JPH0314657B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved interlocking operation device in which the brake and clutch are operated by one pedal.

In riding working machines such as riding lawn mowers, in order to facilitate brake and clutch operations and reduce the number of operating parts, the brake operating system and clutch operating system are connected to one pedal. The brake and clutch are operated in conjunction.

Conventionally, the clutch is disengaged in advance when the pedal is depressed, and then the brakes are applied.In other words, the brake is applied after the clutch is disengaged, making it easy to brake suddenly. . This is because the braking force increases rapidly with a short stroke from near the final stroke of the pedal.

On the other hand, when the pedal force is released from a stopped state using the pedal brake, the clutch is connected without any braking force, which tends to cause a sudden start.

Therefore, attempts have been made to overlap the clutch disengagement operation and the brake operation, but with a simple overlap, the clutch disengagement operation must be set in the middle of the short brake stroke, which inevitably causes an increase in the pedal stroke. becomes short and difficult to operate.

The present invention has been made in view of the above circumstances.
The purpose of this is to generate a weak braking force by overlapping the clutch disengagement operation,
To provide an interlocking operation device for a brake and a clutch that prevents sudden braking and starting, performs smooth braking and starting, and is easy to operate because a long pedal stroke can be taken.

In order to achieve this object, the present invention forms a long hole in the pedal connected to the clutch operation system, and provides a lost mechanism that delays the brake operation from the clutch disengagement operation by loosely engaging the end of the brake rod in the long hole. The present invention is also characterized in that an overlap mechanism is provided in which a spring is stretched between the pedal and the brake rod to bias the brake rod toward the pedal, and the spring force generates a weak braking force even before the clutch is disengaged.

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

FIG. 1 is a side view of the interlocking operating device according to the present invention, showing a pedal in a non-operating state.

The footrest 3 of the pedal 2, which has a substantially bell crank shape and is pivoted 1 to the vehicle body at the corner, faces upward in front (to the left in the figure), and the connection part 4 with the operating system faces upward. A tension spring 11 is tensioned between the lower portion of the connecting portion 4 and a bracket 10 fixedly attached to the vehicle body behind the connecting portion 4, and the pedal 2 is biased to the return state shown in the figure by the force of the spring. A clutch wire 13 is connected to the intermediate portion of the connecting portion 4 via a lever 12.
The outer 14a through which the wire 13 is passed is fixed to the bracket 10.

The other end of the clutch wire 13 is connected to a clutch release lever 21.
A compression spring 23 is tensioned between the lever 21 and the bracket 22 fixedly fixed on the clutch case 20 in front of the lever 21, and the lever 21 is biased to the clutch connected state shown in the figure by the spring force. 24 protrudes from the top of the case 20.
Note that the outer 14b is fixed to the bracket 22.

A turnbuckle 15 is interposed in the middle of the clutch wire 13, that is, a rod 16 is connected to the front wire 13a, a cylindrical portion 17 is connected to the rear wire 13b, and a pin is inserted into the axial elongated hole 17a of the cylindrical portion 17. 1
A compression spring 19 is tensioned between the pin 18 and the end of the cylindrical portion 17 on the rod side.
It is urged to go inward. The spring force of compression spring 19 is now set high to maintain turnbuckle 15 in the relationship shown until the clutch is disengaged.

A long hole 5 extending in the front-rear direction is formed in the upper part of the connecting portion 4 of the pedal 2, and a bent portion 26 provided at the front end of the brake rod 25 faces into the long hole 5 and fits therein. The rear end of this brake rod 25 is connected to a brake operating lever 31 of the drive wheel, and a torsion spring 33 is tensioned on a support shaft 32 of this operating lever 31, and the spring force causes the lever 31 to be in the brake non-operating state as shown. energized.

Furthermore, a bracket 2 is attached to the front of the brake rod 25.
A tension spring 28 is tensioned between the bracket 27 and the upper part of the connecting portion 4, and the spring force urges the rod 25 toward the pedal 2, that is, toward the front, and the bent portion 26 is brought into pressure contact with the front end of the elongated hole 5. This tension spring 28 is connected to the torsion spring 3
Set the spring force to be stronger than 3.

The operation of the brake and clutch interlocking operation device using one pedal constructed as described above will now be described.

2 to 4 are action explanatory diagrams, and FIG. 5 is a stroke torque characteristic diagram.

First, when the pedal 2 is not operated, the brake is not operating and the clutch is in a connected state, as shown in FIG. The driving torque transmitted by the clutch at this time is a in FIG. The initial position of the pedal 2 is regulated by a stopper 8.

Then, when the pedal 2 is depressed, the second
As shown in the figure, the clutch wire 13 is pulled, the release lever 21 swings forward, and the clutch starts to be released. On the other hand, the brake rod 25 is also pulled by the tension spring 28, and the operating lever 33 also swings forward, but since the brake has some play, a weak braking force is generated from the state shown in FIG. The driving torque at this time is b in Figure 5.
And the brake braking torque is A.

As the lever is further depressed, the release lever 21 comes into contact with the stopper 24, as shown in FIG. 3, and the clutch opens. The driving torque at this time becomes zero at c in FIG. On the other hand, Figures 2 to 3
During the stroke process shown in Figure 5, the braking torque gradually increases and becomes balanced with the driving torque (Fig. 5B), and the load on the brake side overcomes the spring force of the tension spring 28, so the spring 28 begins to stretch and the brake rod 25
The front end bent portion 26 of the pedal 2 is relatively retracted within the elongated hole 5 of the pedal 2. The braking torque in the state shown in FIG. 3 is C in FIG.

In this way, a weak braking force can be generated by the tension spring 28 prior to the clutch disengagement operation, and the braking force gradually increases (as shown by straight lines A, B, and C in FIG. 5).

As the pedal is further depressed, the weak braking force is increased, and the front bent portion 26 of the brake rod 25 comes into contact with the rear end of the elongated hole 5, and from this point on, the pedal 2 and the rod 25 are integrally linked. Then, the operating lever 31 is strongly pulled to generate a normal strong braking force (d in FIG. 5), and the full stroke state shown in FIG. 4 is reached. The braking torque in this full stroke state is E in FIG.

By the way, in the stroke process from FIG. 3 to FIG. 4, the compression spring 19 of the turnbuckle 15 interposed in the middle part of the clutch wire 13 contracts against the operating load, and the pin 18 moves forward in the elongated hole 17a. Therefore, the release lever 21 after the clutch is disengaged
The tensile force on the is absorbed by such a lost mechanism.

The maximum stroke position of the pedal 2 is regulated by a stopper 9.

As mentioned above, the spring 28 overlaps with the clutch disengagement operation and generates a weak braking force.
As shown in Fig. 5, the driving torque is
While decreasing from to c, the braking force becomes i,
As the braking force increases as B, C, and D, braking occurs on the vehicle from the stroke B when the braking force and driving force are balanced (see (i) in the figure), and then increases as C and D.
Finally, a strong braking force is applied from N to E.

Therefore, compared to the conventional braking force in which the braking force increases rapidly from (ii) to Therefore, sudden braking can be avoided, and the pedal stroke can be longer, so smooth braking operation can be easily performed.

On the other hand, even if the pedal force is released from a stopped state using the pedal brake, the clutch can be engaged while the weak braking force remains in effect, which prevents sudden starts and allows for a smooth start.

As is clear from the above description, according to the brake and clutch interlocking operation device according to the present invention, the pedal and brake rod, which connect the clutch operation system, are connected by a lost mechanism using an elongated hole and a spring that biases the brake rod toward the pedal. Since it is connected via an overlap mechanism, it is possible to generate a weak braking force by overlapping with the clutch disengagement operation, making it possible to brake and start the vehicle smoothly, and also to have a long pedal stroke. It has many advantages such as ease of operation.

[Brief explanation of the drawing]

FIG. 1 is a side view of the interlocking operation device according to the present invention;
FIG. 2, FIG. 3, and FIG. 4 are similar action explanatory diagrams, and FIG. 5 is a pedal stroke drive and braking torque characteristic diagram. In the drawing, 2 is a pedal, 5 is a long hole, 13 is a clutch wire, 15 is a turnbuckle, 25 is a brake rod, and 28 is a spring.

Claims (1)

[Claims] 1. In a device in which a brake operating system and a clutch operating system are connected to one pedal so that the brake and clutch are operated in conjunction, an elongated hole is formed in the pedal to delay the brake operation from the clutch disengagement operation. A spring is provided between the brake rod and the pedal so that the end of the brake rod is loosely engaged with the hole, and the spring is biased toward the pedal so that it overlaps with the clutch disengagement operation to generate a weak braking force. A brake and clutch interlocking operation device featuring: