JPS62447Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention links a speed change operation member to the movable conical disk of a split pulley around which a transmission belt is wound, and also brings a tension clutch pulley into pressure contact with the transmission belt, so that the tension This invention relates to a belt-type continuously variable transmission in which a clutch pulley and a foot pedal for power interruption are interlocked and connected via a mechanical linkage mechanism.

Conventionally, in order to connect the tension clutch pulley and the foot pedal in the above device, a rod is generally used and a long hole or the like is provided in the middle of the connection.
While allowing the tension clutch pulley to be displaced as the gear changes, the foot pedal is maintained at a constant position without being operated.

However, due to the flexibility, there is some play in the operation of the foot pedal, and the amount of play fluctuates as the gears are changed, making it impossible to disengage the tension clutch pulley unless the foot pedal is depressed at a constant stroke. Ta.

In view of the above points, the present invention enables the tension clutch pulley to be quickly disengaged and operated with the minimum necessary stroke from that position while maintaining the foot pedal in a fixed position without being operated. The purpose is to

In order to achieve the above object, the present invention provides the above-mentioned belt-type continuously variable transmission, in which the mechanical linkage mechanism is constructed from a wire, and a contact member that contacts the middle of the linkage wire is provided. In order to operate the abutment member in a direction to take up the slack in the linking wire between the tension clutch pulley and the foot pedal that occurs with the speed change operation of the speed change operation member, the speed change operation member and the abutment member are connected to each other by an interlocking member. It is characterized by being interlocked and connected through.

In other words, regardless of whether or not the gear shift is being operated, the wire that serves as a mechanical linkage mechanism that links the foot pedal and the tension clutch pulley is always maintained in a tensioned state to eliminate any play in the linkage mechanism. While maintaining the pedal at a constant position, as the pedal is operated, the switching force is transmitted from that position to the tension clutch pulley, regardless of whether the gear shift operation is high or low.
It has become possible to quickly disconnect the tension clutch pulley with the minimum necessary stroke in each state.

Hereinafter, embodiments of the present invention will be described in detail with reference to illustrative drawings.

An engine 4 is mounted on the front part of a running vehicle body on which wheels 1 and 2 are mounted on front and rear wheels and a control section 3 is arranged.
On the other hand, a seedling planting device 6 is connected to the rear via a link mechanism 5.
The two are linked together so that they can be raised and lowered to form a riding rice transplanter.

In order to transmit the power from the engine 4 to the front and rear wheels 1, 2 and the seedling planting device 6, the power is transmitted from the engine 4 to the transmission 7 via a belt type continuously variable transmission 8, and from the transmission 7 to the front and rear wheels 1, 2, and the seedling planting device 6. 2,
Further, the power is transmitted from the transmission 7 to the seedling planting device 6 via the power take-off shaft 9 and the transmission shaft 10, respectively.

To configure the transmission 8, a split pulley 12 is attached to the engine output shaft 11, and a transmission belt 15 is wound around the split pulley 12 and a pulley 14 mounted on the transmission input shaft 13. A tension clutch pulley 16 is applied to the transmission belt 15.

The movable conical disk 17 of the split pulley 12 and the lever portion 18 protruding from one link 5a constituting the link mechanism 5 are connected to the two push/pull rods 19a, 19b, the bell crank 19c and the gear shifter. The seedling planting device 6 is interlocked and connected via the operating member 20.
As the vehicle moves up and down, the speed increases while planting, and
When turning on a headland, etc., the vehicle is configured so that the speed is naturally lowered in a non-working state where the vehicle is raised higher.

To configure the split pulley 12, a fixed conical disc 21 is rotatably attached to the end of the engine output shaft 11, and a movable conical disc 21 is attached to the output shaft 11 on the engine 4 side from the fixed conical disc 21. Board 17
It is installed so that it can slide freely.

The tension clutch pulley 16 and the foot pedal 22 are interlocked and connected via a wire 24 as a mechanical linkage mechanism, with a guide roller 23 interposed between them for direction change, to raise and lower the seedling planting device 6. When shifting gears in conjunction with , the tension clutch pulley 16 is constantly displaced toward the tension side of the belt 15 by the spring 25 attached to it, but the tension is moved against the biasing force of the spring 25 by pressing the pedal 22 . The clutch pulley 15 is moved to the slack side, and the power transmission from the engine 4 to the transmission 7 is cut off.

