JPH0495553A - Auxiliary wheel device for vehicle - Google Patents

Abstract

PURPOSE:To get rid of any obliviousness for showing a turn signal by controlling a rotating actuator when a turn signal lever is operated and thereby making an auxiliary wheel so as to be rotated, in an auxiliary wheel device for a vehicle, which moves a part of a car body in the cross direction and makes a vertical parking or the like in a narrow place performable. CONSTITUTION:A hydraulic controller for an auxiliary wheel device, installing an auxiliary wheel 11 rotatable around an axis in the longitudinal direction of a car body in a rear part of the car body movably up and down to the car body by a hydraulic cylinder 13, is provided with a solenoid selector valve 25 installed in a power steering system, and at tie of the current-energization, a hydraulic fluid is fed to an upper oil chamber of a hydraulic cylinder tube 13. In addition, an oil passage P2 being branched off from another oil passage P1 between a check valve 26 and the hydraulic cylinder 13 is connected to an auxiliary wheel hydraulic motor 15 via a relief valve 27 and a solenoid selector valve 28. In this case, an output signal of a turn signal detecting switch 45 is inputted at a micro-processing unit 4, and when the body rear part is uplifted by the hydraulic cylinder 13, the hydraulic motor 15 is controlled according to operation of a turn signal lever.

Description

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

The present invention relates to a auxiliary wheel device for a vehicle that uses auxiliary wheels provided at the front or rear of the vehicle to move the rear or front of the vehicle in the lateral direction of the vehicle to enable parallel parking in narrow spaces.

[Prior art 1] Conventionally, this type of device has been used, for example, in
As shown in the publication, a jack attached to the rear of the vehicle lowers the auxiliary wheels toward the road surface and lifts the rear of the vehicle, and while the rear of the vehicle is lifted by the jack, the rotary actuator attached to the jack is moved. By driving, the auxiliary wheels are rotated around an axis in the longitudinal direction of the vehicle body, and the rear part of the vehicle body is rotated laterally around the front part of the vehicle body. [Problem to be Solved by the Invention 1] However, with the above conventional device, when moving the rear part of the vehicle body laterally using the training wheels, the driver is distracted by controlling the lowering and rotation of the training wheels. , there is a risk of forgetting to give direction instructions for the vehicle, which poses a problem of causing inconvenience to drivers of other vehicles and passersby. For this reason, in Utility Application No. 1-85980 "Auxiliary wheel device for vehicle", the applicant proposed a direction indicator provided on both the left and right sides of the vehicle in conjunction with the operation of the operator for controlling the rotary actuator. We have proposed a device that makes the lamp blink to ensure that you do not forget to issue the direction instruction. However, in this proposed device, it is necessary to newly install the above-mentioned controls near the driver's seat, which increases the number of controls near the driver's seat, making operation complicated, and there are concerns about space for installing the controls. Also, the problem of high installation cost arises. The present invention has been made to solve the above-mentioned problems, and its purpose is to eliminate the problem of forgetting to issue a direction instruction in the conventional device, and also to solve various problems caused by the provision of a new operator by the proposed device. The purpose of this invention is to provide a training wheel device. [Means for Solving the Problems] In order to achieve the above object, the structural features of the present invention are as follows:
The upper end part is attached to the front or rear part of the vehicle body, and the lower end part supports an auxiliary wheel so as to be rotatable around an axis in the longitudinal direction of the vehicle body. In the auxiliary wheel device for a vehicle, the auxiliary wheel device includes a jack that lifts the auxiliary wheel, and a rotary actuator that rotationally drives the auxiliary wheel around the axis, and when the front or rear part of the vehicle body is lifted by the jack, the auxiliary wheel device is provided on the steering handle part and rotates during normal driving. Auxiliary wheel rotation control means is provided for controlling the rotary actuator to rotate the auxiliary wheel in accordance with the operation of a direction indicating lever that instructs the turning direction of the vehicle. Effects and Effects of the Invention In the present invention configured as described above, the jack is provided on the steering handle part in a state where the auxiliary wheels are lowered and the front or rear part of the vehicle body is raised. When the direction indicating lever is operated, the auxiliary wheel rotation control means controls the rotary actuator to rotate the auxiliary wheel. As a result, when the front or rear of the vehicle moves laterally due to the rotation of this auxiliary wheel, the direction indication caused by the operation of the direction indication lever is always given, so there is no chance of forgetting to give a direction indication. This alerts drivers of other vehicles and passersby, and prevents them from being inconvenienced. In addition, since the auxiliary wheels are rotated using the existing direction indicator lever, there is no need to provide a new control for rotating the auxiliary wheels, and the situation where the number of controls near the driver's seat increases is avoided. This eliminates the problems of complicated operations, concerns about the space for installing the controls, and high installation costs. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. Figs. 2 and 3 are schematic views of a vehicle according to the embodiment as seen from the side and rear. This vehicle has left and right front wheels FWI, FW2 and left and right rear wheels RW.
1. In addition to the RW2, an auxiliary wheel 11 is provided as a fifth wheel, and the auxiliary wheel 11 is connected to the vehicle body B by a hydraulic jack mechanism 10.
It is assembled so that it can move up and down relative to D. The hydraulic jack mechanism 10 consists of a support arm 12 and a hydraulic cylinder 13, and the support arm 12 has its upper end on the rear lower surface of the vehicle body BD and is located approximately at the center position in the lateral direction of the vehicle and rotates around the axis in the longitudinal direction of the vehicle. It is swingably supported, and the auxiliary wheel 11 is supported rotatably around an 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 this 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 has a
Piston 1 that divides cylinder tube 13a into upper and lower chambers
3c is fixed. A spring 14 is housed in the lower chamber of the cylinder tube 13a, and the spring 14 always urges the piston 13c and the piston rod 13b upward. The support arm 12 is connected to the hydraulic motor 1 on the side opposite to the auxiliary wheel 11.
5 is fixed, and the rotating shaft of the motor 15 is connected to the central axis of the auxiliary wheel 11, as shown in FIG.
The auxiliary wheels 11 are driven to rotate forward or backward depending on the direction of supply and discharge of hydraulic oil. 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 supply 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 the oil passage P1 between the check valve 26 and the cylinder tube 13a, and the oil passage P2 guides hydraulic oil to the hydraulic motor 15 via a relief valve 27 and an 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 the upper reservoir 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, and the oil passage P
The hydraulic oil is supplied to the electromagnetic switching valve 28 via P2 and P2. When the electromagnetic switching valve 28 is de-energized, it is set to the first state (the state shown in the figure), and closes the supply boat 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 through an aperture 28a. Further, the electromagnetic switching valve 28 is in the second state (
(lower display position), the hydraulic oil from the relief valve 27 is supplied to the input/output port ↓5a of the hydraulic motor 15, and the hydraulic oil from the input/output port 15b of the motor 15 is discharged to the reservoir 24. The motor 15 is rotated forward. Furthermore, the electromagnetic switching valve 28 is in the third energized state in the second energized state.
state (upper display position), the hydraulic oil from the relief valve 27 is supplied to the input/output boat 15b of the hydraulic motor 15, and the hydraulic oil from the input/output boat 15a of the motor 15 is discharged to the reservoir 24. 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 also prohibits communication of the oil passage P1 to
When the oil pressure of P5 becomes 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. Electric I! ll# Device B is a microcomputer 41 consisting of ROM, CPU, RAM, input/output interface, etc.
The computer 41 executes a program corresponding to the flowchart in FIG. 4 to control the auxiliary wheel operation switch 42. Controls energization and de-energization of the electromagnetic switching valves 25, 28, and 31 according to signals from the vehicle speed sensor 43, shift position detection switch 44, direction indication detection switch 45, ascent completion detection switch 46, and descent completion detection switch 47. . 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 an on state, it instructs to raise the auxiliary wheel 11, and when in an off state, it instructs to lower it. 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 from the on state to the off state. Vehicle speed sensor 43 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 44 detects the operating position of the shift lever of the transmission and outputs a detection signal representing the operating position. The direction indication detection switch 45 is connected to the steering wheel 5 at the upper end.
