JP2001349427A - Hst trunnion shaft driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an HST(hydrostatic transmission) trunnion shaft driving device capable of rapidly driving a trunnion shaft without requiring a switch operation to a manual operation. SOLUTION: This HST trunnion shaft driving device 1 rotates the trunnion shaft 5 of an HST device 2 with a motor 3 and adjusts output of the HST device 2 based on the rotation direction and the rotation amount. The driving device 1 comprises a clutch 8 for interrupting between an output shaft 4a of the motor 3 and the trunnion shaft 5, a rotating part 13 rotating integrally with the trunnion shaft 5, and a manual operation means 9 for driving the clutch 8, uncoupling connection between the output shaft 4a of the motor 3 and the trunnion shaft 5, and then rotating the rotating part 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an HST trunnion shaft driving device. The HST device (hydrostatic transmission) means a hydraulic transmission, and generally includes a hydraulic variable pump, and is used as a drive device in industrial machines such as agricultural machines and construction machines.

[0002]

2. Description of the Related Art A conventional HST trunnion shaft driving device includes:
The drive control of the HST device is performed by rotating a trunnion shaft for automatically controlling the motor and the like to adjust the output of the HST device. In the case of a failure of a drive device such as a motor of this device or an emergency occurring during automatic control, the user directly rotates the trunnion shaft by manual operation and adjusts the output of the HST device to thereby solve the above-described situation. Is required to respond quickly.

[0003]

However, in order to rotate the trunnion shaft by manual operation, it is necessary to temporarily disconnect the connection between a drive device such as a motor and the trunnion shaft and perform a switching operation for switching to the manual operation. As a result, quick switching was not possible.

[0004] The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an HST trunnion shaft drive device capable of rapidly driving a trunnion shaft without switching to manual operation. And

[0005]

As a means for solving the above-mentioned problems, the present invention provides an HST in which a trunnion shaft of an HST device is rotated by a motor, and the output of the HST device is adjusted by the rotation direction and the amount of rotation. In the trunnion shaft driving device, a clutch for intermittently connecting the output shaft of the motor and the trunnion shaft, a rotating unit that rotates integrally with the trunnion shaft, and driving the clutch to drive the output shaft of the motor and the trunnion shaft And a manual operation means for rotating the rotating part after the connection with the rotating part is interrupted.

In the above invention, when the manual operation means is operated, the connection between the output shaft of the motor and the trunnion shaft is cut off, and the rotating part rotates to rotate the trunnion shaft integrally. Can be adjusted. Thereby, the switching operation can be omitted and the manual operation can be promptly switched.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an HST device 2 provided with an HST trunnion shaft driving device 1 according to the present invention. The H
The ST trunnion shaft driving device 1 includes a motor 3, a trunnion shaft 4, a clutch mechanism 5, and a controller 6.
The motor 3 rotates forward and reverse to rotate the output shaft 3b via a speed reducer 3a. The trunnion shaft 4
Depends on the direction and amount of rotation of the HST device 2.
, Stop and forward / reverse rotation. The trunnion shaft 4 has a potentiometer 6, which outputs a potentiometer voltage corresponding to the rotation amount of the trunnion shaft 4 to the controller 6. The controller 6 controls the motor 3 according to a control flow described below. The HST device 2 has an HST
The output shaft 2a is driven to rotate, and a driving device of an industrial machine (not shown) such as an agricultural machine or a construction machine is driven by the rotation force.

The clutch mechanism 5 comprises a clutch 8 and a manual lever 9. The clutch 8 includes a clutch rotor 10, a clutch body 11, a clutch pin 12, and a clutch frame 13.

As shown in FIG. 2, the clutch rotor 10 has a circular shape, and the output shaft 3 of the speed reducer 3a is centered at the center.
An attachment hole 10a in which the fitting hole b is fitted, a conical tapered hole 10b opened on the outer peripheral surface, and a pin hole 10c that is continuous with the tapered hole 10b and that is orthogonal to the attachment hole 10a are formed. The clutch rotor 10 is, as shown in FIG.
With the output shaft 3b of the speed reducer 3a fitted into the mounting hole 10a from the motor side, a spring pin 10d is inserted into the pin hole 10c and penetrated through the output shaft 3b, whereby the output shaft 3b It is attached so that it rotates together with it.

As shown in FIG. 2, the clutch body 11 has a circular shape, and has a mounting hole 11a on the trunnion shaft side into which the trunnion shaft 4 is fitted, and the clutch side concentric with the mounting hole 11a on the motor side. A housing portion 11b which is recessed in a circular shape and in which the rotor 10 is housed is formed.
On the inner surface of the mounting hole 11a, two key grooves 11c are formed in the axial direction. Further, the clutch body 11
A boss 11d protrudes from the outer peripheral surface of the boss 11d, and the mounting hole 1d extends from the distal end surface of the boss 11d to the inner peripheral surface of the housing portion 11b.
A clutch pin hole 11e into which a clutch pin 12 described later is inserted is formed in a direction orthogonal to the center line of 1a. Further, on the trunnion shaft side of the clutch body 11, a projection 11f is formed around the mounting hole 11a. As shown in FIG. 3, the clutch body 11 inserts the trunnion shaft 4 into the mounting hole 11a from the trunnion shaft side and inserts the pin 4a into the mounting hole 11a.
By being fitted into the key groove 11c of FIG.

The clutch pin 12 comprises a cylindrical pin body 12a, and a tip portion 12b is formed in a tapered shape. The pin body 12a is inserted from above into a clutch pin hole 11e of the clutch body 11.
As shown in FIG. 3, the clutch body 11 is movably supported in the up-down direction, and the distal end portion 12b is detachably engaged with the tapered hole 10b. Further, the clutch pin 12 is connected to the pin body 12.
A pin bracket 12c is integrally fixed to the upper end side of FIG. As shown in FIG. 3, a clutch spring 14 for urging the clutch pin 12 downward is attached between the pin bracket 12c and a clutch frame 13 described later. The pin bracket 12c has a stopper 12 protruding toward the trunnion shaft.
d and a protruding piece 12e extending downward from the tip of the stopper 12d. A limit switch 16 to be described later is provided on the motor side of the pin bracket 12c.
A switch pressing portion 12f for pressing is provided.

As shown in FIG. 2, the clutch frame 13 has a mounting hole 13a fitted into the protrusion 11f of the clutch body 11, and four fixing screws (not shown) inserted around the mounting hole 13a. A screw hole 13b, a guide groove 13c in which the protruding piece 12e of the clutch pin 12 is located inside and is slidable in the vertical direction, and a circle continuing to the upper end of the guide groove 13c and centering on the mounting hole 13a. An arc-shaped long hole 13d is formed. The clutch frame 1
3, a protrusion 11f of the clutch body 11 is fitted into the mounting hole 13a, and is fixed integrally with the clutch body 11 by a fixing screw (not shown), as shown in FIG. The clutch frame 13 includes a clutch spring mounting plate 15a extending from the upper end of the clutch frame 13 toward the motor, a switch mounting plate 15b extending upward from the tip of the clutch spring mounting plate 15a, A lever spring mounting plate 15c extending from the lower end to the trunnion shaft side is provided. The clutch spring mounting plate 15
In the figure, the upper end of the clutch spring 14 is attached to the lower surface. The switch mounting plate 15b
As shown in FIG. 1, a limit switch 16 is attached to the limit switch 16. The limit switch 16 has a pressing portion 16a pressed from below, and the limit switch 16 is pressed by pressing the pressing portion 16a. Is turned on,
It outputs an ON signal to the controller 6.
A substantially U-shaped lever spring 17 is fixed to the upper surface of the lever spring mounting plate 15c. The lever spring 17 biases a manual lever 9 described later to a neutral position with respect to the clutch frame 13.

The manual lever 9 comprises a lever body 9a and a support 9b. The lever body 9a is provided with a shaft 9c protruding toward the motor, and a rotatable roller 9d mounted on the shaft 9c. As shown in FIG. 2, the support portion 9b has a ring shape, and the manual lever 9 is rotatably supported about the trunnion shaft 4 by inserting the trunnion shaft 4 therethrough. The roller 9d is located inside the elongated hole 13d of the clutch frame 13, and the pin bracket 1
2c is located above the stopper 12d to prevent the clutch pin 12 from moving upward,
It moves along d.

Next, the normal operation of the controller 6 of the HST trunnion shaft driving device 1 according to the present invention will be described.

When power is supplied to the HST device 2 by the user, the controller 6 sets the limit switch 1 in step S1 as shown in the flowchart of FIG.
It is determined whether or not 6 is turned on. When the switch is turned on, the motor 3 is rotated in step S4, and the process returns to step S1. If it is not turned on, in step S2, the designated value is compared with the potentiometer voltage output by potentiometer 6 to determine whether they match. If it is determined that they match, in step S3, the motor 3 is stopped, and the process returns to step S2. If it is determined that they do not match, in step S5, it is determined whether or not the limit switch 16 is turned on. If it is not turned on, it is determined in step S6 whether the potentiometer voltage is smaller than the specified value. If smaller than the designated value, in step S7, the motor 3 is rotated forward and the process returns to step S2. If the value is larger than the set value, in step S8, the motor 3 is rotated in the reverse direction, and the process returns to step S2. In step S5,
When it is determined that the limit switch 16 has been turned on, in step S3, the motor 3 is stopped, and
Return to 2.

