JP4537764B2 - Working gear shifting structure - Google Patents

Description

  The present invention relates to a traveling speed change structure for a work vehicle provided with a continuously variable transmission for traveling.

  As a working vehicle equipped with a continuously variable transmission for traveling, for example, there is one disclosed in Patent Document 1. In Patent Document 1, a continuously variable transmission is operated, and a shift lever (13 and 16 in FIGS. 2 and 3 of Patent Document 1) that is artificially operated is provided, and a positioning member (Patent) 3 in FIG. 3 and 31 in FIG. 5, a locking member (36 in FIG. 3 and FIG. 5 in Patent Document 1) is provided on the speed change lever, and the locking member of the speed change lever is attached to the positioning member of the fixing portion. By engaging with the recesses (33 and 35 in FIG. 5 of Patent Document 1), the shift lever can be held at a desired operation position.

  In Patent Document 1, a fixed side click member (41 and 42 in FIGS. 3 and 5 of Patent Document 1) is provided in the fixed portion separately from the locking member of the shift lever and the positioning member of the fixed portion. Is provided with a movable side click member (43 in FIGS. 3 and 5 of Patent Document 1). As a result, when the speed change lever is operated, the movable side click member of the speed change lever engages and separates from the fixed side click member of the fixed portion, giving a click feeling to the operation of the speed change lever.

Japanese Patent Laying-Open No. 2003-291677 (FIGS. 2, 3, 4, and 5)

In Patent Document 1, a shift lever locking member and a fixing member positioning member are provided in order to hold the shift lever at a desired operation position. A movable side click member of the lever and a fixed side click member of the fixed portion are provided. As described above, in Patent Document 1, since a relatively large number of members are required to hold the shift lever at a desired operation position and to give a click feeling to the operation of the shift lever, it is said that the structure is simplified. There is room for improvement.
The present invention simplifies a structure for maintaining a shift lever at a desired operation position and a structure for giving a click feeling to the operation of the shift lever in a traveling shift structure of a work vehicle equipped with a continuously variable transmission for traveling. The purpose is to configure.

[I]
(Constitution)
A first feature of the present invention resides in the following structure in a traveling speed change structure for a work vehicle.
A continuously variable transmission for driving, the conjunction and a shift lever which is artificially manipulated in those operating the continuously variable transmission, the shift lever, the machine body transverse direction of the axis to the lateral side of the transmission case A lever portion rotatably supported around, a bracket fixed to an upper portion of the lever portion, and a grip portion supported by the bracket so as to be swingable around a shaft center in a longitudinal direction of the machine body via a support shaft; and configured to include a includes a plurality of engaging portions on the fixed portion along the operation path of the shift lever, the engagement and separation freely engaging member to the engaging portion, apart from the support than said grip portion The shaft is supported so as to be swingable about the axis in the longitudinal direction of the machine body, and the engagement member is in contact with the grip portion from the side opposite to the locking portion side to contact the base portion of the grip portion. forming a hook part, engages the engaging member with the locking portion A biasing vital the contact portion on the side provided with a spring biasing on the side brought into contact with the base of the grip portion, by oscillating the engagement member by the biasing force of the spring, the engagement member is engaged with the engaging portion, the shift lever is held in a desired operating position, by the operation of the high-speed side of the shift lever to said engaging member the locking portion by the urging force of the spring And the separation from the engaging portion against the urging force of the spring is repeated, so that the operation of the shift lever to the high speed side is permitted, and the operation of the shift lever to the low speed side is allowed to perform the engagement. The joint member is not separated from the locking portion, and the operation of the speed change lever to the low speed side is prevented, and the engagement member is resisted against the biasing force of the spring by the swinging operation of the grip portion. Rocking the engaging member away from the locking portion. In high-speed side and operation to the low speed side of the shift lever are configured to be allowed.

(Function)
According to the first feature of the present invention, a plurality of locking portions are provided in the fixed portion along the operation path of the speed change lever, and an engaging member and an engaging member that can be engaged with and separated from the locking portion are used as the locking portions. and a spring for biasing towards engaging, the engaging member engages the engaging portion, the shift lever is held in a desired operating position.

