JPH0495554A - Auxiliary wheel device for vehicle - Google Patents

Abstract

PURPOSE:To keep off any abrasion due to friction between an auxiliary wheel and a road surface as well as to make a light uplift performable by making the auxiliary wheel free of rotation at time of uplifting a car body, in a device which laterally moves a front part or rear part or rear part of the car body by means of rotation of the auxiliary wheel after it is lowered and the car body is uplifted. CONSTITUTION:In a device which supports an auxiliary wheel 11 on the rear of a car body rotatably around an axis in the longitudinal direction of the car body via a support arm 12 being free of rocking motion and simultaneously uplifts the car body BD by rocking this support arm 12 through a hydraulic cylinder 13 whose axis is directed aslant to a road surface, an oil passage P2 is branched off from an oil passage P1 leading to the hydraulic cylinder 13 provided with a solenoid selector valve 25, and this oil passage P2 is connected to a hydraulic motor 15 via another solenoid selector valve 28. When these valves 25, 28, etc., are controlled by a micro- processing unit 41, the auxiliary wheel 11 is rotated and driven by the hydraulic motor 15 at a time when a rotation indicating switch 43, indicating the rotation or stoppage of the auxiliary wheel 11, indicates the rotation of the wheel 11, and when indicating the stoppage of the wheel 11, the auxiliary wheel 11 is maintained rotatably by dint of external force.

Description

[Detailed description of the invention] [Industrial application field]

The present invention lowers the auxiliary wheels by means of a jack provided at the front or rear of the vehicle body to lift the vehicle body, and then rotates the auxiliary wheels around an axis in the longitudinal direction of the vehicle body using a rotary actuator. The present invention relates to an auxiliary wheel device for a vehicle that enables parallel parking in narrow spaces by moving the front or rear part laterally.

[Prior art]

The first prior art of this type of device is, for example, as shown in Japanese Utility Model Application Publication No. 48-75339. It consists of a linear actuator that is assembled to the vehicle body in a vertical direction, and by extending the linear actuator with the rotation of the auxiliary wheels prohibited,
There is one in which the training wheels are lowered perpendicular to the road surface to lift the vehicle body. In addition, as a second conventional technique, for example,
As shown in Publication No. 3852, the above-mentioned shirt cow for lifting the vehicle body is supported by a support arm that is swingably supported by the upper end of the trowel vehicle body and has an auxiliary wheel attached to the lower end of the trowel, and a support arm that is attached to the upper end of the trowel. and a linear actuator that is swingably supported by a part of the vehicle body at a side position of the support arm and extends diagonally downward, and is rotatably assembled at the lower end at an intermediate position of the support arm, Instead of extending the linear actuator with the rotation of the auxiliary wheels prohibited, some systems have been written in which the supporting arms are swung until they are approximately upright, and the vehicle body is lifted by the circular motion of the auxiliary wheels.

[Problem to be solved by the invention]

However, in the first conventional technology, the linear actuator lowers the auxiliary wheels stored on the underside of the vehicle body in a direction perpendicular to the road surface to lift the vehicle body, so the axis of the actuator is set perpendicular to the road surface. In addition, since the actuator has a large stroke, it is difficult to assemble the actuator to the vehicle body. In addition, in the second prior art, the axis of the linear actuator is diagonal to the road surface, so there is no assembly problem as described above. When the support arm is swung and the training wheel is moved in an arc due to the extension of There was a problem that the vehicle body would shake sideways. The present invention was made to solve the above problem, and its purpose is to provide an auxiliary wheel device in which the axis of the linear actuator is set diagonally with respect to the road surface.
To provide a auxiliary wheel device for a vehicle that prevents auxiliary wheels from being worn out, excessive force from acting on support arms, and the vehicle body from significantly swaying sideways even when lifting the vehicle body.

[Means to solve the problem]

In order to achieve the above object, the structural features of the present invention are as follows:
a support arm whose upper end is supported so as to be swingable around an axis in the longitudinal direction of the vehicle body at the front or rear portion of the vehicle body, and whose lower end portion supports an auxiliary wheel so as to be rotatable around an axis in the longitudinal direction of the vehicle body;
A part of the vehicle body located on the side of the support arm at the upper end is supported so as to be swingable about an axis in the longitudinal direction of the vehicle body and extends diagonally downward, and at the lower end is located at the middle of the support arm. A auxiliary wheel device for a vehicle, comprising: a linear actuator that is attached to a position so as to be rotatable about an axis in the longitudinal direction of the vehicle body, and expands and contracts to swing the support arm about the axis in the longitudinal direction of the vehicle body with the upper end portion as a fulcrum; , a rotation instruction switch for instructing rotation and stop of the auxiliary wheel; and a rotation instruction switch for rotationally driving the auxiliary wheel when the rotation instruction switch is instructing rotation of the auxiliary wheel; A rotary actuator is provided to maintain the auxiliary wheel rotatable by an external force when an instruction is given.

[Effect]

In the present invention configured as described above, the rotary actuator rotates the auxiliary wheel when the rotation instruction switch instructs the rotation of the auxiliary wheel, and rotates the auxiliary wheel when the rotation instruction switch instructs the rotation of the auxiliary wheel. The actuator maintains the auxiliary wheels rotatable by external force, so when the rotation of the rotary actuator is controlled to stop and the linear actuator swings the support arms to lift the vehicle body, the auxiliary wheels are rotated by the external force from the road surface. The support arm is rotated, and the support arm is swung to a substantially upright position with the rotation of the auxiliary wheels, and the vehicle body is lifted.

【Effect of the invention】

As explained above, the auxiliary wheels rotate when lifting the car body, so the auxiliary wheels may wear out due to friction with the road surface.
This prevents excessive force from being applied to the support arms or causing the vehicle body to swing sideways.

【Example】

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIGS. 2 and 3 are schematic diagrams of a vehicle according to the embodiment viewed from the side and rear. In addition to left and right front wheels FWI, FW2 and left and right rear wheels RWI, RW2, this vehicle has an auxiliary wheel 1 as a fifth wheel.
1, and the auxiliary wheels 11 are assembled to be movable up and down with respect to the vehicle body BD by a hydraulic jack mechanism 10. The hydraulic jack mechanism 10 includes a support arm 12 and a hydraulic cylinder 13 as a linear actuator. The auxiliary wheel 11 is supported rotatably around the axis in the longitudinal direction of the vehicle at its lower end and on the side surface. The hydraulic cylinder 13 has a cylinder tube 13a inclined in the lateral direction of the vehicle, and one end of the cylinder tube 13a is on the side of the support arm 12 and can swing around the axis in the longitudinal direction of the vehicle on the lower surface of the vehicle body BD. The piston rod 13b protrudes from the other end. One end of the piston rod 13b is attached to the support arm 12 at an intermediate position so as to be rotatable around an axis in the longitudinal direction of the vehicle, and the other end is attached to a cylinder tube 1 as shown in FIG.
A piston 13c that partitions 3a into upper and lower chambers is fixed. A spring 14 is provided in the lower chamber of the cylinder tube 13a.
is stored, and the spring 14 is always connected to the piston 13.
c and the piston rod 13b upward. The support arm 12 has a hydraulic motor 15 as a rotary actuator fixed on the side opposite to the auxiliary wheel 11, and the motor 15 has its rotating shaft connected to the center axis of the auxiliary wheel 11, as shown in FIG. As shown, the auxiliary wheels 11 are driven in forward rotation and reverse rotation depending on the direction in which hydraulic oil is supplied and discharged. Next, a hydraulic control device A and an electric control device B that drive and control the hydraulic cylinder 13 and the hydraulic motor 15 using FIG.
I will explain about it. The hydraulic control device A includes a hydraulic pump 21, a control valve 22, and a power cylinder 2 driven by an engine (not shown).
The power steering device includes an electromagnetic switching valve 25 interposed in a power steering device consisting of a power steering device 3 and a reservoir 24. The electromagnetic switching valve 25 is set to the first state (the state shown in the figure) when not energized to supply oil discharged from the hydraulic pump 21 to the control valve 22, and is switched to the second state when energized to direct the hydraulic oil to the oil path. It is supplied to the upper reservoir chamber of the cylinder tube 13a via P1. A check valve 26 is interposed in the oil passage P1, and the check valve 26 prevents the hydraulic oil from flowing back to the electromagnetic switching valve 25 in the oil passage P1. Note that the lower reservoir chamber of the cylinder tube 13a communicates with the reservoir 24. An oil passage P2 branches from oil passage PI between the check valve 26 and the cylinder tube 13a, and the oil passage P2 is connected to IJ.
Hydraulic oil is guided to the hydraulic motor 15 via the I7 valve 27 and the electromagnetic switching valve 28. The relief valve 27 is normally in the illustrated state and prohibits communication of the oil passage P2, and when the supply of hydraulic oil into one oil chamber of the cylinder tube 13a via the oil passage P1 is completed, the hydraulic pressure of the oil passages PI and P2 is When the piston 13c is sufficiently high (the piston 13c is sufficiently lowered and the vehicle body BD is sufficiently lifted), the oil passage P2 is allowed to communicate,
