JPH0218819Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clutch connection/disconnection device that connects/disconnects a clutch in conjunction with the operation of a gear shift lever.

2. Description of the Related Art In a riding working machine such as a riding lawn mower, a clutch is configured to engage and disengage in conjunction with the operation of a gear shift lever in order to facilitate gear shifting operations while driving.

By the way, since it is necessary to keep the amount of clutch disengagement constant, it is desirable to provide a stopper for regulating the stroke of the clutch release lever. On the other hand, since it is necessary to ensure transmission switching, a certain margin is provided for the swing stroke of the gear shift lever.

Therefore, if a stopper is to be provided for the release lever of the clutch, it is necessary to take measures to absorb the extra stroke of the gear shift lever.

This idea was created in view of the above circumstances.
The object is to provide a clutch connection/disconnection device equipped with a lost mechanism capable of absorbing the extra stroke of the gear shift lever during gear shifting operation and making the stroke of the clutch release lever constant.

In order to achieve such an object, the present invention provides a clutch connection/disconnection device that connects and disconnects a clutch in conjunction with the operation of a gearshift lever, in which a rotatable support shaft is provided, and the gearshift lever is attached to the support shaft. The arm to be engaged is pivotably supported, the release lever of the clutch and the intermediate portion of the support shaft are interlocked and connected by a clutch rod, and the arm is engaged with the clutch rod to maintain a fixed amount of rotation of the support shaft. A restricting stopper member is provided. On the other hand, a branch is provided protruding from the end of the support shaft and the arm side end, and a link member and a tension spring are interposed between the two branch pieces. A long hole was provided in the connecting part.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing the operation of a gear shift lever and a brake pedal.

The gear shift lever 1 is swingable in directions orthogonal to each other via shafts 3 and 4, and the swing around the shaft 4 is transmitted into the transmission case 7 via a change rod 5 and a change arm 6. F1, F2, F3, F depending on the swing angle of the surrounding gear shift lever 1
4, a speed ratio of 5 forward speeds of F5 and 1 reverse speed R is obtained, and the shift pattern 8 includes a guide groove 81 perpendicular to the shaft 4 and a plurality of engagement grooves 82 perpendicular to this groove.
... are formed, one of which is a neutral position N.

A long support shaft 10 parallel to the other shaft 3 is rotatably supported by a bracket 9, and an arch-shaped arm 15 is rotatably supported at both ends of the support shaft 10. The arm 15 corresponds to the swing locus of the roller 2 attached to the intermediate portion of the speed change lever 1. A clutch wire 21 is connected to one end of this arm 15, and the wire 21 is connected to a brake pedal 22 which also serves as a clutch pedal.

A brake rod 23 connected to the brake of the drive wheel is connected to the brake pedal 22 through an elongated hole 22a, and a tension spring 24 is connected to the pedal 22 and the rod 23.
is tensioned, and its spring force causes the rod 23 to
is biased toward the pedal 22 side. In addition, 25 in the figure is a return spring.

On the other hand, a sleeve 11 is provided at the intermediate portion of the support shaft 10.
A bracket 12 and a damper arm 13 are fixed to the sleeve 11, the bracket 12 and a clutch release lever 27 are connected by a clutch rod 29, and a single-effect damper 31 which applies resistance to the damper arm 13 in the extending direction Concatenate. A stopper 28 is provided on the clutch case 26 to prevent the release lever 27 from turning at a constant level, and a long hole 32 into which a mounting pin 33 is inserted is provided at the mounting portion of the damper 31 on the vehicle body frame 30 side.
is formed.

A branch piece 14 that projects in the longitudinal direction is fixed to one end of the support shaft 10, and a branch piece 17 that projects in the radial direction is also provided at one end of the arm 15 on the side of this branch piece 14. In the embodiment, as shown in FIG.
This branch 1 is attached to one end of 5 through a short sleeve 16.
Equipped with 7.

A link 40 is constructed between these two branch pieces 14 and 17. In this embodiment, this link 40 is connected to the branch piece 14 on the support shaft 10 side by a pin 42, as shown in FIG.
Connect pin 43 at. Here, the positional relationship is that the support piece 17 on the arm 15 side is closer to the support shaft 10 than the support piece 17 on the arm 15 side.
is set so that it is closer to the gear shift lever 1 side.

Furthermore, tension springs 45 are tensioned on both pins 42 and 43, and the spring force urges both support pieces 14 and 17 in the direction toward each other. Here, the elongated hole 41 of the link 40
The pin 43 abuts against the inner ends of the support pieces 14 and 17, and the assembly angle of both the support pieces 14 and 17 is kept constant.

The operation of the interlocking operation device configured as above will be explained next.

First, move the gear shift lever 1 from the guide groove 81 to F2, for example.
When the arm 15 is tilted down into the engagement groove 82 of the clutch release lever 27, the arm 15 is tilted down so as to come into elastic contact with the roller 2 via the support shaft 10, the spring 45, etc. by a spring provided on the clutch release lever 27 side as is known, and the damper 31 is in an extended state, and a mounting pin 33 is located at the lower end of the elongated hole 32. This state is the ON state of the transmission and clutch, and the OFF state of the brake.

