JPH11127612A - Agricultural working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural working machine, capable of reducing power transmission loss caused by a rope-shaped body and improving operability of controlling speed of the transmission. SOLUTION: This agricultural working machine is equipped with an operational member 1, which controls speed of a transmission for forward or backward motion of the machine, and switching member 4, provided in the vicinity of the transmission, which switches motion (forward or backward) of the machine, wherein power is transmitted from the operational member 1 to the switching member 4 via a rope-shaped body 2 to control speed of the transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural work machine for performing agricultural work such as tilling, soiling, ridges, and trenching.

[0002]

2. Description of the Related Art A walking type agricultural working machine is disclosed in
As shown in FIG. 7 of Japanese Patent No. 40564, a traveling wheel C for supporting an airframe B and an engine D for driving the traveling wheel C are provided.
A transmission E for shifting the rotational speed from the engine D and transmitting the speed to the traveling wheels C; an operating member F for switching the transmission E to a forward range and a reverse range to control the speed; And a steering operation body G that can be grasped by the user. The steering operation body G is configured to be grasped by both hands to perform a steering operation.

Generally, as shown in FIG. 7, the operating member F is provided to project rearward from a rear portion of the body B, and the speed of the transmission is changed from a position at which the steering operation body G is operated. In this case, since the agricultural working machine F is disposed at a position far away from the steering operation body G, the steering operation body G is operated. There was a problem that it was difficult to operate from the position.

Accordingly, the applicant of the present invention has provided a stay between left and right steering operation bodies, rotatably mounted an operation member on the stay, and provided an operation input shaft and the operation member interlocked with a transmission. A link member is interlocked and connected by two cords, and a switching member for switching the transmission system of the operating force of the operating member to one or the other of the cords is provided near the operating member to operate the steering operating body. The Japanese Patent Application No. Hei 8-171 has previously filed an application for an agricultural work machine in which the speed of the transmission in the forward and reverse ranges can be controlled by operating the operating member from a position where the operation is performed.
519).

[0005]

However, in the invention previously filed, a switching member is provided near an operating member disposed at a position distant from the transmission, and two cable-like members are provided. Since the speed of the transmission is controlled by using the cable, there is a large transmission loss of the operating force by the cord-like body, and there is room for improvement in the operability of the speed control, and the structure is complicated and the cost increases. There was a problem.

The present invention has been made in view of such circumstances, and a switching member for switching a transmission between a forward region and a reverse region is disposed near the transmission, and the switching member operates via a cord. By providing an operation member for controlling the speed of the transmission, a transmission loss of the operation force by the cord-like body can be reduced, and an agricultural work machine capable of improving the operability of the speed control is provided.

[0007]

According to a first aspect of the present invention, there is provided an agricultural working machine having a speed changeover device for performing speed control by switching a transmission between a forward movement region and a reverse movement region. A switching member for switching between the forward region and the reverse region is provided, and an operating member for operating the switching member via a cord to control the speed of the transmission.

According to the first aspect of the invention, the switching member is disposed near the transmission, and the switching member is operated via the cord by operating the operation member. It can be placed at a remote location. By operating the operating member with the switching member switched to the forward range side or the reverse range side with respect to the neutral position corresponding to the neutral point between the forward range and the reverse range of the transmission, the forward range and the reverse range are achieved. Speed can be controlled. Therefore, by mounting the operation member near the steering operation body of the agricultural work machine,
The operation member can be easily operated from the position where the steering operation body is gripped, and the steering operation during the speed control can be performed with stability.

Further, since the speed control is performed by operating the switching member by the operating force of the operating member, it is possible to transmit the operating force of the operating member to the switching member via a single cord. The transmission loss of the operation force by the cord-like body can be reduced, the operability of speed control can be improved, and the structure can be simplified, and the cost can be reduced.

In the agricultural work machine according to a second aspect of the present invention, the switching member projects from a rotatable rotating shaft and a side intersecting the axial length direction of the rotating shaft, and an arm interlocked with the operating member; It is characterized by comprising transmission means for switching the rotational force between forward rotation and reverse rotation and transmitting the transmission force to the transmission, and a switching operation body for switching the transmission means.