Hydraulic oil is supplied to the electromagnetic switching valve 28 via oil passages PI and P2. The electromagnetic switching valve 28 is set to the first state (the state shown in the figure) when not energized, closes the supply port communicating with the relief valve 27 and the discharge port communicating with the reservoir 24, and closes the input/output port of the hydraulic motor 15.
A and 15b are communicated with each other. In addition, the electromagnetic switching valve 28
is set to the second state (lower display position) in the first energized state, and supplies hydraulic oil from the relief valve 27 to the input/output port 15a of the hydraulic motor 15, and operates from the input/output port 15b of the motor 15. The oil is discharged into the reservoir 24 and the motor 15 is rotated normally. Furthermore, the electromagnetic switching valve 28 is set to the third state (upper display position) in the second energized state, and the hydraulic fluid from the relief valve 27 is transferred to the hydraulic motor 1.
5 input/output capo) 15b and the same motor 1.
The hydraulic oil from the input/output coupler 15a of No. 5 is discharged into the reservoir 24, and the motor 15 is reversed. Also, from the branch point of the oil passage P2 to the oil passage P1, the oil passage P3
The oil passage P3 further branches into the oil passage P4.
P5, and both oil passages P4 and P5 are provided with an electromagnetic switching valve 31 and a relief valve 32, respectively. When the electromagnetic switching valve 31 is de-energized, it is set to the first state (the state shown in the figure) to prohibit communication of the oil passage P4, and when it is energized, it is set to the second state to direct the oil passage P4 to the reservoir 24 via the throttle 31a. communicate. The relief valve 32 is normally in the state shown and prohibits communication of the oil passage P5, and the oil BP1-
When the oil pressure of P5 is higher than the oil pressure value required for maintaining the downward movement of the piston 13c and controlling the rotation of the hydraulic motor 15, the oil passage P5 is allowed to communicate with the reservoir 24. , a microcomputer 41 consisting of a CPU, RAM, input/output interface, etc.
The computer 41 executes a program corresponding to the flowchart shown in FIG. 4 to control the training wheel activation switch, rotation switch 42, rotation instruction switch 43, vehicle speed sensor 44, shift position detection switch 45, and lift completion detection. The electromagnetic switching valve 2 is activated in response to each signal from the switch 46, lowering completion detection switch 47, and brake switch 48.
Controls energization and de-energization of 5°28.31. The auxiliary wheel operating switch 42 is provided near the driver's seat and instructs the auxiliary wheel 11 to rise and fall, and when in the ON state, it instructs the raising and when in the OFF state, the auxiliary wheel operating switch 42 instructs the lowering. A return actuator 51 is attached to the auxiliary wheel operating switch 42, and the actuator 51 is controlled by the microcomputer 41 to return the auxiliary wheel operating switch 42, which is in the on state, to the off state. The rotation instruction switch 43 is provided near the driver's seat and instructs the rotation of the hydraulic motor 15 (auxiliary wheels 11).It instructs the stopped state of the motor 15 in the neutral state, and also instructs the same in the upper and lower can switching position. Directs forward and reverse rotation of the motor 15, respectively. A return actuator 52 is also attached to this rotation instruction switch 43.
is controlled by the microcomputer 41 to return the rotation instruction switch 43 in the vertical position to the neutral state. Vehicle speed sensor 44 detects the rotational speed of an output shaft of a transmission (not shown) and outputs a detection signal representing vehicle speed. The shift position detection switch 45 detects the operating position of the shift lever of the transmission and outputs a detection signal representing the operating position. Ascent completion detection switch 46 and descent completion detection switch 4
7 are both provided in the vicinity of the hydraulic cylinder 13, and the lift completion detection switch 46 is normally in an OFF state, but turns on when the auxiliary wheel 11 is raised and retracted to the lower surface of the vehicle body. Further, the lowering completion detection switch 47 is normally in an OFF state, and is turned ON when the auxiliary wheels 11 have lowered and the vehicle body BD has completed rising. The brake switch 48 is provided near the brake pedal 53 and is normally in an OFF state, but is turned ON only when the player's hand pedal 53 is depressed. This brake pedal 53 is equipped in a normal vehicle, and when the pedal 53 is depressed, the brake booster 54 causes each wheel FWI, FW2. RWI,
