VEHICLE SHAFT LOCKING DEVICE AND VEHICLE EQUIPPING THE SAME

Abstract

A vehicle axle locking device for lifting and holding an axle (2) of a vehicle, comprising the following features: a wire (10) with a pointed end (10a) connected to the axle side; a first support (30) and a second support (40) arranged higher than the pointed end (10a) of the wire (10) and supporting the wire (10); a spring (20) to which a rear end (10b) of the wire (10) bridging between the first support (30) and the second support (40) is connected;and a distance-changing tool (50) that changes the distance between the first support (30) and the second support (40), wherein the rear end (10b) of the wire (10), which runs from the tip end (10a) over the first support (30) and the second support (40), is connected to the spring (20), at a time of shaft locking the wire (10) is pulled to the rear end to raise the axle (2) by increasing the distance between the first support (30) and the second support (40) by the distance-changing tool (50), and the distance between the first support (30) and the second support (40) is constant while the vehicle is moving, and if a distance between the first support (30) and the tip end (10a) of the wire (10) changes due to a change in chassis height, the spring (20) extends and contracts to position the rear end (10b) of the wire (10) to compensate for any sag in the wire.;

Description

Technical area

[0001] The present invention relates to a shaft locking device that lifts an axle of a vehicle. Background technology

[0002] Fig. 5 is a schematic view showing a ladder-equipped vehicle during work from the rear. In the ladder-equipped vehicle, an operation of extending, rotating, and raising / lowering a ladder 9 is performed in a state where a boom 8 is extended and jacked up, but when, for example, the ladder 9 is rotated, there is a possibility that the balance in the left-right direction is lost and the vehicle tilts by about 2 degrees. When the vehicle tilts, the boom 8 lifts up from the ground on one side. A load on a rear wheel 1 on the lifted side decreases and such a rear wheel 1 expands, and for this reason, force is continuously applied in a direction of tipping the vehicle. Thus, in a work vehicle such as a truck,a vehicle equipped with a ladder or a vehicle equipped with a swing arm, a shaft locking device is attached to prevent deterioration of stability due to a reaction force of a tire or suspension in a working position.

[0003] For example, Patent Literature 1 discloses a multi-purpose vehicle including a rotating ladder or a lifting rescue platform and a lifting system, the lifting system including a side floor support for jacking up a vehicle body and a stabilizing unit for blocking an inclination of the vehicle body in a jacked-up state, the stabilizing unit including a hydraulically operable rear axle locking device for locking a rear axle suspension of the vehicle and a hydraulically lockable shock absorber integrated with a front axle suspension of the vehicle, and the rear axle locking device and the hydraulically lockable shock absorber are controlled by activation of the rear axle locking device and a general hydraulic control unit for locking the hydraulically lockable shock absorber after activation.

[0004] Although it is not intended to prevent deterioration of stability in the working position, Patent Literature 2 discloses an automobile suspension device including an axle of a ground wheel fixed to a pair of control arms adjacently mounted on both side portions of a vehicle frame to swing in the vertical direction, and an air spring mounted to transmit a load between the control arms and the frame. The automobile suspension device has an improved structure in which the axle and the wheel fixed thereto are lifted according to the adjustment of the internal pressure of the air spring, and includes a lever device provided on the frame through a support shaft device to swing from one position to the other position. The lever device and the support shaft device are provided separately from the control arms and a fixing device for the same.The automobile suspension device includes a spring device attached to the frame for generating a force of swinging the lever device to one position, and a link device that generates a force for lifting an axle in response to the lever device swinging from the other position to the one position. The lever device, the spring device, and the link device are arranged in such a relationship that, when attached to the frame, the spring force and the lifting force act along a line on which a distance from the support shaft device changes according to the swinging motion of the lever device. When the lever device swings from the other position to the one position, the distance on the line of action of the spring force increases and the distance on the line of action of the lifting force decreases. Reference listPatent literature Patent Literature 1: JP-A-2015-157620 Patent Literature 2: JP-B-52-11968 Brief description of the inventionProblems to be solved by the invention

[0005] As a suspension system for a work vehicle chassis, a leaf spring system that absorbs shocks by flexing overlapping leaf springs has been widely used, but an air spring system that absorbs shocks by adjusting air pressure in a rubber valve is becoming increasingly common. Since a vehicle equipped with an air spring system assumes a working position in a state where air is removed from the valve and a suspension function is weakened, the vehicle equipped with the air spring system is more stable than one equipped with a leaf spring system, but to enhance safety, it is preferable to have a shaft locking device attached to it.

