JPH0539937Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a gear shift operating device for a hydraulic transmission that incorporates an HST hydraulic unit.

(b) Conventional technology The discharge amount of the hydraulic pump is controlled by rotating the trunnion shaft, and the rotational speed of the output shaft is reduced to zero.
Hydraulic transmissions incorporating HST hydraulic units capable of variable speed steplessly between
When assembling the HST hydraulic unit to the transmission body, the detent rotor to which the speed change operation tool is connected is fitted and fixed to the trunnion shaft, and the detent holder on the fixed frame side is inserted into the locking groove formed on the outer periphery of the detent rotor. When the trunnion shaft is in the neutral position, the ball is engaged with the locking groove to maintain the neutral state.

(c) Problems to be solved by the invention Therefore, in the hydraulic transmission with the above configuration, the ball on the detent holder side is inserted into the locking groove of the detent rotor which is fitted afterward to the trunnion shaft of the HST hydraulic unit. No output will occur unless the engagement position matches the neutral position set for the HST hydraulic unit alone, but in reality, variations in machining accuracy of the detent rotor and assembly errors can be avoided. As a result, a slight misalignment occurs between the above-mentioned two positions, and in such cases, conventionally, the locking groove formed in the detent rotor is cut down for each item to match the actual item. There was a problem in that it required a lot of effort and skill to assemble because the positioning was done by going to the factory, and there was also the problem that parts were not interchangeable and repair became difficult because each item had to be matched with the actual item. It was hot.

This invention was implemented with the aim of solving the above problems, and makes setting the neutral position of the trunnion shaft much easier than before when assembling the HST hydraulic unit, and also makes repair work easier. The present invention provides a speed change operation device for a hydraulic transmission based on the above considerations.

(d) Means for solving the problem That is, the present invention forms a locking groove 4 on the outer circumference of the detent rotor 3 that is fitted and fixed to the trunnion shaft 2 of the HST hydraulic unit 1, and the trunnion shaft 2 is held in the neutral position. In a hydraulic transmission transmission operating device configured by installing a detent holder 6 holding a ball 5 that engages with the locking groove 4 in opposition to a fixed frame 7, the locking groove 4 is located on the outer periphery of the detent rotor 3. The detent rotor 3 is formed in a spiral shape in the rotational direction, and the detent rotor 3 is movable and fixed in the axial direction of the trunnion shaft 2. When the detent rotor is in a movable state, the detent rotor 3
is characterized by being provided with an adjustment mechanism 8 that moves the detent rotor 3 in the trunnion axis direction, changes the engagement position between the ball 5 and the locking groove 4, and adjusts the position of the detent rotor 3 with respect to the neutral position of the trunnion axis. It is.

(E) Function In the hydraulic transmission speed change operation device according to the present invention, the detent rotor 3, which is fitted onto the trunnion shaft 2 by engaging the ball 5 on the detent holder 6 side with the locking groove 4, is connected to the trunnion shaft 2. By simply operating the adjustment mechanism 8 that can move the detent rotor 3 in the axial direction of the trunnion shaft 2, the locking groove 4 of the detent rotor 3 can be moved in the rotational direction spirally on the outer periphery of the detent rotor 3. Due to the shape, the engagement position of the locking groove 4 with the ball 5 is shifted in the rotational direction of the trunnion shaft 2, and the neutral position of the detent rotor 3 can be adjusted with respect to the neutral position of the trunnion shaft 2. - Settings can be made accurately and easily.

(F) Embodiments Below, embodiments of the present invention shown in the drawings will be described.

The HST hydraulic unit 1 is housed in a housing case (fixed frame 7).
By rotating the trunnion shaft 2 protruding outward from the housing, the output speed of the hydraulic continuously variable transmission inside the housing can be changed steplessly from a no-output state (neutral position) to a maximum speed. The input shaft 9 and output shaft 10 are connected to the transmission body 1.
The hydraulic transmissions are assembled into the transmission main body 11 while interlockingly connected to the respective predetermined shafts of the hydraulic transmission.

A gear shift operating tool for remote control is attached to the trunnion shaft 2, and the trunnion shaft 2
A detent mechanism for maintaining the position of the trunnion shaft 2 in a non-output state (neutral position) is provided between the housing casing (fixed frame 7) and the housing casing (fixed frame 7), and these are installed with the following structure.

A concave portion 12 that is long in the axial direction is formed at a predetermined portion of the outside projecting portion of the trunnion shaft 2, and the detent rotor 3 is fitted into the portion where the concave portion 12 is formed.

The detent rotor 3 is equipped with a speed change operating device connecting portion 13, which is attached and fixed to the trunnion shaft 2 in a split-tight structure, as shown in FIG. A part of the recessed part 1 is screwed onto the split part in the direction.
2, the detent rotor 3 is integrated with the trunnion shaft 2, and when the bolt 14 is loosened, the detent rotor 3 becomes movable along the trunnion shaft 2. There is.

The outer edge of the detent rotor on the side opposite to the split portion is formed into an arcuate surface 15, and a locking groove 4 is formed spirally in the rotational direction on the outer periphery.
(See Figures 4 and 5) On the other hand, a detent holder 6 is fixedly installed at a predetermined position of the housing case (fixed frame 7), and the detent holder 6 is pressed against the outer edge of the detent rotor 3. Support the ball 5 to be energized, and the ball 5
is configured to fit into and engage with the locking groove 4.

