JP6025661B2 - Neutral position detector - Google Patents

Neutral position detector Download PDF

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JP6025661B2
JP6025661B2 JP2013115652A JP2013115652A JP6025661B2 JP 6025661 B2 JP6025661 B2 JP 6025661B2 JP 2013115652 A JP2013115652 A JP 2013115652A JP 2013115652 A JP2013115652 A JP 2013115652A JP 6025661 B2 JP6025661 B2 JP 6025661B2
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neutral
speed change
recess
pair
movement
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JP2014234847A (en
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亮 増田
亮 増田
中村 正
正 中村
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株式会社クボタ
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  The present invention relates to a neutral position detection device that detects a neutral state of a transmission or the like using a neutral position detection switch.

  A conventional neutral position detection device is described in Patent Document 1, for example. As shown in Patent Document 1, for example, in a tractor or the like, it is detected whether or not the transmission is in a neutral state, and the engine can be started when it is detected that the transmission is in a neutral state. is there. Therefore, the neutral position detection device detects the neutral state of the transmission. In the one described in Patent Document 1, a shift shaft (movable operation shaft in Patent Document 1) that is supported so as to be movable and rotatable along the axial direction, and a shift operation that is integrated with the shift shaft. And a speed change arm. A pair of engaging portions that are arranged adjacent to each other and are selectively engaged by the speed change arm by a movement operation along the axial direction of the speed change shaft, and a pair of engagement portions, respectively. And a pair of shifters that are moved to the shift position by a rotation operation of the shift shaft in a state where the shift arm is engaged with the engaging portion. Thus, the shifter is moved to the shift position by moving the shift shaft along the axial direction and further rotating it. Therefore, a first recess is formed in the transmission shaft, and a neutral position detection switch is provided in the first recess so that the detection unit can be inserted and removed, and the detection unit is inserted into the first recess by the neutral position detection switch. By detecting this and capturing the movement of the transmission shaft, it is detected that the transmission is in a neutral state.

Japanese Patent No. 3933384

  However, in the prior art, the neutral position detection switch detects that the detection unit is inserted in the first recess (“switch operation unit [13a] of Patent Document 1), so that the transmission is in the neutral state. In this case, it is desired that the detector is appropriately inserted into the desired position with respect to the first recess.For this reason, for example, a shim is interposed between the neutral position detection switch and its mounting location. Therefore, fine adjustment work such as adjusting the thickness of the shim is required, which has the disadvantage of increasing costs and labor.

  In view of the above circumstances, it has been desired to provide a neutral position detection device that can accurately detect a neutral position with a simple configuration.

A work vehicle according to the present invention includes a speed change shaft that is supported so as to freely move and rotate along the axial direction,
A transmission arm that is moved and operated integrally with the transmission shaft;
A pair of engaging portions arranged adjacent to each other and selectively engaged by the speed change arm by a movement operation along the axial direction of the speed change shaft;
A pair of shifters that are provided for each of the pair of engaging portions, and are moved to a shift position by a rotation operation of the transmission shaft in a state where the shift arm is engaged with the engagement portions; Is provided with
The transmission shaft is formed with a first recess in which a detection unit of the neutral position detection switch can be inserted and removed, and a second recess in which a positioning tool for holding the neutral position can be inserted and removed,
The neutral position detection switch is configured to detect that the detection unit is inserted into the first recess,
The second recess has an inclined surface with the positioning position at the lowest position,
The positioning tool is biased toward the axial center of the transmission shaft, and the positioning shaft is inserted into the second recess, whereby the positioning shaft is moved to a position where the positioning position faces the positioning tool. Energized to move,
When the shift arm is positioned at a neutral position where it is engaged with both of the pair of engaging portions, the detecting portion is inserted into the first recess, and the positioning tool is inserted into the second recess. Inserted ,
The length of the second recess along the axial direction is the same as the length of the first recess along the axial direction, or from the length of the first recess along the axial direction. is a set tare shall so also increases.