A support arm 26 is provided protruding from a midway point in the longitudinal direction of the vertical rod 19b, which serves as an interlocking member directly connected to the speed change operation member 20 of the push/pull rods 19a and 19b, and is freely rotatably connected to the support arm 26. A guide roller 27 as this member is mounted on an axis and acts from above the wire 24,
The tension mechanism 28 is configured to eliminate slack in the wire 24 due to displacement of the tension clutch pulley 16 during gear shifting, that is, to eliminate play in the linkage mechanism between the foot pedal 22 and the tension clutch pulley 16. .

Therefore, in a low speed state, the transmission is cut off with a smaller stroke than in a high speed state, so that the transmission can be cut off with the minimum necessary operating stroke.

A body frame 30 is provided protruding forward from the front part of the bonnet 29, and a support column 3 is attached to the body frame 30 so as to be rotatable around the vertical axis Q and fixed at a predetermined position by a ball stopper or the like (not shown).
1, and on its support 31, there are 2
A set of spare seedling mounting tables 32... are arranged in series, and by rotation thereof, it is possible to easily replenish or take out the spare seedlings from a desired position. There is.

Incidentally, in carrying out the present invention, the wire 2
Attach a plate member to the middle of 4, and attach the plate member to the middle of output shaft 1.
A contact member is provided so that the tension clutch pulley 16 comes into contact with the plate member in a state where the tension clutch pulley 16 is displaced to a position immediately after the power transmission from 1 to the input shaft 13 is cut off, and the contact member is provided with a plate member. A biasing mechanism such as a spring is attached to bias the tension clutch pulley 16 to displace it toward the engagement operation side, and as the tension clutch pulley 16 is operated to the disengaged position, the operating force applied to the foot pedal 22 is increased. It may be configured so that it can be easily determined by the feeling of operation through the foot that the tension clutch pulley 16 has reached the cut position.

The present invention is applicable not only to rice transplanters but also to agricultural machinery such as combines and various other working devices.

[Brief explanation of the drawing]

The drawings show an embodiment of the belt-type continuously variable transmission device according to the present invention, and FIG. 1 is an overall side view of the rice transplanter, and FIG.
The figure is a perspective view of the transmission, Figure 3 is a mechanical diagram of the main part showing the phases of the tension clutch pulley developed, Figure 4 is an enlarged sectional view showing the split pulley, and Figure 5 is a plan view of the main part. It is a diagram. 6... Seedling planting device, 12... Split pulley, 15
...Transmission belt, 16...Tension clutch pulley, 17...Movable conical disk, 19b...Interlocking member, 20...Speed change operation member, 22...Foot pedal, 24...Mechanical linkage mechanism, wire, 28...
...Abutment member.

Claims (1)

[Claims for Utility Model Registration] A speed change operation member 20 is linked to a movable conical disc 17 of a split pulley 12 around which a transmission belt 15 is wound, and a tension clutch pulley 16 is pressed into contact with the transmission belt 15. A belt type continuously variable transmission in which the tension clutch pulley 16 and the foot pedal 22 for power interruption are interlocked and connected via a mechanical linkage mechanism 24, and the foot pedal 22 is maintained at a constant position without being operated. The device includes a mechanical linkage mechanism 24 made of a wire, and a contact member 2 that comes into contact with the linkage wire 24 midway.
7, and the abutment member 27 is operated in a direction to take up the slack in the linking wire 24 between the tension clutch pulley 16 and the foot pedal 22 that occurs when the speed change operation of the speed change operation member 20 is performed. A belt type continuously variable transmission characterized in that a member 20 and a contact member 27 are interlocked and connected via an interlocking member 19b. The speed change operation member 20 and the seedling planting device 6 are interlocked and connected so that the speed change operation member 20 is operated to a low speed side as the seedling planting device 6, which is provided on the traveling machine body so as to be able to move up and down by a drive, is raised. A belt-type continuously variable transmission device according to the scope of claims for utility model registration.