JP5313975B2 - Switching operation device - Google Patents

Description

  The present invention provides a first operation member that is manually operated to operate a first operation object, a second operation member that operates a second operation object, the first operation member, and the second operation member. An engagement linkage member that can be switched between a linkage state in which the operation member is linked and a linkage release state in which the linkage linkage is released, and a manually operated switching operation linked to the engagement linkage member via the linkage member The present invention relates to a switching operation device provided with a tool.

  In the switching operation device having the above-described configuration, the state in which the second operation member is operated in conjunction with the operation of the first operation member in conjunction with the operation of the first operation member is switched by switching the engagement link member between the link state and the link release state. The switching operation device can be switched to the state to be released. However, as an example of applying such a switching operation device to a traveling transmission device of a work vehicle, there is a conventional one described in Patent Document 1, for example. It was.

  That is, a positioning rocking body as a first operating member that is operated in accordance with a speed change operation by an artificial operation of a continuously driving transmission for driving driving as a first operation target, and an accelerator device of an engine as a second operation target. An accelerator-linked operation member as a second operation member for operation is supported on the same spindle so as to be swingable, and the accelerator-linked operation member is slidably supported on the spindle. Then, when the accelerator interlocking operation member is slid so as to approach the positioning oscillator, the interlocking pin as the engagement interlocking member provided in the accelerator interlocking operation member enters the pin hole provided in the positioning oscillator, and the linkage state is reached. When the interlocking pin is removed from the pin hole, it is configured to switch to the linkage release state.

  In other words, the accelerator interlocking operation member is moved and urged by a spring so as to be separated from the positioning rocking body and be in the disengagement state, and the interlocking operation tool is operated against the urging force of the spring. Along with the manual operation of the on / off lever, it is pulled by the operation cable as the interlocking member and pushed by the interlockingly linked roller so that the accelerator interlocking operating member moves in the direction of the axis of the support shaft. And is switched to the linked state.

JP 2007-331478 A (paragraphs [0030] to [0034], FIGS. 6, 7, 11, 12)

  In the above conventional configuration, by switching the engagement link member (link pin) to the link state, it is possible to appropriately switch to the state in which the second operation member is operated in conjunction with the manual operation of the first operation member. However, an engagement linking member is provided on the second operating member, and the second operating member is slidably supported with respect to the support shaft, and the second operating member is supported by the operation of the interlocking on / off lever. Since it is configured to slide on the shaft, there is a disadvantage that the operation structure for switching the engagement linking member between the linkage state and the linkage release state becomes large and requires a large space.

  In addition, in order to allow the second operating member to slide satisfactorily in a state where it does not bend, etc., a highly wear-resistant member is used for the sliding portion of the second operating member, or a surface with high wear resistance. It is necessary to perform processing, and it is necessary to use an expensive ball bearing to ensure durability for the roller that pushes the second operation member. However, there is a disadvantage that the operation structure for switching between the two is complicated and the cost is increased.

  It is an object of the present invention to switch the engagement link member to the link state and release the link while appropriately switching to the state in which the second operation member is operated in conjunction with the manual operation of the first operation member. An object of the present invention is to provide a switching operation device that can be compactly provided with an operation structure for switching to a state and can be reduced in cost by simplifying the structure.

A switching operation device according to the present invention includes a first operation member that is manually operated to operate a first operation object, a second operation member that operates a second operation object, and the first operation. An engagement linkage member that can be switched between a linkage state in which the member and the second operation member are linked and a linkage release state in which the linkage linkage is released; and an artifact linked to the engagement linkage member via the linkage member An operation type switching operation tool is provided, and the first characteristic configuration thereof is:
The first operating member is supported by the frame so as to be rotatable around the first axis;
The second operating member is supported by the frame so as to be rotatable around a second axis;
The engagement linking member is supported by the second operation member so as to be rotatable around a third axis parallel to the second axis, and contacts the first operation member as the rotation occurs. The interlocking action position corresponding to the linkage state in which the second operation member is rotated in conjunction with the rotation of the first operation member, and the linkage release state in which the contact engagement is released. It is configured to change position over the corresponding non-acting position,
When the engagement linking member is in the interlocking action position, the connection location between the engagement linking member and the interlocking member is located on the second axis.

  According to the first characteristic configuration, when the first operation member is manually operated to operate the first operation target, the first operation member rotates around the first axis, and the second operation member operates the second operation target. Around the second axis. If the engagement link member is changed to the non-operation position, the second operation member will not be rotated in conjunction with the first operation member, but the engagement link member is the second. When it rotates around the third axis parallel to the axis and changes its position to the interlocking action position, the engagement linkage member comes into contact with and engages with the first operating member, and the first operating member rotates with the first operating member. 2 The operation members are rotated in conjunction with each other.

  In this way, by rotating the engagement linking member, the switching is performed between the linked state and the linked release state. Therefore, the switching operation can be smoothly performed in a state where there is no twist or the like. It is possible to appropriately switch to a state in which the second operation member is operated in conjunction with the manual operation of the member.

  Further, since the engagement linking member is supported by the second operation member so as to be rotatable around the third axis parallel to the second axis, the engagement linking member is moved along the second axis. It is possible to deploy in the vicinity of the operation member, and it is possible to achieve compactness in the direction along the second axis. Moreover, it is a simple structure in which the engagement linking member is rotatably supported and is rotated to switch between the linkage state and the linkage release state, and the engagement linkage member is switched between the linkage state and the linkage release state. It is possible to reduce the cost by simplifying the operation structure for switching to.