According to the present invention, when the speed change arm is positioned at the neutral position where it is engaged with both of the pair of engaging portions, the detecting portion is inserted into the first recess and the positioning tool is inserted into the second recess. Has been. In this case, for example, even if the insertion position of the detection unit with respect to the first recess is slightly deviated from the desired position, the positioning position is shifted to a position facing the positioning tool by the biasing of the positioning tool inserted into the second recess. The axis can be moved. Therefore, the insertion position of the detector with respect to the first recess can be adjusted to the desired position by the movement of the transmission shaft. This eliminates the need for fine adjustment work such as adjusting the thickness of the shim by interposing a shim between the neutral position detection switch and its mounting location, and with a simple configuration, The position can be detected with high accuracy.
Further, according to this configuration, when the length along the axial direction of the second recess is the same as the length along the axial direction of the first recess, the detection unit is located when the speed change arm is positioned at the neutral position. Is inserted into the axial end of the first recess, the speed change shaft is moved by the interaction between the positioning tool and the second recess, and the insertion position of the detection unit with respect to the first recess is adjusted to the desired position. Can do. In addition, when the length along the axial direction of the second recess is larger than the length along the axial direction of the first recess, the detection unit moves in the axial direction when the speed change arm is positioned at the neutral position. Even at a position slightly deviated from the first recess, the transmission shaft moves due to the interaction between the positioning tool and the second recess, and the detection unit is inserted into the first recess, and the insertion position is adjusted to the desired position. be able to. As a result, for example, a neutral position can be detected accurately without requiring a detailed adjustment operation such as interposing a shim between the neutral position detection switch and its mounting location and adjusting the thickness of the shim. It can be carried out.

  In the above-described configuration, it is preferable that the positioning tool has a contact surface that is inserted into the second recess to contact the inclined surface and guide and move the transmission shaft.

  According to this configuration, the abutment surface of the positioning portion abuts against the inclined surface of the second recess, so that the guide action by the surface contact can be exhibited, and the speed change shaft to the position where the positioning position faces the positioning tool. Can be appropriately moved.

  In the above configuration, when the speed change arm is engaged with one of the pair of engaging portions, the shifter is operated to move corresponding to the other engaging portion of the pair of shifters. It is preferable that a movement restricting mechanism for restricting is provided.

  According to this configuration, when the speed change shaft is moved in the axial direction and the speed change arm is engaged with one of the engagement portions, the shift restriction mechanism moves the shifter to the speed change position corresponding to the other engagement portion. The movement operation can be restricted. As a result, when the shift arm is disengaged from the neutral position where it overlaps with both of the pair of engaging portions to the position where it engages with one of the engaging portions, the shifter corresponding to the other engaging portion is erroneously It is possible to prevent the movement operation to the shift position. Therefore, when the shift position deviates from the neutral position, shifters corresponding to both of the pair of engaging portions are moved to the shift position, and a double meshing state occurs in which both shift gears in both shifters mesh. Can be prevented.

  In the above configuration, the movement restricting mechanism restricts the movement associated with the rotation operation of the transmission shaft with respect to the restricting body provided in each of the pair of shifters, thereby controlling the movement operation in each of the pair of shifters. And when the speed change arm is positioned at the neutral position, the movement of the speed change shaft with respect to the restricting body of the pair of shifters is restricted. It is preferable.

  According to this configuration, the movement operation of each of the pair of shifters is restricted by the movement restricting mechanism by restricting the movement associated with the rotation operation of the transmission shaft with respect to the restricting body provided on each of the pair of shifters. The When the speed change arm is positioned at the neutral position, the movement of the speed change shaft with the turning operation is restricted with respect to both restriction bodies of the pair of shifters. For this reason, when the speed change arm is positioned at the neutral position, even if an attempt is made to rotate the speed change shaft, both movement operations of the pair of shifters are restricted by the movement restriction mechanism. Movement is restricted and attempts to hold the transmission arm in the neutral position. Therefore, when the speed change arm is located at the neutral position, even if it is attempted to rotate the speed change shaft, the speed change arm can be prevented from moving to a position deviated from the neutral position, and the neutral position can be accurately detected. It can be carried out.

  In the above configuration, each of the pair of engaging portions is preferably formed in a concave shape that is open at a portion facing the speed change arm and engageable by movement of the speed change arm through the opening. .

  According to this configuration, both the pair of engaging portions are formed in a simple shape, and both the pair of concave engaging portions are arranged adjacent to each other, so that the speed change arm becomes both the pair of engaging portions. The neutral position which engages in overlap can be revealed. In addition, the shift arm moves along the axial direction of the speed change shaft, the speed change arm passes through the opening of the engagement portion, and engages with the engagement portion. Can move smoothly.