Next, according to the first feature of the present invention, when operating the speed change lever, the operation of the speed change lever is permitted by operating the speed change lever so that the engaging member moves away from the locking portion against the spring. By operating the shift lever, the engaging member moves away from the locking portion against the spring, the engaging member engages with the next locking portion by the spring, and the engaging member again springs. Against this, the separation from the next locking portion is repeated. As described above, the engagement member repeatedly engages and separates from the plurality of locking portions, thereby giving a click feeling to the operation of the shift lever.
As described above, according to the first feature of the present invention, the shift lever can be held at a desired operation position by the engaging member and the spring, and the click feeling is felt in the operation of the shift lever by the same engaging member and the spring. Can be given.

(The invention's effect)
According to the first aspect of the present invention, in a traveling speed change structure for a work vehicle equipped with a continuously variable transmission for travel, the speed change lever can be held at a desired operation position by an engagement member and a spring. It became possible to give a click feeling to the operation, and it was possible to share the members and simplify the structure.

(Function)
According to a first aspect of the present invention, if the temporarily accelerated during traveling of holding the shift lever in the desired operating position, by operating the shift lever to the high speed side, the shift lever by the engagement member and the spring A click feeling is given to the operation toward the high speed side, and the engaging member is engaged with the locking portion, so that the shift lever is held at a desired operation position.

In this case, according to the first feature of the present invention, even if the shift lever is operated to the low speed side, the engagement member is not separated from the locking portion when the shift lever is operated to the low speed side, and the shift lever is moved to the low speed side. Therefore, the speed change lever is securely held at a desired operation position (in general, the continuously variable transmission provided in the work vehicle is often biased to the low speed side).

According to the first feature of the present invention, when the shift lever is operated to the low speed side, the engaging member is engaged with the engaging portion by separating the engaging member from the engaging portion by swinging the grip portion left and right. Without making it happen (without giving a click feeling to the operation of the shift lever to the low speed side), the shift lever can be operated to the low speed side, and the shift lever can be quickly operated to the low speed side.
Further , by separating the engaging member from the locking portion by the left / right swinging operation of the grip portion , a click feeling is given to the operation to the high speed side of the shift lever without engaging the engaging member with the locking portion. (Not), the shift lever can be operated to the high speed side.

(The invention's effect)
According to the first aspect of the present invention, the shift lever is securely held at a desired operation position, a click feeling is given to the high speed operation of the shift lever, and the low speed operation of the shift lever is clicked. The operability of the shift lever can be improved by the fact that the feeling is not given and the shift lever can be quickly operated to the low speed side.

(Function)
According to the first feature of the present invention, when the shift lever is held by hand, the engagement member can be separated from the locking portion by operating the shift lever in the cross direction. The shift lever can be operated to the low speed side without switching (the shift lever can be operated to the high speed side). Thus, according to the first feature of the present invention, for example, after holding another operation lever by hand and separating the engagement member from the locking portion, the operation lever is changed to the transmission lever. There is no need to do.
(The invention's effect)
According to the first feature of the present invention, by operating the speed change lever in the crossing direction, the engaging member can be separated from the locking portion, and then the speed change lever is operated to the low speed side without changing hands. As a result, the operability of the shift lever can be improved.

[II]
(Constitution)
The second feature of the present invention resides in the following structure in the traveling speed change structure for a work vehicle according to the first feature of the present invention.
The bracket includes a convex portion that restricts swinging of the grip portion toward the locking portion, and a spring that biases the grip portion toward the locking portion and contacts the convex portion. is there.

[III]
(Constitution)
A third feature of the present invention resides in the following structure in the traveling speed change structure for a work vehicle according to the second feature of the present invention.
A spring that urges the engaging member toward the side that engages the locking portion and a spring that urges the grip portion toward the locking portion are configured as a single spring, and the spring is the support shaft. And is installed over the bracket, the engaging member, and the grip portion.

  As shown in FIG. 1, an engine 3 is provided at the front of the aircraft supported by the right and left front wheels 1, and the right and left rear wheels 2, and a driving unit 4 and a transmission case 5 are provided at the rear of the aircraft. Thus, a four-wheel drive agricultural tractor, which is an example of a work vehicle, is configured. The power of the engine 3 is transmitted to the transmission case 5 via a transmission shaft (not shown), and a hydrostatic continuously variable transmission (corresponding to a continuously variable transmission) (not shown) provided in the transmission case 5; In addition, the power is transmitted to the rear wheel 2 via a gear transmission type auxiliary transmission (not shown), and the power branched immediately before the rear wheel 2 is transmitted to the front wheel 1 via the transmission shaft 6.

