JPS6232101Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a running clutch device for a working vehicle.

Two sets of belt tension type transmission clutches with different transmission ratios are provided across the output shaft connected to the engine and the input shaft connected to the wheels, and the transmission clutches are selectively switched to a transmission state to change speed. The present invention relates to a running clutch device for a working vehicle.

In the above-mentioned traveling clutch device for a work vehicle, it is desirable to be able to perform switching and stopping operations quickly with a light operating force from the viewpoint of safety and work efficiency.

The present invention was developed in view of the above-mentioned circumstances, and by devising the operation structure of the tension pulley, it is possible to perform both switching and stopping operations quickly with light operating force. The purpose is to

The characteristic structure of the traveling clutch device for a work vehicle according to the present invention to achieve the above object is that two sets of belt tension transmission clutches having different transmission ratios each include a swingable tension pulley. A pair of link members that bias the tension pulley toward the clutch engagement side and link each of the tension pulleys and the operated member that is swung in conjunction with the swiveling operation of the operating lever are connected to the operated member. The transmission clutch is pivotally connected with different phases in the circumferential direction around the swing axis, and by swinging the operating lever, the tension pulleys swing oppositely to each other to select the transmission clutch. a flexible mechanism configured to be able to switch to a transmission state automatically, and at each linkage point between the tension pulley and the link member, to release the linkage between the tension pulley and the link member in the transmission state to allow relative movement; and locks the operating lever in a position in which a line connecting a pivot position with respect to the operated member and a linked position with respect to the tension pulley in each of the pair of link members mutually sandwich the swing axis of the operated member. Provide a mechanism to hold the
Both transmission clutches are configured to be held in a non-transmission state, and this configuration provides the following effects.

That is, in order to selectively switch the transmission clutch to the transmission state, both tension pulleys are biased toward the engaged side, so when the operating lever is operated, the tension of the one that is in the engaged state is biased. While the pulley is oscillated against the biasing force, the other tension pulley is operated toward the clutch engagement side by the biasing force, but in the transmission state, the connection between the tension pulley and the link member is Since the tension pulley is configured to be released and allow relative movement between the two, the tension pulley reliably presses the belt only by the biasing force without adding any additional artificial operating force.

In the process of switching the transmission state,
Since both tension pulleys are linked so that they swing in opposition to each other, the biasing force that tries to swing the tension pulley toward the clutch engagement side is
At the same time, it also acts to swing the tension pulley that is in the engaged state against the biasing force, and as a result, the operating lever can be operated with extremely light operating force to quickly change the gear shifting state. There are advantages that can be achieved.

Furthermore, during a stop operation in which both transmission clutches are switched to a non-transmission state, it is necessary to hold both tension pulleys against the urging force; in this case, the tension pulleys must be held against the urging force. The reaction force of the force acting on the operated member acts on the operated member through the link member, but the line segments connecting the pivot position of each link member with respect to the operated member and the linked position with respect to the tension pulley mutually prevent the swing of the operated member. A mechanism is provided to lock and hold the operating lever in a position sandwiching the drive shaft, and both transmission clutches are held in a non-transmission state, so the force that holds the tension pulley against the biasing force is reduced. It is possible to lock and hold the operated member in a posture in which it is difficult to swing due to the reaction force, that is, in a posture in which the operating lever is difficult to swing due to this reaction force. It also has the advantage of being constructed with a simple mechanism with few.

As a result, we have achieved a clutch device for running a working vehicle that has great practical advantages.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

As shown in FIG. 1, an engine 3 is mounted on the front part of a running vehicle body having front and rear wheels 1 and 2 mounted on axles, and a seedling planting device 4 is installed on the rear part via a hydraulic cylinder 5 so that it can be driven up and down. , and a driver's seat 6 is provided at an intermediate position in the longitudinal direction of the machine body, thereby configuring a riding-type rice transplanter.

