JP3308710B2 - Finger-operated shift lever for management machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a shift lever mechanism capable of performing a shift operation with one finger.

[0002]

2. Description of the Related Art In a transmission case of a management work machine, the present applicant slides a shifter by loosening a shift wire to selectively fit one of a plurality of ball clutches and a shift gear. An application has been filed for a non-clutch type transmission gear mechanism that allows the user to loosen the transmission wire only by pressing a finger near the handle grip. .
This shift lever mechanism is capable of rotating only in the pressing direction of the shift lever by pivotally supporting a rotating body that pivotally supports a shift wire end near a handle grip with a one-way clutch interposed therebetween. Is used to set the gear position.

[0003]

However, in the above-mentioned speed change lever mechanism, since the rotating body for pivotally supporting the speed change wire end can be rotated only in one direction, the displacement of the detent position by one lever operation is constant. When three gears are provided, low speed → medium speed → high speed → medium speed → low speed → medium speed → high speed →
... and so on, the gear can only be shifted one step at a time,
It was not possible to change the speed by skipping the middle speed, for example, from high speed to low speed with one lever operation. Such a shift operation is possible with a lever mechanism that rotates the lever back and forth or up and down, but with this lever mechanism, the hand must be released from the steering wheel during the shift operation, and the power It is necessary to stop the machine by turning off the power, the operation is complicated, and a step is likely to occur in the field due to the power cut during shifting. Therefore, a finger-operated speed change lever mechanism that can perform a speed change operation over a gear is required.

[0004]

The present invention uses the following means in order to solve the above problems. That is, in the vicinity of the handle grip portion of the management work machine, the first rotating body is pivotally supported via a one-way clutch, and the second rotating body that meshes with the first rotating body and connects the end of the transmission wire is pivoted. Support, the second rotating body is provided with a ratchet that allows only rotation by gear engagement with the first rotating body,
The first rotating body is provided with a first shift lever, and the first rotating body is rotatable by pressing the first shift lever, and the second rotating body is provided with a second shift lever. Then, the ratchet of the second rotating body is released by the pressing operation of the second transmission lever, and the gears of both rotating bodies are released, and the second rotating body is brought into contact with the first rotating body. A finger-operated shift lever is configured to be rotatable in a direction opposite to a rotation allowable direction due to gear engagement.

[0005]

The first rotating body is rotated in one direction by the pressing operation of the first transmission lever, and the second rotating body pivotally connecting the end of the transmission wire is allowed to rotate by gear engagement with the first rotating body. By rotating in the direction, the rotational direction of the connecting portion at the end of the speed change wire is kept constant, and a normal speed change operation can be performed for each step. On the other hand, by the pressing operation of the second shift lever, the gear mesh and the ratchet are released, and the second rotating body is rotated in the opposite direction.
A shift operation beyond the gear can be performed.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall side view of the management work machine, FIG. 2 is an overall plan view of the same, FIG. 3 is a side view of a finger-operated shift lever mechanism of the present invention,
4 is a plan sectional view, FIG. 5 is an internal front view of a transmission case, FIG. 6 is an internal front view of an axle suspension part, FIG. 7 is a front partial sectional view of an auxiliary transmission gear switching mechanism,
FIG. 8 is a partial side view of the transmission case M.

The overall configuration of the management work machine will be described with reference to FIGS. 1 and 2. An engine E is mounted on an engine stand 31, and a fuel tank 30 is mounted at the rear of the engine E. Transmission case 2 on the side of engine E
Power is transmitted to the transmission case M via the transmission case 5, and the axle 23 of the traveling wheel 24 suspended from the transmission case M is driven to travel. In the transmission case 25, a transmission belt 27 is wound around an input pulley 29 a of the transmission case M from an output pulley 26 of the engine E, and a tension clutch 28 can be pressed against the transmission belt 27.
The belt transmission can be turned on and off. A hitch 32 is protruded rearward from the transmission case M,
A work machine such as a rotary tilling device R is mounted.

A handle base 21 is pivotally supported on the upper part of the transmission case M so as to be rotatable in all directions. A handle 20 extends from an upper end of the handle base 21. A main transmission lever 22 protrudes in the vicinity of the handle base 21, and a grip portion 20 of the handle 20 is provided.
In the vicinity of a and 20a, the finger-operated sub-transmission levers 1 and 2 capable of switching the sub-transmission gears in the transmission case M without a clutch, and the tension clutch 28 in the transmission case 25 are rotated to operate. A finger-operated main clutch lever 18 for engaging and disengaging the main clutch, and side clutch levers 19L and 19R for disengaging the left and right side clutches to stop driving of the running wheels and perform a turning operation and the like are provided.