The hydrostatic continuously variable transmission is configured to be freely operated at the high speed side of forward F, the high speed side of reverse R, and the neutral stop position N. Next, the operation structure of the hydrostatic continuously variable transmission by the shift pedal 10 is described. explain.
As shown in FIGS. 2, 4, and 6, the trunnion shaft 7 for operating the hydrostatic continuously variable transmission protrudes from the mission case 5 to the left laterally outward, and a vibration-proof weight 8 is connected to the trunnion shaft 7. The cam member 9 is connected to the weight 8. An operation arm 14 provided with a roller 14a is swingably supported around a horizontal axis P2 in the left-right direction of the machine body on the left lateral side of the mission case 5, and the operation arm 14 is moved to the left in FIG. The roller 14 a of the operation arm 14 is pressed by the cam member 9 and the trunnion shaft 7 is biased to the neutral stop position N by the operation arm 14 and the spring 15.

  As shown in FIGS. 2, 4, and 5, the relay shaft 11 is rotatably supported at the upper part of the rear portion of the transmission case 5, and extends between the arm 11 a fixed to the left end portion of the relay shaft 11 and the cam member 9. The connecting rod 12 is connected. As shown in FIGS. 1, 4, and 5, a speed change pedal 10 is supported on the right side of the driving unit 4 so as to be swingable back and forth around the horizontal axis P <b> 1 in the left-right direction of the vehicle body. The connecting rod 13 is connected across the arm 11b fixed to the arm and the arm 10a fixed to the speed change pedal 10.

  When the shift pedal 10 is stepped forward (rearward) from the state shown in FIGS. 2, 4, and 5, the trunnion shaft 7 moves from the neutral stop position N to the high speed side of the forward movement F via the linkage rods 12 and 13 and the relay shaft 11. It is operated to the (high speed side of reverse R). In this way, when the trunnion shaft 7 is operated from the neutral stop position N to the high speed side of the forward movement F (the high speed side of the reverse movement R), the roller 14a of the operation arm 14 is pushed by the cam member 9 to the right in FIG. Thus, the trunnion shaft 7 is urged to the neutral stop position N by pushing the roller 14 a of the operation arm 14.

Next, the operation structure of the hydrostatic continuously variable transmission using the shift lever 16 will be described.
As shown in FIGS. 2 and 3, a bolt 17, a support plate 18 and a lateral member 19 are connected to the left lateral portion of the mission case 5, and an operation shaft 20 is connected to the support plate 18 around a horizontal axis P3 in the left-right direction of the machine body. The auxiliary transmission lever 21 is coupled to the operation shaft 20. The auxiliary transmission lever 21 protrudes upward from the left rear wheel fender 33 (corresponding to the fixed portion), and the auxiliary transmission lever 21 is positioned on the left side of the driver seat 37 (see FIG. 1). Thus, a gear transmission type auxiliary transmission (not shown) provided in the transmission case 5 is operated.

  As shown in FIGS. 2 and 3, a boss portion 22 is fitted on the operation shaft 20 so as to be relatively rotatable, and a lever portion 16 a of the speed change lever 16 is fixed to the boss portion 22. Is extended upward, and a grip portion 16b is provided on the upper portion of the lever portion 16a of the transmission lever 16. An opening 34 (corresponding to the operation path) is formed in the left rear wheel fender 33 along the front-rear direction of the vehicle body, and the grip 16b of the speed change lever 16 protrudes upward from the opening 34 so that a driver seat 37 (FIG. 1), the grip 16b of the speed change lever 16 is located on the left side, and the grip 16b of the speed change lever 16 is operated along the opening 34 in the longitudinal direction of the body.

  As shown in FIGS. 2 and 3, a boss portion 23 is fitted on the operation shaft 20 so as to be relatively rotatable, and arms 23 a and 23 b are fixed to the boss portion 23, and the arm 23 a of the boss portion 23 and the relay shaft are fixed. The connecting rod 24 is connected to 11 arms 11a. A spring 25 is externally fitted to the boss portion 22, and the lever portion 16 a of the speed change lever 16 is biased to the neutral stop position N by the spring 25, and the arm 23 b of the boss portion 23 is in front of the lever portion 16 a of the speed change lever 16. It has been applied to.