Brake oil is supplied to wheel cylinders 55a to 55d provided in RW2 to apply braking force to each wheel. Next, the operation of the embodiment configured as described above will be explained with reference to the flowchart of FIG. 4. When the ignition switch (not shown) is closed, the microcomputer 41 starts executing the program at step 60 in FIG. Run the settings. In this initial setting, the electromagnetic switching valves 25, 28.degree. 31 are each set to the state shown in FIG. After this initial setting, each detection signal from the vehicle speed sensor 44 and shift position detection switch 45 is read in step 62, and the condition is that the vehicle speed is rOJ and the shift lever is in the neutral (or parking) state. To,
It is detected that the vehicle is completely stopped. If the vehicle is not stopped now, based on the "NO" determination in step 62, it is determined in step 63 whether or not the auxiliary wheel operation switch 63 is turned on. In this case, if the auxiliary wheel operation switch 63 is not turned on, rNO, J is determined in step 63 and the program proceeds to step 65, but if the switch 42 is turned on, step Based on the determination of rYESJ in step 63, a drive signal is output to the return actuator 51 in step 64, and the program proceeds to step 65. Through the process of step 64, the return actuator 51 returns the auxiliary wheel activation switch 42 to the OFF state, so even if the auxiliary wheel activation switch 42 is operated while the vehicle is running, the operation is canceled. In step 65, the electromagnetic switching valve 25 is controlled to be de-energized, and the switching valve 25 is maintained in the first state. As a result, the oil discharged from the hydraulic pump 21 is transferred to the control valve 22.
Therefore, the power cylinder 23 assists in steering the left and right front wheels FWI and FW2 when the steering wheel is rotated while the vehicle is running. After the processing in step 65, the detection signal from the ascent completion detection switch 46 is read in step 66, and it is determined whether or not the switch 46 is in the on state. In this case, if the auxiliary wheel 11 has risen and is not completely retracted to the lower surface of the vehicle body BD, the electromagnetic switching valve 31 is energized in step 67 based on the determination of rNOJ in step 66, and the electromagnetic switching valve 31 is brought into the second state. can be switched to in this case,
Since the piston 13c is urged upward by the spring 14, the hydraulic oil in the first oil chamber of the cylinder chineave 13a flows through the oil passages PI, P3. P4 and the throttle 31a of the electromagnetic switching valve 31 to the reservoir 24, and the piston rod 13b is displaced upward, that is, the cylinder chinive 13a
The amount of protrusion is reduced. As a result, the support arm 12 swings counterclockwise in FIG. 3 using the upper end supported by the vehicle body BD as a fulcrum, and the auxiliary wheel 11 is controlled to rise. Then, until the raising of the auxiliary wheel 11 is completed, it is determined in step 66 that rNOj, that is, the raising completion detection switch 46 is not in the on state, and the circulation process consisting of steps 66 and 67 is repeatedly executed, and the auxiliary wheel 11 rise control continues. When the raising of the auxiliary wheel 11 is completed by this raising control and the auxiliary wheel 11 is retracted to the lower surface of the vehicle body BD, the raising completion detection switch 46 is turned on, so that it is judged as rYEsJ in STEP 6. Then, in Step 8, the electromagnetic switching valve 31 is de-energized and the open valve 31 is returned to the first state (initial state). After processing step 68, the program returns to step 6.
Returned to 2. If the vehicle is not stopped, the process consisting of steps 63 to 68 described above is repeatedly executed based on the above-mentioned "1 NO" determination in step 62. Now that the vehicle is stopped, rYEs is determined in step 62.
If it is determined to be J, the detection signal from the brake switch 48 is read in step 69, and it is determined whether or not the switch 48 is in the on state, that is, whether or not the brake pedal 53 is depressed. . In this case, if the brake pedal 53 is not depressed, the determination in step 69 is "NO", and the program proceeds to step 63, where steps 63 to 68 described above are performed. Therefore, even if the vehicle is stopped, if the brake pedal 53 is not depressed, the operation of the auxiliary wheel activation switch 42 is released, and the auxiliary wheel 1
1 remains stored on the underside of the vehicle body BD. On the other hand, when the vehicle is stopped and the brake pedal 53 is depressed, both "
YES”, and in step 70 the step 6 is
In the same manner as in step 3, it is determined whether the auxiliary wheel operation switch 42 is in the on state. In this case, if the auxiliary wheel operation switch 42 is not turned on (if the switch 42 is in the off state, the determination in step 70 is "NO", and the processes in steps 65 to 68 described above are executed). The auxiliary wheel 11 is maintained in a state stored on the lower surface of the vehicle body BD. Furthermore, the auxiliary wheel activation switch 42 is turned on, and it is determined in step 70 that the answer is "YES", that is, the switch 42 is in the on state. Then, in step 71, the detection signal from the lowering completion detection switch 47 is read and it is determined whether or not the switch 47 is in the on state.In this case, the lowering completion detection switch 47 must be in the on state. Ba,
That is, if the lowering of the auxiliary wheels 11 is completed and the vehicle body BD is not lifted up, it is determined in step 71 that it is rNOJ, and in step 72, the electromagnetic switching valve 25 is energized and the left 25 is set to the second state. Ru. After processing step 72, the program returns to step 71 and continues until the on state of the lowering completion detection switch 4 is detected.
The circular process consisting of steps 71 and 72 continues to be executed. During the circulation process, the electromagnetic switching valve 25 is set to the second state, so the oil discharged from the hydraulic pump 21 is transferred to the upper oil chamber of the cylinder tube 13a via the electromagnetic switching valve 25, the check valve 26, and the oil passage PI. will be supplied to With this supply of hydraulic oil, the piston 13c and the piston rod 13b are displaced downward against the urging force of the spring 14, and the rod 13b presses the intermediate position of the support arm 15 toward the lower left in FIG. 3. As a result, the support arm 15 swings clockwise in FIG. 3 using the upper end supported by the vehicle body BD as a fulcrum, and the auxiliary wheel 11 descends while moving in an arc and comes into contact with the road surface GR. In this case, the electromagnetic switching valve 28 remains in the first state (as shown in FIG. Since the motor 15 is in a rotatable state, after this auxiliary wheel 11 comes into contact with the road surface GR,
While the auxiliary wheel 11 rotates due to the external force from R, the supporting arm 15 continues to swing. As a result, the support arm 15 pushes up the lower surface of the vehicle body BD, so the vehicle body BD gradually rises, and as the left and right rear wheels RWI, RW2 move away from the road surface GR, the support arm 15 becomes substantially upright. When the vehicle body BD is lifted in this way, as described above, the auxiliary wheels 11 are rotated by external force from the road surface GR, so the auxiliary wheels 11 may be worn out due to friction with the road surface GR, or excessive force may be applied to the support arms. will not act or the vehicle body BD will be shaken significantly in the lateral direction. Further, in this case, the play cow pedal 53 is being depressed and the left and right front wheels are FWI. Since braking force is applied to FW2 and the left and right rear wheels RWI, RW2 by the brake oil supplied to each wheel cylinder 55a to 55d, the left and right front wheels FWI, FW2 do not rotate while the vehicle body BD is being lifted. The lateral vibration of the vehicle body BD is suppressed to a smaller extent, and even if there is an inclination on the road surface GR, the vehicle does not move along the inclination. Then, as a result of the vehicle body BD being lifted up, the piston 13c and piston rod tab, which have been displaced downward due to the supply of hydraulic oil to the cylinder tube 13a, reach the lowest point, and the lowering completion detection switch 47 is turned on. This ensures that during the cyclic process consisting of steps 71.72,
At step 71, it is determined that rYESJ, that is, the lowering completion detection switch 47 is in the on state, and the program proceeds to steps 73 to 81. On the other hand, in this state, the oil discharged from the hydraulic pump 21 does not further flow into the upper oil chamber of the cylinder tube 13a, so the working oil pressure in the oil passage PI-P5 increases. As a result of this rise, the relief valve 27 opens the oil passage P2 and starts supplying oil discharged from the hydraulic pump 21 to the electromagnetic switching valve 28. At this time, if the electromagnetic switching valve 28 is in the first state, the oil discharged from the hydraulic pump 21 does not pass through the left side 28, so the working oil pressure in the oil passages P1 to P5 further increases. Then, this working oil pressure is higher (