According to the second aspect of the invention, the operating force of the operating member is converted into a rotating force via the arm and the rotating shaft, and the rotating force can be transmitted to the transmission via the transmission means. Therefore, the operating force of the operating member can be smoothly transmitted to the transmission, and the gear shifting operation can be easily performed with a small operating force.

[0012] In the agricultural work machine according to a third aspect of the present invention, the transmission means includes a rotatable operation input shaft interlocked with the transmission.
A first gear and a second gear provided between the operation input shaft and the rotation shaft; an intermediate shaft provided with a third gear meshing with the first gear of the operation input shaft; , And the switching operation body is further provided with an operating member for controlling connection / disconnection of the rotation shaft with the second and fourth gears.

According to the third aspect, the transmission loss of the operating force of the operating member to the transmission can be reduced, and the transmission efficiency of the operating force can be improved.

A fourth aspect of the invention is directed to an agricultural work machine, wherein the first and second gears are unequal speed ratio gears.

According to the fourth aspect of the present invention, the rotation speed of the rotating shaft interlocked with the operating member can be reduced and transmitted to the operating input shaft by the first and second gears. Since the amount of rotation of the operation input shaft with respect to the amount of operation can be reduced, it is possible to easily perform a detailed shift operation in the low-speed range of the transmission.

The agricultural work machine according to a fifth aspect of the present invention is characterized in that the agricultural work machine is provided with return means for forcibly returning the operation member when the switching member is operated to the neutral position.

In the fifth aspect, the transmission operated by the operating member can be returned to the neutral point when the switching member is operated to the neutral position regardless of the operating position of the operating member. . Therefore, when the transmission is driven again, the transmission can always be driven from the neutral point, sudden start can be prevented, and safety can be improved.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a perspective view of a shift switching device of an agricultural work machine, FIG. 2 is a longitudinal sectional view of an operation member, FIG. 3 is a perspective view of a state in which the switching member is switched to a forward region, and FIG. FIG. 5 is a side view of the agricultural work machine, and FIG. 6 is a plan view of the agricultural work machine.

The agricultural working machine according to the embodiment shown in FIGS. 5 and 6 has an engine 101 mounted on a machine body 100 and a drive shaft of the engine 101 provided with a main shaft and a PTO shaft interlocked via a main clutch 102. Mission case 10
3, a pair of left and right running wheels 104, 104 interlocked with the rotation of the main shaft of the transmission case 103, a hitch 105 provided at the rear end of the body 100, and a support base 106 provided on the upper side of the transmission case 103. And left and right steering operation bodies 107a and 107b extending obliquely upward rearward from the support base 106 via receiving rods. The steering operation bodies 107a and 107b are connected to the steering operation bodies 107a and 107b through the cords 108. Clutch operating member 1 for operating the main clutch 102
09 and a walking type agricultural work machine equipped with a speed changeover device A for performing speed control by switching the speed change device 110 mounted in the transmission case 103 to a forward range and a reverse range.

The transmission case 103 is provided with a hydrostatic transmission (HST) that can move forward and backward with respect to the neutral point by operating the operation member 1 and that can continuously control the shift. A transmission device 110 is provided, and the operation input shaft 3 of the transmission device 110 is projected outside the transmission case 103, and the operation input shaft 3 is controlled to rotate through the cord 2 by operating the operation member 1. , So that the speed can be switched steplessly to a predetermined shift range.

The shift switching device A for an agricultural work machine according to the embodiment shown in FIG. 1 includes a switching member 4 for switching the transmission 110 between a forward range and a reverse range, an operating member 1 for controlling the speed of the transmission 110, The operation input shaft 3 is provided in conjunction with the transmission 110.

The switching member 4 protrudes from a rotating shaft 5 rotatably supported outside the transmission 110 and a side of the supporting shaft of the rotating shaft 5 in a direction intersecting the axial direction. An arm 50 interlocking with the operation member 1 through the transmission means 6 for transmitting the rotational force of the rotary shaft 5 to the operation input shaft 3 by switching between forward rotation and reverse rotation;
And a switching operation body 7 for operating the.