2 is connected to the steering column 53, and outputs a detection signal representing the neutral position of the lever 54 and left/right direction instructions. Both the ascent completion detection switch 46 and the descent completion detection switch 47 are provided near the hydraulic cylinder 13, and the ascent completion detection switch 46 is normally in an OFF state and the auxiliary 1
When 1rll is raised and retracted to the underside of the vehicle body, it is turned on. 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 direction indication detection switch 45 is also connected to a direction indication lamp control circuit 55, and the III control circuit 55 detects the operation of the direction indication lever 54 by the direction indication detection switch 45 and turns on the direction indication lamps 56a to 56d. Control. Direction indicator lamp 56a. 56b are provided at the right front and rear parts of the vehicle body BD, respectively, and direction indicator lamps 56c and 56d are provided at the right front and rear parts of the vehicle body B.
When the neutral state of the direction indicator lever 54 is detected by the direction indicator detection switch 45, the direction indicator lamp control circuit 55 turns off all the direction indicator lamps 56a to 56d. Control. Further, when the direction indication detection switch 45 detects a right turn instruction of the direction indication lever 54, the direction indication lamp control circuit 55 causes the direction indication lamps 56a and 56b to blink I! When the detection switch 45 detects a left turn instruction for the vehicle from the instruction lever 54, the control circuit 55 turns on the direction instruction lamp 56c. Controls blinking of 56d. Next, the operation of the embodiment configured as described above will be explained with reference to the flowchart shown in FIG. When the ignition switch (not shown) is closed, the microcomputer 41 starts executing the program at step 60 in FIG. Execute processing. In this initial setting, the electromagnetic switching valve is 25°28.
31 are respectively set to the state shown in FIG. After this initial setting, each detection signal from the vehicle speed sensor 43 and shift position detection switch 44 is read in step 62, and the vehicle speed is "O" and the shift lever is in the neutral (or parking) state. Under the condition that the vehicle is completely stopped, it is detected that the vehicle is completely stopped. If the vehicle is not stopped now, based on the determination of rNOJ 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, it is determined that rNOJ is in step 63, and the program proceeds to step 65, but if the switch 42 is turned on, step 63 is determined to be rNOJ, and the program proceeds to step 65. Based on the determination that rYEsj, 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 1st state. As a result, the oil discharged from the hydraulic pump 21 is transferred to the control valve 22.
Since the steering wheel 5 is supplied to the steering wheel 5 while the vehicle is running,
The steering of the left and right front wheels FWI and FW2 accompanying the rotational operation of No. 2 is assisted by the power cylinder 23. 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 and controlled in step 67 based on the determination of "NO" in step 66. Can be switched to two states. On the other hand, since the piston 13c is urged upward by the spring 14, the hydraulic oil in the upper reservoir chamber of the cylinder tube 13a flows through the oil passages PI, P3. P4 and the throttle 3 of the electromagnetic switching valve 31
1a to the reservoir 24 and the piston rod 1
3b is displaced upward, that is, the amount of protrusion relative to the cylinder tube 13a is reduced. As a result, the support arm 12 is attached to the vehicle body B.
The auxiliary wheel 11 is controlled to rise by swinging counterclockwise in FIG. 3 using the upper end supported by D as a fulcrum. Then, in step 66, until the raising of the auxiliary wheel 11 is completed, rN
It is determined that the OJ, that is, the ascent 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 ascent control of the auxiliary wheels 11 is continued. 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 the determination in step 66 is "YES". Then, in step 68, the electromagnetic switching valve 31 is de-energized and the quantity valve 31 is returned to the first state (initial state). After the processing in step 68, in step 69, the auxiliary wheel operation switch 42, vehicle speed sensor 43, various detection switches 44 to 47, and electromagnetic switching valve 25°28.31 are checked, and abnormalities are detected in the various parts. In this case, it is determined in step 69 "rYES", that is, the turning control of the auxiliary wheels 11 is canceled, and the execution of the program is terminated in step 70. On the other hand, if no abnormality is detected in any of the various parts, the program returns to step 62 based on the determination of rNOJ in step 69. If the heavy vehicle is not stopped, the process consisting of steps 63 to 69 described above is performed based on the "No" determination made in step 62. The vehicle is currently stopped and rYES is selected in step 62.