Then, the relief valve 32 allows the oil passage P5 to communicate with the oil passage P5, and the oil discharged from the hydraulic pump 21 flows through the oil passages PI, P3. It is discharged to the reservoir 24 via P5. In the processing of steps 73 to 81, it is determined in step 73 whether or not the auxiliary wheel operation switch 42 is in the on state in the same manner as the processing of step 63. In this case, if the auxiliary wheel operation switch 42 is in the on state as previously operated, it is determined in step 73 that rYEsJ, and in step 74, the brake switch 48 is turned on in the same manner as in step 69. It is determined whether or not it exists. Now, if the brake pedal 48 is also in the previous depressed state, the steering knob 74 determines YES, that is, the brake switch 48 is in the on state, and steps 75 to 77 are performed. In step 75, the signal from the rotation instruction switch 43 is read, and it is determined whether the direction rotation instruction switches 43 are in the stop instruction state (neutral state). In this case, if the rotation instruction switch 43 is maintained in the stop instruction state as the initial state, "NO" is selected in step 75.
is determined, and the program proceeds to step 77.
The electromagnetic switching valve 28 continues to be set to the first state as an initial state using the same step knob 77. As a result, the hydraulic motor 15 is not rotationally driven by the hydraulic oil flowing through the oil passage P2, and the vehicle stop is maintained in the state before the vehicle body BD was lifted. After processing step 77, the program proceeds to step 73.
The process is returned to Steps 73 to 75, and the circulation process consisting of steps 75 and 77 continues to be executed. During this circulation process, when the depression operation of the brake pedal 53 is released, the answer is "NO" in Step 74, that is, the brake switch 48 is turned off. It is determined that the switch is not in the on state, and the rotation instruction switch 4 is turned off in step 78.
3 is read and the instruction state of the same rotation instruction switch 43 is determined. If the rotation instruction switch 43 is now in the stop instruction state, based on the determination in step 78, in step 79, the electromagnetic switching valve 28 is set to the first state, similar to the process in step 77. As a result, the hydraulic motor 15 is not rotationally driven by the hydraulic oil flowing through the oil path P2, and the vehicle is maintained in the state before the vehicle body BD was lifted. After processing step 79, the program returns to step 73 and steps 73, 74°78.79
The cyclic process continues to be executed. During this circulation process, when the rotation instruction switch 43 is operated to switch to the forward rotation instruction state, the electromagnetic switching 28 is switched to the second state (lower side in FIG. display position). As a result, the oil discharged from the hydraulic pump 21 via the oil passage P2 and the relief valve 27 is supplied to the inflow/outflow boat 15a of the hydraulic motor 15, and the hydraulic oil from the inflow/outflow boat 15b of the motor 15 is supplied to the reservoir 24. As the water is being discharged, the hydraulic motor 15 rotates normally and starts rotating the auxiliary wheel 11 clockwise in FIG. 3. As a result, as shown in Figure 5, the parallel parked vehicle rotates counterclockwise around the front of the vehicle, as shown by the solid line in the figure, and the space in front and behind the vehicle becomes narrower. Even if the vehicle is parked, the vehicle can be pulled out of the parked state. Further, when the rotation instruction switch 43 is operated to switch to the reverse rotation instruction state, the electromagnetic switching valve 28 is switched to the third state (the upper display position in FIG. 1) by energization control in step 81 based on the determination in step 78. is set to As a result, the oil discharged from the hydraulic pump 21 via the oil path P2 and the relief valve 27 is transferred to the inflow/outflow port (15) of the hydraulic motor 15.
b, and the inflow/outflow boat 15a of the same motor 15
Since the hydraulic oil is discharged into the reservoir 24, the hydraulic motor 15 reverses and starts rotating the auxiliary wheel 11 counterclockwise in FIG. 3. As a result, when the vehicle is stopped as shown in Figure 5, it rotates counterclockwise around the front of the vehicle, as shown by the broken line in Figure 5, so it can be used even in places where the space in front and behind the vehicle is narrow. The vehicle can be parallel parked. On the other hand, such step 73. 74. 78-81
When the brake pedal 53 is depressed while the rotation of the auxiliary wheel 11 is being controlled by the circulation process consisting of the following, it is determined in step 74 that rYEsj has occurred, and the program proceeds to step 75 described above. At this time, if the rotation instruction switch 75 instructs forward rotation or reverse rotation, it is determined in step 75 that rYEsJ, and in step 76, a drive signal is output to the return actuator 52, and the acticoator 52 instructs rotation. The switch 43 is returned to the stop instruction state (neutral state). Also in this case, the electromagnetic switching valve 28 is