[0006] However, in the case of a work vehicle equipped with a leaf spring suspension, the amount of change in vehicle height due to the flexion of a leaf spring during movement is relatively small, whereas in the case of a vehicle equipped with an air suspension, the amount of change in vehicle height is relatively large, such as in a case where the vehicle height can be changed by changing the air pressure of a valve during movement. Thus, it is difficult to apply a suspension lock device used in a vehicle equipped with a leaf spring suspension to a vehicle equipped with an air suspension, even if the configuration of the same is slightly changed.

[0007] Here, the multi-purpose vehicle described in Patent Literature 1 includes the stabilizing unit that blocks the tilting of the vehicle body in the jacked-up state, but there is no description of the vehicle following the change of the vehicle height during moving.

[0008] Furthermore, the air suspension device described in Patent Literature 2 does not improve vehicle stability by raising the axle in the working position. It should be noted that this literature describes that when the vehicle is operating in an unloaded or light-load state, the internal pressure of the air spring is released, the axle is raised by the coil spring and the linkage, and the wheel is separated from the road surface. However, there is no description of the vehicle following the change in vehicle height in a state where the wheel is grounded.

[0009] Therefore, an object of the present invention is to provide a vehicle shaft locking device that can be applied to a vehicle equipped with an air suspension and a vehicle comprising the shaft locking device. Solving the problems

[0010] A vehicle shaft locking device according to a first aspect of the present invention is a shaft locking device for lifting and holding an axle 2 of a vehicle, the shaft locking device comprising a wire 10 having a tip end 10a connected to the side of the axle 2, a first support 30 and a second support 40 arranged higher than the tip end 10a of the wire 10 and supporting the wire 10, a spring 20 to which a rear end 10b of the wire 10 bridging between the first support 30 and the second support 40 is connected, and a distance changing tool 50 that changes a distance between the first support 30 and the second support, the rear end 10b of the wire 10 being connected from the tip end 10a via the first support 30 and the second support 40 to the spring 20 at a time of shaft locking the wire 10 to the side of the rear end 10b is pulled,to raise the axle 2 by increasing the distance between the first support and the second support 40 by the distance changing tool, and the distance between the first support 30 and the second support 40 is constant while the vehicle is moving, and when a distance between the first support 30 and the tip end 10a of the wire 10 changes due to a change in a chassis height, the spring 20 expands and contracts to change the position of the rear end 10b of the wire 10 to compensate for a slack in the wire 10.,

[0011] A second aspect of the present invention is the vehicle shaft locking device according to the first aspect, in which the position of the first carrier 30 is fixed and the position of the second carrier 40 is variable, and the distance changing tool 50 moves the second carrier 40 to change the distance between the first carrier 30 and the second carrier 40.

[0012] A third aspect of the present invention is the vehicle shaft locking device according to the second aspect, in which the first bracket 30 is arranged vertically above the tip end 10a of the wire 10, the second bracket 40 is arranged at the same height as that of the first bracket 30, the pitch changing tool 50 is a cylinder connected to the second bracket 40 and arranged between the first bracket 30 and the second bracket 40 with an extension-contraction direction as a vehicle front-backward direction, and the spring 20 is arranged lower than the pitch changing tool 50 with an extension-contraction direction as the vehicle front-backward direction.

[0013] A fourth aspect of the present invention is the vehicle shaft locking device according to any one of the first to third aspects, in which the spring 20, the first bracket 30, the second bracket 40, and the distance changing tool 50 are attached to the frame 7 provided above a chassis 5 of the vehicle.

[0014] A fifth aspect of the present invention is the vehicle shaft locking device according to any one of the first to fourth aspects, further comprising a regulator 60 that regulates an extension of the spring 20 between the second support 40 and the spring 20, wherein the rear end 10b of the wire 10 is arranged between the regulator 60 and the spring 20, and when the wire 10 is pulled to the tip end 10a side and the spring 20 extends, the rear end 10b of the wire 10 abuts the regulator 60 and no longer moves further to the second support 40 side to stop the extension of the spring 20.

[0015] A sixth aspect of the present invention is the vehicle shaft locking device according to any one of the first to fifth aspects, further comprising a break detector 70 that detects a break of the wire 10, wherein the break detector 70 detects the break based on whether or not the rear end 10b of the wire 10 is at a predetermined position when the distance between the first bracket 30 and the second bracket 40 increases at the time of shaft locking.

[0016] A seventh aspect of the present invention is the vehicle shaft locking device according to any one of the first to sixth aspects, wherein the first carrier 30 and the second carrier 40 are rollers.

[0017] An eighth aspect of the present invention is the vehicle shaft locking device according to any one of the first to seventh aspects, further comprising a connecting member 80 attached to the rear end 10b of the wire 10 on one side and attached to the spring 20 on the other side, and a rail 90 to which the connecting member 80 is attached, the connecting member 80 moving along the rail 90 along with the movement of the wire or the spring 20.

[0018] A vehicle according to a ninth aspect of the present invention is a vehicle including the vehicle shaft locking device according to any one of the first to eighth aspects. Effects of the invention

[0019] According to the present invention, the vehicle shaft locking device that can be applied to the vehicle equipped with the air suspension and the vehicle including the shaft locking device can be provided. Short description of the drawings Fig. 1 is a view illustrating a vehicle shaft locking device according to an embodiment of the present invention. Fig. 2 is a view illustrating an operation of the shaft locking device when the shaft locking is performed. Fig. 3 is a view illustrating the operation of the shaft locking device when a chassis height is maximized during movement. Fig. 4 is a view illustrating the operation of the shaft locking device when the chassis height is minimized during movement. Fig. Figure 5 is a schematic view showing a ladder-equipped vehicle during work from the rear. Description of implementation examples

[0020] A vehicle shaft locking device according to a first embodiment of the present invention is a shaft locking device for lifting and holding an axle of a vehicle, the shaft locking device comprising a wire having a tip end connected to the axle side, a first support and a second support that are arranged higher than the tip end of the wire and support the wire, a spring to which a rear end of the wire that bridges between the first support and the second support is connected, and a distance changing tool that changes a distance between the first support and the second support, the rear end of the wire being connected to the spring from the tip end via the first support and the second support at the time of shaft locking so that the wire is pulled to the rear end side.To raise the axle by increasing the distance between the first support and the second support by the distance changing tool, and the distance between the first support and the second support is constant while the vehicle is moving, and when a distance between the first support and the tip end of the wire changes due to a change in a chassis height, the spring expands and contracts to change the position of the rear end of the wire to compensate for a slack in the wire.

[0021] According to the present embodiment, the shaft locking can be reliably performed and the slack of the wire during moving can be effectively prevented even in a vehicle equipped with an air suspension having a large range of change in the chassis height.

[0022] A second embodiment of the present invention is the vehicle shaft locking device according to the first embodiment, in which the position of the first carrier is fixed and the position of the second carrier is variable, and the distance changing tool moves the second carrier to change the distance between the first carrier and the second carrier.

[0023] According to the present embodiment, the axis can be pulled up smoothly because the position of the first support serving as a supporting point of a vertically extending portion of the wire is fixed.

[0024] A third embodiment of the present invention is the vehicle shaft locking device according to the second embodiment, in which the first bracket is arranged vertically above the tip end of the wire, the second bracket is arranged at the same height as that of the first bracket, the pitch changing tool is a cylinder connected to the second bracket and arranged between the first bracket and the second bracket with an extension-contraction direction as a vehicle front-back direction, and the spring is arranged lower than the pitch changing tool with an extension-contraction direction as the vehicle front-back direction.

[0025] According to the present embodiment, the shaft locking device can be assembled compactly and a required mounting space can be relatively small.

[0026] A fourth embodiment of the present invention is the vehicle shaft locking device according to any one of the first to third embodiments, in which the spring, the first bracket, the second bracket, and the distance changing tool are mounted on a frame provided above a chassis of the vehicle.

[0027] According to the present embodiment, the shaft locking device can be mounted using the frame.

[0028] A fifth embodiment of the present invention is the vehicle shaft locking device according to any one of the first to fourth embodiments, further comprising a regulator that regulates an extension of the spring between the second bracket and the spring, wherein the rear end of the wire is arranged between the regulator and the spring, and when the wire is pulled to the tip end side and the spring expands, the rear end of the wire abuts the regulator and no longer moves toward the second bracket side to stop the extension of the spring.

[0029] According to the present embodiment, since the extension of the spring is limited by the regulator, the axle is easily lifted at the time of shaft locking.

[0030] A sixth embodiment of the present invention is the vehicle shaft locking device according to any one of the first to fifth embodiments, further comprising a break detector that detects a break of the wire, wherein the break detector detects the break based on whether or not the rear end of the wire is at a predetermined position when the distance between the first bracket and the second bracket increases at the time of shaft locking.

[0031] According to the present embodiment, the interruption can be easily and reliably detected.

[0032] A seventh embodiment of the present invention is the vehicle shaft locking device according to any one of the first to sixth embodiments, in which the first carrier and the second carrier are rollers.

[0033] According to the present embodiment, the movement of the wire can be smooth and the interruption of the wire can be reduced.

[0034] An eighth embodiment of the present invention is the vehicle shaft locking device according to any one of the first to seventh embodiments, further comprising a connecting member attached to the rear end of the wire on one side and attached to the spring on the other side, and a rail to which the connecting member is attached, wherein the connecting member moves along the rail along with the movement of the wire or the spring.

[0035] According to the present embodiment, the movement of the wire and the spring can be made smooth.

[0036] A vehicle according to a ninth embodiment of the present invention includes the vehicle shaft locking device according to any one of the first to eighth embodiments.

[0037] According to the present embodiment, the shaft locking can be reliably performed and the slack of the wire during movement can be effectively prevented even in a vehicle having a large range of change in chassis height, such as a vehicle equipped with an air suspension. EXAMPLES

[0038] Hereinafter, a vehicle shaft locking device according to an embodiment of the present invention will be described.

[0039] Fig. 1 is a view illustrating the vehicle shaft locking device according to the present embodiment. Although Fig. 1 shows the shaft locking device mounted on the side of the left rear wheel, it should be noted that a shaft locking device is also mounted on the side of the right rear wheel. In addition, Fig. 1 illustrates both a case where an axle, a rear wheel, and the like are positioned on the upper side and a case where the axle, the rear wheel, and the like are positioned on the lower side.

[0040] An axle (rear shaft) 2 of a rear wheel 1 is supported by an arm 4, one end of which is connected to a lower portion of a bracket 3. An upper portion of the bracket 3 is attached to the chassis 5 in front of the axle 2, and the lower portion of the bracket 3 projects downward beyond the lower surface of the chassis 5. An air valve 6, which acts as an air suspension, is attached to the other end of the arm 4. A frame 7 is mounted above the chassis 5.

[0041] The vehicle axle locking device includes a wire 10 that lifts the axle 2, a spring 20 that horizontally expands and contracts with one end 20a fixed to the frame 7, a first support 30 and a second support 40 that support the wire 10 at a position higher than a tip end 10a of the wire 10, a hydraulic cylinder 50 as a distance changing tool that changes a distance between the first support 30 and the second support 40, a regulator 60 that controls an extension of the spring 20, a breakage detector 70 that detects a breakage of the wire 10, a connecting member 80 that connects the wire 10 and the spring 20 to each other, and a rail 90 to which the connecting member 80 is attached.

[0042] The tip end 10a of the wire 10 is connected to the arm 4, which is a support member for the axle 2, via an attachment piece 100, and a rear end 10b is connected to the other end 20b of the spring 20 via the connecting member 80. The attachment piece 100 is fixed to the arm 4 with a pin 110 and is rotatable at a portion connected to the wire 10. Furthermore, the attachment piece 100 is fixed to the arm 4 together with the axle (rear shaft) 2.

[0043] The hydraulic cylinder 50 is mounted between the first beam 30 and the second beam 40 on the frame 7, with an extension-contraction direction as the horizontal direction.

[0044] The first support 30 is a roller whose position is fixed and is attached to the frame 7 at a position vertically above the tip end 10a of the wire 10.

[0045] The second beam 40 is a movable roller that can change its horizontal position and is fixed to the frame 7 at a position in front of the first beam 30. The first beam 30 and the second beam 40 have the same mounting height (vertical position). A movable portion of the hydraulic cylinder 50 is connected to the second beam 40, and the second beam 40 reciprocates in a vehicle forward-backward direction by the extension and contraction of the hydraulic cylinder 50.

[0046] By using the rollers as the first carrier 30 and the second carrier 40 as in the present embodiment, movement of the sliding wire 10 can be made smooth and interruption can be reduced.

[0047] One end 20a of the spring 20 is attached to the frame 7 at a position immediately below the second bracket 40, and the other end 20b is fixed to the connecting member 80. The rear end 10b of the wire 10 is fixed to the connecting member 80 from the direction opposite to the spring 20. That is, the wire 10 is attached to the connecting member 80 from one side, and the spring 20 is attached to the connecting member 80 from the other side.

[0048] The wire 10 has, between the tip end 10a and the first bracket 30, a pull-up portion 10c which is a portion extending substantially vertically in a vehicle up-down direction, an extended portion 10d which is a portion extending substantially horizontally in the vehicle front-back direction between the first bracket 30 and the second bracket 40 after changing its direction by 90 degrees at the first bracket 30, and a folded portion 10e which is a portion extending substantially horizontally in the vehicle front-back direction between the second bracket 40 and the spring 20 after being folded by 180 degrees at the second bracket 40.

[0049] In Fig. 1, α represents the movable range of the hydraulic cylinder 50, β represents the movable range of the spring 20, and γ represents the distance from the pin 110 to the upper surface of the chassis 5.

[0050] A total length obtained by adding the length of the spring 20 to the length of the wire 10 varies depending on the degree of extension and contraction of the spring 20, but the “distance from pin 110 to the upper surface of the chassis 5 - length of the spring 20 + cylinder stroke of the hydraulic cylinder 50 x 2” is constant between the time of shaft locking and the time of movement.

[0051] As in the present embodiment, the spring 20, the first bracket 30, the second bracket 40, and the hydraulic cylinder 50 are mounted on the frame 7 provided above the chassis 5 of the vehicle, the first bracket 30 is arranged vertically above the tip end of the wire 10, the second bracket 40 is arranged at the same height as that of the first bracket 30, the hydraulic cylinder 50 is arranged between the first bracket 30 and the second bracket 40 with the extension-contraction direction as the vehicle front-backward direction, and the spring 20 is arranged lower than the hydraulic cylinder 50 with the extension-contraction direction as the vehicle front-backward direction, whereby the shaft locking device can be compactly assembled and mounted using the frame 7, and a required mounting space can be relatively small.

[0052] The regulator 60 is arranged between the second support 40 and the spring 20, and the rear end 10b of the wire 10 is arranged closer to the side of the spring 20 than the regulator 60.

[0053] When the wire 10 is pulled toward the tip end 10a side, the spring 20 expands, and the rear end 10b of the wire 10 approaches the second support 40. However, the rear end 10b of the wire 10 cannot move beyond the regulator 60, and therefore, when the rear end 10b of the wire 10 abuts the regulator 60, the expansion of the spring 20 stops.

[0054] The rail 90 is provided at a position corresponding to the movement range of the rear end 10b of the wire 10. The connecting member 80, which is slidably engaged with the rail 90, moves along the rail 90 along with the movement of the wire 10 or the spring 20. With this configuration, the movement of the wire 10 and the spring 20 at the folded portion 10e can be made smooth.

[0055] Fig. 2 is a view illustrating an operation of the shaft locking device when the shaft locking is performed.

[0056] When shaft locking is performed, the chassis height is set to the minimum height, and the air valve 6 is in a non-extended state where air is removed from it. Shaft locking is performed, for example, simultaneously with the boom extension or jacking up.

