JPS633488Y2 - - 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 a transmission operation device which also serves as a clutch function and is linked to a brake device.

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 such a device, if you want to stop the Taylor while it is running in an emergency, you must first disengage the clutch, then apply the brakes, and then switch the gear shift control lever to the lowest speed position in preparation for the next run. It is necessary to perform many operations, which are very troublesome, and if the brakes are suddenly applied without performing the above-mentioned necessary operations, the engine stalls. In addition, as another type of belt-type transmission that has a gear shift operation device that also has a clutch function, there is a double tension type transmission. In connection with this, there is also a type of transmission device in which when the brake is activated, a one-touch operation of the interlocking disconnection lever immediately returns the transmission control lever to the neutral position and cuts off power transmission in an emergency or the like.
This mechanism had the drawback that not only could the speed be changed between only two types (high and low), but the connection mechanism for the speed change operation lever, disconnection lever, and brake lever was 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 shift operation lever can be sequentially locked in a number of 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 shift operation lever of the lever guide plate A lever push plate is slidably provided adjacent to the locking groove at the operating position, and the lever push plate is operated by operating a cutting lever disposed on the handle portion, thereby moving the lever to an arbitrary shift operation position. A type in which a certain speed change operation lever is pushed out of a locking groove of a lever guide plate and returned to a power cutoff position, and the cutoff lever is stably held in two positions: a brake off position and a brake on position. linked to the brake lever of
When the brake lever is rotated to the brake-on position, the disconnection lever is configured to hold the shift operation lever in an operating state that returns the shift operation lever to the power cutoff position. In addition to making it possible to operate a large number of gear shifting states and power cutoff states, the gearshift operating lever, disengagement lever, and brake lever are linked, so that in an emergency, etc., simply by operating the disengagement lever or brake lever, the shift operating lever can be operated. To provide a transmission device for a mobile agricultural machine which eliminates the above-mentioned drawbacks with a simple mechanism by immediately returning the speed change operation lever to the power cutoff position no matter what speed change operation position it is at.

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. The structure is such that no power is transmitted to the belt 12 through 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.

A lever guide plate 26 is fixed to the handle portion 6 via a mounting bracket 25, as shown in FIGS. 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. Further, near the right end of the lever push plate 33, an erroneous operation prevention plate 37 is biased clockwise by a torsion spring 40 using a pin 39 as a rotational fulcrum, and normally its active end 37a is attached to the lever guide plate 26. The operating end 37a is provided so as to be lightly abutted against a stopper 41 provided therein, and the operating end 37a closes the guide groove 2 between the locking groove 26h and the locking groove 26i only when the lever pushing plate 33 is pushed out.
It is designed to protrude at 6c. Cutting lever 3
5 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, as shown in FIG. The shaft member 4 is erected on the mounting part 42 as shown in FIGS. 6a and 6b.
3, the other end of which is rotatably fitted to the aforesaid shaft 27, as shown in detail in FIGS. 4b and 4c. It is fixed to the member 29b. and,
A return spring 36 is stretched between the cutting lever 35 and the lever guide plate 26.
is normally pulled upwards as shown by the solid line in FIG.
The lever push plate 33 is held in the retracted state from the locking grooves 26d to 26h by the engagement action of the lever a. Further, a brake lever 45 of a type that is stably held in two positions, a brake disconnection position and a brake on position, is pivotally connected to the shaft member 43 to which one end of the disconnection lever 35 is pivotally connected via a wire W. The operating end 45a of the brake lever 45 moves against the spring 36 when the brake lever 45 is engaged.
It is designed to rotate and hold in the operating state.

Since the present embodiment has the above-described configuration, when the tailor 1 is normally traveling, the appropriate locking grooves 26d to 26c of the shift operation lever 30 are located along the guide groove 26c of the lever guide plate 26 at the shift operation position from high speed to low speed. 2
When the shift control lever 30 is rotated to a position corresponding to 6h, the movable cam 15 is rotated via the wire 17 and the lever portion 15a in accordance with the rotation position of the shift operation lever 30.
The movable cam 15 is connected to the output shaft 5a relative to the fixed cam 20.
The movement of the movable sheave 10b causes the fixed sheave 10a and the movable sheave 10b to be moved by overcoming the spring 23 of the driven pulley 11.
The fixed sheave 11a of the driven pulley 11 is determined by the returning force of the spring 23.
and the movable sheave 11b are also determined, and the position of the belt 12 between the driving pulley 10 and the driven pulley 11 is determined.
The power from is transmitted after being changed in speed. In order to maintain this state, the desired locking grooves 26d to 26 are
When you release your hand from the shift control lever 30 at the position corresponding to h, 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, the gears are locked in the desired locking grooves 26d to 26h, so that 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 speed change state, normally the speed change operation lever 30 is moved against the spring 31 as shown by the chain line in FIG. 4c.
Then, while keeping the same position, rotate the gear shift operating lever 30 along the guide groove 26c toward the locking groove 26i corresponding to the power cutoff position, and at that position, remove your hand from the gear shift operating lever 30. Just let go. 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 drive side pulley 1
0, the distance between the movable sheave 10b and the fixed sheave 10a becomes maximum, and the belt 12
Since the output shaft 5a is released from contact with the output shafts 5a and 10b and is placed on the holder 22, the rotation from the output shaft 5a only rotates the bearing 21 and is not transmitted to the holder 22. Therefore, no power is applied to the belt 12. is not transmitted. 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 out 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 advancement of the lever push plate 33, so the gear shift operating 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 causes the operating end 37a of the malfunction prevention plate 37 protruding so as to close the guide groove 26c torsion as the lever pushing plate 33 advances. 40, the spring 3 is moved toward the locking groove 26i at the power cutoff position, where the spring 3
1, it is securely locked in the locking groove 26i. In the above case, if you let go of the cutting lever 35, the cutting lever 35 is immediately pulled up by the spring 36, and the lever pushing plate 33 is withdrawn from the locking grooves 26d to 26h, so that the shift operation lever 30 can be rotated to the desired shift position immediately thereafter. Also, in an emergency,
If it is necessary to immediately stop the travel of Taylor 1 in preference to cutting off the power, it is sufficient to rotate only the brake lever 45 from the solid line position to the broken line position, as shown by the arrow in FIG. 6b. Then, the brake lever 45 is held in the brake applied state, and its working end 45a abuts the disconnection lever 35 to maintain the disconnection lever 35 in the activated and rotated state. is moved to the power cut-off position and locked, and the tailor 1 is immediately stopped without any engine stalling. In this case, unless the brake lever 45 is returned to the disconnected state as described above, the brake lever 35
is in the operating state, the lever push plate 33 continues to advance toward the locking grooves 26d to 26h, and therefore the operating end 3 of the malfunction prevention plate 37
7a is the guide groove 26 as shown by the broken line in FIG. 5a.
Even if an attempt is made to move the shift operating lever 30 which is in the power cutoff position by mistake, the operating end 37a contacts the stopper 39 and prevents the shift operating lever 30 from moving in the direction of the shift operating position. Therefore, transmission of power due to a speed change operation while the brake is in operation is prevented, and damage to the brake device, power transmission device, etc. is prevented.