It is the whole tractor side view. It is a block diagram which shows an engine starting check apparatus. It is a perspective view which shows attachment of a detection switch and a position holding mechanism. It is sectional drawing which shows the speed change operation part at the time of a neutral position. It is explanatory drawing of the speed change operation part in a neutral position, (A) is sectional drawing which shows the periphery of a shifter, (B) is explanatory drawing which shows the operation path | route of a speed-change lever. It is explanatory drawing of the speed change operation part in the forward 1st speed position, (A) is sectional drawing which shows the periphery of a shifter, (B) is explanatory drawing which shows the operation path | route of a speed-change lever. It is explanatory drawing of the speed change operation part in the reverse 1st speed position, (A) is sectional drawing which shows the periphery of a shifter, (B) is explanatory drawing which shows the operation path | route of a speed change lever. It is explanatory drawing which showed the 1st recessed part and the 2nd recessed part in the same cross section virtually. It is explanatory drawing which shows typically the relationship between a 1st recessed part and a 2nd recessed part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, an agricultural tractor that is an example of a “work vehicle” is located at a pair of left and right steering and driving front wheels 11, a pair of left and right driving rear wheels 12, and a front end of a vehicle body. A self-propelled vehicle body provided with a driving section having an engine 13 and a driving section having a driving seat 14 located at the rear end of the vehicle body is provided. On the rear part of the transmission case 15 forming the rear part of the body frame of the self-propelled vehicle body, a pair of left and right lift arms 16 that connect various working devices such as a rotary tillage device so as to be movable up and down, and a rotation from the engine 13 are provided. A power take-out shaft 17 is provided for transmitting power to the working device connected to the lift arm 16.

  As shown in FIG. 4, the tractor includes a gear-type main transmission 18 for traveling inside a mission case 15. The main transmission 18 switches the rotational force transmitted from the engine 13 to the input shaft of the transmission case 15 between three forward speeds and one reverse speed, and the front wheels 11 and the rear wheels are connected via an auxiliary transmission (not shown). 12 is configured to transmit. In order to perform the speed change operation of the main transmission 18, as shown in FIG. 1, a single main speed change lever 20 is provided on the side of the vehicle body of the driver seat 14 in the driver, and the operator can By operating the main transmission lever 20, the main transmission 18 is operated to change speed.

  As shown in FIG. 2, the tractor includes a neutral position detection switch 22 that detects whether or not the main transmission 18 is in a neutral state, and the neutral position detection switch 22 neutralizes the main transmission 18. The power supply circuit 24 is configured so that the engine 13 can be started by the engine starter 23 only when the state is detected. The neutral position detection switch 22 is provided in series with a power supply circuit 24 of the engine starter 23. The neutral position detection switch 22 switches to the on state when the neutral state of the main transmission 18 is detected, operates the power supply circuit 24 to the closed side, and does not detect the neutral state of the main transmission 18. The power supply circuit 24 is configured to operate to the open side by switching to the cut state. Thus, when the main transmission 18 is in the neutral state, the engine start device 23 is allowed to start the engine 13, and when the main transmission 18 is not in the neutral state, the engine start device 23 is started. Ban.

  As shown in FIGS. 5B, 6 </ b> B, and 7 </ b> B, the main transmission lever 20 is supported so as to be swingable back and forth and right and left along the operation path 30. The operation path 30 of the main transmission lever 20 is an H shape in which an intermediate portion of the first front and rear portion 32 and an intermediate portion of the second front and rear portion 33 are connected to both ends of the lateral portion 31. In other words, by swinging the main speed change lever 20 in the left-right direction, the lateral portion 31 can be moved freely, and the main speed change lever 20 is swung in the front-rear direction while being moved to either end of the lateral portion 31. By doing so, the first front-rear part 32 and the second front-rear part 33 are movable.

