JPH0454315A - Power transmission device - Google Patents

Abstract

PURPOSE:To prevent axial deflection of a main shaft and a follower shaft and smooth clutch action by installing a fixed pawl body and a movable pawl body at axial ends of both shafts, and inserting a protrusion protruded at the center of the axial end of one shaft into the center hole at the axial end of the other shaft. CONSTITUTION:Both ends of a main shaft 1 is formed to have a square cross section, a fixed pawl body 8 is installed unrotatably by a stop ring 9, and a protrusion 13 is protruded out. In the meanwhile, the protrusion 13 is inserted into a hole 12a formed on the inner side of follower shaft 12 supported by a sleeve 10a, a movable pawl body 14 is spline connected at an inner end part of the follower shaft 12, and a pawl 14a is engaged with a pawl 8a of the fixed pawl body 8 by a spring 15. A pin 16a of a shifter 16 is engaged with an outer circumferential groove of the movable pawl body 14. The main and the follower shafts 1, 12 are thus assembled in a straight line without causing axial deflection, thereby the movable pawl body 14 can be moved smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is effective for use in a mesh-type power disconnection device such as a side clutch that serves as a steering device for small agricultural machinery.

(Prior art) Small walking agricultural machines use mesh-type side clutches in their running bodies for simplicity and straight-line travel, and arbitrarily intermittent engine power transmitted to the left and right wheels, thereby controlling the vehicle's progress. I'm trying to steer the direction.

(Problems to be Solved by the Invention) Here, if a pair of driven wheels are extended from both ends of the main driving shaft, and a mesh type clutch is provided at the joint of the driven wheels, the wheels are driven by the driven shaft. The structure is simple, lightweight, and inexpensive, but especially in transplanters that require a reduction in weight, misalignment may occur between the main drive shaft and the driven shaft, resulting in a lack of smooth clutch operation. there were.

This invention eliminates the above deficiencies.

(Means for Solving the Problems) In order to solve the above problems, the present invention has a main drive shaft 1 which is rotatably supported by a gear box 2, and a sleeve 10a attached to the gear box 2. A driven shaft 12 is provided on an extension of the main driving shaft 1 and is supported by a driven shaft 12, and a fixed claw body 8 and a movable claw body 14 are attached to each shaft end.
The power transmission device is characterized in that a protrusion 13 protruding from the center of one end of one shaft is inserted into a hole 12a provided at the center of the other end.

(Function) Since the present invention is configured as described above, the movable claw body 1
4 toward the fixed claw body 8 side, the movable claw 14a and the fixed claw 8a mesh with each other, and the power of the main drive wheel 1 is transmitted to the driven shaft 12. Furthermore, when the movable claw body 14 is separated from the fixed claw body 8 from this state, the movable claw 14a separates from the fixed claw 8a, and the power of the main drive shaft 1 is no longer transmitted to the driven shaft 12.

(Effect) According to the present invention, the main drive shaft 1 and the driven shaft 12 are connected by inserting the protrusion 13 from one shaft into the hole 12a of the other shaft and assembling the sleeve 10a to the gear box 2. 1 and the driven shaft 12 are assembled in a straight line so that no misalignment occurs.

Also, during work, the load on the power transmission and the weight of the machine may cause the main drive shaft to
Even if the driven shaft 12 and the driven shaft 12 are bent, these shafts
Since the protrusion 13 on one side is inserted into the hole 12a on the other side at the joint, and the axis does not shift, the movement of the movable body is always smooth.

(Example) Next, an example of the present invention will be described with respect to a seedling transplanter shown in the drawings.

As shown in FIG. 2, a main drive shaft 1 is installed horizontally in a gear box 2, and the rotation of an engine 3 fixed in front of the gear box 2 is
The signal is transmitted through a worm (not shown) to a worm wheel 4 rotatably provided on the main drive shaft 1. The clutch body 5 is attached to the drive shaft 1 so as not to turn with a key 6,
The claw 5a is pushed to the left by the spring 7 and engages with the claw 4a of the worm wheel 4.

The gear box 2 has small chambers 2a on the left and right sides, into which both ends of the main drive shaft 1 protrude. Both ends of the main drive shaft 1 are made to have a square cross section, are attached to prevent the fixed claw body 8 from rotating, and are then prevented from coming off with a stop shaft 9.

A lid 10 integrated with a sleeve 10a is fixed to the gear box 2 with bolts 11 so as to chain the small chamber 2a, and a driven shaft 12 is supported by the sleeve 10a. Projections 13 protrude outward from both ends of the driving shaft 1 and are inserted into the hole 12 inside the driven shaft 12.
It is inserted into a.

In addition, holes are provided in the facing surfaces of the main drive shaft 1 and the driven wheel 12, and both ends of the independently provided protrusions 13 are provided in these holes so as to be rotatable, or one side is provided with a friend or the like so that it cannot rotate. Also good.

A movable pawl body 14 is attached to the inner end of the driven shaft 12 by a spline so as not to rotate, and is pushed inward by a spring 15 so that its pawl 14a engages with a pawl 8a of a fixed pawl body 8. The pin 16a of the shifter 16 engages with the groove on the outer periphery of the movable claw body 14, and due to its operation, the movable claw body 14 compresses the spring 15 and moves to the left (or right), so that the claw 14a separates from the claw 8a. It has become.

As shown in FIG. 1, the axle transmission case 17 is provided diagonally downward from the rear, and as shown in FIG. The wheel 18 at the rear end moves up and down as it is pushed and pulled.

The sprocket 19 is connected to the driven shaft 12 within the wheel transmission case 17.
A chino 22 is wound around this and a sprocket 21 of an axle 20 at the lower end.

A gear 23 is fixed to the worm wheel 4 and meshes with the gear 24. A gear 26 is provided at the outer end of a shaft 25 to which the gear 24 is fixed, and is configured to rotate the implantable rod 27 shown in FIG. 1 along an elliptical locus. Note that the seedling platform 28 moves left and right as the gear 26 rotates. The sensor 29 on the lower abdomen slides on the ridge and moves up and down with respect to the aircraft depending on the shallowness and depth of the valley, and upon receiving the signal, the wheel 18 and the rear floating shaft 30 move up and down. ing.

When assembling the seedling transplanter thus constructed, the sleeve 10a and the driven shaft 12 are assembled, and then the lid 10 is attached to the gear box 2 with bolts 11.

At this time, since the small hole provided in the lid 10 for the insertion of the bolt 11 is made larger than the outer diameter of the bolt 11, the driven shaft 12
However, according to the configuration shown in the figure, the protrusion 13 is pushed into the hole 12a before the lid 10 is tightened to the gear box 2 with the bolt 11, so the driven shaft The axial center of 12 automatically overlaps with the axial center of drive shaft 1. Further, even if the space between the drive shaft 1 and the driven shaft 12 is bent due to the load during power transmission or the weight of the machine body, the movable claw body 14 moves smoothly because the axis misalignment is small.

[Brief explanation of drawings]

FIG. 1 is a side view of a seedling transplanter according to the present invention, and FIG. 2 is an enlarged cutaway plan view of a portion thereof. The symbols in the figure are as follows.

Claims (1)

[Claims] A driving shaft 1 is rotatably supported by a gear box 2, and a driven shaft 12 is rotatably supported by a sleeve 10a attached to the gear box 2 and provided on an extension of the driving shaft 1. A fixed claw body 8 and a movable claw body 14 are attached to the shaft end, and a protrusion 13 protruding from the center of one shaft end is inserted into a hole 12a provided at the center of the other shaft end. Power transmission device.