Although the brake lever 45 has been described as being for use as an emergency stop brake for the Taylor 1, the brake lever 45 is used to stop the Taylor 1 from the engine 5.
Of course, it can also be used as a parking brake for leaving the brake in a temporarily stopped state while it is activated.

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 uses 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 as a speed change mechanism, so that one speed change is possible. Operation lever 3
A number of speed change operations from high speed to low speed can be performed by a rotational operation of 0, and the same speed change operation lever 30 can also be used to perform a power cutoff state, that is, a clutch action. Locking groove 26 located at the shift operation position of the guide plate 26
A lever push plate 33 is disposed adjacent to d to 26h, and the lever push plate 33 is actuated by operating a disconnection lever 35 provided near the handle portion 6, thereby shifting the gear at any shift operation position. The operating lever 30 is inserted into the locking grooves 26d to 2 of the lever guide plate 26.
Push out from 6h and lock groove 26i at power cutoff position
Since it is configured so that it can be returned to
5, the speed change operation lever 30 is quickly returned to the lock groove 26i at the power cutoff position even when the speed change operation lever 30 is locked in any of the lock grooves 26d to 26h at the speed change operation position. I can do it. Further, the disconnection lever 35 is interlocked with a brake lever 45 of a type that is stably held in two positions, a brake disconnection position and a brake engagement position,
When the brake lever 45 is rotated to the brake-on position, the disconnection lever 35 is kept in the operated state, so when it is necessary to stop the Taylor 1 in an emergency, only the brake lever 45 can be engaged. By simply rotating the tailor 1 to the position, not only will the tailor 1 be stopped immediately, but the cutting lever 35 will also be stopped at the same time.
is continuously maintained in an operating state, so that stalling of the engine when the tailor 1 is stopped is avoided. Furthermore, if a malfunction prevention plate 37 is added to the lever push plate 33, when the Taylor 1 is stopped due to the operation of the brake, the shift operation lever 30
It is possible to prevent the shift lever from being inadvertently moved to the shift operation position.

[Brief explanation of drawings]

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. Figure 3 is a side view of the same transmission mechanism, Figures 4 a, b, and c are partial side views a, partial plan view b, and partial front view c showing the gear shift operation lever in the handle, and Figures 5 a, b, and c. 6A and 6B are a plan view a showing the lever push plate in relation to the lever guide plate, a side view b and an explanatory view c of the operation of the malfunction prevention plate, and FIGS. 6a and 6b are parts of the handle portion showing the brake lever. They are a plan view a and a partial side view b. 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...disconnection lever, 45...brake lever.

Claims (1)

[Scope of utility model registration request] In the mobile agricultural machine 1 in which the rotation of the engine 5 is transmitted to the transmission mechanism 9 via a transmission mechanism operated by a transmission operation lever 30, the transmission operation lever 30 is connected to a plurality of locks provided on the lever guide plate 26. The grooves 26d to 26i are configured to sequentially engage a large number of shift operation positions from high speed to low speed and a power cutoff position, and the shift mechanism is configured to be locked at each of the shift operation positions of the shift operation lever 30. The belt type continuously variable transmission mechanism 7 is capable of changing between a speed change state and a power cutoff state, and a locking groove 26 corresponding to the speed change operation position of the lever guide plate 26 is provided.
A lever push plate 33 is slidably provided adjacent to d to 26h, and the lever push plate 33 is actuated by operating a disconnection lever 35 disposed on the handle portion 6, and the shift operation lever 30 in the shift operation position is operated. It is configured to be pushed out from the locking grooves 26d to 26h of the lever guide plate 26 and returned to the power cutoff position, and furthermore, the cutoff lever 35 is stably held in two positions, the brake cutoff position and the brake on position. When the brake lever 45 is rotated to the brake on position in conjunction with the brake lever 45 of the model,
A speed change operation device for a mobile agricultural machine 1 configured such that a cutoff lever 35 is maintained in an operating state that returns a speed change operation lever 30 to a power cutoff position.