When the second operation member rotates in conjunction with the rotation of the first operation member, the engagement link member is in the link action position, so that the connection location between the engagement link member and the link member is the second. It will be located on the axis. The second operation member is rotatable around the second axis, and the engagement link member is supported by the second operation member, so that the engagement link member also rotates around the second axis. Become.
As a result, when the second operating member rotates in conjunction with the rotation of the first operating member, the position of the connection location between the engaging and linking member and the interlocking member does not change. The operation state of the switching operation tool does not change, and the interlocking operation can be performed satisfactorily.

  Therefore, the engagement link member is switched between the link state and the link release state while it is possible to appropriately switch to the state in which the second operation member is operated in conjunction with the manual operation of the first operation member. Therefore, it has become possible to provide a switching operation device that can be compactly provided with an operation structure for reducing the cost and can be reduced in cost by simplifying the structure.

  According to a second characteristic configuration of the present invention, in addition to the first characteristic configuration, the first operation member and the second operation are configured such that the first axis and the second axis are located on the same axis. The member is supported by the frame.

  According to the second feature configuration, since the first operating member and the second operating member are supported by the frame body so as to be rotatable around the same axis, the members for supporting them rotatably are shared. The number of parts can be reduced and the structure can be simplified.

  According to a third feature configuration of the present invention, in addition to the first feature configuration or the second feature configuration, when the engagement linkage member is repositioned from the non-action position to the interlock action position, The contact part to contact | abut is provided in the said 2nd operation member, The point which is provided with the urging | biasing means which presses and urges | biases the said engagement linkage member to the said contact part of the said 2nd operation member is provided. is there.

  According to the third feature configuration, when the engagement link member is moved from the non-operation position to the interlock operation position, the engagement link member contacts the contact portion provided in the second operation member. After switching to the operating position, the relative positional relationship between the engagement linking member and the second operating member is the same, and the connection location between the engagement linking member and the interlocking member is located on the second axis. Will be maintained.

  In addition, since the engagement linking member is pressed and urged by the urging means so as to press against the abutment portion, the engagement linking member is engaged in a state in which no rattling occurs between the engagement linking member and the second operation member. The state where the connection portion between the linkage member and the interlocking member is located on the second axis is maintained, and the second operation member can be favorably interlocked with the artificial operation of the first operation member.

According to a fourth feature configuration of the present invention, in addition to any one of the first feature configuration to the third feature configuration, the first operation member is used for a speed change operation of a continuously driving transmission for driving driving as the first operation target. It is a shift interlocking operation member that is operated along with it,
The second operation member is an accelerator interlocking operation member for operating an accelerator device of an engine as the second operation object;
When the engagement linking member is in the interlocking action position, the accelerator device is interlocked to the high output side as the continuously variable transmission is shifted to the speed increasing side, and the engagement linking member is In the non-operating position, the accelerator device is not operated regardless of the speed change operation of the continuously variable transmission.

  According to the fourth feature configuration, when the interlocking linkage member is in the interlocking action position, the shift interlocking operation member and the accelerator interlocking operation member are in an interlockingly interlocking state, and as the continuously variable transmission is shifted to the speed increasing side, The accelerator device is operated in conjunction with the high output side. On the other hand, when the engagement linking member is in the non-operating position, the interlocking state between the shift interlocking operation member and the accelerator interlocking operation member is released, and the accelerator device is not operated regardless of the shifting operation of the continuously variable transmission.

  Accordingly, the accelerator device is operated in conjunction with the speed change operation of the continuously variable transmission for driving, and a state where it is possible to travel at a high speed or at a low speed while suppressing fuel consumption, Regardless of the speed change operation of the continuously variable transmission, the accelerator device can be switched to a state where the speed device is maintained in a preset speed state, and a switching operation device that can be suitably used for a work vehicle or the like can be provided.

It is a side view of the whole tractor. It is a block diagram which shows a transmission state. It is a vertical side view in a main transmission arrangement part. It is a cross-sectional top view in a main transmission arrangement | positioning part. It is a control block diagram. It is a side view of a positioning mechanism. It is a partially cutaway top view of a switching operation mechanism. It is a disassembled perspective view of a switching operation mechanism. It is a top view of an interlocking on / off lever arrangement part. It is a vertical side view of an interlocking on / off lever arrangement part. It is a disassembled perspective view of an interlocking on / off lever arrangement | positioning part. It is explanatory drawing which shows the switching operation state of a switching operation mechanism. It is explanatory drawing which shows the switching operation state of a switching operation mechanism. It is explanatory drawing which shows the switching operation state of a switching operation mechanism. It is explanatory drawing which shows the switching operation state of a switching operation mechanism. It is explanatory drawing which shows the switching state of an interlocking on / off lever. It is explanatory drawing which shows the switching state of an interlocking on / off lever. It is a principal part side view of the switching operation mechanism of another embodiment. It is a control block diagram of another embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A case where the present invention is applied to a tractor as an example of a work vehicle will be described as an example. FIG. 1 is an overall side view of the tractor. As shown in this figure, the tractor includes a vehicle body frame 4 having a clutch housing 4A connected to the rear portion of the engine 1, and a pair of left and right provided at the front portion of the vehicle body frame 4 so as to be steerable and drivable. Front wheels 3, 3, a pair of left and right rear wheels 5, 5 movably provided at the rear of the body frame 4, a driver seat 7 positioned above the rear end of the body frame 4, and in front of the driver seat 7 A driving portion 8 having a steering wheel 6 positioned, a pair of left and right lift arms 18 and 18 provided at the rear end portion of the vehicle body frame 4 so as to be vertically driven and swingable, and the rear end portion of the vehicle body frame 4 from the rear of the vehicle body A power take-out shaft 15 protruding in the direction is provided.

