23 and 33 is adopted. Is also possible.

  As described above, the support shaft 20 that rotatably supports the telescopic support portion 10 and the drive shaft 31 of the worm reduction gear 32 connected to the rotation motor 30 are provided separately, and the chain 34 and the sprocket are provided. 23 and 33 are connected. With such a configuration, when the bumper 2 collides with another work vehicle or the like, damage to the drive shaft 31, the worm speed reducer 32, the rotation motor 30, and the like can be prevented. That is, even if a large load acts on the bumper 2 or the like due to a collision or the like, the impact load transmitted from the bumper 2 or the like to the drive shaft 31 or the rotation motor 30 or the like can be suppressed to a small level.

  Further, the bumper 2 may be detachably attached to the inner cylinder 12 of the expansion / contraction support portion 10 using, for example, fastening members such as bolts and nuts. Thereby, when the bumper 2 is damaged due to a collision or the like, the bumper 2 can be easily removed from the inner cylinder 12 and replaced.

Next, the operation of storing the bumper 2 of the movable bumper device 1 will be described in detail with reference to FIGS.
FIG. 5A is a side view showing a state of the movable bumper device 1 when traveling. As shown in FIG. 5A, in the state of traveling, the bumper 2 is at a predetermined height H1 from the ground GL and a predetermined distance L1 from the rear end of the vehicle 50. From this state, in order to connect another construction vehicle or the like such as the asphalt finisher 60 (see FIG. 7), the driver performs an operation for storing the bumper 2, for example, provided in a driver's seat or the like (not shown). Press an operation button.

  Then, the telescopic motor 15 rotates and the ball screw shaft 16 shown in FIG. 3 rotates. As a result, the ball screw nut 17 shown in FIG. 3 moves forward, and the inner cylinder 12 of the telescopic support portion 10 is drawn into the outer cylinder 11.

  FIG. 5B is a side view showing a state in which the telescopic support portion 10 of the movable bumper device 1 is shortened. As shown in FIG. 5 (B), the inner cylinder 12 of the expansion / contraction support section 10 is drawn into the outer cylinder 11 by the expansion / contraction motor 15 and the expansion / contraction support section 10 is shortened. The bumper 2 provided in is moved toward the front. As a result, the bumper 2 moves from the rear end of the vehicle 50 to a position at a distance L2. A distance L2 from the rear end of the vehicle 50 to the bumper 2 is longer than a distance L1 during travel (see FIG. 5A). The dimension corresponding to the difference between the distance L2 and the distance L1 is the expansion / contraction stroke of the expansion / contraction support part 10.

  FIG. 6A is a side view showing a state in which the bumper 2 and the telescopic support portion 10 of the movable bumper device 1 are rotated. After the expansion / contraction support portion 10 is shortened, as shown in FIG. 6A, the rotation motor 30 rotates, and the bumper 2 and the expansion / contraction support portion 10 rotate forward and upward about the support shaft 20. .

  Specifically, referring to FIG. 3, the drive shaft 31 of the worm speed reducer 32 is rotated by the rotational drive force of the rotation motor 30, and the rotational drive force is transferred from the drive shaft 31 to the support shaft 20 via the chain 34 and the like. As a result, the support shaft 20 rotates. Then, as shown in FIG. 6 (A), the telescopic support portion 10 attached to the support shaft 20 via the arm portion 21 rotates.

  FIG. 6B is a side view showing a state in which the bumper 2 of the movable bumper device 1 is stored. As shown in FIG. 6B, driven by the rotation motor 30, the expansion / contraction support section 10 rotates until the expansion / contraction direction becomes substantially vertical. Thus, the bumper 2 is stored at a storage position at a height H2 from the ground GL and a distance L3 from the rear end of the vehicle 50.

  The height H2 of the bumper 2 from the ground GL in the retracted state is higher than the height H1 during travel (see FIG. 5A). Further, the distance L3 from the rear end of the vehicle 50 in the retracted state to the bumper 2 is longer than the distance L1 during travel (see FIG. 5A) and is rotated after the telescopic support portion 10 is shortened. It is longer than the distance L2 (see FIG. 5 (B)) in the state before starting.

  Thus, the bumper 2 is moved inward of the vehicle 50 from a predetermined position during traveling by the telescopic motor 15 being shortened by the telescopic motor 15, and the telescopic motor 30 is rotated by the rotation motor 30. By being moved, the vehicle 50 is further moved inward and stored. The unfolding operation for returning the bumper 2 from the retracted position to the traveling position is the reverse of the retracting operation described with reference to FIGS.

  As described above, according to the movable bumper device 1, the bumper can be moved greatly during storage and deployment by a combination of the expansion / contraction operation of the expansion / contraction support portion 10 and the rotation operation of the support shaft 20. Thereby, the bumper 2 is disposed close to the rear end of the vehicle 50 and the ground GL when traveling, and is largely moved forward and stored during storage.

  FIG. 7 is a side view showing a state during asphalt construction work in which the bumper 2 of the movable bumper device 1 is stored. In a state where the telescopic support portion 10 is shortened and further rotated and stored, the front portion of the asphalt finisher 60 which is another work vehicle is connected to the rear portion of the vehicle 50.