As shown in FIGS. 2 to 6, in order to transmit power from the engine 3 to the wheels 1 and 2, the engine 3 is connected to the transmission 7 in the transmission case 22.
The transmission is transmitted through a transmission device equipped with two belt tension transmission clutches 8A and 8A with different transmission ratios, and is transmitted from the transmission 7 through an internal gear transmission mechanism (not shown). The structure is such that the signal is transmitted to the front and rear wheels 1 and 2.

To configure the transmission, a camshaft 10 interlocked with the crankshaft 9 of the engine 3 is protruded to one side of the aircraft body, the protruding portion is used as an engine-side output shaft 10, and an output pulley 11 is connected to the output shaft 10. On the other hand, input pulleys 13 and 14 of different sizes and diameters are attached to the input shaft 12 protruding from the transmission 7, and the first and second transmission belts 15 and 16 are connected between the output pulley 11 and the input pulleys 13 and 14. The first and second tension pulleys 1 are wound around the transmission belts 15 and 16, respectively, and are positioned above the transmission belts 15 and 16.
7, 18 are attached, and the first and second tension pulleys 17, 18 are configured to be selectively engaged and operated by a manual operation lever 19 that can be freely operated along a straight path R in the longitudinal direction of the aircraft. It has been done.

The first and second tension pulleys 17, 18
Each of the tension arms 20 and 21 is pivotally connected to a support shaft 23 protruding from the upper part of the transmission case 22 in the left-right direction of the machine body so as to be able to swing freely around the axis P pointing to the left and right direction of the machine body. Arm 20,2
Tension springs 25, 25 are stretched across the frame 1 and the gate-shaped frame 24 when viewed from the front to constantly bias the first and second tension pulleys 17, 18, respectively, toward the entry side.

A manual operation lever 19 is provided on the protruding end side of the support shaft 23.
The plate body 27, which is an example of an operated member, is pivotably connected to the support bracket ₂₆ so as to be swingably connected to the operating lever 1.
First and second links 29, 30 are connected to intermediate positions in the longitudinal direction of the plate body 27 via elongated holes 28, and have one end pivotally connected to a predetermined position of the plate body 27, and both tension arms 20, 21 are pivotally connected to each other through a long hole 31 as an example of a flexible mechanism, and a groove 32 having a predetermined width is provided in the plate body 27.
In addition, both side walls 32a of the groove 32,
A fixing pin 33 that abuts on the support bracket 26 is provided to protrude from the support bracket 26 so that the plate 27 can be swung within a predetermined range.

With the above configuration, as the lever 19 swings, the second tension pulley 18 is separated from the second transmission belt 16 via the second link 30 against the biasing force of the spring 25, while the first tension pulley 18 is separated from the second transmission belt 16. A high-speed state in which the pulley 17 enters and operates the first transmission belt 15 by the biasing force of the spring 25 without acting on the first link 29 through the elongated hole 31 (see A in FIG. 4), and a first tension state. A low-speed state in which the second tension pulley 18 is operated while the pulley 17 is separated from the first transmission belt 15 (see FIG. 4B), and the first and second links 2
Line segments 1 and 1 connecting the pivot positions relative to the plate 27 and the pivot connection positions relative to the first and second tension pulleys 17 and 18 in each of the tension pulleys 9 and 30 correspond to the pivot axis P ₁ of the plate 27. In the position where the first
A clutch disengaged state (see C in FIG. 4) is obtained in which both the second tension pulleys 17 and 18 are separated from the first and second transmission belts 15 and 16.

In each of the low speed state and high speed state, the first
Both of the second links 29 and 30 are configured to be displaced on the same side with respect to the imaginary straight line L connecting the swing axis P of the lever 19 and the swing axis _P1 of the plate body 27, The structure is such that both the low speed state and the high speed state are stably maintained by the biasing force of one of the springs 25, 25.