  The vehicle body frame 4 includes the engine 1 and the clutch housing 4A, a front frame 2 connected to the lower portion of the engine 1, a transmission case 4B connected to the rear portion of the clutch housing 4A, and a rear end of the transmission case 4B. And a rear mission case 4C connected to the side. The front frame 2 supports a pair of left and right front wheels 3 and 3. The rear transmission case 4C supports a pair of left and right rear wheels 5 and 5 and includes a pair of left and right lift arms 18 and 18 and a power take-out shaft 15.

  This tractor connects a rotary tiller (not shown) to the rear part of the vehicle body so as to be moved up and down by a pair of left and right lift arms 18 and 18 and transmits the driving force of the engine 1 from the power take-out shaft 15 to the rotary tiller. Various riding devices are configured by connecting various working devices to the rear part of the vehicle body so as to be lifted and driven freely, such as a riding type tiller.

  FIG. 2 is a configuration diagram illustrating a transmission state of a traveling transmission device included in the tractor. As shown in this figure, the traveling transmission device includes a main clutch 9 provided in the clutch housing 4A and a hydrostatic continuously variable transmission (hereinafter abbreviated as a continuously variable transmission) provided in the transmission case 4B. ) (Example of first operation target) 10, the auxiliary transmission 11 and the rear wheel differential mechanism 13 provided in the rear transmission case 4C, the front wheel output gear 11a of the auxiliary transmission 11, the clutch gear 11b, and the front wheel transmission shaft 11c The front-wheel differential mechanism 12 interlock | cooperated via is provided.

  The main clutch 9 transmits the driving force from the engine 1 to the input shaft 16 a of the continuously variable transmission 10. The continuously variable transmission 10 shifts the driving force input by the input shaft 16a and outputs the shifted driving force from the output shaft 17a to the auxiliary transmission 11. The sub-transmission device 11 shifts the driving force from the continuously variable transmission 10 in three stages, high speed, medium speed, and low speed, by shifting the shift gear 11d, thereby changing the rear wheel differential mechanism 13 and the front wheel differential. Output to mechanism 12.

FIG. 3 is a vertical side view of a portion where the main clutch 9 and the continuously variable transmission 10 of the traveling transmission device are located. FIG. 4 is a cross-sectional plan view of the continuously variable transmission 10. As shown in these drawings, the continuously variable transmission 10 is driven by an axial plunger type variable displacement hydraulic pump 16 having an input shaft 16a as a pump shaft, and pressure oil from the hydraulic pump 16. An axial plunger type hydraulic motor 17 is provided.
That is, the continuously variable transmission 10 converts the driving force transmitted from the engine 1 to the input shaft 16a into the forward driving force and the backward driving force by changing the angle of the swash plate 16b of the hydraulic pump 16. In addition, the forward drive force and the reverse drive force are shifted steplessly and output from the output shaft 17a formed of the motor shaft of the hydraulic motor 17, and the left and right rear wheels 5 are connected via the auxiliary transmission 11 and the rear wheel differential mechanism 13. , 5, and the left and right front wheels 3, 3 are driven via the auxiliary transmission 11 and the front wheel differential mechanism 12.

  As shown in FIG. 2, the work transmission device included in the tractor is configured so that the driving force of the input shaft 16 a of the continuously variable transmission 10 (pump shaft of the hydraulic pump 16) is applied to the power take-out shaft 15 via the work clutch 14. introduce.

  FIG. 5 is a control block diagram of the traveling operation device provided in the tractor. As shown in this figure, the hydraulic speed change cylinder 26 (hereinafter referred to as speed change cylinder 26) for shifting the continuously variable transmission 10, the servo control mechanism 20 for controlling the speed change cylinder 26, and the operation of the servo control mechanism 20 are controlled. A continuously variable transmission based on an angle of a control sensor 21, a pedal sensor 27 including a potentiometer for detecting an operation position of a shift pedal 24 as an example of a shift operation tool provided in the operation unit 8, and an angle of a swash plate 16 b of the hydraulic pump 16. And a swash plate sensor 34 for detecting ten shift states.

  Further, a switching operation mechanism 50 that can be switched between an interlocking state in which the shift pedal 24 and the operation unit 40a of the accelerator device 40 are interlocked and a interlocking off state in which the interlock is released, and a portion below the steering wheel 6 in the driving unit 8 are provided. An interlocking on / off lever 43 as an example of a switching operation tool provided at the rear of the driving operation panel in a positioned state and switching the switching operation mechanism 50 between the on state and the off state is provided. The switching operation mechanism 50 will be described in detail later.

  As shown in FIG. 4, the speed change cylinder 26 is installed inside the transmission case 4B, and the swash plate 16b of the hydraulic pump 16 is rotated via the interlocking pin 26a to the cylinder block 16c of the swash plate 16b. By changing the angle, the continuously variable transmission 10 is shifted. As shown in FIG. 5, the servo control mechanism 20 includes a forward proportional control valve 31 and a reverse proportional control valve 32, and the forward proportional control valve 31 and the reverse proportional control valve 32 are switched by a command from the control means 21. Then, the speed change cylinder 26 is operated so that the continuously variable transmission 10 is in a speed change state corresponding to the operation position of the speed change pedal 24. As shown in FIG. 4, the servo control mechanism 20 is attached to the transmission case 4B.

  The control means 21 is configured by using a microcomputer, and detection information by the pedal sensor 27 and detection information by the swash plate sensor 34 that detects the shift state of the continuously variable transmission 10 based on the angle of the swash plate 16b. Based on the above, the operation of the speed change cylinder 26 is controlled via the servo control mechanism 20 so that the continuously variable transmission 10 enters a speed change state corresponding to the operation position of the speed change pedal 24.

As shown in FIG. 6, when the speed change pedal 24 is stepped on from the neutral state to the front side of the vehicle body by the front operation portion 24a, the control means 21 operates the speed change cylinder 26 to the forward side and the continuously variable transmission 10 is moved to the forward side. A speed change operation is performed, and the tractor travels forward. When the speed change pedal 24 is depressed from the neutral state to the rear side of the vehicle body by the rear operation portion 24b, the control means 21 operates the speed change cylinder 26 to the reverse side, and the continuously variable transmission 10 is changed to the reverse side. The tractor travels backward.
In both forward travel and reverse travel, as the depressing stroke of the speed change pedal 24 is increased, the control means 21 operates the speed change cylinder 26 to the higher speed side to change the continuously variable transmission 10 to the higher speed side. The traveling speed of the tractor increases.

  A positioning mechanism 70 is provided for positioning the shift pedal 24 in a neutral state and returning the shift pedal 24 to a neutral state regardless of whether the shift pedal 24 is stepped on either the forward side or the reverse side. The configuration of the positioning mechanism 70 will be described.

As shown in FIGS. 6 to 8, the positioning mechanism 70 is for a cam whose one end is supported by a spring receiver 72 provided in a base body 71 (an example of a frame body) fixed to the lower surface side of the floor plate 8 a of the operation unit 8. Coil spring 73, a rotating member 75 rotatably supported by a boss portion 75a on a support shaft 71a provided on the base body 71, and an end portion of an arm portion 75b of the rotating member 75 as a rear end portion of the transmission pedal 24. An interlocking rod 76 connected to the connecting piece 24c positioned, a shift interlocking operating member 78 (an example of a first operating member) rotatably supported by a boss 78a on a support shaft 71b of the base body 71, and A cam mechanism 79 provided between the speed change interlocking operation member 78 and the rotating member 75 is provided.
That is, the shift interlocking operation member 78 is supported by the base body 71 so as to be rotatable around the axis X1 of the support shaft 71b.

  The speed change interlocking operation member 78 includes a base end portion 78A fixed to the boss portion 78a and an extending portion 78B extending in a substantially U shape in plan view so as to get over the vertical surface portion 71A of the base body 71. The other end side of the coil spring 73 is supported by a locking pin 80 fixed to the base side portion 78A.

  The cam mechanism 79 includes a V-shaped inclined cam surface 79 a provided on the cam plate portion 75 c of the rotating member 75 and a rotating cam follower 79 b provided by rotatably supporting a roller on the base end portion of the speed change interlocking operation member 78. It is constituted by. The cam coil spring 73 swings and biases the speed change interlocking operation member 78, thereby biasing and biasing the cam follower 79b against the inclined cam surface 79a.

  That is, regardless of whether the shift pedal 24 is depressed from the neutral state to either the forward side or the reverse side, the rotating member 75 rotates around the axis X1 of the support shaft 71 in conjunction with the swinging of the shift pedal 24. Then, due to the action of the cam mechanism 79, the transmission interlocking operation member 78 rotates around the axis X1 of the support shaft 71b in the left direction in FIG. When the depressing operation of the speed change pedal 24 is released, the cam follower 79b is pressed against the inclined cam surface 79a by the biasing force of the cam coil spring 73, so that the rotating member 75 is rotated to return to the initial position. Become. Accordingly, the positioning mechanism 70 positions the shift pedal 24 in a neutral state by the elastic restoring force of the coil spring 73 for the cam, and the shift pedal 24 is depressed regardless of whether the shift pedal 24 is depressed forward or backward. Return to the neutral state.

  In this tractor, when the vehicle is traveling, for example, when traveling on the road, if the interlocking on / off lever 43 provided in the driving unit 8 is switched to the on position, the switching operation mechanism 50 enters the on state, and the speed change When the pedal 24 and the accelerator device 40 are interlocked with each other and the shift pedal 24 is depressed, the accelerator device 40 operates on the speed increasing side in conjunction with this operation, and the rotational speed of the engine 1 increases. That is, as the depression stroke of the speed change pedal 24 is increased and the change in the continuously variable transmission 10 toward the high speed side increases, the accelerator device 40 operates at a higher speed side and the engine speed increases. When the shift pedal 24 is operated to the low speed side, the accelerator device 40 is operated to the low speed side in conjunction with this operation. As a result, when the vehicle travels at a low speed, the rotational speed of the engine 1 decreases and the fuel consumption decreases.

