JP2987972B2 - Fifth wheel device for vehicle turning - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is directed to a
The present invention relates to a fifth wheel device for a vehicle that includes a wheel and raises and lowers the wheel at a predetermined angle.

[0002]

2. Description of the Related Art An ordinary so-called 2W steering only the front wheels.
When parking an S car in a narrow place, it is necessary to repeat the turning operation of frequently operating the steering wheel, which is extremely inconvenient for a veteran driver. (Jpn.
584) and others. 1-7758
No. 4 mainly shows FIGS. 13, 14 and 15.
As shown in the figure, a cross member 4 is slidably supported via a slider 3 on guide rails 2 and 2 'fixed substantially in the front-rear direction of the vehicle at the rear lower surface of a front wheel drive type vehicle 1 capable of locking one of the front wheels. A wheel carrier 7 integrally provided with an arm 5 rotatably mounted on the cross member 4.
A fifth wheel for turning (hereinafter, referred to as a fifth wheel) 6 is supported via a spindle, and a link 8 having one end attached to the vehicle body so as to be able to rotate in the front-rear direction of the vehicle is connected to the carrier 7. The cross member 4 is moved by an actuator 9 to make the fifth wheel 6 substantially vertical from horizontal, so that the rear wheels 17, 17 'are lifted. Fifth wheel device for turning a vehicle having the above-mentioned lifting device (MM system)
A so-called front-wheel drive vehicle, which drives the front wheels, is often used. For example, as shown in FIG. 17, a transaxle 14 including an engine 11, a clutch 12, and a differential mechanism 13 on the axes of the front wheels 10, 10 'is provided. Are arranged in series, and are configured to transmit the power of the engine 11 to the front wheels 10, 10 ′ via these drive mechanisms. Also,
As shown in FIG. 15, the automobile 1 uses a so-called diagonal split system as its service brake system, and constitutes a slope transmission assistance device (HSA). That is, one of the split master cylinders 16 operated by the brake pedal 15 is the brake 1 of the right front wheel 10.
0a and brake pipe 1 to brake 17'a of left rear wheel 17 '
8 ', the other is the brake 1 for the left front wheel 10'
0'a and brake pipe 18 to brake 17a of right rear wheel 17
The brake switch (H) is provided by providing a master cylinder 16 with an electromagnetic check valve 19 of a braking device as disclosed in, for example, Japanese Patent Application Laid-Open No. 60-12360.
When the SA switch 20 is turned on, brake oil is confined in the pipe 18 'to lock the brake 10a of the front wheel 10 and the brake 17'a of the left rear wheel 17'.
When the car 1 having the above configuration is to be parked in a narrow place, this will be described with reference to FIG. 17. First, the front part of the car 1 is obliquely plunged from behind into a place to be parked, and a foot brake is applied. When the cross member 4 is slid toward the link 8 within the guide rails 2 and 2 'by the actuator 9, the link 8 is rotated downward and the wheel carrier 7 is moved to the fifth wheel as shown in FIG. 6 is assumed to be substantially vertical from horizontal. As a result, the rear wheels 17,1 of the car
7 'floats, so here one of the front wheels (eg right wheel 1
0) is locked in the brake state by the brake switch 20, the brake 10'a of the left front wheel 10 'is released, and the automobile 1 is moved forward, so that the differential mechanism 13 rotates the other front wheel 10' forward. Therefore, the vehicle 1 is rotated by the fifth wheel 6 about one of the front wheels 10 so that the vehicle can be parked at a predetermined parking position. After the parking is completed, the foot brake is applied again, and the cross member 4 is slid by the actuator 9 in the guide rails 2 and 2 'to the opposite side of the link 8, so that the link 8 rotates upward while the wheels rotate. The fifth wheel 6 is changed from vertical to horizontal by using the carrier 7. As a result, the rear wheels 17, 17 'of the automobile land, so that the brake lock of one of the front wheels (for example, the right wheel 10) is released and the normal parking brake is applied. When exiting from the parking position, the brake is applied in the same manner as described above, and then the cross member 4 is slid toward the link 8 in the guide rails 2, 2 'by the actuator 9 as shown in FIG. Makes the fifth wheel 6 substantially vertical from horizontal by rotating the wheel carrier 7 while rotating downward. As a result, the rear wheels 17, 17 'of the vehicle float, so that one of the front wheels (for example, the right front wheel 10) is locked in the brake state as described above, and the brake 10'a on the other side 10' is released to release the vehicle 1 Backward, the differential mechanism 13
As a result, the other front wheel 10 'rotates rearward, so that the fifth wheel 6 rotates the vehicle 1 around the one of the front wheels 10 in the opposite direction, thereby causing the rear portion of the vehicle to escape from the parking position. Here, the brake is applied again, the actuator 9 is operated in the opposite direction to the above, and the cross member 4 is slid in the direction away from the link 8 in the guide rails 2, 2 ', so that the link 8 rotates upward. Then, the fifth wheel 6 is changed from vertical to horizontal by using the wheel carrier 7. As a result, the rear wheels 17, 17 'of the vehicle land, so that the brakes and the brake locks are released, and the vehicle retreats as usual,
Then go forward. With the above configuration, parking is much easier than before, and if the functions inherent in the vehicle are used, there is no need to provide a special drive mechanism for driving the fifth wheel, and the mechanism is simplified. The cost can be reduced, the weight can be reduced, and there is no problem in weight balance.