  As shown in FIGS. 7 (a) and 8 (b) (b), a bracket 26 having a U-shape in plan view is fixed to the upper portion of the lever portion 16a of the transmission lever 16, and a support shaft 27 is mounted on the bracket 26. A bracket 28, which is attached in the front-rear direction and is U-shaped in a side view, is swingably supported around the support shaft 27 (around the horizontal axis P4 in the front-rear direction of the machine body), and the grip of the speed change lever 16 is supported by the bracket 28. The part 16b is fixed. A pin 29 is fixed to the bracket 26, and a spring 30 externally fitted to the support shaft 27 is installed over the bracket 28 and the pin 29, and the grip 30b of the speed change lever 16 is moved by the spring 30 as shown in FIG. It is urged to the right side of the drawing (the lower side of the drawing in FIG. 8 (a)), and the bracket 28 comes into contact with the projection 26a of the bracket 26, so that the grip 16b of the speed change lever 16 is shown in FIG. The action posture A1 shown is maintained.

As shown in FIGS. 3, 7 (A), 8 (A) and (B), the U-shaped engagement member 31 swings around the support shaft 27 (around the horizontal axis P4 in the longitudinal direction of the machine body). The engaging portion 31 a is fixed to the engaging member 31 by being freely supported. A spring 30 is stretched over the engaging member 31 and the pin 29, and the engaging member 31 is urged by the spring 30 to the right of the paper surface of FIG. The engaging member 31 is formed with a contact portion 31b that contacts the base portion of the grip portion 16b.

  As shown in FIGS. 7 (a) and 8 (a), the locking member 32 is fixed along the range of the forward movement F of the opening 34, and a plurality of lockings are provided at the lateral end of the locking member 32. The portion 32a is formed along the range of the forward movement F of the opening 34 (the locking portion 32a of the locking member 32 is not provided in the range of the backward movement R of the opening 34). With respect to the operation direction of the grip portion 16b of the speed change lever 16 (left and right direction in FIG. 8A) and the opening 34, the side portion on the right side of FIG. 8A in the locking portion 32a of the locking member 32. Is inclined and the paper surface of FIG. 8 (A) in the locking portion 32a of the locking member 32 with respect to the operation direction of the grip portion 16b of the speed change lever 16 (left and right direction in FIG. 8 (B)) and the opening 34. The left side portion is orthogonal, and the locking portion 32a of the locking member 32 has a sawtooth shape.

2, 7 (a) and 8 (a) are states in which the grip portion 16b of the speed change lever 16 is operated to the neutral stop position N, and the grip portion 16b of the speed change lever 16 is in the action posture A1. It is in a state.
In this state, the lever portion 16a of the speed change lever 16 is biased to the neutral stop position N by the spring 25, and the engagement portion 31a of the engagement member 31 engages with the engagement portion 32a of the engagement member 32 to change the speed. The grip portion 16 b of the lever 16 is held at the neutral stop position N. The trunnion shaft 7 is positioned at the neutral stop position N by the operating arm 14 and the spring 15, and the trunnion shaft 7 is biased to the neutral stop position N by the operating arm 14 and the spring 15, whereby the arm 23 b of the boss portion 23 is moved. It is applied to the front side of the lever portion 16a of the transmission lever 16.

  When the grip 16b of the speed change lever 16 is operated to the high speed side of the forward movement F from the state shown in FIGS. 2, 7 (a) and 8 (a) (when operated to the left in FIG. 8 (a)), the speed change lever By operating the 16 grip portions 16b, the engaging member 31 (engaging portion 31a) swings around the horizontal axis P4 to the left in FIG. Is moved away from the locking portion 32a of the locking member 32, and the engaging member 31 (engaging portion 31a) swings around the horizontal axis P4 to the right in FIG. The engaging portion 31a of the engaging member 31 is engaged with the next engaging portion 31a of the engaging member 32. By repeating such an operation, the forward speed F of the grip portion 16b of the speed change lever 16 is increased. A click feeling is given to the operation to the side. When the grip portion 16b of the transmission lever 16 is operated to the high speed side of the forward movement F, the engagement member 31 (engagement portion 31a) swings around the horizontal axis P4 as described above, whereas the transmission lever 16 The grip portion 16b does not swing around the horizontal axis P4 (the grip portion 16b of the transmission lever 16 does not swing from the action posture A1).

  As described above, when the grip portion 16b of the speed change lever 16 is operated to the high speed side of the forward movement F, the lever portion 16a of the speed change lever 16 pushes the arm 23b of the boss portion 23 to the left in FIG. Thus, the trunnion shaft 7 is operated from the neutral stop position N to the high speed side of the forward movement F (the high speed side of the reverse movement R), and the shift pedal 10 is operated forward. Next, even if the grip portion 16b of the speed change lever 16 is operated to a desired operation position and the hand is released from the grip portion 16b of the speed change lever 16, the engagement portion 31a of the engagement member 31 locks the locking member 32. By engaging the portion 32a, the grip portion 16b of the transmission lever 16 is held at a desired operation position (the trunnion shaft 7 is held at a desired operation position).

  In this case, since the arm 23b of the boss portion 23 is applied to the front side of the lever portion 16a of the speed change lever 16, the grip portion 16b of the speed change lever 16 is held in a desired operation position as described above (the trunnion). In a state where the shaft 7 is held at a desired operation position), the trunnion shaft 7 can be operated to the higher speed side of the forward movement F than the aforementioned desired operation position by depressing the shift pedal 10 forward. (The arm 23b of the boss portion 23 moves away from the front side of the lever portion 16a of the speed change lever 16 to the left side in FIG. 2). Thereafter, when the forward stepping operation of the shift pedal 10 is stopped, the trunnion shaft 7 returns to the aforementioned desired operation position (a state where the arm 23b of the boss portion 23 is applied to the front side of the lever portion 16a of the shift lever 16). Back to).

  In the state where the grip portion 16b of the speed change lever 16 is operated to the high speed side of the forward movement F as described above, the grip portion 16b of the speed change lever 16 acts as shown in FIGS. When operated from the posture A1 to the release posture A2 around the horizontal axis P4 (corresponding to a state in which the grip portion 16b of the speed change lever 16 is operated in the crossing direction, the grip portion 16b of the speed change lever 16 is moved to the driver seat 37 (FIG. 1). (Refer to the state of operation close to the reference)), by the grip portion 16b of the transmission lever 16, the engaging member 31 (engaging portion 31a) swings around the horizontal axis P4 to the left in FIG. Thus, the engaging portion 31 a of the engaging member 31 is separated from the engaging portion 32 a of the engaging member 32.

  Thus, by holding the grip portion 16b of the transmission lever 16 in the release posture A2, the engagement portion 31a of the engagement member 31 is not engaged with the engagement portion 32a of the engagement member 32, so that the The grip portion 16b can be operated toward the neutral stop position N. Due to the shape of the locking portion 32a of the locking member 32, the grip portion 16b of the speed change lever 16 cannot be operated toward the neutral stop position N with the acting posture A1. In this case, by holding the grip portion 16b of the transmission lever 16 in the release posture A2, the engagement portion 31a of the engagement member 31 is not engaged with the engagement portion 32a of the engagement member 32, so that the transmission lever 16 It is also possible to operate the grip portion 16b on the high speed side of the forward movement F.

  As shown in FIGS. 1 and 4, side brakes (not shown) capable of independently braking the right and left rear wheels 2 are provided, and right and left brakes can be independently braked. A left side brake pedal 35 is provided. As shown in FIGS. 2, 7 (A) and 8 (A), a wire 36 is connected across the right and left side brake pedals 35 and the engaging member 31, and the right and left side brake pedals 35 are connected. The wire 36 is configured to be pulled by stepping on simultaneously.

  Thereby, as described above, the grip portion 16b of the speed change lever 16 is operated to the high speed side of the forward movement F (the engaging portion 31a of the engaging member 31 is engaged with the engaging portion 32a of the engaging member 32). 7), when the right and left side brake pedals 35 are depressed simultaneously, the wire 36 is pulled and the engaging member 31 (engaging portion 31a) is moved around the horizontal axis P4 in FIG. The engaging portion 31 a of the engaging member 31 is separated from the engaging portion 32 a of the engaging member 32. Therefore, as shown in FIG. 2, the lever 16 a of the speed change lever 16 is operated to the neutral stop position N by the spring 25, and the trunnion shaft 7 is operated to the neutral stop position N by the operating arm 14 and the spring 15. .

  2 and 8 (a), the grip 16b of the speed change lever 16 is operated to the neutral stop position N, and the grip 16b of the speed change lever 16 is operated to the high speed side of the forward movement F. In the state where the shift pedal 10 cannot be stepped backward (the trunnion shaft 7 cannot be operated to the high speed side of the reverse travel R) (the arm 23b of the boss portion 23 is on the front side of the lever portion 16a of the shift lever 16). Therefore, the shift pedal 10 cannot be operated backward (the trunnion shaft 7 cannot be operated to the high speed side of the reverse travel R)).

  In this case, as shown in FIGS. 2 and 8 (a), when the grip portion 16b of the speed change lever 16 is operated to the release posture A2 and moved backward R, the trunnion shaft 7 remains in the neutral stop position N. Thus, the front side of the lever portion 16a of the speed change lever 16 is separated from the arm 23b of the boss portion 23 to the right side in FIG. Therefore, in this state, the shift pedal 10 can be stepped backward (the trunnion shaft 7 can be operated to the high speed side of the reverse travel R).

[Another Embodiment of the Invention]
Instead of the hydrostatic continuously variable transmission of the above-mentioned [Best Mode for Carrying Out the Invention], a mechanical continuously variable that can be operated to the high speed side of the forward F, the high speed side of the reverse R, and the neutral stop position N. A continuously variable transmission that can be operated only on the high speed side of the forward movement F, such as a transmission or a belt-type continuously variable transmission, may be used.
The present invention can be applied not only to agricultural tractors but also to agricultural work vehicles such as riding rice transplanters and combines, and construction work vehicles such as wheel loaders.

Whole side view of agricultural tractor Side view of the vicinity of the shift lever and trunnion shaft Longitudinal front view near the gear shift lever Top view of the shift pedal, right and left side brake pedals, and trunnion shaft Side view near the shift pedal Side view near the trunnion shaft Longitudinal front view with the grip part of the speed change lever in the operating and release positions Plan view of the vicinity of the grip portion of the speed change lever and the locking member

5 Mission case 16 Shift lever
16a Lever part
16b Grip part
26 Bracket
26a Convex part
27 Support shaft 30 Spring 31 Engagement member
31b Contact portion 32a Locking portion 33 Fixing portion
P3 Aircraft left and right axis
P4 Axle core in the longitudinal direction

Claims (3)

A continuously variable transmission for traveling, and a shift lever that is operated artificially by operating the continuously variable transmission;
The shift lever includes a lever portion that is supported on a lateral side portion of the transmission case so as to be rotatable around a lateral axis of the aircraft, a bracket that is fixed to the upper portion of the lever portion, and a support shaft that is attached to the bracket via a support shaft. And a grip portion that is supported so as to be swingable around an axis in the longitudinal direction of the machine body.
A plurality of locking portions are provided on the fixed portion along the operation path of the speed change lever ,
An engaging member that can be engaged with and separated from the locking portion is supported on the support shaft so as to be swingable about an axis in the longitudinal direction of the machine body separately from the grip portion, and the grip is attached to the engaging member. A contact portion that contacts the base portion of the grip portion from a side opposite to the locking portion side with respect to the portion , urges the engagement member to a side that engages with the locking portion, and A spring for biasing the contact portion to the side contacting the base of the grip portion ;
By oscillating the engagement member by the biasing force of the spring, and engaging the engaging member to the engaging portion, the shift lever is held in a desired operating position, the high speed side of the shift lever It said engaging member by the operation of the by repeatedly separated from the engaging portion against the biasing force of the engagement and the spring to the locking portion by the urging force of the spring, fast the shift lever To the low speed side of the speed change lever, the engagement member is not separated from the locking portion, and the speed change lever is prevented from being operated to the low speed side. Swinging the engaging member against the urging force of the spring and moving the engaging member away from the locking portion by moving the left and right of the portion to the high speed side and the low speed side run working vehicle operation are constituted to have acceptable Shifting structure. The bracket includes a convex portion that restricts swinging of the grip portion toward the locking portion, and a spring that biases the grip portion toward the locking portion and contacts the convex portion. The traveling speed change structure for a work vehicle according to claim 1. A spring that urges the engaging member toward the side that engages the locking portion and a spring that urges the grip portion toward the locking portion are configured as a single spring, and the spring is the support shaft. The work transmission shift structure according to claim 2 , wherein the work gear is mounted over the bracket, spanning the bracket, the engaging member, and the grip portion .

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