is set to the first state, and the hydraulic motor 15 is not rotationally driven. As a result, when the rear part of the vehicle body BD is moved laterally using the auxiliary wheels 11, if the vehicle starts to move in a direction not intended by the driver due to the slope of the road surface GR, the driver can brake the vehicle. When the pedal 53 is depressed, rotation control of the auxiliary wheels 11 is stopped, and the left and right front wheels FW are
Braking force is applied to I and FW2, and the movement of the vehicle can also be stopped. Furthermore, during the circulation processing of steps 73 to 81 as described above, when the auxiliary wheel operation switch notch 42 is operated to switch to the OFF state, rNOj is determined in step 73, and the program returns to steps 65 to 68 described above. You can proceed to As a result, the electromagnetic switching valve 25 is switched to the first position as in the initial stage.
The state is set and the oil discharged from the hydraulic pump 21 is controlled by the control valve 2.
At the same time, the auxiliary wheels 11 are stored in the lower surface of the vehicle body BD. In the above embodiment, when the electromagnetic switching valve 28 is in the first state (the state shown in FIG. 1), the hydraulic motor 15
However, a throttle is provided in the electromagnetic switching valve 28, so that when the electromagnetic switching valve 28 is in the first state, the inflow/outflow ports 15a and 15b are in direct communication with each other. 15b may be communicated through the aperture. As a result, free rotation of the auxiliary wheel 11 can be restricted, and unnecessary rotation of the auxiliary wheel 11 can be prevented when the auxiliary wheel 11 is stored in the vehicle body BD, when the auxiliary wheel 11 is raised and lowered, and when the vehicle body BD is maintained lifted. It can be eliminated. Further, in the above embodiment, the auxiliary wheel 11 is provided near the center of the rear of the vehicle body BD, but it may be provided near the center of the front portion of the vehicle body, that is, the left and right front wheels FWI, FW2. In this case, the front part of the vehicle body BD rotates left and right around the rear part.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a hydraulic and electrical control device according to an embodiment of the present invention, FIG. 2 is a schematic side view of a vehicle according to the embodiment, FIG. 3 is a rear view of the vehicle, and FIG. FIG. 1 is a flowchart of a program executed by the microcomputer, and FIG. 5 is a plan view of a vehicle showing one way of using the auxiliary wheels according to the same embodiment. Explanation of symbols A...Hydraulic control device, B...Electrical control device, BD...
...Vehicle body, GR...road surface, 10. - Hydraulic jack mechanism, II... Auxiliary wheel, 12. Support arm, 13... Hydraulic cylinder, 15... Hydraulic motor, 25. 28. 3
DESCRIPTION OF SYMBOLS 1... Solenoid switching valve, 41... Micro convenience store valve, 42... Auxiliary wheel operation switch, 43... Rotation instruction switch, 46... Ascent completion detection switch, 47...
・Descent completion detection switch, 48...brake switch, 53...brake pedal. Applicant Toyota Motor Corporation Representative Patent Attorney Teru Hase (1 other person) Figure Reno Data Brake Switch Brake Pedal Figure

Claims (1)

[Claims] a support arm that is supported at its upper end so as to be swingable around an axis in the longitudinal direction of the vehicle body at the front or rear part of the vehicle body, and that supports an auxiliary wheel rotatably around an axis in the longitudinal direction of the vehicle body at its lower end; The support arm is supported by a part of the vehicle body located on the side of the support arm so as to be able to swing around an axis in the longitudinal direction of the vehicle body, and extends diagonally downward, and is located at an intermediate position of the support arm at its lower end. In the auxiliary wheel device for a vehicle, the auxiliary wheel device includes a linear actuator that is assembled rotatably around an axis in the longitudinal direction of the vehicle body and expands and contracts to swing the support arm around the axis in the longitudinal direction of the vehicle body with the upper end portion as a fulcrum. a rotation instruction switch that instructs rotation and stop of the auxiliary wheel; and when the rotation instruction switch instructs the rotation of the auxiliary wheel, the auxiliary wheel is rotationally driven, and the rotation instruction switch instructs the rotation of the auxiliary wheel to stop. 1. A auxiliary wheel device for a vehicle, comprising: a rotary actuator that rotatably maintains the auxiliary wheel by an external force when the auxiliary wheel is in use.