Next, the internal structure of the transmission case M will be described with reference to FIGS. First, the main transmission gear mechanism will be described.
Pulley 2 transmitted through a transmission belt 27 in the inside
9a and an input shaft 29 provided with a PTO output sprocket 29b, and a fork shaft 3 extending from the main speed change lever 22
3, a counter shaft 34 and a main transmission shaft 35 are supported in a transmission case M, and a main transmission gear 29c is slidably mounted on the input shaft 29 in the transmission case M, A fork 33a extending from the fork shaft 33 is fitted, and by operating the main transmission lever 22, the fork shaft 33 and the fork 33a are slid to slide the main transmission gear 29c. The main transmission shaft 35 is switched between forward 2nd speed and reverse 1st speed and rotated by meshing with a reverse gear 34a or a counter gear 34b fixed to the counter shaft 34. Thus, the main transmission gear mechanism is formed.

Next, the auxiliary transmission gear mechanism will be described.
The auxiliary transmission shaft 36 is supported by the transmission case M,
A sprocket 36d is fixedly mounted on the auxiliary transmission shaft 36. As shown in FIG. 6, a chain 37 is wound around a sprocket 43 provided on axles 23L and 23R supported by a transmission case M. Further, low, middle, and high speed sub-transmission gears 36a, 36b, 36c are removably engaged with the sub-transmission shaft 36 via ball clutches 38a, 38b, 38c. 36b / 36c
In addition, three sub-transmission gears 35a, 35b, and 35c of low, medium, and high speeds fixedly connected to the main transmission shaft 35 are always meshed. A shifter shaft 39 is rotatably and slidably fitted at the shaft center position of the sub-transmission shaft 36, and the shifter shaft 39 can be selectively engaged with each of the ball clutches 38a to 38c.
a is attached to the shifter shaft 39, and the shifter shaft 39 is slid so that the shifter 39a is connected to the ball clutches 38a-38.
c and is engaged with one of the auxiliary transmission gears 36a to 36c. In this way, a sub-transmission gear mechanism is formed that allows the sub-transmission shaft 36 to rotate by switching between low, medium, and high speeds. The sprocket 36d is driven by changing the rotation speed of the sub-transmission shaft 36 as described above. The rotation speed of the axles 23L and 23R that are transmitted by winding the chain 37 between the wheels 43 is changed.

A sliding operation mechanism of the shifter shaft 39 in the subtransmission gear mechanism will be described. As shown in FIG. 5, a compression spring 40 is wound around one end of the shifter shaft 39 to urge the shifter shaft 39 toward the one end, and the other end is projected outside the transmission case M. The rotation cam 42 is fixedly inserted through the center of a cylindrical fixed cam 41 attached to the outer surface of the transmission case M with its rotation restricted, as shown in FIG.
b, the end of one sub-transmission wire W extending from the sub-transmission levers 1.2 provided near the grip portion 20a of the handle 20 is pivotally connected to the sub-transmission arm 42b. Have been. The sub-transmission arm 42b is
As shown in FIG.
The auxiliary transmission wire W is urged in a direction to push the auxiliary transmission wire W from the handle 20 toward the transmission case M.

As shown in FIG. 7, the fixed cam 41 has low, medium, and high speed cam surfaces 41a, 41b, and 41c formed in multiple stages, and is opposed to the cam surface 42a of the rotary cam 42. I have. The rotating cam 42 is urged in a direction to press the fixed cam 41 by the compression force of the compression spring 40. By operating the sub-transmission levers 1 and 2, the sub-transmission wire W
By pulling or loosening the auxiliary transmission arm 42
b, and the rotating cam 42 is rotated, and the cam surface 42a is brought into contact with one of the low, middle, and high speed cam surfaces 41a to 41c of the fixed cam 41 so that the left and right position of the rotating cam 41 is changed. The shifter shaft 39 connected from the rotating cam 42 slides and the position is fixed.

The side clutch mechanism in the transmission case M will be described. As shown in FIG. 6, the axles 23L and 23R can be engaged with the sprocket 43 transmitted from the sprocket 36d of the auxiliary transmission shaft 36 via the chain 37 via the side clutches 44L and 44R as ball clutches. During traveling, the engaged axles 44L and 44R are transmitted. Both side clutches 44L and 44R are provided with an inner side clutch arm 45L.
The side clutch wires are connected to the side clutch levers 19L and 19R of the handle grip portions 20a and 45R via the outer side clutch arms 46L and 46R. When the lever is pushed upward, the side clutch wires are connected. The side clutch wire is pulled,
By rotating the side clutch arms 45 and 46 on the same side and disengaging the side clutch 44 on the same side, the transmission to the axle 23 on that side is cut off and the body turns.