In addition, the trunnion shaft 2 is located at a location that is appropriately displaced in the axial direction from the portion where the detent rotor 3 is fitted.
A support 16 is detachably attached and fixed to the support 16, and an adjustment mechanism 8 for moving the detent rotor 3 along the trunnion shaft 2 is installed on the support 16. In the embodiment, an adjusting bolt supported on a support 16 in the same direction as the trunnion shaft 2 is screwed into a screw hole on the detent rotor 3 side, and the detent rotor is moved by the forward and backward movement of the adjusting bolt. However, the adjustment mechanism is not limited to the illustrated example, and may be replaced with other appropriate means as needed.

When assembling the hydraulic transmission having the above configuration, the detent rotor 3 with the bolts 14 loosened is inserted into the trunnion shaft 2, and the recessed part 1 is inserted into the trunnion shaft 2.
2, the arcuate surface 15 is made to correspond to the detent holder 6, and the ball 5 supported by the detent holder 6 is placed in the locking groove 4.
be inserted into. Thus, the support body 16 is attached and fixed to the trunnion shaft 2, and the adjustment mechanism 8 supported thereon.
If the adjusting mechanism 8 is operated after connecting the detent rotor 3 to the detent rotor 3 side, the detent rotor 3 can be adjusted to the trunnion shaft 2 within the range allowed by the recessed portion 12.
, and the position of the locking groove 4 relative to the ball 5 changes in the direction of rotation of the detent rotor 3. Therefore, during assembly work, by simply operating the adjustment mechanism 8, fine adjustments and position settings can be made extremely easily so that the ball 5 and the locking groove 4 exactly match at the neutral position of the trunnion shaft 2. After this operation, if the bolt 14 is tightened to fix the detent rotor 3 to the trunnion shaft 2, the neutral setting is completed.

(g) Effects of the invention The present invention forms a locking groove 4 on the outer periphery of the detent rotor 3 that is fitted and fixed to the trunnion shaft 2 of the HST hydraulic unit 1, and when the trunnion shaft 2 is in the neutral position, the locking groove 4 is inserted into the locking groove 4. In a hydraulic transmission gear shift operation device configured by disposing a detent holder 6 holding an engaging ball 5 opposite to a fixed frame 7, the locking groove 4 is formed in a spiral shape in the rotational direction on the outer periphery of the detent rotor 3. At the same time, the detent rotor 3 is provided so as to be movable and fixed in the axial direction of the trunnion shaft 2, and when the detent rotor 3 is in a movable state, the detent rotor 3 is moved in the trunnion axial direction, and the engagement position between the ball 5 and the locking groove 4 is set. Since the structure includes an adjustment mechanism 8 that changes the position of the detent rotor 3 with respect to the neutral position of the trunnion shaft, the ball 5 on the detent holder 6 side can accurately move the detent rotor 3 at the neutral position of the trunnion shaft 2. The detent rotor 3 can be quickly adjusted to engage with the locking groove 4 on the third side, and the troublesome and time-consuming work of shaving the locking groove of the detent rotor 3 to align it, which was necessary with conventional models, is eliminated. It has the advantage of being completely unnecessary.

[Brief description of the drawings]

Figure 1 shows the HST of the hydraulic transmission according to this invention.
A partially cutaway view of the hydraulic unit. Figure 2 is an enlarged partial view of the main parts. Figure 3 is a partially cutaway side view of Figure 2 seen from direction A. Figure 4 is a detent in Figure 3. FIG. 5 is an enlarged side view of a part of the rotor, FIG. 5 is a view taken in the direction of arrow B in FIG. 4, and FIG. 6 is a partial view of a hydraulic transmission constructed by assembling the HST hydraulic unit. 1... HST hydraulic unit, 2... Trunnion shaft, 3... Detent rotor, 4... Locking groove, 5...
... Ball, 6 ... Detent holder, 7 ... Fixed frame, 8 ... Adjustment mechanism.

Claims (1)

[Scope of utility model registration request] A detent holder having a locking groove 4 formed on the outer periphery of a detent rotor 3 that is fitted and fixed to the trunnion shaft 2 of the HST hydraulic unit 1, and holding a ball 5 that engages with the locking groove 4 when the trunnion shaft 2 is in the neutral position. 6
In this hydraulic transmission gear shift operation device, which is constructed by disposing the detent rotor 3 in opposition to the fixed frame 7, the locking groove 4 is formed spirally in the rotational direction on the outer circumference of the detent rotor 3, and the detent rotor 3 is connected to the trunnion shaft 2. The detent rotor 3 is provided so as to be movable and fixed in the axial direction, and when the detent rotor 3 is in a movable state, the detent rotor 3 is moved in the trunnion axial direction to change the engagement position between the ball 5 and the locking groove 4, and the detent is set to the neutral position of the trunnion shaft. A speed change operation device for a hydraulic transmission, characterized in that an adjustment mechanism 8 for adjusting the position of a rotor 3 is provided.