  As shown in FIGS. 1 and 4, the main speed change lever 20 is connected and fixed to a round bar-like speed change shaft 25 which is in a horizontal posture. A plate-like connecting member 26 welded to the base end of the main transmission lever 20 is fastened and fixed to a plate-like connected member 28 welded to the end of the transmission shaft 25 by two bolts 27. Yes. The transmission shaft 25 has a lateral direction of the vehicle body as its axial direction X, and is supported by the operation unit case 34 of the transmission case 15 so as to be movable along the axial direction X and rotatable about the axial center. ing. One end portion (right end portion) of the transmission shaft 25 in the axial direction X is supported by the first cylindrical portion 35, and the other end portion (left end portion) of the transmission shaft 25 in the axial direction X is connected to the second cylindrical portion 36. It is supported. In this way, the transmission shaft 25 can be moved and operated along the axial direction X by swinging the main transmission lever 20 in the left-right direction, and can be rotated by swinging the main transmission lever 20 in the front-rear direction. It is provided for free operation.

  As shown in FIGS. 3 and 4, the main transmission 18 includes a transmission arm 37 that is moved and operated integrally with the transmission shaft 25 in addition to the transmission shaft 25, and an axial direction X of the transmission shaft 25. And a pair of engaging portions 41 and 42 that are selectively engaged by the speed change arm 37 by the moving operation, and the pair of engaging portions 41 and 42. A pair of shifters 47 and 48 that are moved to the shift position by the rotation operation of the transmission shaft 25 in a state where the transmission arm 37 is engaged with 42 are provided.

  The transmission arm 37 is a rod-like member that is penetrated and supported by the transmission shaft 25, and is fixed to the transmission shaft 25 so as to protrude downward from the outer peripheral portion of the transmission shaft 25. The transmission arm 37 is prevented from being detached from the transmission shaft 25 by a retaining cylinder 38 that is externally fitted to the transmission shaft 25. A spring 80 is externally fitted to the transmission shaft 25 at a portion located between the retaining cylinder 38 and the second cylinder portion 36.

  A first shifter 47 and a second shifter 48 are provided as a pair of shifters. A first support shaft 43 and a second support shaft 44 having an axis direction Y as a direction orthogonal to the axis direction X of the transmission shaft 25 are provided. The first support shaft 43 and the second support shaft 44 are disposed so as to be parallel to each other with an interval in the axial direction X of the transmission shaft 25. The first shifter 47 is operated to move in the axial direction Y of the first support shaft 43, so that the first shift fork 47a is swung and the first shift gear 49 is moved to the shift position to change the speed. I have to. Similarly to the first shifter 47, the second shifter 48 is operated to move in the axial direction Y of the second support shaft 44, thereby swinging the second shift fork 48a and moving the second shift gear 50. A shift operation is performed by moving to a shift position.

  The first shifter 47 integrally includes a first boss portion 45 slidable in the axial direction Y of the first support shaft 43, a first engagement portion 41 as an engagement portion, and a first shift fork 47a. In preparation. Similarly to the first shifter 47, the second shifter 48 also has a second boss portion 46 slidable in the axial direction Y of the second support shaft 44, and a second engagement portion 42 as an engagement portion. The second shift fork 48a is integrally provided. Both the first boss portion 45 and the second boss portion 46 are formed in a cylindrical shape that is externally fitted to the support shafts 43 and 44. Both the first engaging portion 41 and the second engaging portion 42 are formed in a U-shaped concave shape in plan view, and are disposed adjacent to each other in the axial direction X of the transmission shaft 25. The first engagement portion 41 and the second engagement portion 42 are disposed so that the concave openings thereof are opposed to each other, and the speed change arm 37 is provided at a portion where the first engagement portion 41 and the second engagement portion 42 are opened. Is arranged. The first engaging portion 41 and the second engaging portion 42 are freely engageable with the speed change arm 37 by moving the speed change arm 37 in the axial direction X of the speed change shaft 25 through the space of the opening. Since the first engaging portion 41, the second engaging portion 42, and the speed change arm 37 are thus arranged, the speed change arm 37 is moved by the moving operation along the axial direction X of the speed change shaft 25. The first engaging portion 41 and the second engaging portion 42 can be selectively engaged with each other by moving in the axial direction X. The first shifter 47 and the second shifter 48 are configured so that the speed change arm 37 is pivoted on the support shafts 43 and 44 by rotating the speed change shaft 25 in a state where the speed change arm 37 is engaged with the engaging portions 41 and 42. By moving in the center direction Y, the shift forks 47a and 48a are swung to move the shift gears 49 and 50 to the shift position.

  By moving the first shifter 47, the forward first speed position (shift position) where the first shift gear 49 meshes with a forward first speed gear not shown, and the reverse position where the first shift gear 49 meshes with a reverse gear not shown ( (Shifting position). Further, by moving the second shifter 48, the second shift gear 50 is engaged with a forward second speed gear (not shown) and the second shift gear 50 is changed to a forward third speed gear (not shown). It is possible to shift to a forward third speed position (shift position) that meshes.

  In FIG. 5, the main transmission lever 20 is in the neutral position N, the transmission arm 37 is positioned in a neutral position where it is engaged with both of the pair of engaging portions 41, 42, and the main transmission 18 is in the neutral position. The case where it is in a state is shown. As shown in FIG. 6, when the main transmission 18 is in a neutral state, the main transmission lever 20 is swung to the right along the lateral portion 31 to move the transmission shaft 25 to the right in the axial direction X. Thus, the speed change arm 37 is also moved to the right side so that only the first engagement portion 41 can be engaged with the speed change arm 37. Then, as shown in FIG. 7, by swinging the main transmission lever 20 to the forward first speed position F1 of the front end portion of the first front and rear portion 32, the transmission shaft 25 is rotated and the transmission arm 37 is also rotated. The first boss portion 45 of the first shifter 47 is slid along the first support shaft 43 and moved to the forward first speed position. Although not shown in FIG. 6, the first boss of the first shifter 47 is swung to the reverse position R of the rear end portion of the first front-rear portion 32 in FIG. The part 45 is slid along the first support shaft 43 and moved to the reverse position. Although not shown, in FIG. 5, contrary to FIG. 6, the transmission shaft 25 is moved to the left in the axial direction X by swinging the main transmission lever 20 to the left along the lateral portion 31. Then, the speed change arm 37 is also moved to the left side so that only the second engagement portion 42 can be engaged with the speed change arm 37. Therefore, in a state where the transmission arm 37 is engaged with the second engagement portion 42, the second shifter 48 is moved by swinging the main transmission lever 20 to the forward third speed position F <b> 3 of the front end portion of the second front and rear portion 33. Is moved to the forward second speed position, and the main shift lever 20 is swung to the forward second speed position F2 at the rear end of the second front-rear portion 33 to move the second shifter 48 to the forward second speed position. ing.

[Movement restriction mechanism 51]
In this embodiment, as shown in FIGS. 3, 4, 5 (A), 6 (A), and 7 (A), one of the pair of engaging portions 41, 42 is connected to one engaging portion. When the speed change arm 37 is engaged, a movement restricting mechanism 51 for restricting the shifter corresponding to the other engaging portion of the pair of shifters 47 and 48 is provided. The movement restricting mechanism 51 includes a restraining member 52, a first restricting body 53, and a second restricting body 54. The first restrictor 53 is provided in the first shifter 47, the second restrictor 54 is provided in the second shifter 48, and the check member 52 moves the first restrictor 53 and the second restrictor 54. By restricting, the movement operation to the shift position in the first shifter 47 and the second shifter 48 is restricted.

  The restraining member 52 is configured by a plate-like body arranged between the transmission shaft 25 and the first shifter 47 and the second shifter 48 in the vertical direction. The restraining member 52 is supported by the operation portion case 34 so as to be swingable around the vertical axis Z that is located on the rear end side and is directed to the vertical direction of the vehicle body. The first restricting body 53 is formed in a pin shape protruding upward from the side portion of the first boss portion 45. The second restricting body 54 is formed in a pin shape protruding upward from the side portion of the second boss portion 46. An operation groove portion 55 penetrating in the vertical direction is formed in the check member 52, and the transmission arm 37, the first restriction body 53, and the second restriction body 54 are inserted into the operation groove portion 55. Thereby, the check member 52 is pressed by the movement of the speed change arm 37 and swings around the vertical axis Z, and the movement of the first restriction body 53 and the second restriction body 54 is restricted by the operation groove portion 55. The movement operation of the first shifter 47 and the second shifter 48 to the shift position is restricted.