If it is determined as J, in step 71 the step 63 is
In the same manner as above, it is determined whether the auxiliary wheel operation switch 42 is in the on state. In this case, the auxiliary wheel operation switch 4
2 is not turned on and the switch 42 is in the off state, rNOJ is determined in step 71, the processes in steps 65 to 69 described above are executed, and the auxiliary wheel 11 is moved to the lower surface of the vehicle body BD. Remains stored. Further, when the auxiliary wheel operation switch 42 is turned on and it is determined in step 71 that rYESJ, that is, the switch 42 is in the on state, the detection signal from the lowering completion detection switch 47 is read in step 72. It is determined whether the switch 47 is in the on state. In this case, if the descent completion detection switch 47 is not in the on state,
That is, if the lowering of the auxiliary wheels 11 is completed and the vehicle body BD is not lifted up, rNOJ is determined in step 72, and in step 73, the electromagnetic switching valve 25 is energized and the quantity valve 25 is set to the second state. be done. After processing step 73, the program returns to step 72, and continues until the ON state of the lowering completion detection switch 47 is detected.
The circular process consisting of steps 72 and 73 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 passes through the electromagnetic switching valve 25, the check valve 26, and the oil passage P1 to the upper oil chamber of the cylinder tube 13a. will be supplied to By supplying this hydraulic oil, the piston 13c and the piston rod 13b are displaced downward against the biasing 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 to come into contact with the road surface GR. In this case, the electromagnetic switching valve 28 remains initially set to the first state (the state shown in FIG. 1), and the inflow and outflow ports 15 a and 15 b of the hydraulic motor 15 are communicated via the electromagnetic switching valve 28 . Since the motor 15 is in a rotatable state, after the auxiliary wheel 11 comes into contact with the road surface GR, it is assisted by the outside from the road surface GR! While the support arm 111 rotates, the swinging of the support arm 15 continues. As a result, the support arm 15 pushes up the lower surface of the vehicle body BD, so that the vehicle body BD gradually rises. And left and right rear wheels RW
When I and RW2 move away from the road surface GR and the support arm 15 becomes substantially upright, the cylinder tube 13a
The piston 13c is displaced downward due to the supply of hydraulic oil to the piston 13c.
Then, the piston rond 13b reaches the lowest point, and the lowering completion detection switch 47 is turned on. When the lowering completion detection switch 47 is turned on in this manner, during the circulation process consisting of steps 72 and 73, rYEsJ is determined in step 72, and the program proceeds to step 74 and subsequent steps. 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 passages P1 to 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 open valve 28, so that the working oil pressure in the oil passages P1 to P5 further increases. When this working oil pressure becomes higher than necessary for controlling the lowering of the piston 13c and rotating the hydraulic motor 15, the relief valve 32 allows the oil passage P5 to communicate, and the oil discharged from the hydraulic pump 21 is Oil road PI, P
3. It is discharged to the reservoir 24 via P5. In step 74, a detection signal from direction indication detection switch 45 is read, and in step 9, the state of the switch is determined. If the direction indicator lever 54 is currently maintained in the neutral state and the direction indicator detection switch 45 is outputting a detection signal indicating that the lever 54 is in the neutral state, then in step 74
If it is determined that there is no direction instruction, the electromagnetic switching valve 28 is maintained in the first state (the state shown in FIG. 1) in step 75, and the program returns to step 62. This results in
In this case, while the vehicle body BD remains lifted, the circulation process consisting of steps 62, 71 to 75 continues to be repeatedly executed, and as described above, the oil discharged from the hydraulic pump 21 is transferred to the oil passages PI, P3, It continues to be discharged to the reservoir 24 via P5 and the relief valve 32. On the other hand, when the direction indicator lever 54 is operated to indicate a right turn instruction, and the direction instruction detection switch 45 begins to output a detection signal indicating the same operation, it is determined in step 74 that "right direction instruction" is made. At step 76, the electromagnetic switching valve 28
is set to the second state (lower display position in FIG. 1) by energization control. As a result, the discharged oil from the hydraulic pump 21 via the oil passage P2 and the relief valve 27 is supplied to the inflow/output boat 15a of the hydraulic motor 15, and the hydraulic oil from the inflow/output boat 15b of the same motor 15 is supplied to the reservoir 24. Therefore, the hydraulic motor 15 rotates forward to move the auxiliary wheel 11 to the third position.