[0003]

However, in the construction disclosed in Japanese Utility Model Laid-Open No. 1-77584, the fifth wheel 6 is positioned at a predetermined angle with respect to the center axis of the vehicle, that is, the fifth wheel 6 is moved from the front wheel 10 which is the center of rotation. With the fifth wheel 6 oriented in the tangential direction of a circle having a radius equal to the distance to the five wheels 6, the lifting device is fixed to the lower surface of the vehicle body via the guide rails 2, 2 '. Therefore, for example, the behavior of the vehicle at the time of parking is univocal, and the turning radius and the turning direction cannot be changed. The present invention relates to the fifth vehicle turning method described above .
In a vehicle equipped with a wheel device , the turning radius and the turning direction of the vehicle when the fifth wheel is used can be changed so that the vehicle can have a greater degree of freedom in the action of the vehicle. It was invented for the purpose of making it possible to perform it safely and securely.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a fifth wheel is substantially erected from a horizontally stored state by a control signal on a turntable rotatably installed on the lower surface of a vehicle body, and the vehicle body is lifted. A pattern selection switch for selecting a rotation mode of the turntable, a detection and setting of a steering angle based on a selection signal of the switch, and a rotation device for the turntable. and a control means for issuing an actuation signal to the fifth wheel lifting device is provided, the instructions of the pattern selection switches
Setting of turntable rotation angle and vehicle turning operation
A first invention for selecting, a brake lock device for locking one brake of the front wheel with the brake applied and releasing the lock when an accelerator pedal is depressed, and a turn rotatably installed on the underside of the vehicle body A pattern selection switch for selecting a rotation mode of the turntable in a vehicle equipped with an elevating device that raises the vehicle body by raising the fifth wheel substantially from a horizontally stored state by a control signal on a table, and a selection signal of the switch Control means for detecting or setting the steering angle on the basis of, and issuing an operation signal to the turning device of the turntable and the fifth wheel elevating device,
Turntable according to the instruction of the pattern selection switch
And the second invention for selecting the turning angle of the vehicle and selecting the vehicle turning operation .

[0005]

[Operation] In the fifth wheel apparatus for turning a vehicle according to the present invention, at the time of its operation, signals from various sensors described later are first read into a controller, and the rotation of the engine is idling rotation.
When the vehicle speed is 0 (ie, stop) and the transmission gear is in a neutral position (neutral position), the steering angle of the steering wheel is read, and the brake pedal is depressed.
A system that constitutes the fifth wheel device for turning a vehicle (hereinafter referred to as MM system)
Circuit ) . Here, the behavior of the vehicle using the MM system is scheduled, that is, (1) the vehicle is rotated around one of the front wheels with a minimum turning radius or (2) the vehicle is on an extension of a line connecting the front wheel axes. One of the pattern selection switches is turned ON in order to select one of the following: a small turn around the temporary rotation center or (3) a vehicle running obliquely at a fixed angle in the steering operation direction.
Thereby, the controller (1) to (1) to
In accordance with (3), the steering angle is detected (0 or not) or set. If the conditions are satisfied, the rotation motor of the turntable is driven, and the actuator of the fifth wheel is moved down (down). The vehicle is driven, the motor and the actuator are stopped at a predetermined position, and the vehicle is raised by the fifth wheel oriented in a predetermined direction. Further, if necessary, the transmission gear is in the first speed (or reverse), and the HSA is ON. Then, the accelerator pedal is depressed, and the vehicle is caused to perform the predetermined action using the fifth wheel.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. First, the lifting device 18 of the fifth wheel 6 in the present embodiment is a compact one as shown in FIGS. 1 to 4, and one end 21 a is supported on a turntable 28 described later via a bracket 19 and a bearing 20. The other end 2 of the operating arm 21 rotated by the hydraulic actuator 22
1b and one end 23a at a predetermined distance from the operating arm 21.
The other end 23b of a support link 23 rotatably supported by a bearing 24 on a turntable 28 is rotated by a pin shaft 27 to both ends of an upright arm 26 of a wheel carrier 25 that horizontally supports the fifth wheel 6. It is connected freely. With the above configuration, the operation of the actuator 22 causes the operation arm 21 to rotate counterclockwise in FIG.
For example , the upright arm 26 whose one end is regulated by the support link 23 is thereby rotated clockwise, and the fifth wheel 6 is rotated with its right end down, and as the fifth wheel 6 that comes into contact with the ground is upright, The vehicle can be levitated. Reference numeral 28 denotes a turntable, on the lower surface of which is a lifting device 18 for the fifth wheel 6.
However, it is mounted as described above on the line AA of FIG. Accordingly, the operation directions of the operation arm 21 and the support link 23 match the direction of the line AA. Turntable 2 above
A turning gear mechanism 29 is provided on the upper surface of the turntable 8 so that its center substantially matches the center of the turntable 28. As shown in FIGS. 1 and 2, the internal gear 32 is supported on the inner periphery of a support ring 30 via a ball bearing 31. The internal gear 32 is attached to the turntable 28, 30 is fixed to the vehicle body B with a bolt 34 or the like, with the support plate 33 interposed therebetween.
And a motor 36 with a speed reduction mechanism having a pinion 35 meshing with the support plate 32. Reference numeral 37 denotes a sensing plate which surrounds the outer surface of the support ring 30 by a predetermined angle, for example, 120 ° (60 ° each) around two upper and lower chips 38a and 38b mounted on the line AA of the support ring 30 and is a turntable. 28. As shown in FIG. 5, the sensing plate 37 has two upper and lower positions at the center position () according to the height of the chips 38 a and 38 b, for example, a position () below the left and right 30 ° from the line A-A. One by one, for example, 5
Chips 38a, 3 are placed one by one at the position (,) above 5 °.
Holes 37a to 37f having substantially the same size as 8b are formed, and angle sensors 39a to 39f are provided outside thereof. If the sensors 39a to 39f are connected to a controller (controller) 55 to be described later to pick up a signal for each angle, the motor 36 with the speed reduction mechanism is driven to drive the pinion 35, the internal gear 32, When the fifth wheel 6 and its lifting / lowering device 18 are rotated via the turntable 28, the front of the tip 38a or 38b is cut through the holes 37a to 37b.
37f, and the angle sensors 39a-39
f is activated to emit a signal, and it is detected that the turntable 28 is at the center position or has rotated left or right by a predetermined angle, and the signal drives or stops the motor 36.
Can be done . The fifth wheel 6 is used as shown in FIG. That is, the mounting portion 4 of the wheel carrier 25
Bearings 43 and 43 'are fitted to journal portions 42a and 42b of a spindle 42 which can be fixed to the bolts 41 at 0, and a wheel hub 44 is mounted via the bearings 43 and 43'. In the illustrated example, a brake device 45 is fixed to the inside of the hub 44 by a wheel pin 46 having a screw. Outside the wheel hub 44, a tire T serving as a turning wheel is set in accordance with the wheel pin 46, and a wheel nut It is fixed at 47. As shown in FIG. 2, the fifth wheel 6 is configured so that pressure oil generated by a brake pedal is supplied to the brake device 45 via a relay joint 48 and a flexible hose 49 attached to the support plate 33. ing. The support plate 33 is provided with wiring 51 via the relay connector 50 together with the relay joint 48, and the wiring is formed by the angle sensors 39a to 39a.
39f. The fifth wheel having the above configuration and its rotating and lifting device are provided on the rear lower surface of the vehicle, and the entire drive and control device is as shown in FIG. That is, in FIG. 7, reference numeral 52 denotes a hydraulic pump driven by the engine E.
3 is connected to the power steering unit 54 and the hydraulic actuator 22 of the fifth wheel lifting / lowering device 18. 55 is a CPU, interface, RAM, RO
M, an engine rotation sensor 56 provided on the engine E, a vehicle speed sensor 57 and a neutral sensor 58 provided on the transmission M, and a switch box 5 described later.