The rotating shaft 5 is urged in one direction by an urging spring 8, and operates the operating member 1 in one direction against the force of the urging spring 8 to pull the rope 2. By doing
By increasing the speed of the transmission 110 in the forward region and operating the operating member 1 in the other direction, the rotating shaft 5 is returned and rotated by the force of the urging spring 8, and the speed of the forward region of the transmission 110 is reduced. It is configured to be.

The transmission means 6 includes the operation input shaft 3 and first and second operation shafts provided between the operation input shaft 3 and the rotation shaft 5.
An intermediate shaft 60 provided with gears 61 and 62, a third gear 63 rotatably supported outside the transmission 110 and meshing with the first gear 61 of the operation input shaft 3; And fourth and fifth gears 64 and 65 provided between the rotation shafts 5.

Each of the first to fifth gears 61 to 65 is formed of a disk having teeth on the outer periphery, and a fitting hole is provided at the center of rotation, and each of the first to fifth gears 61 to 65 is integrated with a predetermined position of each shaft. It is rotatably fitted and supported.

The first to third gears 61, 62, 63 use unequal speed ratio gears. The first embodiment of the embodiment shown in FIG.
The third gears 61, 62, 63 have their rotation centers deviated from the center O of the disk, and have different radii from the rotation centers to the tooth tips. The first and third gears 61 and 63 are meshed with each other so as to obtain an unequal speed ratio rotation.

That is, the second gear 62 has a small-diameter tooth portion 62b.
Is meshed with the large-diameter tooth portion 61a of the first gear 61, so that the rotation of the second gear 62 is reduced and transmitted to the first gear 61. In addition, the third gear 63 has a medium-diameter tooth portion,
The third gear 63 is engaged with the medium-diameter portion of the first gear 61.
Is transmitted to the first gear with almost no reduction. The first to third gears 61, 62, 63
May be engaged with each other using an elliptical gear so as to obtain a non-uniform speed ratio rotation. Fourth and fifth gears 64, 6
5 is provided with a fitting hole at the center of the disk.

The second and fourth gears 62, 64 are provided with detent grooves 62a, 64a recessed radially outward from the fitting holes.
The rotary shaft 5 is further provided with a sliding groove 51 extending in the axial direction, and the sliding groove 51 is connected to the detent grooves 62a, 64a of the second gear 62 and the fourth gear 64. One of the second and fourth gears 62 and 64 is held by slidably holding a square rod-shaped operating member 66 provided with a pair of projections 66a and 66b for blocking and sliding the operating member 66. The rotary shaft 5 is rotated integrally with the rotary shaft 5, so that the transmission of the rotational force from the rotary shaft 5 to the other is interrupted.

In the embodiment, when the transmission 110 is switched to the forward movement range, the rotation of the rotating shaft 5 is transmitted to the operation input shaft 3 via the operating member 66, the second gear 62 and the first gear 61, and When the transmission 110 is switched to the reverse range,
The rotation of the rotating shaft 5 is transmitted to the operating member 66, the fourth and fifth gears 6.
4, 65, and transmitted to the operation input shaft 3 via the third gear 63 and the first gear 61.

One end of the operating member 66 has the rotating shaft 5
An annular body 67 provided with a through hole and an annular engaging groove 67a to be fitted into the annular body 67 is integrally provided, and the annular body 67 is slid by operation of the switching operation body 7.

The switching operation body 7 has a shaft 71 rotatably supported by the body 100, and projects radially outward from one end of the shaft 71 to engage with the engagement groove 67a. A gear piece 72, an operating portion 73 protruding radially outward from the other end of the shaft 71, and a cam 74.
The transmission piece 72 is moved up and down via the shaft body 71 by gripping and rotating the grip 3, and the operating member 66 is operated in conjunction with the transmission piece 72.

As shown in FIG. 2, the operating member 1 has a shaft 11 fixed to the right steering operating body 107b via a bracket 111, and a rotatably supported by the shaft 11, 2, an operation lever 13 provided with a cable receiving body 12 for receiving one end of the operation lever 13, the operation lever 13 and the bracket 1
A friction plate 14 interposed between the friction plates 11 to provide resistance to the rotation of the operation lever 13, a pressing spring 15 using a coil spring for pressing the operation lever 13 against the friction plate 14, and receiving the pressing spring 15 A spring support 16, an auxiliary lever 17 pivotally supported at an intermediate portion of the operation lever 13 and provided with a pressing piece 17 a abutting against the spring support 16, and the auxiliary lever 17 is compressed by the pressing spring 15. And a frictional force applying spring 18 for urging in the direction.

