JPS633487Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission device for a mobile agricultural machine, particularly a tailor, and more particularly to an operating device for a belt type continuously variable transmission having a speed change operating device that also serves as a clutch function.

Generally, in a Taylor, a belt-type continuously variable transmission mechanism is provided between the output shaft of the engine and the main shaft of the transmission as a mechanism for transmitting the rotational output from the engine to the wheels, and the transmission mechanism is used to change the speed. A device is used that is actuated by rotating an operating lever to transmit power, and in this device, a clutch device is installed in relation to the main shaft of the transmission, for example, when the clutch is placed in a neutral state. The clutch device was disengaged to prevent rotational output from the engine from being transmitted to the wheels. However, with this type of device, if you want to stop the Taylor while it is running or leave it in a temporarily stopped state, you must first disengage the clutch, then apply the brakes as necessary, and then operate the gearshift. It is necessary to perform many operations such as switching the lever to the lowest speed position in preparation for the start of the next run, which is very tedious and often leads to operational errors such as forgetting to change the shift operation lever as described above. There was a drawback. Another type of belt-type transmission that has a gear shift operating device that also has a clutch function is the double tension type. There is also a type of transmission that immediately returns the gear shift control lever to the neutral position in an emergency to cut off power transmission, but due to its mechanism, this type of gear can only switch between high and low gears. The disadvantage is that the connection mechanism between the operating lever and the disconnection lever is extremely complicated.

Therefore, the present invention applies a belt-type continuously variable transmission mechanism that can change individual speed states corresponding to multiple operating positions of the speed change operation lever and a power cutoff state by using the same speed change operation lever. ,
The gear shift operation lever can be sequentially locked in a large number of gear shift operation positions from high speed to low speed and a power cutoff position by a large number of locking grooves provided on the lever guide plate, and the gear shift operation lever of the lever guide plate is A lever push plate is slidably provided adjacent to the position locking groove, and the lever push plate is actuated by operating a cutting lever disposed on the handle portion, whereby the gear shift operation position is set at an arbitrary position. The gear shift operation lever is configured to be pushed out of the locking groove of the lever guide plate and returned to the power cut-off position, so that a single gear shift operation lever can be operated to a large number of shift states and power cut-off states. In addition, the gear shift operating lever and the disconnection lever are linked to each other, so that in an emergency or the like, no matter what shift operating position the gear shift operating lever is in, the shift operating lever can be immediately returned to the power cutoff position with a one-touch operation. The object of the present invention is to provide a transmission device for a mobile agricultural machine that eliminates the above-mentioned drawbacks with a simple mechanism.

Embodiments of the present invention will be described below with reference to the drawings.

The tailor 1 has wheels 2 as shown in FIG. 1a.
It has a fuselage 3 supported by a
The engine 5 is installed in the front of the aircraft, and the aircraft 3
A handle portion 6 is disposed at the rear of the handle portion 6. The power of the engine 5 is transmitted from the output shaft 5a to the main shaft 9a of the transmission 9 via the belt-type continuously variable transmission mechanism 7, and further to the wheels 2.

As shown in FIGS. 2 and 3, the belt type continuously variable transmission mechanism 7 includes a driving pulley 10, a driven pulley 11, and a belt 12 wound around both of these pulleys 10 and 11. The side pulley 10 is attached to the output shaft 5a of the engine 5, and the driven pulley 11 is attached to the main shaft 9a of the transmission 9. And drive side pulley 1
0 has a fixed sheave 10a and a movable sheave 10b, and the fixed sheave 10a has a boss fixed to the output shaft 5a at the tip side of the output shaft 5a, that is, on the outside of the fuselage 3. Further, the movable sheave 10b is located on the body 3 side and is slidably fitted to the output shaft 5a via the sleeve member 13, and is connected to the movable cam 15 via a bearing 16. Further, the movable cam 15 connects a wire 17 extending to the handle portion 6 of the tailor 1 to its lever portion 15a, and engages a fixed cam 20 fixed to the mounting bracket 19. The cams 15 and 20 constitute an operating cam section of the continuously variable transmission mechanism 7. In addition, the movable sheave 10
A holder 22 having a built-in bearing 21 is disposed on the fixed sheave 10a side of the sleeve member 13 to which the movable sheave 10a is attached.
The belt 12 separates from both sheaves 10a and 10b and is placed on the holder 22 with the belt 12 separated from the fixed sheave 10a to the maximum extent possible, thereby removing the drive pulley 10 from the output shaft 5a. It is configured such that no power is transmitted to the belt 12 via the belt 12. On the other hand, the driven pulley 11 also has a fixed sheave 11a and a movable sheave 11b.
The movable sheave 11b is located outside the body 3, and is urged by a spring 23 in a direction toward the fixed sheave 11a.