As described above, when the motor 3 is rotated forward and backward, the clutch rotor 10 fixed to the output shaft 3b of the speed reducer 3a by the spring pin 10d rotates, and the clutch body 11 is also integrated via the clutch pin 12. Rotate.
As a result, the trunnion shaft 4 attached to the clutch body 11 so as to be integrally rotatable rotates until the designated value matches the potentiometer voltage. The manual lever 9 is interlocked with the clutch frame 13 via a lever spring 17 of the clutch frame 13 that rotates integrally with the clutch body 11 so as to be positioned at a neutral position.

As shown in FIG. 5A, when the user rotates the manual lever 9 from the neutral position C to the position A or B by manual operation, the roller 9d moves along the elongated hole 13d of the clutch frame 13. And the roller 9d comes into contact with the edge at the position A or the position B.
Is retracted from above, so that the clutch pin 12 can move upward. Further, as shown in FIG. 5 (b), when the manual lever 9 is rotated from the position A to the position F and the clutch frame 13 is rotated, the trunnion shaft 4 is rotated via the clutch body 11 integrated therewith. Can be. On the other hand, when the manual lever 9 is rotated from the B position to the R position, the trunnion shaft 4 can be reversely rotated. At this time, the clutch pin 12 is
Since b moves away from the tapered hole 10b and slides on the outer peripheral surface of the clutch rotor 10, the connection between the clutch rotor 10 and the clutch body 11 is cut off. When the clutch pin 12 moves upward, the limit switch 16 is turned on and the motor 3 stops. In this way, the connection between the motor 3 and the trunnion shaft 4 is cut off, and the manual operation of the trunnion shaft 4 by the manual lever 9 can be performed.

When the user operates the manual lever 9 to turn off the power of the HST device 2 while the limit switch 16 is turned on and then supplies the power again, the motor 3 is rotated in step S4. To rotate the clutch rotor 10 forward. At this time, the clutch spring 14
The tip portion 12b of the clutch pin 12, which is urged downward, is fitted into the tapered hole 10b and moves downward, whereby the limit switch 16 is turned off. Thereafter, the HST device 2 operates in the same manner as in step S2 and thereafter.

[0020]

As is apparent from the above description, according to the present invention, an HST trunnion shaft driving device for rotating a trunnion shaft of an HST device by a motor and adjusting the output of the HST device according to the rotation direction and the amount of rotation. At
A clutch that intermittently connects the motor output shaft and the trunnion shaft, a rotating unit that rotates integrally with the trunnion shaft, and a clutch that is driven to cut off the connection between the motor output shaft and the trunnion shaft, and then rotate the rotating unit. Since the manual operation means is provided, the connection between the output shaft of the motor and the trunnion shaft is cut off and the output of the HST device can be adjusted by operating the manual operation means. Thereby, it is possible to quickly switch to the manual operation without the switching operation.

[Brief description of the drawings]

FIG. 1 is a side view showing an HST device having an HST trunnion shaft driving device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of members constituting a clutch mechanism of the HST trunnion shaft drive device of FIG.

FIG. 3 is a partially enlarged view of the HST trunnion shaft driving device of FIG. 1;

FIG. 4 is a flowchart showing an example of the operation of the HST device in FIG. 1;

5 (a) is a view showing the operation of the HST trunnion shaft driving device of FIG. 1; (B) The figure which showed operation | movement of the HST trunnion axis drive device of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 HST trunnion shaft drive device 2 HST device 3 Motor 4a Output shaft 5 Trunnion shaft 8 Clutch 9 Manual lever (manual operation means) 13 Clutch frame (Rotating part)

Continued on the front page F term (reference) 3D036 AA06 EA01 EB03 EB14 GA48 GH14 GJ08 GJ12 3D039 AA02 AB11 AB21 AC04 AC49 AD23 3J053 AA00 AB01 AB44 3J070 AA03 CC01 DA21 DA24 EA11

Claims (1)

[Claims] 1. A trunnion shaft of an HST device is rotated by a motor, and the HST is rotated by a rotation direction and a rotation amount.
An HST trunnion shaft drive device for adjusting the output of the T device, a clutch for intermittently connecting the output shaft of the motor and the trunnion shaft, a rotating unit that rotates integrally with the trunnion shaft, and driving the clutch to An HST provided with manual operation means for rotating the rotating part after disconnecting the connection between the output shaft of the motor and the trunnion shaft.
Trunnion shaft drive.