  On the other hand, when working, if the interlocking on / off lever 43 is switched to the cutting position, the switching operation mechanism 50 is turned off, the interlocking between the shift pedal 24 and the accelerator device 40 is cut off, and the gear shifting is performed. Whether the pedal 24 is depressed or returned to the low speed side, the accelerator device 40 maintains the speed state set by the accelerator lever 25.

  The operation linkage mechanism of the accelerator device 40 will be described. As shown in FIG. 5, the accelerator lever 25 is supported so as to be swingable around the axis P and to be held at an arbitrary operation position by the friction holding mechanism 28. The lever-side operation member 35 linked to the accelerator lever 25 via the operation wire 29 and the operation tool 40a of the accelerator device 40 are interlocked by the engagement of the long hole 35a and the pin 40b. Further, the pedal side operation member 41 operated in conjunction with the speed change pedal 24 via the operation wire 53 and the operation tool 40a of the accelerator device 40 are interlocked by the engagement of the long hole 41a and the pin 40c. Yes.

  When the accelerator lever 25 is operated from the lowest speed command position to the highest speed command position, the operation tool 40a of the accelerator device 40 is changed from the lowest speed position to the highest speed position in conjunction with the lever side operation member 35. At this time, if the pedal-side operation member 41 is at the lowest speed command position, the movement of the operation tool 40a of the accelerator device 40 is permitted by the accommodation through the long hole 41a.

  When the accelerator lever 25 is operated to be held at an arbitrary operation position, the position is set by the accelerator lever 25 when the switching operation mechanism 50 is in the on state and the shift pedal 24 is depressed. With the accelerator operating position as the lower limit value, the pedal side operation member 41 is operated to the high speed side in conjunction with the operation of the shift pedal 24, and the operating tool 40a of the accelerator device 40 is moved to the high speed side from the lower limit value. It has a possible configuration.

Next, the switching operation mechanism 50 will be described.
The switching operation mechanism 50 includes a positioning mechanism 70, a shift interlocking operation member 78, an accelerator interlocking operation member 51 supported on a support shaft 71b by a boss portion 51a so as to be swingable, and an accelerator interlocking operation member 51. A moving operation body 52 that can be switched between a linked state in which the operating member 78 is linked and linked and a linked release state in which the linked link is released is provided.

  The accelerator interlocking operation member 51 is configured to be supported by the base body 71 so as to be rotatable around the axis X1 of the support shaft 71b. In this embodiment, the shift interlocking operation member 78 is freely rotatable. The first axis when supported by 71 and the second axis when the accelerator interlocking operation member 51 is rotatably supported by the base body 71 are the same axis X1 (the axis of the support shaft 71b). The shift interlocking operation member 78 and the accelerator interlocking operation member 51 are supported by the base body 71 in a form located on the core.

  As shown in FIGS. 6 to 8, the accelerator interlocking operation member 51 has an operation wire 53 that is interlocked with the operation portion 40 a of the accelerator device 40 at one end portion 51 b located below the support shaft 71 b. Are connected to each other, and a tension spring 55 is stretched between an end 51c on the other side located above the support shaft 71b of the accelerator interlocking operation member 51 and a spring receiver 54 provided on the base body 71. It is.

As shown in FIG. 8, the moving operation body 52 is rotatably supported by the accelerator interlocking operation member 51 around the third axis X2 parallel to the axis X1 (first axis and second axis). ing. That is, the support shaft 56 provided in the moving operation body 52 is rotatably supported by the boss portion 51 a provided in the accelerator interlocking operation member 51.
The moving operation body 52 includes a supporting shaft 56 and a plate-like rotation provided with three arm portions 52b extending radially outward in three directions at intervals in the circumferential direction from the place where the supporting shaft 56 is disposed. 52 A of moving parts and the engagement pin 52B as an engaging action part provided in the state which protrudes along the rotating shaft center direction in the front end side location of one arm part 52b of plate-shaped rotation part 52A are provided. Yes.

  The other end portion of the operation wire 59 as an interlocking member whose one end portion is interlocked with the interlocking on / off lever 43 is connected to the tip side portion of the other arm portion 52b of the plate-like rotation portion 52A. A position-holding tension spring 61 as a position-holding urging means is provided across the tip side portion of the remaining one arm portion 52b of the plate-like rotating portion 52A and the spring receiver 60 fixed to the accelerator interlocking operation member 51. It is stretched.

  12 and 13 are side views when the moving operation body 52 is in a non-acting position corresponding to the disengagement state (cut-off state), and FIGS. 14 and 15 show the movement operation body 52 in the associated state (entering). It is a side view when it exists in the interlocking action position corresponding to (state). FIG. 16 is a diagram illustrating switching from the linkage release state (cut-off state) to the linkage state (turn-on state). The operation of the moving operation body 52 will be described below with reference to FIGS.

  The moving operation body 52 is rotationally biased toward the non-acting position (see FIGS. 12, 13, and 16A) by the biasing force of the tension spring 61 for holding the position. When the lever 43 is operated to the cutting position OFF, the moving operation body 52 is held at the non-operating position.

  As shown in FIG. 12, when the moving operation body 52 is in the non-operating position, the shift pedal 24 is depressed from the neutral state to either the forward side or the reverse side, and the shift interlocking operation member 78 is moved to the support shaft 71b. Even if it rotates around the axis X1, the engaging pin 52B does not engage with the shift interlocking operation member 78, so that the accelerator interlocking operation member 51 is not operated in conjunction (see FIG. 13).

  As shown in FIG. 14, when the interlocking on / off lever 43 is operated to the on position ON, as shown in FIGS. , The engaging pin 52B comes into contact with and engages with the contact portion 63 of the accelerator interlocking operation member 51, and further turning operation is restricted. In this state, when the shift interlocking operation member 78 rotates as the shift pedal 24 is depressed, the inner edge of the engagement recess 64 formed in the extending portion 78B of the shift interlocking operation member 78 becomes the engagement pin 52B. The engagement pins 52B are configured to contact and rotate in conjunction with each other. That is, the position of the moving operation body 52 at this time corresponds to the interlocking action position.

  Then, when the inner edge of the engagement recess 64 of the speed change interlocking operation member 78 abuts on the engagement pin 52B and rotates the engagement pin 52B in conjunction with the engagement pin 52B, the engagement pin 52B is brought into contact with the contact portion 63. Since the contact engagement is made, the accelerator interlocking operation member 51 rotates around the axis X1 of the support shaft 71b in conjunction with the urging force of the tension spring 55, and the operation wire 53 is pulled. The operating tool 40a of the accelerator device 40 is moved to the high speed side.

  Further, in a state where the engaging pin 52B is in contact with the contact portion 63 of the accelerator interlocking operation member 51 and further rotation operation is restricted, the connection point Q between the operation wire 59 and the plate-like rotation portion 52A. (Refer FIG. 7, FIG. 8) is comprised so that it may be located on the axis X1 of the spindle 71b (refer FIG. 14, FIG.16 (b), (c)). Even if the interlocking operation accompanying the rotation of the shift interlocking operation member 78 is performed, at that time, the accelerator interlocking operation member 51 and the moving operation body 52 rotate integrally around the axis X1 of the support shaft 71b. Thus, since the position of the connection point Q between the operation wire 59 and the plate-like rotation portion 52A does not change, the position of the operation wire 59 does not change.

  As shown in FIGS. 9 and 10, in the vicinity of the interlocking on / off lever 43, the moving operating body 52 and the operating wire 59 are interlocked and connected, and via the interlocking on / off lever 43 and the tension spring 65 on the lever side. A long relay operation member 66 is provided in an interlocked manner, and when the interlock on / off lever 43 is operated from the cut position OFF to the on position ON, the relay operation member is generated while tension is generated in the tension spring 65 on the lever side. 66 is moved, and the moving operation body 52 is configured to be operated from the non-action position to the interlocking action position.

  The relay operating member 66 is brought into contact with the interlocking on / off lever 43 in a state where the moving operation body 52 is prevented from moving from the non-operating position to the interlocking operating position. A contact restricting portion 67 for restricting the switching operation to the position ON is provided.

9 and 10, the stay 69 fixed to the handle post 68 that supports the steering wheel 6 is provided with an up and down lever support shaft 44, and the lever support shaft 44 includes The interlocking on / off lever 43 is supported so as to be swingable left and right around the axis. The interlocking on / off lever 43 is supported by the lever support shaft 44 in a state of providing flexibility so that it can be slightly moved in the vertical direction.
In addition, the lever support shaft 44 supports one end side portion of the relay operation member 66 in the longitudinal direction so as to be swingable around the shaft core while being aligned with the interlocking on / off lever 43 along the shaft core direction. .
The interlocking on / off lever 43 and the relay operating member 66 are pressed and urged by the compression spring 45 in the axial direction of the lever support shaft 44 and are held so as not to rattle.

  A lever-side tension spring 65 is stretched across the other end portion in the longitudinal direction of the relay operation member 66 and an intermediate portion in the longitudinal direction of the interlocking on / off lever 43. The lever-side tension spring 65 is configured to have a greater biasing force than the position-holding tension spring 61 that pivots and biases the moving operation body 52 to the non-operating position.

  The interlocking on / off lever 43 is operated along with the guide groove 46a (see FIGS. 9 and 11) of the lever guide 46 that is integrally extended from the stay 69 by operating the grip operating portion 43A by hand. Further, it is configured so that it can be swung in the left-right direction around the axis of the lever support shaft 44 over the cutting position OFF and the entering position ON.

  When the interlocking on / off lever 43 is operated from the cutting position OFF to the on position ON, the relay operation member 66 moves while tension is generated in the tension spring 65 on the lever side against the biasing force of the tension spring 61 for holding the position. Thus, the moving operation body 52 is operated from the non-operation position to the interlock operation position via the operation wire 59.

  The interlocking on / off lever 43 is formed with an abutting action portion 43B at the base end portion on the opposite side to the grip operation portion 43A so as to protrude in a substantially square shape in plan view. Further, as shown in FIGS. 9 and 10, the relay operating member 66 has an abutment restricting portion 67 at the upper side position where the interlocking on / off lever 43 is located so as to overlap with the interlocking on / off lever 43 in a side view. Are provided in a state of being fixed integrally.

  If the interlocking on / off lever 43 is in the cutting position OFF, as shown in FIG. 9, it is urged so as to abut against the end of the guide groove 46a by the urging force of the tension spring 65 on the lever side. When one end side (the left side in FIG. 9) of the restricting portion 67 contacts the interlocking on / off lever 43, the relay operation member 66 further approaches the interlocking on / off lever 43 by the biasing force of the tension spring 65 on the lever side. Thus, the rocking is prevented.

