JPS6330578Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is designed to prevent inertial operation caused by stopping the operation of a drive working device such as a rotary tiller.
The clutch and brake, which are interposed in the power transmission shaft to the drive working device, are constructed so that they can be operated in conjunction with one operation lever. A clutch and a brake interposed in a common transmission mechanism are attached to the operating lever of the
When the lever is rocked to the clutch disengaged position, the brake is operated for braking, and when the lever is rocked to the clutch engaged position, the brake is operated to release the brake. At the same time, the lever is provided with a locking operation member that is movable only along its longitudinal direction.
an arcuate guide which is attached to and biased to move in a direction and guides a lock piece protruding from the operating member in a state where the operating lever moves in and out of the clutch in a swinging range in a state where it resists the movement biasing force; a groove, and a clutch which, when the operating lever is swung to the clutch disengaged position, is fitted and moved in the movement biasing direction by the movement biasing force to restrict the swinging of the lever in the clutch engagement direction. The present invention relates to a clutch/brake interlock operating device for a tractor, in which a cutting position holding groove is formed in communication with a lever swing guide bracket.

In the device configured as described above, when the operating lever is swung to the clutch disengaged position, the lock piece automatically moves into the retaining groove, so that the clutch is disengaged and the brake is not applied. Although the structure is designed to prevent the operation lever from being held in place and the operation lever being erroneously swung in the clutch engagement direction, if the operation lever is erroneously held in that state or the operation lever is When the member is pushed against the biasing force, the lock piece moves directly into the arc-shaped guide groove, and as a result, the operating lever is engaged by the biasing force of the clutch, which is normally biased into the clutch. The brake may unexpectedly swing in the direction causing the clutch to be engaged or the brake to be released, which could lead to various dangers. In other words, with the conventional brake system, the clutch disengagement and brake braking state were uncertain and unstable.

In view of the above-mentioned circumstances, the object of the present invention is to make the above-mentioned clutch disengagement and brake braking operating state reliably and stably maintained by making an extremely simple improvement to the groove formed in the bracket. has.

The clutch/brake interlock operation device for a tractor according to the present invention has the above structure, and the lever is pivoted within the clutch disengagement area of the operating lever in a state in which the bracket communicates with the clutch disengagement position holding groove. It is characterized by having grooves facing in the direction.

That is, when the operating lever is swung to the clutch disengaged position, the lock piece that automatically moves into the holding groove can be moved by slightly swinging the operating lever back in the clutch engagement direction. Since the clutch can be moved into the groove facing the lever swinging direction while the clutch is in the disengaged state, in this state, that is, in the clutch disengagement/brake braking operation state, there is no possibility that the operating member may be accidentally inserted or Even if a push operation is performed, the lock piece is only strongly pressed against the groove edge, and this can be prevented from moving into the arcuate guide groove. In other words, according to the device of the present invention,
In the clutch disengagement/brake braking operation state,
The clutch is configured such that the clutch cannot be disengaged unless two different operations are performed, such as a swinging operation of the operating lever and a pushing operation of the operating member. There is almost no possibility that this will happen unexpectedly, so the clutch disengagement and brake braking operation can be maintained reliably and stably, and dangerous situations caused by unconscious operation can be reliably prevented. It was possible to achieve the desired safety effect by making an extremely simple improvement to the groove formed in the groove.

Next, an embodiment of the present invention will be described in detail based on the drawings. As shown in FIG. 1, from the engine 10,
Over a transmission case 11 that houses a transmission mechanism to wheels 13 such as a transmission mechanism and a differential mechanism, a transmission shaft 5 and 12 with a double structure of inside and outside is installed in a cylindrical case 20 extending between both 10 and 11, Of these, the outer power transmission shaft 12 is interlocked and connected to the transmission mechanism for the wheels 13, and the inner power transmission shaft 5 is interlocked and connected to the power take-off shaft 14 that protrudes toward the rear of the aircraft body via the transmission mechanism 5A. In a tractor in which a clutch 3 and a brake 4 are interposed in a cylindrical case 20 near the front end of the inner transmission shaft 5 and in a transmission case 11, which are a common transmission mechanism for the The operating device for the brake 4 is configured as follows.

As shown in Figure 2, the transmission case 1
A box-cylindrical bracket 9 with a triangular side view is fixed to the front position of the driver's seat 15, which is installed at the upper rear position of the driver's seat 1. 1 with pivotable pivoting
The base end member 2A of the cylindrical operating lever 2 and the operating pieces 3A and 4 of the clutch 3 and brake 4.
A, when the lever 2 is in the clutch disengaged position, that is, when it is swung upwardly, the brake 4 is operated for braking, and when the lever 2 is in the clutched position, that is, swung downwardly, In order for the brake 4 to be in an interlocked state in which the brake is released, the levers are connected via the rod 16, the swing arm 17, and the rod 18. A shaft-like locking operation member 6 that is movable along the axis is inserted and held, and is held in one direction via a spring 19, that is, in the direction in which the finger operation part 6A (commonly known as a knob) at the tip thereof protrudes outward. The operating member 6 is urged to move, and a pin-shaped locking piece 7 is provided protruding from near the other end of the operating member 6 toward both sides. On the other hand, as clearly shown in FIG.
In the rocking range for engaging and closing the clutch 3, the lock piece 7 is locked and held in a state that resists the movement biasing force of the spring 19, and the movement of the lock piece 7 is guided. When the guide groove 8A and the lever 2 are swung to the clutch disengaged position, the lock piece 7 is automatically fitted and moved in the biasing direction by the biasing force of the spring 19, and the lever 2 is formed in communication with a clutch disengagement position holding groove 8B that restricts rocking in the clutch engagement direction.
Thus, another groove 8C is formed in the bracket 9 so as to communicate with the end of the clutch disengagement position holding groove 8B within the clutch disengagement area of the lever 2 in the direction in which the lever 2 swings.

Therefore, when the operating lever 2 is swung from the clutch engaged position shown by the solid line in FIG. 3 to the clutch disengaged position shown by the dashed line in FIG. move inwardly. From this state, when the lever 2 is swung around the horizontal axis 1 in the direction of engaging the clutch, as shown by the two-dot chain line in FIG. Cut/
The braking operation state is reliably maintained. When operating the clutch from the clutch disengagement holding state to the clutch engagement state, the lever 2 is first swung until the lock piece 7 moves into the holding groove 8B, and then the finger operation part 6A is pressed. The operating member 6 is moved against the spring 19 until the lock piece 7 is moved into the arcuate guide groove 8A (the state shown by the dashed line in FIG. 3), and then the horizontal axis 1 is turned downward. By performing the rocking operation, the clutch 3 can be engaged and the brake 4 can be released.

[Brief explanation of the drawing]

The drawings show an embodiment of the clutch/brake interlocking operation device for a tractor according to the present invention, in which Fig. 1 is an overall side view of the tractor, Fig. 2 is an enlarged schematic side view of the main parts, and Fig. 3 is an illustration of the operating lever section. FIG. 4 is a partially cutaway enlarged side view, and FIG. 4 is a vertical sectional view taken along the line of FIG. 3. DESCRIPTION OF SYMBOLS 1... Horizontal shaft, 2... Operation lever, 3... Clutch, 4... Brake, 5... Transmission mechanism, 6... Lock operation member, 7... Lock piece, 8A... Arc-shaped guide groove, 8B...Clutch disengagement position holding groove,
8C...Another groove, 9...Bracket.

Claims (1)

[Scope of claim for utility model registration] One operating lever 2 that can freely swing around the horizontal axis 1
, a clutch 3 interposed in a common transmission mechanism 5
and the brake 4, and the lever 2 engages the clutch 3.
When the brake 4 is swung to the cut position,
When the lever 2 is operated for braking and the lever 2 is swung to the engagement position of the clutch 3, the brake 4 is linked to the interlocked state in which the brake is released and the lever 2 is moved along its longitudinal direction. A locking operation member 6, which is movable in one direction and biased, is attached, and a locking piece 7 protruding from the operation member 6 is moved within the range of swinging of the operating lever 2 relative to the clutch 3. When the operating lever 2 is swung to the disengaged position of the clutch 3,
A clutch disengagement position holding groove 8B, which is inserted and moved in the movement urging direction by the movement urging force to restrict the swinging of the lever 2 in the clutch engagement direction, is communicated with the lever swing guide bracket 9. In the tractor clutch/brake interlock operation device, the bracket 9 includes:
Clutch-brake interlocking for a tractor, characterized in that a groove 8C is formed within the clutch disengagement area of the operating lever 2 in a state communicating with the clutch disengagement position holding groove 8B and directed in the swinging direction of the lever 2. Operating device. A clutch/brake interlock operating device for a tractor according to claim 1, wherein the common transmission mechanism 5 is a transmission mechanism for a power take-off shaft 14.