The operating position of the operating lever 13 is held by the force of the frictional force applying spring 18, and the auxiliary lever 17 is operated against the force of the frictional force applying spring 18, thereby rotating the operating lever 13. The resistance is reduced so that the operation lever 13 can be operated with a small force. The auxiliary lever 17 can be operated while holding the operation lever 13.

The cable receiving body 12 is formed in a disk shape, and one end of the cable-like body 2 is locked to an outer peripheral portion thereof. A cable winding groove around which the cable 2 is wound is provided on the outer peripheral surface of the cable receiver 12.

The cable-like body 2 is inserted into the outer cylinder 2a, which is supported in the middle of the right steering operation body 107b and an outer receiver 112 fixed to the body 100, and is inserted into the outer cylinder 2a. And an inner wire 2b which is locked to the cable receiving body 12 and the other end of which is locked to the arm 50. As the inner wire 2b, a push-pull wire in which bending is suppressed is used, and the operating force in one direction and the operating force in the other direction can be transmitted to the arm 50.

The switching operation body 7 and the arm 50
A return means 9 for forcibly returning the operating member 1 to the neutral position when the switching operating body 7 is operated to the neutral position is provided between the switching member 7 and the switching operation body 7.

The return means 9 is swingably supported by the body 100 and has a bell crank-shaped swing body 91 which engages with the cam body 74. One end of the swing means 91 is connected to the swing body 91 and the other end thereof. And a cord 92 connected to the end of the arm 50. The oscillating body 91 is urged by an urging spring 93 such that one end thereof enters the rotation range of the cam body 74. In addition, the cord-shaped body 92 is inserted into the outer cylinder 92a supported by the outer receivers 113 and 114 fixed to the body 100, and is inserted into the outer cylinder 92a. And an inner wire 92b whose other end is locked to the arm 50.

When the switching operation body 7 is operated on the forward or reverse side with respect to the neutral position,
Enters the rotation range of the cam body 74 and the switching operation body 7 is operated to the neutral position, the rocking body 91 is forcibly rocked by the high-order portion 74a of the cam body 74 to the position where it is retracted from the rotation range. The movement of the rocking body 91 is transmitted to the arm 50 via the cord-like body 92. This arm 50
With the rotation of, the rotation shaft 5 rotates, the operation input shaft 3 further rotates to the neutral point of the transmission 110 via the transmission means 6, and the operation lever 13 of the operation member 1 The rotation is returned to the neutral position against the force of the frictional force applying spring 18.

The left and right steering operating bodies 107a, 107
As shown in FIG. 6, b is divided into left and right sides from the other end of the receiving rod whose one end is supported by the support base 106, and the left steering operation body 107a has a grip portion gripped with the left hand at the end. Is provided at the end of the right steering operation body 107b. In the vicinity of the grip, the transmission case 1
The main clutch 1 for joining / cutting off the transmission of power to the main clutch 1
02 clutch operation lever 109 is reversibly supported between the on position and the off position.

The left and right steering operation bodies 107a, 107
In the vicinity of the grip portion b, side clutch levers 115, 115 that can be operated by hands holding the grip portion are provided, and a cord-like body (not shown) interlocked with the operation of each side clutch lever 115, 115. , The left and right side clutches (not shown) in the transmission case 103 can be individually turned on and off.

A working device 116 such as a rotary device is detachably supported on the hitch 105. In addition, one side of the transmission case 103 has the PT
A gear case 117 having a built-in power transmission mechanism interlocked with the rotation of the O-shaft is supported.
The input shaft in the tilling case 118 of the working device 116 is driven via a power transmission mechanism provided with a clutch.

The walking type agricultural working machine constructed as described above
The operation member 1 is located near the grip portion of the right steering operation body 107b.
, The grip portion of the left steering operation body 107a is gripped by the left hand, and the grip portion of the right steering operation body 107b is gripped by the right hand to perform the steering operation of the agricultural work machine. The operating lever 13 of the operating member 1 can be easily operated to the forward range or the reverse range with respect to the neutral position with the right hand holding the grip portion of the steering operation body 107b.

The operating lever 13 is provided with the frictional force applying spring 1.
The operation position is held by the force of FIG. When operating the operation lever 13, the auxiliary lever 17 is operated against the frictional force applying spring 18, and is operated such that the frictional force applying spring 18 does not act on the operation lever 13.

The operating force of the operating lever 13 is transmitted to the arm 50 of the switching member 4 via the cord 2,
And the rotating shaft 5 integrated therewith rotates. At this time, as shown in FIG. 3, when the switching operation body 7 of the switching member 4 is operated toward the forward region with respect to the neutral position, the protrusion 66a of the operating member 66 is provided.
Are joined with the detent groove 62a of the second gear 62,
Is transmitted to the operation input shaft 3 via the second and first gears 62 and 61, and the speed of the transmission 110 can be controlled by rotating the operation input shaft 3 by a predetermined angle.

In this case, the second gear 62 has a small diameter tooth portion 6.
2b is engaged with the large-diameter tooth portion 61a of the first gear 61 to reduce the rotation of the second gear 62 and transmit the rotation to the first gear 61. The amount of rotation of the shaft 3 can be reduced, and a detailed shift operation can be easily performed in the low-speed range of the transmission 110.

As shown in FIG. 4, when the switching member 7 of the switching member 4 is operated in the reverse region with respect to the neutral position, the projection 66b of the operating member 66 is turned into the detent groove of the fourth gear 64. 64a, and the rotation of the rotating shaft 5 is rotated by the fourth and fifth gears 64 and 65, the intermediate shaft 60, the third and first gears 6
The speed of the transmission 110 can be controlled by rotating the operation input shaft 3 by a predetermined angle by being transmitted to the operation input shaft 3 via 3, 61.

As described above, when the switching member 7 of the switching member 4 is operated in the forward or reverse range with respect to the neutral position, one end of the rocking member 91 of the return means 9 rotates the cam 74. Since the vehicle has entered the area, the operating force of the switching operation body 7 is not transmitted to the return means 9. Therefore, the operating member 1
Can be held by the force of the frictional force applying spring 18.

When the switching operation member 7 of the switching member 4 is operated to the neutral position, the high-order portion 74a of the cam body 74 comes into contact with one end of the rocking body 91, and the rocking body 91 operates to move the cable-like body. 92 is towed, and further through the arm 50, the rotating shaft 5
Rotates, the rotation of the rotating shaft 5 is transmitted to the operation input shaft 3 via the transmission means 6, and the operation input shaft 3 rotates to the neutral point of the transmission 110, and As a result, the operation lever 13 of the operation member 1 rotates to the neutral position against the force of the frictional force applying spring 18. Therefore, irrespective of the operating position of the operating member 1, when the switching member 4 is operated to the neutral position, the transmission 110 operated by the operating member 1 can always be returned to the neutral point. Therefore, when the transmission 110 is driven again, it can be driven from the neutral point without fail, sudden start can be prevented, and safety can be improved.

In the above-described embodiment, as means for switching the rotational force of the rotating shaft 5 between forward rotation and reverse rotation,
The detent groove 62 is formed in the fitting hole of the second and fourth gears 62 and 64.
a, 64a, and an operating member 66 provided with projections 66a, 66b joined to the detent grooves 62a, 64a.
Is supported on the rotating shaft 5, but the rotation preventing groove 62
Instead of a and 64a, a detent hole or projection is provided in the middle between the fitting holes of the second and fourth gears 62 and 64 and the teeth, and can be connected to these holes or projections. It is good also as a structure which provided the projection part etc. in the said operation member 66, and the structure is not specifically limited.

In the above embodiment, when the switching member 4 is operated to the neutral position by using the cord 2 provided with the push-pull wire, the operating member 1 is forcibly returned to the neutral position. However, in addition, a control device using a cord-like body 2 having a pull wire, further using a sensor that is turned on when the switching operation body 7 is operated to a neutral position, and a microprocessor to which the sensor is connected And an electromagnetic solenoid connected to the control device and arranged near the operating member 1 to operate the electromagnetic solenoid in accordance with the ON operation of the sensor.
May be rotated back to the neutral position against the frictional force applying spring 18.

[0051]

According to the agricultural work machine of the first invention, the switching member is disposed near the transmission and the switching member is operated via the cord by operating the operating member. It can be arranged at a position remote from the transmission.
By operating the operating member in a state where the switching member is switched to the forward position or the reverse position with respect to the neutral position,
The speed in the forward area and the reverse area can be controlled. Therefore, by mounting the operation member near the steering operation body of the agricultural work machine, the operation member can be easily operated from the position where the steering operation body is gripped, and the steering operation at the time of the speed control is stabilized. It can be done sexually.

Further, since the speed control is performed by operating the switching member by the operating force of the operating member, it is possible to transmit the operating force of the operating member to the switching member via a single cord. The transmission loss of the operation force by the cord-like body can be reduced, the operability of speed control can be improved, and the structure can be simplified, and the cost can be reduced.

According to the agricultural working machine of the second aspect, the operating force of the operating member is converted into the rotating force via the arm and the rotating shaft, and the rotating force is transmitted to the transmission via the transmitting means. Therefore, the operation force of the operation member can be smoothly transmitted to the transmission, and the speed change operation can be easily performed with a small operation force.

According to the third aspect of the present invention, the transmission loss of the operation force of the operation member to the transmission can be reduced, and the transmission efficiency of the operation force can be improved.

According to the agricultural working machine of the fourth aspect, the rotation speed of the rotating shaft linked to the operating member can be reduced and transmitted to the operating input shaft by the first and second gears.
In other words, the amount of rotation of the operation input shaft with respect to the amount of operation of the operation member can be reduced, so that it is possible to easily perform a fine shift operation in the low speed range of the transmission.

According to the fifth aspect of the present invention, the transmission operated by the operating member is always returned to the neutral point when the switching member is operated to the neutral position regardless of the operating position of the operating member. Can be. Therefore, when the transmission is driven again, the transmission can always be driven from the neutral point, sudden start can be prevented, and safety can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a shift switching device for an agricultural work machine according to the present invention.

FIG. 2 is a longitudinal sectional view of an operation member of the agricultural working machine according to the present invention.

FIG. 3 is a perspective view showing a state where a switching member of the agricultural working machine according to the present invention has been switched to a forward movement region side.

FIG. 4 is a perspective view showing a state in which a switching member of the agricultural working machine according to the present invention is switched to a reverse region.

FIG. 5 is a side view of the agricultural working machine according to the present invention.

FIG. 6 is a plan view of the agricultural working machine according to the present invention.

FIG. 7 is a side view of a conventional agricultural working machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operation member 2 Cord 3 Operation input shaft 4 Switching member 5 Rotation shaft 50 Arm 6 Transmission means 60 Intermediate shaft 61 First gear 62 Second gear 63 Third gear 64 Fourth gear 65 Fifth gear 7 Switching operation body 9 Return means

Claims (5)

[Claims] 1. An agricultural work machine having a speed change device for performing speed control by switching a speed change device between a forward speed range and a reverse speed range, wherein the speed change device is disposed near the speed change device, and An agricultural working machine comprising: a switching member for switching to a reverse region; and an operating member for operating the switching member via a cord to control the speed of a transmission. 2. The switching member protrudes from a rotatable rotation shaft and a side intersecting with the axial length direction of the rotation shaft, and an arm interlocked with the operation member, and a rotational force of the rotation shaft for forward rotation and rotation. The agricultural work machine according to claim 1, further comprising: a transmission unit that switches to reverse rotation and transmits the transmission to the transmission, and a switching operation body that switches the transmission unit. 3. The transmission means includes: a rotatable operation input shaft interlocked with the transmission; first and second gears provided between the operation input shaft and the rotation shaft; An intermediate shaft provided with a third gear meshing with the first gear;
Fourth and fifth gears are provided between the intermediate shaft and the rotation shaft, and the switching operation body further includes an operating member for controlling connection / disconnection between the rotation shaft and the second and fourth gears. 3. The agricultural working machine according to claim 2, wherein: 4. The agricultural work machine according to claim 3, wherein the first to third gears are unequal speed ratio gears. 5. The agricultural working machine according to claim 2, further comprising a return unit for forcibly returning the operation member when the switching operation body is operated to the neutral position.