As shown in FIGS. 1a and 1b and in detail in FIGS. 4 a to c, a lever guide plate 26 is fixed to the handle portion 6 via a mounting bracket 25, and its side plates 26a, 26b A shaft 27 is disposed between them, and a shift operating lever 30 is attached to a sleeve member 29a rotatably fitted to the shaft 27 so as to be able to swing in the axial direction of the shaft 27. The aforementioned wire 17 is connected to the tip of the shift operation lever 30, and a spring 31 is stretched between the tip of the shift operation lever 30 and the sleeve member 29a. As shown by the solid line in FIG. 4c, the lever guide plate 26 is constantly biased in the direction in which it can be locked in the locking grooves 26d to 26i. Further, a lever guide groove 26c is carved on the upper surface of the lever guide plate 26, and within the guide groove 26c is a locking groove that can lock the speed change operation lever 30 in a number of speed change operation positions from high speed to low speed. 26d, 26e, . . . 26h, and a locking groove 26i that can similarly lock the speed change operation lever 30 in the power cutoff position. Furthermore, a pair of guide frames 32, 32 are provided upright from the side plate 26b below the guide groove 26c of the lever guide plate 26. Stop groove 26d~26h
A lever push plate 33 in the shape of a flat rectangle as shown in FIGS. 5a and 5b is provided which slides in and out of the direction, and an oblique elongated hole 33a is provided in the center thereof as shown in FIG. 5a. A cut lever 3 is installed there.
The working end portion 35a of No. 5 is fitted into the opening. As shown in FIG. 1b as a whole, the cutting lever 35 is provided over the entire width of the inside of the handle part 6 so that it can be operated from any part of the handle part 6, and has one end thereof. The part is rotatably pivoted to the handle part 6, etc., and the other end is rotatably fitted to the shaft 27, as shown in FIGS. 4b and 4c. The sleeve member 29b is fixed to another sleeve member 29b. A return spring 36 is stretched between the cutting lever 35 and the lever guide plate 26, and the cutting lever 35 is normally pulled upward as shown by the solid line in FIG. Due to the engagement between the portion 35a and the oblique hole 33a, the lever push plate 33 is held in a retracted state from the locking grooves 26d to 26h.

Since the present embodiment has the above-described configuration, when the Taylor 1 is normally traveling, the shift operation lever 30 moves along the guide groove 26c of the lever guide plate 26 to the appropriate locking groove 26d from the high speed to low speed shift operation position. ~
26h, the movable cam 15 is rotated via the wire 17 and the lever part 15a according to the rotation position of the shift operation lever 30, and the movable cam 15 is rotated with respect to the fixed cam 20. is the spring 23 of the driven pulley 11 along the output shaft 5a.
Since the movable sheave 10 is moved by overcoming
By moving b, the fixed sheave 10a and the movable sheave 1
0b is determined, and the fixed sheave 1 of the driven pulley 11 is determined by the return force of the spring 23.
1a and the movable sheave 11b is also determined, and the position of the belt 12 between the driving pulley 10 and the driven pulley 11 is determined. power is shifted and transmitted. In order to maintain this state, the desired locking groove 26d is
When the user releases the shift control lever 30 at a position corresponding to 26h, the shift control lever 30 is rotated by the return force of the spring 31 from the state shown by the chain line in FIG. 4c to the state shown by the solid line. As shown in FIG. 4a, since the gears are locked in the desired locking grooves 26d to 26h, the desired speed change state is maintained in that state. In order to cut off the power transmission to the wheels 2 from the above-mentioned shift state, normally the shift operation lever 30 is tilted against the spring 31 as shown by the chain line in FIG. In this state, the shift operating lever 30 may be rotated along the guide groove 26c toward the locking groove 26i corresponding to the power cutoff position, and the user may release the shift operating lever 30 at that position. Then, the speed change operation lever 30 is locked in the locking groove 26i by the action of the spring 31 as described above, and at this time, the belt 12 is moved by the spring 23 of the driven pulley 11 in accordance with the blocking position of the speed change operation lever 30. Due to the pushing up action, the distance between the movable sheave 10b and the fixed sheave 10a of the driving pulley 10 becomes maximum, and the belt 12 moves between both sheaves 1.
The holder 22 is released from contact with 0a and 10b.
Since it is placed on the belt 12, the rotation from the output shaft 5a only rotates the bearing 21 and is not transmitted to the holder 22, so that no power is transmitted to the belt 12. When it is necessary to quickly cut off power transmission in an emergency, etc., without operating the gear shift operation lever 30, only the direct cutting lever 35 is operated against the spring 36, as shown by the solid line in FIG. 4a. All you have to do is rotate it from the position shown by the chain line. Then, the operating end 35a of the cutting lever 35 pushes the lever push plate 33 through the oblique elongated hole 33a toward the locking grooves 26d to 26h at the shift operation position, so that it is not engaged with the locking grooves 26d to 26h. The gear shift operation lever 30 is a lever push plate 3.
3, it is pushed out from the locking grooves 26d to 26h. At that time, the locking grooves 26d to 2
At 6h, the locking grooves 26d to 26h are removed due to the advance of the lever pushing plate 33, so the gear shift operation lever 30 becomes free, and therefore the wire 17, movable cam 15, and movable sheave 10b are removed.
is also in the free state, so the driven pulley 1
Movable sheave 11 by spring 23 provided in 1
As the belt 12 moves toward the machine body 3, the belt 12 is pushed up in the maximum diameter direction toward the driven pulley 11, and accordingly, the movable sheave 10b of the drive pulley 10
is operated to move away from the fixed sheave 10a,
As described above, the belt 12 is placed on the holder 22, and power is no longer transmitted to the belt 12 from the output shaft 5a. With the operation of the movable sheave 10b, the shift operation lever 30 in the free state is moved toward the locking groove 26i at the power cutoff position, and there, by the tensile action of the spring 31, it is firmly attached to the locking groove 26i. It is locked. In addition, in the above case, if you let go of the disconnection lever 35,
The cutting lever 35 is immediately pulled up by the spring 36, and the lever pushing plate 33 is moved into the locking groove 26d~
Since you will be leaving from 26h, shift operation lever 30
can be rotated to the desired shift position immediately thereafter.