As shown in FIGS. 2, 3, and 7,
The lever 19 is formed to be bendable and swingable in a lateral direction perpendicular to the clutch operating direction, and the lever 19 is engaged in a disengageable manner by lateral movement when the operating lever 19 is in a clutch disengaged operating position corresponding to the disengaged state. A recess 41 for use is formed in the lever guide frame 42, and a helical spring 43 for biasing the operating lever 19 towards engagement is provided in the bent portion of the lever, so that the lever 19 maintains the clutch in the disengaged state. It is configured so that it can be done.

As shown in FIGS. 2 to 7, the elongated hole forming member 36 connected to the tip of the rod 35 is inserted between the first and second links 29 and 30, and the first and second links 29 , 30 to attach the springs 25, 25 to the springs 25, 25, respectively, are inserted into the circular elongated holes 38 of the elongated hole forming member 36, and both links 29, 30 are inserted into the rods. Position rod 3 in the state of positioning 35.
5 and tension pulleys 17 and 18, and the rod 35 and a foot pedal 40 biased via a spring 39.
Both tension pulleys 1 are connected by the elongated hole 38.
While allowing alternative entry operations of 7 and 18,
As the pedal 40 is depressed, the first and second
The elongated holes 31, 31 formed in the links 29, 30 forcefully cut the tension pulleys 17, 18 that are in the engaged state without displacing the operating lever 19, and move the tension pulleys 17, 18 to the mission 7. The structure is such that the transmission can be stopped.

To carry out the present invention, a plate spring 44 for elastically engaging and supporting the lever 19 may be provided in place of the lever engaging recess 41, as shown in FIG. collectively.

Further, the present invention can be applied to various work vehicles such as combines and transport vehicles.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

Fig. 1 is a side view of the riding rice transplanter, Fig. 2 is a schematic front view showing the attachment part of the transmission clutch, Fig. 3 is a side view of the same part, and Fig. 4 A, B, and C show the gear change state. A side view, FIG. 5 is a perspective view of the transmission clutch, FIG. 6 is a cutaway rear view showing the linkage structure between the pedal and the transmission clutch, FIG. 7 is a plan view of the guide frame, and FIG. 8 is another embodiment. FIG. 8A or 8B...Transmission clutch, 19...Operation lever, 17, 18...Tension pulley, 27
...Operated member, 29, 30...Link member, 3
1... Flexible mechanism, P ₁ ... Swing axis, l... Line segment,
41 or 44...locking holding mechanism, 42...lever guide frame.

Claims (1)

[Claims for Utility Model Registration] 1. Two pairs of belt tension transmission clutches 8A, 8B with different transmission ratios are provided with swingable tension pulleys 17, 18, respectively, on the clutch entry side. a pair of link members 29 and 30 that respectively link the tension pulleys 17 and 18 with the operated member 27 that is swung in conjunction with the swiveling operation of the operating lever 19;
are pivotally connected to the operated member 27 with different phases in the circumferential direction around the swing axis _P1 , and the tension pulleys 17 and 18 are moved by swinging the operating lever 19. The transmission clutches 8A, 8B are configured to be able to be selectively switched to the transmission state by swinging in opposite directions, and the tension pulleys 17, 18 and the link member 29,
Tension pulleys 17 and 18 and link member 2 are connected to each other in the transmission state at respective link points with link member 30.
A flexible mechanism 31, 31 is provided which releases the linkage with the link members 9, 30 to allow relative movement, and the operated member 2 in each of the pair of link members 29, 30 is provided.
Pivot position and tension pulley 17 for 7,
A mechanism (41 or 44) is provided for locking and holding the operating lever 19 in a posture in which the line segments 1 and ₁ connecting the linked position and the non-operating member 27 sandwich the pivot axis P1 of the non-operating member 27. clutch 8
A running clutch device for a work vehicle configured to hold A and 8B in a non-transmission state. 2. A lever-engaging recess into which the operating lever 19 is formed to be bendable and swingable in a direction perpendicular to the operating direction thereof, and into which the operating lever 19 is removably engaged by movement in the orthogonal direction. 41,
Utility model registration claim 1, which is formed on the lever guide frame 42 and constitutes the locking and holding mechanism.
A traveling clutch device for a work vehicle as described in 2.