  Specifically, the front portion of the asphalt finisher 60 enters the lower portion of the frame 51 from the rear of the vehicle 50, and the push roller 61 provided at the front end of the asphalt finisher 60 contacts the rear wheel 55 of the vehicle 50. The front portion of the hopper 62 of the asphalt finisher 60 is also inserted below the frame 51 of the vehicle 50.

  As described above, the bumper 2 is moved to the retracted position by the expansion / contraction operation of the expansion / contraction support portion 10 and the rotation operation of the support shaft 20, so that the bumper 2, the expansion / contraction support portion 10 and the like are located at the front portion of the asphalt finisher 60. Problems such as unnecessary contact are avoided.

  In the movable bumper device 1, the bumper 2 is moved by suitably combining the expansion and contraction operation and the rotation operation. Therefore, the movable bumper device 1 is used for expansion and contraction as compared with the conventional movable bumper device using only the expansion and contraction operation or the rotation operation. Devices such as expansion / contraction drive means such as the motor 15 and rotation drive means such as the rotation motor 30 can be reduced in size. Therefore, even in the vehicle 50 in which the height of the frame 51 is relatively low and the space near the rear end of the frame 51 is narrow, the movable bumper device 1 can be suitably arranged so as to avoid contact with the asphalt finisher 60 and the like. it can.

  In addition, the movable bumper device 1 is provided with an expansion drive means such as an expansion / contraction motor 15 that expands / contracts the expansion / contraction support section 10 and a rotation drive such as a rotation motor 30 that drives the support shaft 20 to rotate the expansion / contraction support section 10. And the driver can store and deploy the bumper 2 without getting off the vehicle. As a result, the work efficiency is improved, and the bumper 2 can be stored and deployed even at a construction site where the driver cannot get off, and contact between the bumper 2 and the asphalt finisher 60 can be avoided.

  Next, the movable bumper device 101 will be described in detail with reference to FIGS. 8 and 9 as an example in which the embodiment is modified. FIG. 8A is a side view illustrating an outline of a movable bumper device 101 according to another embodiment of the present invention, and FIG. 8B is a side view of an arm portion 121 of the movable bumper device 101. is there. FIG. 9 is a plan view showing an outline of the movable bumper device 101. In addition, the same code | symbol is attached | subjected about the component which show | plays the same or similar operation | movement and effect as already demonstrated embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 8A, the movable bumper device 101 has an arm portion 121 that connects the drive shaft 31 of the worm reduction gear 32 and the outer cylinder 11 of the telescopic support portion 10. That is, unlike the movable bumper device 1 already described with reference to FIG. 3 and the like, the movable bumper device 101 does not include the chain 34, the sprockets 23 and 33, the support shaft 20, and the like.

  In other words, in the movable bumper device 101, the drive shaft 31 and the expansion / contraction support portion 10 are directly connected by the arm portion 121, and the drive shaft 31 of the worm reduction gear 32 connects the expansion / contraction support portion 10 to the vehicle 50. It becomes a rotation support part supported rotatably with respect to the frame 51. Then, the rotation operation of the drive shaft 31 is directly transmitted as the rotation operation of the telescopic support portion 10 via the arm portion 121. With such a configuration, the number of parts constituting the power transmission mechanism can be reduced, and the movable bumper device 101 can be downsized.

  The arm part 121 has a connection end part 123 connected to the drive shaft 31 and a connection end part 122 connected to the outer cylinder 11 of the telescopic support part 10, as shown in FIG. A portion connecting the connection end 123 and the connection end 122 is curved in a convex shape toward the rear in a side view. As a result, as shown in FIG. 8A, even in the vehicle 50 in which the cross member 53 is disposed in front of the vicinity of the worm speed reducer 32, the arm portion 121 and the cross member 53 are not expanded and contracted. The support portion 10 can be rotated toward the front upper side of the vehicle 50.

  In addition, the movable bumper device 101 includes an expansion / contraction sensor 41 that detects the expansion / contraction state of the expansion / contraction support unit 10. The expansion / contraction sensor 41 is, for example, a proximity switch or the like, is attached to the outer cylinder 11 of the expansion / contraction support unit 10, and detects the position of the inner cylinder 12 that slides inside the outer cylinder 11. Based on the information on the expansion / contraction state detected by the expansion / contraction sensor 41, the expansion / contraction motor 15 that expands / contracts the expansion / contraction support unit 10 may be controlled. Thereby, instead of a DC servo motor or the like that can detect the rotational position, a general DC motor or the like that does not detect the rotational position can be employed as the expansion / contraction motor 15.

  In addition, the movable bumper device 101 includes a rotation sensor 42 that detects the rotation state of the telescopic support unit 10. The rotation sensor 42 is, for example, a proximity switch or the like, and is attached to a bracket 139 or the like that supports the worm speed reducer 32 and detects the arm portion 121 that rotates. Then, based on the information on the rotation state detected by the rotation sensor 42, the rotation motor 30 that rotates the expansion / contraction support portion 10 may be controlled. Thereby, instead of a DC servo motor or the like that can detect the rotational position, a general DC motor or the like that does not detect the rotational position can be employed as the rotation motor 30.

  As shown in FIG. 9, the drive shaft 31 protrudes from both the left and right sides of the worm speed reducer 32 so as to extend in the vehicle width direction of the vehicle 50. The connection end portions 123 of the arm portions 121 are fitted to the left and right drive shafts 31, respectively. The fitting portion between the drive shaft 31 and the connection end portion 123 may be provided with a key, a serration, or the like in order to suppress slipping and ensure transmission of power.

  As described above, the outer cylinder 11 of the telescopic support portion 10 is connected to the other connection end portion 122 of the arm portion 121. The connection end portion 122 and the outer cylinder 11 may be fastened by a fastening member such as a bolt and a nut, or may be joined by welding or the like.

  The bumper 2 is supported by the pair of left and right expansion / contraction support portions 10 supported by the arm portions 121, respectively. In addition, the recessed part 2a dented toward back may be formed in the vicinity of the location where the inner cylinder 12 of the bumper 2 is connected. Thereby, when the expansion-contraction support part 10 is shortened to the shortest state, it can avoid that the bumper 2 and the arm part 121 contact.

  Here, when another vehicle or the like collides with the bumper 2, the design strength of the arm portion 121 may be set so that the arm portion 121 is deformed before other constituent members and absorbs the collision energy. . Thereby, at the time of a collision etc., the impact force transmitted to the motor 30 for rotation, the worm speed reducer 32, etc. can be reduced, and damage to the motor 30 for rotation etc. can be suppressed.

  In the above description, an example in which the bumper 2 of the movable bumper device 1 and the movable bumper device 101 is a rush prevention device provided at the rear portion of the vehicle 50 has been described. 55 may be provided on a side portion of the vehicle 50 as an entanglement preventing device for preventing the entanglement of the vehicle 50. In that case, the expansion / contraction support portion 10 that supports the bumper 2 is provided so as to expand and contract in the vehicle width direction which is the inside / outside direction of the vehicle 50.

  In each of the above-described embodiments, an example in which a DC servo motor or the like that can detect the rotation position is used as the expansion / contraction motor 15 and the rotation motor 30, or the expansion / contraction sensor 41 and the rotation sensor 42, Although the example which detects an expansion-contraction state and a rotation state was demonstrated, the method to detect the state of the bumper 2 is not limited to these. For example, other sensors for detecting the position of the bumper 2 and the like may be provided. The driving of the telescopic motor 15 and the rotation motor 30 may be controlled based on the position information of the bumper 2 detected by various sensors.

  Moreover, based on the information detected by the sensor or the like, for example, a display unit, an alarm unit, or the like that notifies the driver or the like of the state of the movable bumper devices 1 and 101 may be provided. Accordingly, for example, when the vehicle 50 is started in a state where the position of the bumper 2 is not set to an appropriate position at the time of traveling, the driver can be notified that the bumper 2 is not appropriate.

  Further, for example, as a sensor or the like for detecting the position or the like of the bumper 2, an imaging device such as a camera, a video analysis device, or the like may be provided. In that case, the camera or the like may also have a function for assisting the driver's driving by photographing the rear of the vehicle 50 when traveling backward.

  In addition, this invention is not limited to the said embodiment, In addition, a various change implementation is possible in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1,101 Movable bumper apparatus 2 Bumper 10 Telescopic support part 11 Outer cylinder 12 Inner cylinder 15 Telescopic motor 16 Ball screw shaft 17 Ball screw nut 20 Support shaft 21, 121 Arm part 22 Bearing 23 Sprocket 30 Rotating motor 31 Drive shaft 32 Worm reducer 33 Sprocket 34 Chain 50 Vehicle 51 Frame 60 Asphalt finisher

Claims (3)

A bumper provided in the vehicle;
An expansion / contraction support portion provided to be extendable in the vehicle's inner and outer directions and supporting the bumper;
Telescopic drive means for expanding and contracting the expansion support part
A rotation support portion that rotatably supports the telescopic support portion with respect to the frame of the vehicle;
Rotation driving means for driving the rotation support part to rotate the expansion / contraction support part,
The bumper moves inward of the vehicle from a predetermined position during traveling by shortening the expansion / contraction support portion by the expansion / contraction drive means, and the expansion / contraction support portion is rotated by the rotation drive means. The movable bumper device, wherein the movable bumper device is further moved inward and upward of the vehicle and stored. The expansion / contraction support part includes an outer cylinder supported by the rotation support part, and an inner cylinder that is slidably provided inside the outer cylinder and has the bumper attached to one end thereof.
The telescopic drive means includes a telescopic motor attached to the outer cylinder, a feed screw shaft driven by the telescopic motor, and a feed screw connected to the inner cylinder and screwed to the feed screw shaft. The movable bumper device according to claim 1, further comprising a nut. The rotation support portion includes a support shaft that is rotatably provided with respect to the frame, and an arm portion that connects the support shaft and the extendable support portion,
The rotation drive means includes a rotation motor that rotates the support shaft, and a power transmission mechanism that transmits rotational power from the rotation motor to the support shaft. 2. The movable bumper device according to 2.

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