  The operation groove portion 55 of the check member 52 is provided with a front side groove portion 55a that allows the movement of the speed change arm 37 in the front-rear direction. When the speed change arm 37 moves in the axial direction X of the speed change shaft 25, The side wall portion of the side groove portion 55 a abuts against the speed change arm 37, so that the check member 52 is swung around the vertical axis Z by the speed change arm 37. The operation groove 55 includes a first lock groove 57 that locks the movement of the first restrictor 53 in the front-rear direction and a second lock groove 58 that locks the movement of the second restrictor 54 in the front-rear direction. Is provided. Further, the operation groove 55 includes a first rear shift groove 59 adjacent to the rear of the first lock groove 57 and extending obliquely with respect to the front-rear direction, and a first rear adjacent to the front of the first lock groove 57. A first front shift groove 61 extending continuously to the front side of the shift groove 59; a second rear shift groove 60 extending obliquely with respect to the front-rear direction adjacent to the rear of the second lock groove 58; and a second lock A second front shift groove 62 is provided adjacent to the front of the groove 58 and continuously extending to the front side of the second rear shift groove 60. Thus, the operation groove part 55 is formed in the left-right symmetrical shape which provided each groove | channel continuously.

  As shown in FIG. 5, when the speed change arm 37 is located at the neutral position, the speed change arm 37 is located at the center in the front-rear direction and the left-right direction with respect to the front groove portion 55a. The first restricting body 53 is positioned near the entrance before the first locking groove 57 is fitted, and the second regulating body 54 is located near the entrance before the fitting into the second locking groove 58. Yes. Then, as shown in FIG. 6, when the speed change arm 37 moves in the axial direction X of the speed change shaft 25 and reaches the position where only the first engagement portion 41 is engaged, the restraining member 52 rotates around the vertical axis Z. The second restricting body 54 is fitted in the second lock groove 58 and the movement in the front-rear direction is restricted. At this time, the first restricting body 53 is located at a portion where the first rear shift groove 59 and the first front shift groove 61 are continuous, and the first restricting body 53 is allowed to move in the front-rear direction. . As a result, when the speed change arm 37 is in a position where only the first engagement portion 41 is engaged, the first shifter 47 is allowed to move to the speed change position, and the second shifter 48 is allowed to move to the speed change position. Be regulated. Although illustration is omitted, since the first restricting body 53 is fitted into the first lock groove 57 when the speed change arm 37 is in a position where only the second engaging portion 42 is engaged, the first shifter 47 The movement operation to the shift position is restricted, and the movement operation of the second shifter 48 to the shift position is allowed.

[Neutral position detection switch 22, positioning tool 69]
As shown in FIGS. 3 and 4, a first recess 68 into which the detection unit 67 of the neutral position detection switch 22 can be inserted and removed and a positioning tool 69 for holding the neutral position are inserted into and removed from the transmission shaft 25. A free second recess 70 is formed. As can be understood from FIGS. 8 and 9, a second recess 70 is formed in the outer peripheral portion of the transmission shaft 25 at a position shifted about 90 degrees with respect to the first recess 68 about the axial direction X. In this embodiment, the length along the axial direction X of the transmission shaft 25 of the second recess 70 is set to be the same as the length along the axial direction X of the transmission shaft 25 of the first recess 68. .

  As shown in FIGS. 8 and 9, the first recess 68 is formed in a conical mortar shape having a central angle of approximately 90 degrees. The neutral position detection switch 22 is configured to detect that the detection unit 67 is inserted into the first recess 68. The neutral position detection switch 22 is attached to the switch support portion 71 of the operation portion case 34 so that the detection portion 67 is in contact with the transmission shaft 25, and captures the movement of the transmission shaft 25 in the axial direction X. It is detected that the detection unit 67 is inserted into the first recess 68.

  As shown in FIGS. 8 and 9, the second recess 70 formed in the outer peripheral portion of the transmission shaft 25 is formed in a conical mortar shape having a central angle of about 90 degrees, and the positioning position T is The lowermost inclined surface 72 is provided. The positioning position T is set to be the center position of the second recess 70 in the axial direction X and the circumferential direction of the transmission shaft 25. The positioning tool 69 includes a support 75 supported by the operation unit case 34, a spherical contact portion 73 (corresponding to a contact surface) that can be moved back and forth with respect to the support 75, and the contact portion 73 in the protruding direction. And an urging spring body 78. As a result, the positioning tool 69 is biased toward the axial center of the transmission shaft 25, and the positioning tool 69 is inserted into the second recess 70, whereby the positioning position T is brought into contact with the contact portion 73 of the positioning tool 69. The transmission shaft 25 is urged to move to a facing position.