[0057] At the time of shaft locking, the second support 40 is moved forward in parallel by the forward extension of the hydraulic cylinder 50. As a result, in the wire 10, the extended portion 10d and the folded portion 10e are moved forward as the second support 40 moves away from the first support, and accordingly, the pull-up portion 10c is pulled upward. Thus, the arm 4 to which the tip end 10a of the wire 10 is connected is pulled upward, and the axle 2 moves upward and is held at a predetermined height. At this time, since the extension of the spring 20 stops when the rear end 10b of the wire 10 abuts the regulator 60 provided at the position immediately in front of the second support 40, as described above, it is easy to lift the axle 2 by restricting the movement of the rear end 10b of the wire 10 more than necessary.It should be noted that to reliably prevent the vehicle from tipping over during work, it is preferable to raise the axle 2 until the rear wheel 1 is off the ground. When the shaft is locked, the wire tension is relatively strong.

[0058] In this way, at the time of shaft locking, by increasing the distance between the first carrier 30 and the second carrier 40, the axle 2 can be lifted by pulling the wire 10 toward the rear end 10b side. Furthermore, by moving the second carrier 40 with the wire 10 on both sides facing the direction opposite to the moving direction at the time of shaft locking, the pulling distance of the wire 10 by the second carrier 40 can be increased to twice the cylinder stroke, such as in a case where the wire 10 can be pulled by 260 mm when the cylinder stroke is 130 mm. Thus, the distance between the first carrier 30 and the second carrier 40 can be made relatively short, and the shaft locking device can be arranged compactly.

[0059] In addition, the axis 2 can be pulled up smoothly because the position of the first support 30 serving as the support point of the pulling-up portion 10c of the wire 10 is fixed.

[0060] It should be noted that at the time of shaft release, the second support 40 is moved backward in parallel to contract the hydraulic cylinder 50. As a result, the tip end 10a of the wire 10 is lowered, allowing the axle 2 to return to its original position.

[0061] The controller 60 is provided with a proximity sensor that detects that the rear end 10b (connecting member 80) of the wire 10 approaches the controller 60.

[0062] When the distance between the first carrier 30 and the second carrier 40 increases at the time of shaft locking, the disconnection detector 70 detects a disconnection depending on whether the proximity sensor responds or not, that is, whether the rear end 10b of the wire 10 is closer to the controller 60. As described above, at the time of shaft locking, the folded portion 10e of the wire 10 is pulled forward along with the forward movement of the second carrier 40, and accordingly, the rear end 10b approaches the second carrier 40. However, when the wire 10 is disconnected, the rear end 10b does not approach the second carrier 40 even if the second carrier 40 moves forward. Therefore, if the proximity sensor does not respond at the time of shaft locking, it can be determined that the wire 10 is disconnected.As described above, according to the open circuit detection of the present embodiment, a break in the wire 10 can be easily and reliably detected.

[0063] Fig. 3 and Fig. 4 are views illustrating the state of the shaft locking device during movement. The hydraulic cylinder 50 is fixed so as not to expand and contract during movement.

[0064] Fig. 3 represents a condition where the chassis height is maximized by expanding the air valve with air.

[0065] When the air valve 6 expands and extends downward, the tip end side of the arm 4 is pushed downward, and accordingly, a force in a direction of pulling down the tip end 10a strongly acts on the wire 10. Note that since the attachment piece 100 is rotatable at the portion connected to the wire, the pull-up portion 10c of the wire 10 can be kept substantially vertical even when the arm 4 is directed downward.

[0066] When the arm 4 is lowered, the pull-up portion 10c of the wire 10 is pulled downward, and correspondingly, the expanded portion 10d is pulled rearward and the folded portion 10e is pulled forward. Since the rear end 10b of the wire 10 is connected to the spring 20 and its horizontal portion is variable, the spring 20 expands and the rear end 10b of the wire 10 moves forward when the folded portion 10e is pulled forward. Then, the tip end 10a is lowered by an amount corresponding to a forward movement of the rear end 10b. With this configuration, when a vehicle height is raised, the wire 10 can smoothly follow the change in the vehicle height.

[0067] In a condition where the chassis height is maximized, the wire tension is relatively low.

[0068] Fig.4 illustrates a state where the chassis height is minimized by removing air from the air valve.

[0069] When the air valve 6 contracts, the arm 4 rotates, so that the tip end side thereof rises. At this time, compared to a state where the chassis height is maximized, a force of the wire 10 pulling the spring 20 is weakened, with a reduction in a force of the arm 4 pulling the tip end 10a of the wire 10 downward. Thus, the spring 20 contracts, and the rear end 10b of the wire 10 moves rearward. As a result, the remaining slack portion of the wire 10 after the arm 4 is raised is absorbed by the spring 20, and therefore the slack in the wire 10 can be compensated.

[0070] As described above, the wire 10 can be kept in an appropriate state in association with the change in the vehicle height, such as a case where the spring 20 contracts to automatically prevent the slack of the wire 10 when the vehicle height is lowered.

[0071] In a state where the chassis height is minimized, the wire tension is relatively low.

[0072] In the present embodiment, the control is performed so that no air can be introduced into the air valve 6 during the shaft locking and air can be introduced into the air valve 6 after the shaft unlocking.

[0073] As described above, the vehicle shaft locking device of the present invention can reliably perform the shaft locking and can effectively prevent the slack of the wire 10 during moving, not only in a vehicle equipped with a leaf spring suspension but also in a vehicle equipped with an air spring suspension having a large range of change in a chassis height (vehicle height). LIST OF REFERENCE SYMBOLS 2 axle 5 Chassis 6 Air valve 7 frames 10 wire 10a top end 10b rear end 20 springs 30 first carrier 40 second carrier 50 Distance adjustment tool (hydraulic cylinder) 60 controllers 70 Interruption detector 80 connecting member 90 rail QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP-A-2015-157620

[0004] JP-B-52-11968

[0004]

Claims

[1] A shaft locking device for lifting and holding an axle of a vehicle, having the following features: a wire having a tip end connected to the axle side; a first support and a second support arranged higher than the tip end of the wire and supporting the wire; a spring to which a rear end of the wire bridging between the first support and the second support is connected; and a distance changing tool that changes a distance between the first carrier and the second carrier, wherein the rear end of the wire is connected to the spring from the tip end via the first support and the second support, at a time of shaft locking, the wire is pulled to the rear end side to lift the axle by increasing the distance between the first carrier and the second carrier by the distance changing tool and the distance between the first support and the second support is constant while the vehicle is moving, and when a distance between the first support and the tip end of the wire changes due to a change in a chassis height, the spring expands and contracts to change a position of the rear end of the wire to accommodate a slack in the wire. [2] The vehicle shaft locking device according to claim 1, wherein a position of the first carrier is fixed and a position of the second carrier is variable and the Distance Modification tool moves the second beam to change the distance between the first beam and the second beam. [3] The vehicle shaft locking device according to claim 2, wherein the first support is arranged vertically above the tip end of the wire, the second support is arranged at the same height as that of the first support, the distance changing tool is a cylinder connected to the second carrier and arranged between the first carrier and the second carrier, with an extension-contraction direction as a vehicle forward-backward direction and the spring is arranged lower than the distance changing tool, with an extension-contraction direction other than the vehicle forward-backward direction. [4] The vehicle shaft locking device according to any one of claims 1 to 3, wherein the spring, the first carrier, the second carrier and the distance changing tool are mounted on a frame provided above a chassis of the vehicle. [5] The vehicle shaft locking device according to any one of claims 1 to 4, further comprising: a regulator that regulates an extension of the spring between the second carrier and the spring, wherein the rear end of the wire is arranged between the regulator and the spring and when the wire is pulled to the side of the tip end and the spring expands accordingly, the rear end of the wire hits the regulator and no longer moves to the second support side to stop the extension of the spring. [6] The vehicle shaft locking device according to any one of claims 1 to 5, further comprising: a break detector that detects a break in the wire, wherein the break detector detects the break based on whether or not the rear end of the wire is at a predetermined position when the distance between the first carrier and the second carrier increases at the time of shaft locking. [7] The vehicle shaft locking device according to any one of claims 1 to 6, wherein the first carrier and the second carrier are rollers. [8] The vehicle shaft locking device according to any one of claims 1 to 7, further comprising: a connecting member attached on one side to the rear end of the wire and attached on the other side to the spring; and a rail to which the connecting member is attached, wherein the connecting member moves along the rail in conjunction with movement of the wire or spring. [9] A vehicle comprising: the vehicle shaft locking device according to any one of claims 1 to 8.

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