As explained above, according to the present invention, the gear shift operation lever 30 can be moved between a large number of shift operation positions from high speed to low speed and a power cutoff position by the multiple locking grooves 26d to 26i provided in the lever guide plate 26. It has a structure that can be locked sequentially, and a belt-type continuously variable transmission mechanism 7 that can take individual speed change states and power cutoff states corresponding to the speed change operation position of the speed change operation lever 30 is applied as the speed change mechanism, so that only one By rotating the speed change operation lever 30, multiple speed changes from high speed to low speed can be performed, and the same speed change operation lever 30 can also be used to perform a power cutoff state, that is, a clutch action. Furthermore, a lever push plate 33 is disposed close to the locking grooves 26d to 26h at the gear shift operation position of the lever guide plate 26, and the lever push plate 33 is disposed on the handle portion 6 of the cutting lever 35. By operating the gear shift operation lever 30 at an arbitrary shift operation position, the gear shift operation lever 30 can be moved into the locking groove 26d of the lever guide plate 26.
Locking groove 26 at the power cutoff position by pushing out from 26h
Since the configuration is configured such that the shift lever 35 can be returned to position i in an emergency, the shift operation lever 30 can be quickly moved even if the shift operation lever 30 is locked in any of the locking grooves 26d to 26h at the shift operation position. The locking groove 26i can be returned to the locking groove 26i at the power cutoff position.

[Brief explanation of the drawing]

Figures 1a and b are an overall side view a and a plan view b of the handle portion of a tailor to which the present invention can be applied, and Figures 2 are a cross-sectional plan view of a belt type continuously variable transmission mechanism to which the present invention is applied. 3 is a side view of the same transmission mechanism, FIGS. 4a, b, and c are partial side views a, partial plan view b, and partial front view c showing the speed change operation lever in the handle part, and FIGS. 5a, b, and c are These are a plan view a, a side view b, and a front view c of the lever push plate. 1... Mobile agricultural machine (Taylor), 5... Engine,
6... Handle portion, 7... Belt type continuously variable transmission mechanism, 9... Mission, 9a... Main shaft, 26...
Lever guide plate, 26d to 26i...Latching groove, 3
0... Speed change operation lever, 33... Lever push plate,
35...Disconnect lever.

Claims (1)

[Scope of utility model registration request] In a mobile agricultural machine 1 in which the rotation of an engine 5 is transmitted to a transmission 9 via a speed change mechanism operated by a speed change lever 30, the speed change lever 30 is configured to be capable of being sequentially locked at a number of speed change positions from high to low speed and at a power cut-off position by a number of locking grooves 26d to 26i provided on a lever guide plate 26, and the speed change mechanism is a belt-type continuously variable transmission 7 that can take individual speed change states and a power cut-off state corresponding to the speed change positions of the speed change lever 30, and the locking grooves 26d to 26i corresponding to the speed change positions of the lever guide plate 26 are configured to be capable of being sequentially locked at a number of speed change positions from high to low speed and at a power cut-off position.
A lever pusher plate 33 is slidably provided adjacent to engagement grooves 26d to 26h, and the lever pusher plate 33 is actuated by operating a cut-off lever 35 disposed in the handle portion 6, thereby pushing the gear shift lever 30, which is in the gear shift operation position, out of the engagement grooves 26d to 26h of the lever guide plate 26 and returning it to the power cut-off position.