When the interlocking on / off lever 43 is swung from the cutting position OFF to the on position ON, the interlocking on / off lever 43 and the relay operation member 66 are almost integrated by the strong biasing force of the tension spring 65 on the lever side. Swing operation is performed. Then, the moving operation body 52 is rotated in the clockwise direction of FIG.
Then, when operated to a predetermined position close to the entry position ON, the engagement pin 52B of the moving operation body 52 comes into contact with the contact portion 63 of the accelerator interlocking operation member 51 as shown in FIG. Further turning operation is restricted.

When the interlock on / off lever 43 is further operated from the position shown in FIG. 16B to the on position ON, the lever-side tension spring 65 is slightly extended as shown in FIG. 16C. Thus, the engagement pin 52B is pressed against the contact portion 63, and the moving operation body 52 and the accelerator interlocking operation member 51 move while rotating integrally in a stable state without rattling. Become.
That is, the lever-side tension spring 65 corresponds to a biasing means that presses and biases the moving operation body 52 against the contact portion 63.

When the moving operation body 52 can be moved between the non-operating position and the interlocking action position without any restriction, as described above, the interlocking on / off lever 43 and the relay operation member 66 are operated. Are swung almost integrally.
However, for example, the moving operation body 52 is prevented from moving from the non-operating position to the interlocking operating position, that is, the pulling operation of the operating wire 59, for example, because the movement is hindered due to damage to the member or dust intrusion. In this state, even if the operator holds the grip operation part 43B of the interlocking on / off lever 43 with his / her hand and tries to swing from the cutting position OFF to the on position ON, the moving operation is performed during the operation. Cannot be done.

  That is, in a state where the movement of the moving operation body 52 is blocked for some reason, as shown in FIG. 17, even if the operator tries to operate the interlocking on / off lever 43 from the cutting position OFF to the entering position ON. In the middle of the operation, the contact acting part 43B contacts the contact restricting part 67 and the further operation of the interlocking on / off lever 43 to the ON position ON side cannot be performed. It can be recognized that it is in a state.

In the above-described configuration, when the speed change pedal 24 and the accelerator device 40 are interlocked, the interlocking on / off lever 43 is swung along the guide groove 46a to enter the position located on one end side of the guide groove 46a. Switch to position ON. By this switching operation, the moving operation body 52 is operated from the non-operating position to the interlocking operating position (see FIG. 14).
In this state, when the shift pedal 24 is operated, as shown in FIG. 16, the operating force of the shift pedal 24 causes the interlocking rod 76, the rotating member 75, the shift interlocking operation member 78, the moving operation body 52, and the accelerator interlocking operation member. 51, and transmitted to the operation unit 40a of the accelerator device 40 via the operation wire 53.

  In this case, the swinging direction of the shift pedal 24 is different and the rotation direction of the rotating member 75 is different when the shift pedal 24 is depressed forward and when it is depressed backward. However, regardless of whether the shift pedal 24 is stepped forward from the neutral state or stepped backward, the shift interlocking operation member 78 moves in the same direction from the initial position due to the action of the shape of the inclined cam surface 79a. By rotating, the accelerator interlocking operation member 51 is interlocked and rotated, and the operation wire 53 is pulled.

Accordingly, regardless of whether the shift pedal 24 is depressed forward or backward, the operation unit 40a of the accelerator device 40 is swung to the high speed side in conjunction with the depression of the shift pedal 24. 24 and the accelerator device 40 are interlocked.
Also, in this case, the interlocking on / off lever 43 is engaged with the notch 46b of the lever guide 46 so that the interlocking on / off lever 43 is maintained inside the notch 46a by the tension spring 65 on the lever side. The switching operation mechanism 50 can be held in the entering state by being held at the entering position ON.

  When the interlocking of the shift pedal 24 and the accelerator device 40 is cut, the interlocking on / off lever 43 is switched to the cutting position OFF located on the other end side of the guide groove 43a (see FIG. 12). Then, as shown in FIG. 13, even if the moving operation body 52 is operated to the non-acting position and the shift pedal 24 is depressed, the operating force of the shift pedal 24 is the interlocking rod 76, the rotating member 75, and the shift interlocking operation member. However, since the moving operation body 52 is not engaged with the shift interlocking operation member 78, the accelerator interlocking operation member 51 is not interlocked and the operating force is not transmitted to the operation unit 40a of the accelerator device 40.

[Another embodiment]
(1) In the above-described embodiment, the first axis that is the rotation axis of the speed-change interlocking operation member 78 as the first operation member and the rotation axis of the accelerator interlocking operation member 51 as the second operation member. Although what was comprised with the form which a 2nd axial center is located on the same axial center X1 was shown, you may comprise as follows.
For example, as shown in FIG. 18, the first axis X3 that is the rotation axis of the shift interlocking operation member 78 and the second axis X4 that is the rotation axis of the accelerator interlocking operation member 51 are different. The shift interlocking operation member 78 and the accelerator interlocking operation member 51 may be supported by the base body 71 so as to be positioned in parallel with each other.