9. Signals from detection devices such as a turning angle sensor 60 provided in the steering mechanism S, a brake switch 61 that is turned on when the brake B is depressed, and angle sensors 39a to 39f of the turntable 28 are input, and based on the signals. A comparison and calculation are performed, and a drive, stop, or display command signal is sent to the electromagnetic switching valve 53, the motor 36 with a speed reduction mechanism, and a display lamp (not shown). As shown in FIG. 9, the switch box 59 is, for the MM system, a vehicle's normal state 59a, a schematic side view of the vehicle displaying the rear floating time 59b, arrow indicators 59a 'and 59b', and a plane of the vehicle. The arrow indicator 5 indicating the direction of movement of the vehicle with the schematic indicating portion 59c.
9c 'is provided, and above it, the behavior of the vehicle using the MM system is scheduled, that is, (1) whether the vehicle is rotated around one of the front wheels with a minimum turning radius (FIG. 8).
(A)), (2) Whether the vehicle makes a small turn around the temporary idle rotation center on the extension of the line connecting the front wheels (FIG. 8)
(B)), (3) pattern selection switches 62a to 62c are provided for selecting whether the vehicle is to run obliquely at a fixed angle in the steering operation direction (FIG. 8C).
The HSA system HSA switch brake switch 20 is provided outside the one section 63 for the M system. FIGS. 10 to 12 show flowcharts in the fifth wheel device of the present invention, and the operation of the device of the present invention will be described below based on the flowchart. FIG. 10 shows that the vehicle is rotated around one of the front wheels with a minimum radius as shown in FIG.
The processing when the pattern selection switch 62a is selected will be described.
7, 58, 61, 38a to 38f and signals from the switch box 59 are read into the controller 55 (step P1), the engine is rotating (step P2), the vehicle speed is O (step P3), and the transmission M If the gear is neutral (step P4), the turning angle of the steering wheel S is read (step P5), and the brake switch 61 is turned on by depressing the brake pedal B.
Then, the circuit of the MM system is turned on (Step P7). Here, the pattern selection switch A (6
When 2a) is turned ON (step P8), it is checked whether the steering angle is O (step P9),
If the turning angle is O, that is, if the front wheels 10, 10 'are straight in the front-rear direction, the process proceeds to steps P10 and P11. In step P10, the electromagnetic switching valve 53 is switched to drive the fifth wheel 6 in the descending direction, and the hydraulic oil from the hydraulic pump 52 is sent to the hydraulic actuator 22.
A drive signal is sent from the controller 55 to the motor 36 with a speed reduction mechanism for rotating the turntable 28, and the lifting device 18 of the fifth wheel 6 is rotated clockwise through the turntable 28, and the chip 38b is The hole 37 is set at the α-degree angle of FIG.
Since the signal is generated through the angle sensor C and confronts the angle sensor 39C, the motor 36 with the speed reduction mechanism is stopped via the controller 55 by the signal (step P12). The fifth wheel 6 raises the vehicle in a state where the fifth wheel 6 is rotated by a predetermined angle α ° with respect to the center of the vehicle, and the controller 55
The electromagnetic switching valve 53 is switched according to the command (1) to stop the hydraulic actuator 22 (Step P12). If the transmission gear of the transmission M is in the first speed (1st) or reverse (REV) in step P13, the preparation is completed by turning on the HSA switch 20 here. Thus, one of the front wheels, for example, the right front wheel 10 is locked, so that the accelerator pedal is depressed and the fifth wheel 6 can be used to cause the vehicle to perform a clockwise action. FIG. 11 is a perspective view of the temporary rotation center O on the extension of the line connecting the front wheel shaft centers as shown in FIG.
The processing when the pattern selection switch 62b is selected to make a small turn around the center is shown. In this case, the same operation is performed up to step P7 when the selection switch 62a is selected, and the operation after step P7 is as follows. That is, when the pattern selection switch B (62b) is turned on (step P15), it is checked whether or not the steering angle is 0 (step P16), and the steering angle is 0, that is, the front wheels 10, 10 'move in the front-rear direction. If you look straight,
The process proceeds to steps P17 and P18. In step P17, the electromagnetic switching valve 5 is driven to drive the fifth wheel 6 in the descending direction as described above.
3, the hydraulic oil from the hydraulic pump 52 is sent to the hydraulic actuator 22, and at step P18, a drive signal is sent from the controller 55 to the motor 36 with a speed reduction mechanism for rotating the turntable 28, and the turntable 2 is turned on.
8, the lifting device 18 of the fifth wheel 6 is rotated clockwise, and the tip 38 a is rotated through the hole 37 d at the position where the tip 38 a is rotated by the preset β degree, for example, 55 ° in FIG. 39d, and generates a signal.
6 is stopped (step P19). The fifth wheel 6 raises the vehicle while rotating the predetermined angle β with respect to the center of the vehicle as described above, and switches the electromagnetic switching valve 53 by the command of the controller 55 to stop the actuator 22 at the upper limit (step P19). . Here, at step P20, the transmission M
Is the first speed (1st) or reverse (REV)
In this case, the driver can depress the accelerator pedal and use the fifth wheel 6 to make the vehicle perform a small clockwise turn. FIG. 12 shows a process when the pattern selection switch 62C is selected in order to make the vehicle run obliquely at a certain angle in the steering operation direction as shown in FIG. 8C. Also in this case, the same applies to step P7 when the selection switch 62a is selected, and the following steps from step P7 are as follows. That is, the pattern selection switch C (62C) is set to O
N (Step P21), when the steering angle is set to, for example, 30 ° (Step p22), a drive signal is sent from the controller 55 to the motor 36 with the speed reduction mechanism,
The lifting device 18 of the fifth wheel 6 is rotated clockwise via the turntable 28 (step p23). The turntable 28 is rotated, and a sensor (not shown) causes ε in FIG.
° (30 °) + 90 ° is sensed, and the steering angle (30 °) set by the ε ° in the controller 55
(Step P24), the motor 36 with the speed reduction mechanism is stopped (Step P25). In this state, next, at step P26, the electromagnetic switching valve 53 is switched to drive the fifth wheel 6 in the descending direction, and the hydraulic oil from the hydraulic pump 52 is sent to the hydraulic actuator 22. This makes the fifth
Wheel 6 raises the vehicle and at its upper limit the controller 55
The electromagnetic switching valve 53 is switched in response to the command to stop the hydraulic actuator 22 (step P27). If the transmission gear of the transmission M is in the first speed (1st) or the reverse (REV) in step P28, the accelerator pedal is depressed, and the vehicle can perform an oblique movement using the fifth wheel 6.

[0007]

According to the present invention, the fifth wheel is horizontally mounted on a turntable rotatably installed on the lower surface of the vehicle body by a control signal.
A pattern selection switch for selecting a rotation mode of the turntable and a detection or setting of a steering angle based on a selection signal of the switch are performed on a vehicle equipped with an elevating device for elevating the vehicle body substantially upright from a delivered state. And control means for issuing an operation signal to the turntable rotating device and the fifth wheel lifting / lowering device, wherein the pattern selection switch is provided.
Setting of the turntable rotation angle and the car
A first invention for selecting both turning operations, a brake lock device for locking one brake of the front wheel in a state where the brake is applied, and releasing the lock when the accelerator pedal is depressed, and a rotatable lower surface of the vehicle body A pattern selection switch for selecting a rotation mode of the turntable on a vehicle equipped with an elevating device that raises the vehicle body by lifting the fifth wheel substantially from a horizontal storage state by a control signal on a turntable installed in the vehicle; performs detection or setting of steering angle based on the switch selection signals, and providing a control means for issuing an operation signal to the rotation device and the fifth wheel lifting device of the turntable, data as directed by the pattern selecting switch
Setting of the turning angle of the turntable and selection of the vehicle turning operation
Because and a second of the present invention to carry out, in a vehicle equipped with a fifth wheel for a vehicle turning, turning radius of the vehicle when using a fifth wheel, it is possible to change the rotation direction, the minimum rotating (1) the vehicle Rotate around one of the front wheels by a radius to make a U-turn or the like with a small radius, or (2) make the vehicle make a small turn around the temporary rotation center on the extension of the line connecting the front wheel axes. Or (3) the vehicle can be run obliquely at a fixed angle in the steering operation direction to facilitate the pulling of the vehicle, thereby giving a large degree of freedom to the behavior of the vehicle. In addition, since the operation is automated in accordance with the behavior of the vehicle with the above configuration, the burden on the driver is small and the operation can be performed safely and reliably.