It begins to rotate clockwise as shown in the figure. 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. On the other hand, at this time, the detection signal from the direction indication detection switch 45 is also supplied to the direction indication lamp control circuit 55, which controls the direction indication lamps 56a and 56b to blink. As a result, the direction indicator lamps 56a and 56b flash, so the driver can temporarily bank the vehicle that has escaped from the parallel parking, and then turn the vehicle to the right without operating the direction indicator lever 54 again. If the vehicle is moved forward while the direction indicator lamps 56a and 58b are kept flashing, the vehicle can be started. Further, when the direction indicating lever 54 is operated to indicate a left turn instruction state and the direction instruction detection switch 45 outputs a detection signal representing the same operation, it is determined in step 74 that "left direction instruction" is made, and step 77 Solenoid switching valve 28
is set to the third state (upper display position in FIG. 1) by energization control. 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 port 15b of the hydraulic motor 15, and the hydraulic oil from the inflow/output boat 15a of the motor 15 is supplied to the reservoir 24. The hydraulic motor 15 rotates in reverse to move the auxiliary wheel 11 to the third position.
It begins to rotate counterclockwise as shown in the figure. As a result, the stopped vehicle as shown in Figure 5 rotates counterclockwise around the front of the vehicle body, as shown by the broken line in the same figure, so that it can be used even in places where there is comfortable space in front and behind the vehicle. The vehicle can be parallel parked. At this time, the detection signal from the direction indication detection switch 45 is also supplied to the direction indication lamp control circuit 55, which controls the direction indication lamps 56c and 56d to blink. As a result, the driver operates the direction indicator lever 54 to indicate a left turn, thereby turning the direction indicator lamp 56c.
, 56d are flashing, the vehicle is stopped as shown in FIG. The same vehicle can be parallel parked. As can be understood from the above description of the operation, according to the above embodiment, the rotation of the auxiliary wheel 11 is controlled by the operation of the direction indicator lever 54 to move the rear part of the vehicle body BD to the front part of the vehicle body BD. The direction indicator lever 54 is used to indicate the turning direction of the vehicle on the normal traveling route, and when the lever 54 is operated, the blinking of the direction indicator lamps 56a to 56d is controlled. Therefore, when the vehicle body BD rotates, direction indications are always given by the direction indication lamps 56a to 56d. Therefore, when the rear part of the vehicle body BD moves laterally using the auxiliary wheels 11, the driver of the other vehicle and the passerby are alerted by not forgetting to give the direction instruction. You will no longer be inconvenienced. In addition, this direction indicating lever 5
4 has already been provided in the vehicle, so there is no need to provide a new operator for rotating the auxiliary wheel 11, and it is possible to avoid an increase in the number of operators near the driver's seat. There are no problems such as complicated operations, concerns about the space for installing the controls, and high installation costs. In the above embodiment, the auxiliary wheel 11 is provided near the center of the rear part of the vehicle body BD, but it may be provided near the center of the front part 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. A flowchart of a program executed by the microcomputer of the first cause, and FIG. 5 is a plan view of a vehicle showing one manner 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, 11... Auxiliary wheel, 12... Support arm, 13... Hydraulic cylinder, 15... Hydraulic motor, 25, 28, 31
... Solenoid switching valve, 41 ... Microcomputer, 42 ... Auxiliary wheel operation switch, 45 ... Direction indication detection switch, 46 ... Ascent completion detection switch, 4
7...Descent completion detection switch, 52...Steering handle, 54...Direction indicator lever, 55...Direction indicator lamp control circuit, 56a-56d...Direction indicator lamp. Applicant Toyota Motor Corporation Representative Patent Attorney Teru Hase (1 other person) Figure Figure Figure Figure

Claims (1)

[Claims] The upper end part is attached to the front or rear part of the vehicle body, and the lower end part supports an auxiliary wheel so as to be rotatable around an axis in the longitudinal direction of the vehicle body. In the auxiliary wheel device for a vehicle, the auxiliary wheel device includes a jack that lifts up the auxiliary wheel, and a rotary actuator that rotationally drives the auxiliary wheel about the axis, and when the front or rear portion of the vehicle body is lifted by the jack, the auxiliary wheel device is provided on the steering handle portion and rotates during normal driving. An auxiliary wheel device for a vehicle, comprising an auxiliary wheel rotation control means for rotating the auxiliary wheel by controlling the rotary actuator in accordance with the operation of a direction indicating lever that indicates a turning direction of the vehicle.