  As shown in FIG. 5, when the speed change arm 37 is located at the neutral position, as shown in FIG. 8, the detection portion 67 of the neutral position detection switch 22 is inserted into the first recess 68, and the positioning tool 69 is It is configured to be inserted into the second recess 70. For example, as shown by the dotted line in FIG. 9, the positioning tool 69 is inserted into the second recess 70 even if the insertion position of the detection unit 67 of the neutral position detection switch 22 is out of the desired position of the first recess 68. Thus, as indicated by the white arrow, the contact portion 73 of the positioning tool 69 abuts against the inclined surface 72 of the second recess 70 by the urging force of the positioning tool 69 so that the positioning position T is the contact portion 73 of the positioning tool 69. The transmission shaft 25 is moved to a position facing the. By the movement of the transmission shaft 25, the detection unit 67 of the neutral position detection switch 22 is aligned with the desired position of the first recess 68 as shown by the solid line in FIG. It is possible to appropriately detect that it is inserted into the. Therefore, the neutral position detection switch 22 does not require fine adjustment work such as interposing a shim between the neutral position detection switch 22 and its mounting location and adjusting the thickness of the shim. The neutral state of the device 18 can be detected appropriately.

  As described above, the neutral position detection switch 22 captures the movement of the transmission shaft 25 in the axial direction X, and the shift arm 37 is positioned at the neutral position, so that the detection unit 67 is inserted into the first recess 68. It is detected. Therefore, when the speed change arm 37 is positioned at the neutral position, the movement restricting mechanism 51 restricts the movement operation of the pair of shifters 47 and 48 to the speed change position accompanying the turning operation of the speed change shaft 25.

  As shown in FIG. 5, when the speed change arm 37 is located at the neutral position, the first restricting body 53 is located near the entrance before fitting into the first lock groove 57, and the second restricting body 54. However, it is located near the entrance in front of the second locking groove 58. When the transmission arm 37 is to be rotated by the rotation operation of the transmission shaft 25, both of the pair of engaging portions 41 that are engaged by the transmission arm 37 in an overlapping manner tend to move in the front-rear direction. At this time, the operation groove 55 of the check member 52 includes a first rear wall 63 that contacts the rear side of the first restricting body 53, a first front wall 65 that contacts the front side of the first restricting body 53, and a first A second rear wall 64 that comes into contact with the rear side of the second restricting body 54 and a second front wall 66 that comes into contact with the front side of the second restricting body 54 are provided. Therefore, when the first rear wall 63 and the first front wall 65 are in contact with the first restriction body 53, the movement of the first restriction body 53 in the front-rear direction is restricted, and the movement of the first shifter 47 to the shift position is performed. Operation is restricted. Further, when the second rear wall 64 and the second front wall 66 abut against the second restricting body 54, the movement of the second restricting body 54 in the front-rear direction is restricted, and the second shifter 48 is moved to the shift position. Operation is restricted.

[Another embodiment]
(1) In the above embodiment, an example is shown in which the length along the axial direction X of the second recess 70 is set to be the same as the length along the axial direction X of the first recess 68. However, it is not limited to this. For example, the length along the axial direction X of the second recess 70 may be set to be greater than the length along the axial direction X of the first recess 68.

  (2) In the above embodiment, an example in which the first concave portion 68 and the second concave portion 70 are formed in a conical mortar shape is shown. However, the present invention is not limited to this, and the shape of the first concave portion 68 is a spherical shape or the like. The second concave portion 70 may be formed as long as it has an inclined surface such as a spherical surface.

  (3) In the above embodiment, the positioning tool 69 is provided with the spherical contact portion 73 and the spring body 78 that urges the contact portion 73 in the protruding direction. Absent. The positioning tool 69 can employ various configurations. For example, the positioning tool 69 includes a rod-shaped member having a contact portion whose tip is formed on a spherical surface and a spring body that urges the rod-shaped member in the protruding direction. Other positioning tools such as those described above may be used.

  (4) In the above embodiment, when the main transmission lever 20 is located at the neutral position N at the center position of the lateral portion 31 in the operation path 30, the transmission arm 37 is connected to the pair of engagement positions. Although it is located at a neutral position that overlaps and engages both of the joint portions 41, for example, one end position of the lateral portion 31 (a position that intersects the first front and rear portion 32) may be set as the neutral position N. The position of the neutral position N can be changed as appropriate. The operation path 30 of the main transmission lever 20 is provided with a guide groove for guiding the main transmission lever 20, or a member such as F1 or R that is not provided with such a guide groove and is inserted into the main transmission lever 20. The thing provided only with the display part may be sufficient.