[Brief description of the drawings]

FIG. 1 is a plan view of a lifting / lowering / rotating device of a fifth wheel for turning a vehicle according to the present invention;

FIG. 2 is a cross-sectional view corresponding to the line AA in FIG. 1;

FIG. 3 is a plan view of an elevating device in the fifth wheel device for turning a vehicle according to the present invention;

FIG. 4 is an exploded perspective view of a lifting / lowering / rotating device of a fifth wheel for turning a vehicle according to the present invention;

FIG. 5 is a development view of a sensing plate,

FIG. 6 is a sectional view of a fifth wheel,

FIG. 7 is an overall system diagram of a fifth wheel device for turning a vehicle according to the present invention;

FIG. 8 is an explanatory view of the operation,

FIG. 9 is a front view of the switch box,

FIG. 10 is a flowchart when a first pattern is selected,

FIG. 11 is a flowchart when a second pattern is selected,

FIG. 12 is a flowchart when a third pattern is selected,

FIG. 13 is a perspective view of a conventional fifth wheel elevating device for turning.

FIG. 14 is a front view of FIG.

FIG. 15 is a plan view showing a braking device for a vehicle including the lifting / lowering device for the fifth wheel for turning.

FIG. 16 is a side view showing a parking state of the vehicle.

FIG. 17 is an operational plan view of a vehicle parked by using the fifth wheel elevating device. 6; 5th wheel, 10, 10 '; front wheel, 18; 5th wheel elevating device, 20; HSA switch, 21; operating arm, 22; actuator, 23; support link, 25; wheel carrier, 26; Arm, 28; turntable, 29; turning gear mechanism, 30; support ring, 32; internal gear, 35; pinion, 36; motor with reduction mechanism, 37; sensing plate, 38; chip, 39; Hydraulic pump, 53; electromagnetic switching valve, 55; controller, 56; engine rotation sensor, 57; vehicle speed sensor, 58; neutral sensor, 59; switch box, 60; turning angle sensor, 61; brake switch, E; engine B Brake pedal, M: transmission S: steering mechanism, T: tire.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-244745 (JP, A) JP-A-47-18734 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60S 9/21

Claims (2)

(57) [Claims] To 1. A turntable installed rotatably on the vehicle body lower surface, control signals the fifth wheel is ho from the horizontal storage state <br/> pot upright manner, in a vehicle equipped with a lifting device for floating the body, A pattern selection switch for selecting a rotation mode of the turntable; detecting or setting a steering angle based on a selection signal of the switch; and transmitting an operation signal to a rotation device of the turntable and a fifth wheel lifting / lowering device. Control means for issuing a command to the pattern selection switch.
Setting of turntable rotation angle and vehicle turning operation
A fifth wheel device for turning a vehicle, wherein selection is performed . 2. A brake lock device for locking one of the front wheels while the brake is applied and releasing the lock when an accelerator pedal is depressed, and a turntable rotatably mounted on the underside of the vehicle body. 5th signal
A pattern selection switch for selecting a rotation mode of the turntable is provided on a vehicle equipped with an elevating device that lifts a vehicle body by substantially raising the wheels from a horizontal storage state , and detecting or detecting a steering angle based on a selection signal of the switch. settings, and provided with control means for issuing an operation signal to the rotation device and the fifth wheel lifting device of the turntable, the putter
Rotation angle of the turntable by the instruction of the switch
And a vehicle turning operation is selected .