(2) In the above embodiment, the accelerator lever 25 and the operation unit 40a of the accelerator device 40 are linked by the operation wire 29. However, as described below, the accelerator device 40 may be operated by an actuator. Good.
That is, as shown in FIG. 19, an electric actuator 90 for operating the accelerator device 40, an accelerator lever sensor 91 including a potentiometer for detecting the operation position of the accelerator lever 25, and a lever for detecting the operation position of the interlocking on / off lever 43 The position detection switch 92 is provided, and the control means 21 determines whether the switching operation mechanism 50 is in the on state or the off state based on information detected by the lever position detection switch 92, and the switching operation mechanism 50. Is determined to be in the cut-off state, the accelerator device 40 is located at the operation position of the accelerator lever 25 based on the detection information by the accelerator lever sensor 91 and the detection information by the accelerator sensor 93 that detects the operation state of the accelerator device 40. Accelerator actuator so that the engine 1 can be operated with the corresponding rotational speed. It is configured to operate over data 90.

  In this case, when it is determined that the switching operation mechanism 50 is in the on state, the operation of the accelerator actuator 90 based on the detection information by the accelerator lever sensor 91 and the accelerator sensor 93 is stopped, and the accelerator device by the shift pedal 24 is used. A configuration may be adopted in which the accelerator actuator 90 is switched to a state in which an operation by an external force can be performed so that 40 operations can be performed.

(3) In the above-described embodiment, the contact restricting portion 63 that contacts when the moving operation body 52 as the engagement linking member is changed from the non-operation position to the interlock operation position and restricts further rotation. However, the present invention is not limited to such a configuration, but when the interlocking on / off lever 43 is operated to the cutting position OFF, the position-maintaining coil spring 61 and the lever-side coil spring 65 are provided. Various configurations such as a configuration in which the urging forces are balanced and the moving operation body 52 is held in position can be employed.

(4) In the above embodiment, the shift interlocking operation member 78 operated in accordance with the shifting operation of the continuously variable transmission 10 for driving driving, and the accelerator interlocking operation member 51 for operating the accelerator device 40 of the engine 1 However, the present invention is not limited to such a configuration, and the present invention is not limited to such a configuration, for example, a two-wheel drive state and a four-wheel drive state. A switching mechanism for switching between states, a front-wheel accelerated turning state in which the front wheels are driven at a higher speed than the rear wheels during turning, and a normal turning state in which the front wheels and the rear wheels are driven at the same speed. It is applicable to various switching operation mechanisms such as a switching mechanism for switching the driving state of a work device, not limited to those used in such a transmission mechanism. Do Door can be.

(5) In the above-described embodiment, the stepping type shift pedal 24 is used as the shift operation tool for operating the shift interlocking operation member 78 as the first operation member. (Not shown) may be used.

(6) In the said embodiment, although the tractor was illustrated as a work vehicle, this invention is applicable not only to a tractor but other work vehicles, such as a lawn mower, for example.

  The present invention can be applied to a switching operation device used in a work vehicle such as a tractor or a lawn mower.

1 engine 10 continuously variable transmission (first operation target)
40 Accelerator (second operation target)
43 Interlocking on / off lever (switching operation tool)
51 Accelerator-operated operation member (second operation member)
52 Moving operation body (engagement link member)
59 Operation wire (interlocking member)
63 Contact part 65 Lever side coil spring (biasing means)
71 Frame 78 Shift interlocking operation member (first operation member)
X1, X3 1st axis X1, X4 2nd axis X2 3rd axis Q Connection point

Claims (4)

A first operation member that is manually operated to operate the first operation object; a second operation member that operates the second operation object; and the first operation member and the second operation member. An engagement linkage member that can be switched between a linkage state in which linkage linkage is performed and a linkage release state in which linkage linkage is released, and an artificially operated switching operation tool linked to the engagement linkage member via the linkage member are provided. A switching operation device,
The first operating member is supported by the frame so as to be rotatable around the first axis;
The second operating member is supported by the frame so as to be rotatable around a second axis;
The engagement linking member is supported by the second operation member so as to be rotatable around a third axis parallel to the second axis, and contacts the first operation member as the rotation occurs. The interlocking action position corresponding to the linkage state in which the second operation member is rotated in conjunction with the rotation of the first operation member, and the linkage release state in which the contact engagement is released. It is configured to change position over the corresponding non-acting position,
A switching operation device configured such that when the engagement linking member is in the interlocking operation position, a connection point between the engagement linking member and the interlocking member is positioned on the second axis.   2. The switching according to claim 1, wherein the first operating member and the second operating member are supported by the frame body in a form in which the first axial core and the second axial core are located on the same axial core. Operating device. The second operating member is provided with a contact portion that contacts the engagement link member when the engagement link member is moved from the non-operation position to the interlock operation position.
The traveling operation device for a work vehicle according to claim 1, further comprising a biasing unit that presses and biases the engagement linkage member so as to press the contact portion of the second operation member. The first operating member is a shift interlocking operating member that is operated in accordance with a shifting operation of a continuously driving transmission for driving as the first operation target;
The second operation member is an accelerator interlocking operation member for operating an accelerator device of an engine as the second operation object;
When the engagement linking member is in the interlocking action position, the accelerator device is interlocked to the high output side as the continuously variable transmission is shifted to the speed increasing side, and the engagement linking member is The switching operation device according to any one of claims 1 to 3, wherein the switching device is configured not to operate the accelerator device regardless of a speed change operation of the continuously variable transmission when in the non-operation position.

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