  (5) In the above embodiment, the movement restricting mechanism 51 is exemplified by the operation groove 55 formed in the restraining member 52 that restricts the movement of the first restrictor 53 and the second restrictor 54 in the front-rear direction. Instead, for example, when the first shifter 47 is moved, the movement of the second shifter 48 is restricted, and conversely, when the second shifter 48 is moved, the first shifter It is also possible to provide a linkage mechanism that links the movement of the first shifter 47 and the movement of the second shifter 48 so as to restrict the movement operation of 47. As the linkage mechanism, for example, the boss portion of the first shifter and the boss portion of the second shifter are connected by a cylindrical member, and a plurality of balls are interposed inside the cylindrical member, so that the first shifter is In the case of performing the moving operation, the moving operation of the second shifter can be restricted by fitting the ball into the recess formed in the boss portion of the second shifter.

  (6) Although the tractor is shown as an example of the work vehicle in the above embodiment, the present invention is not limited to this, and various work vehicles such as a rice transplanter, a combiner, a lawn mower, and a construction machine may be used.

22: Neutral position detection switch 25: Transmission shaft 37: Transmission arm 41: First engagement portion 42: Second engagement portion 47: First shifter 48: Second shifter 51: Movement restriction mechanism 53: First restriction body 54 : Second regulating body 67: detecting portion 68: first recess 69: positioning tool 70: second recess 72: inclined surface 73: contact portion ("contact surface")
T: Position for positioning X: Axial direction

Claims (5)

A speed change shaft supported so as to be movable and rotatable along the axial direction;
A transmission arm that is moved and operated integrally with the transmission shaft;
A pair of engaging portions arranged adjacent to each other and selectively engaged by the speed change arm by a movement operation along the axial direction of the speed change shaft;
A pair of shifters that are provided for each of the pair of engaging portions, and are moved to a shift position by a rotation operation of the transmission shaft in a state where the shift arm is engaged with the engagement portions; Is provided with
The transmission shaft is formed with a first recess in which a detection unit of the neutral position detection switch can be inserted and removed, and a second recess in which a positioning tool for holding the neutral position can be inserted and removed,
The neutral position detection switch is configured to detect that the detection unit is inserted into the first recess,
The second recess has an inclined surface with the positioning position at the lowest position,
The positioning tool is biased toward the axial center of the transmission shaft, and the positioning shaft is inserted into the second recess, whereby the positioning shaft is moved to a position where the positioning position faces the positioning tool. Energized to move,
When the shift arm is positioned at a neutral position where it is engaged with both of the pair of engaging portions, the detecting portion is inserted into the first recess, and the positioning tool is inserted into the second recess. Inserted ,
The length of the second recess along the axial direction is the same as the length of the first recess along the axial direction, or from the length of the first recess along the axial direction. set tare Ru neutral position detecting device as is also increased.
  2. The neutral position detecting device according to claim 1, wherein the positioning tool has a contact surface that is inserted into the second recessed portion to contact the inclined surface and guide and move the transmission shaft.   Movement that restricts movement operation of the shifter corresponding to the other engaging portion of the pair of shifters when the speed change arm is engaged with one engaging portion of the pair of engaging portions. The neutral position detection device according to claim 1, further comprising a restriction mechanism.   The movement restricting mechanism restricts a movement operation in each of the pair of shifters by restricting a movement associated with a rotation operation of the transmission shaft with respect to a restriction body provided in each of the pair of shifters; and The structure according to claim 3, wherein when the speed change arm is located at the neutral position, the movement of the speed change shaft with respect to the restriction body of the pair of shifters is restricted. The neutral position detector described.   Each of the pair of engaging portions is formed in a concave shape that is open at a portion facing the speed change arm and is engageable by movement of the speed change arm through the opening. The neutral position detection device according to one item.
JP2013115652A 2013-05-31 2013-05-31 Neutral position detector Active JP6025661B2 (en)

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CN105027810A (en) * 2015-07-13 2015-11-11 苏州金威特工具有限公司 Mower capable of preventing accidental injuries

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