Next, the auxiliary speed change levers 1 and 2 arranged near the handle grip portion 20a to perform the operation of loosening the auxiliary speed change wire W will be described with reference to FIGS. A fixed plate 3 is fixed to the handle 20, and a boss 4 is protruded from the fixed plate 3. The first rotating shaft 5 is slidably and loosely fitted to the fixed plate 3 and the boss 4. I have. On the first rotating shaft 5, a first rotating body 6 is fixedly provided at an end on the projecting side from the boss 4, and on a projecting side from the fixed plate 3 via a one-way clutch 7. A boss 1a at the base of the first sub-transmission lever 1 is provided in a loop, and the first rotary shaft 5 is engaged and rotates only when the first sub-transmission lever 1 is pressed downward in FIG. , The first rotating body 6 is rotated. Further, a spring 8 is interposed between the one-way clutch 7 and the boss 1a of the first sub-shift lever 1 on the opposite end of the first rotary shaft 5 on the side opposite to the first rotary body 6, and The driving shaft 5 is urged toward the first rotating body 6 side, and the first sub-transmission lever 1 is urged upward by the return spring 13 so that
It is fixed at a position where it comes into contact with the upper stopper 14. Thus, when the first sub-transmission lever 1 is pressed, the first rotating body 6 is configured to rotate clockwise by a fixed amount in FIG.

The fixed plate 3 has a second rotating shaft 9 protruding in parallel with the first rotating shaft 5. The second rotating shaft 9 has a second sub-transmission lever 2 base. The boss 2a is rotatably fitted to the outside, and a second rotating body 10 is fixed to an end of the second rotating shaft 9 protruding from the boss 2a.

An end of the auxiliary transmission wire W is pivotally supported at the lower end of the second rotating body 10, and the end of the auxiliary transmission wire W is urged toward the transmission case M by a spring 17;
That is, the lower end of the second rotating body 10 is urged toward the wire loosening side. On the other hand, at the upper end, detent grooves 10a, 10b, and 10c corresponding to the low speed, the medium speed, and the high speed of the gears provided by the sub-transmission gear mechanism are provided, and above the second rotating body 10, Detent member 11 from the fixing plate 3
The tip of the detent groove 10 is urged downward to press against the upper end of the second rotating body 10, and
a to 10c can be fitted. The engagement between the detent member 11 and the detent grooves 10a to 10c of the second rotating body 10 forms a ratchet.
Since the first rotating shaft 11a is located above the second rotating body 10, the direction of the detent groove 10a → 10c for pushing up the detent member 11 upward (direction of pulling of the auxiliary transmission wire W).
Can rotate the second rotating body 10, but the reverse direction (the direction in which the auxiliary transmission wire W is loosened) is a direction in which the detent member 11 fitted in the detent groove is pushed down, so that the detent The tip of the member 11 does not fall out of the detent groove, so that the second rotating body 10 cannot rotate in this direction.

The second rotator 10 and the first rotator 6 having such a configuration are adjacent to each other, and the adjacent portion is the gear portion 6a.
10d, the gears are engaged, and when the gears are engaged, the first rotating body 6 and the second rotating body 10
As shown in FIG. Therefore, each time the first sub-transmission lever 1 is pressed as described above, the second rotating body 10 rotates counterclockwise in FIG. The detent groove to be fitted to the detent member 11 is switched from 10a to 10b to 10c.

Further, a boss 2a provided with a second auxiliary transmission lever 2 is provided on a second rotating shaft 9 between the fixed plate 3 and the second rotating body 10.
Are freely rotatably fitted. The second auxiliary shift lever 2 is
The first sub-transmission lever 1 is disposed substantially parallel to the first sub-transmission lever 1 so that one of the sub-transmission levers 1 and 2 can be pressed with one finger without releasing the hand from the handle grip 5a. It is urged upward by the return spring 15 and is always pressed against and fixed to the upper stopper 16, but when pressed downward and rotated, the vicinity of the base end 2b becomes
The distal end of the detent 11 fitted in the detent grooves 10a to 10c of the second rotating body 10 is pushed up to pull out the distal end of the detent member 11 from the detent groove. Further, a clutch plate 12 extends below a middle portion of the second sub-transmission lever 2 and is always fitted on a boss 4 between the first rotating body 6 and the fixed plate 3. However, when the second sub-transmission lever 10 is pushed down, the clutch plate 12 is pushed into between the boss 4 and the first rotating body 6, and the first rotating body 6 and the first rotating shaft 5 are moved. The gear portion 6a of the first rotating body 6 and the gear portion 1 of the second rotating body 10 are slid.
0d is disengaged. That is, by the pressing and rotating operation of the second auxiliary transmission lever 2, the fitting of the detent member 11 in the second rotary body 10 and the gear mesh with the first rotary body 6 are released, and the second rotary body 10 The auxiliary transmission wire W is also urged by the spring 17 so that the lower end of the second rotating body 10 can be rotated in the loosening direction of the auxiliary transmission wire W. In other words, the detent groove facing the tip of the detent member 11 is 10c → 1
0a. Then, when the finger is released from the second sub-transmission lever 2, the second sub-transmission lever 2 returns to the initial position, the clutch plate 12 and the detent member 11 return, and the tip of the detent member 11 fits in the detent groove 10a. In other words, it is fixed at the low speed stage.

A description will be given of the operation of switching the sub-transmission by the sub-transmission lever with the above configuration. First, when performing the switching operation from the low-speed stage to the middle-speed stage and the high-speed stage, the second operation is performed in the direction in which the sub-transmission wire W is pulled. In order to rotate the rotating body 10, the first sub-transmission lever 1 is pressed with a finger, and each time the pressing is performed, a low speed
Medium speed can be switched to high speed. When lowering the speed from the state where the gear is shifted to the high gear to the low gear,
Is pressed by a finger, the second rotating body 10 is rotated at a stretch in the loosening direction of the sub-transmission wire W to enter the low speed stage. In this way, the gear can be switched in the order of low speed → medium speed → high speed → low speed → medium speed → high speed → low speed by the pushing operation of the first sub speed lever 1 and the second sub speed lever 2 with the fingers. It is possible to perform a speed change operation to quickly drop to a low gear.

[0020]

The present invention is configured as described above.
The following effects are obtained. That is, the first speed change lever and the second speed change lever, both of which can be operated with only one finger pressing operation, are disposed near the handle grip portion, and the speed change wire is pulled by the first speed lever pressing operation. In addition, since the shift wire can be operated to the loosening side by the pressing operation of the second shift lever, a single shift operation from a high speed stage to a low speed stage becomes possible, thereby improving work efficiency and safety. .

[Brief description of the drawings]

FIG. 1 is an overall side view of a management work machine.

FIG. 2 is an overall plan view of the same.

FIG. 3 is a side view of the finger-operated shift lever mechanism of the present invention.

FIG. 4 is a plan sectional view of the same.

FIG. 5 is an internal front view of the mission case.

FIG. 6 is an internal front view of the axle suspension portion.

FIG. 7 is a front partial cross-sectional view of the auxiliary transmission gear switching mechanism.

FIG. 8 is a partial side view of the transmission case M.

[Explanation of symbols]

 W auxiliary transmission wire 1 first auxiliary transmission lever 2 second auxiliary transmission lever 3 fixing plate 4 boss 5 first rotating shaft 6 first rotating body 6a gear unit 7 one-way clutch 8 spring 9 second rotating shaft 10 second rotation Body 10a Detent groove 10b Detent groove 10c Detent groove 10d Gear part 11 Detent member 12 Clutch plate 13 Return spring 14 Upper stopper 15 Return spring 16 Upper stopper 17 Spring 20 Handle 20a Grip part

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A 4-113224 (JP, U) JP-A 7-5304 (JP, U) JP-A 5-1554 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) A01B 33/08 B60K 23/02 G05G 7/00

Claims (1)

(57) [Claims] 1. A first rotating body is pivotally supported via a one-way clutch in the vicinity of a handle grip portion of a management work machine,
A gear meshes with the first rotator to pivotally support a second rotator connecting the transmission wire end, and allows the second rotator to rotate only by gear engagement with the first rotator. A ratchet is provided, a first transmission lever is attached to the first rotating body, the first rotating body can be rotated by a pressing operation of the first transmission lever, and a second rotating body is provided to the second rotating body. A shift lever is attached, the ratchet of the second rotating body is released by the pressing operation of the second shifting lever, and the gears of both rotating bodies are disengaged. A finger-operated shift lever of a management work machine, wherein the shift lever is rotatable in a direction opposite to a rotation allowable direction due to gear engagement with a rotating body.