Then, when the gear shift lever 1 is tilted from the engagement groove 82 to the guide groove 81, the arm 15 that is engaged with the lever 1 via the roller 2 swings in conjunction with the arm 15.
Since the support piece 17 of No. 5 and the support piece 14 of the support shaft 10 are connected by a tension spring 45, the support shaft 10 also rotates integrally with the arm 15. Since the bracket 12 and damper arm 13 are integrally fixed to the support shaft 10 via the sleeve 11, the clutch lever 27 swings from ON to IN via the clutch rod 29 as shown in FIG. begins to separate. At this time, the damper 31 also moves downward by the length of the elongated hole 32 via the damper arm 13, and since there is no resistance in the direction of contraction, the damper 31 quickly contracts.

In this way, the release lever 27 goes beyond the IN state and the clutch is disengaged, and then the transmission is disengaged via the change rod 5 and the change arm 6. At this time,
The gear shift lever 1 is about to face the guide groove 81.

When the gear shift lever 1 further enters the guide groove 81, the release lever 27 abuts against the stopper 28.
It is in the OFF state, and from this point on, the branches 14 and 17
Since the tension spring 45 stretched therebetween starts to stretch, the operating load does not act on the release lever 27 and is absorbed by the stretch of the spring 45.

Therefore, from this point on, the support shaft 10 does not rotate, and the arm 15 swings on the support shaft 10 by the amount of the cutting allowance stroke of the mission. In this way, the shift lever 1 enters the guide groove 81, and the next shift operation can be performed without applying any load to the clutch release lever 27.

Since the support shaft 10 and the arm 15 are connected by the lost mechanism using the tension spring 45 in this way, the spring 4
The tension force of 5 causes the support shaft 10 and the arm 15 to move together until the clutch release lever 27 is regulated by the stopper 28, allowing the subsequent stroke of the speed change lever 1.

Next, when the gear shift lever 1 is tilted from the guide groove 81 to the first engagement groove 82 (excluding the neutral position N), the arm 15 swings in the opposite direction to the above due to the spring force of the tension spring 45 in the extended state. Then, the damper 31 quickly swings by the length of the long hole 32, and in the process, the pin 43 abuts the inner end of the long hole 41 of the link 40, and the inner end of the long hole 41 acts as a stopper to connect the arm 15 and the support. The shafts 10 begin to rotate together. When the release lever 27 is in the IN position, the clutch begins to connect.
Since the swinging speed of the arm 15 is regulated by the expansion resistance of the damper 31, the clutch is connected slowly, so that the drive torque can be smoothly transmitted to the drive wheels.

By the way, in the embodiment, since the clutch wire 21 is connected to the arm 15 and the wire 21 is connected to the brake pedal 22, the interlocking and lost motion of the arm 15 and subsequent parts are exactly the same as described above even when the pedal 22 is operated. .

Furthermore, when operating the gear shift lever 1, the arm 15
Since the clutch wire 21 connected to the clutch wire 21 has lost motion due to the swinging of the lever 19 at the connecting portion and the bending of the wire 21, the pedal 22 does not respond.

Also, the brake rod 23 and pedal 22 are connected to the elongated hole 2.
2a by a tension spring 24, when the pedal 22 is operated, the clutch is overlapped before the clutch is disengaged, and a weak braking force is obtained by the spring force, allowing smooth braking and starting. . Furthermore, after the clutch release lever 27 is regulated by the stopper 28, the brake rod 23 abuts against the rear end of the elongated hole 22a, so that a normal strong braking force can be obtained.

As is clear from the above explanation, according to the clutch connection/disconnection device according to the present invention, in particular, the arm side that interlocks with the gear shift lever and the support piece provided on the support shaft that supports this arm and is connected to the clutch side. Since the loss mechanism is provided by interposing a spring, it is possible to absorb the excess stroke of the shift lever during the shift operation, and thereby the stroke of the clutch release lever can be kept constant.

Further, even if the arm and the brake pedal, which also serves as the clutch pedal, are interlocked and connected as in the embodiment, the same effect can be obtained independently of each other.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the operation of the gear shift lever and brake pedal, including the clutch connection/disconnection device according to the present invention, Fig. 2 is a longitudinal cross-sectional view of the main parts thereof, and Fig. 3 is a cross-sectional view taken along the line shown in Fig. 2. FIG. 4 is an explanatory view of the operation of the clutch portion. In the drawing, 1 is a gear shift lever, 10 is a support shaft, 15
is an arm, 14 and 17 are branch pieces, 21 is a clutch wire, 22 is a pedal, 23 is a brake rod, 2
7 is a clutch release lever, 29 is a clutch rod, 31 is a damper, 40 is a link, 41 is a long hole, and 45 is a spring.

Claims (1)

[Scope of utility model registration request] In a device that connects and disconnects a clutch in conjunction with the operation of a gear shift lever, an arm that engages with the gear shift lever is swingably supported on a rotatable support shaft, and an intermediate portion of the support shaft and the clutch are connected to each other. The release lever is interlocked and connected by a clutch rod, and a stopper member is provided that engages with the clutch rod to restrict the amount of rotation of the support shaft to a certain amount, and a stopper member is provided at the end of the support shaft and the end on the arm side, respectively. A support piece is provided protrudingly, a link member and a tension spring are interposed between both support pieces, and this link member is provided with an elongated hole that allows the arm to further swing beyond the amount of rotation of the support shaft. A clutch connection/disconnection device characterized by: