JPH0324896Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a coupling used when connecting two rotating shafts coaxially, such as when connecting the drive shafts of each swash plate pump of a tandem type swash plate pump. It is related to the device.

BACKGROUND ART FIG. 5 shows a tandem type swash plate pump in which two swash plate pumps a and b are connected, and both swash plate pumps a and b of this pump have respective drive shafts as shown in FIG. c and d are connected by a coupling e.

The coupling e is spline-fitted to both the drive shafts c and d, and its axial movement is controlled by the drive shafts c and d.
It is regulated by snap springs f, f fitted on d. And this coupling e
The axial positioning of is carried out by a spacer g interposed between the snap springs f, f. Further, an impeller h is often attached to the coupling e to improve the self-priming performance of the pump.

Problems to be Solved by the Invention In the above conventional configuration, (1) the snap springs f, f need to be strong in order to maintain the thrust force applied to the coupling e from the invera h, etc., and (2) In addition, it is often unstable in terms of quality for the snap springs f, f to maintain thrust force while rotating themselves. There were problems such as the selection process requiring a lot of man-hours.

Means and Effects for Solving the Problems The present invention was developed in view of the above, and includes two drive shafts 1 and 2 having splines 1a and 2a at their tips and spaced apart from each other coaxially. To,
In a coupling device that connects both drive shafts 1 and 2 in the rotational direction by spline-fitting a coupling ring 3, a relief part 5 without spline teeth is provided in the middle part of the coupling ring 3, and a retainer is installed in this relief part 5. The retainer is inserted into the device in a state of interference in the axial direction, and the retainer is fixed to one of the drive shafts, so that movement of the coupling in the axial direction is restricted via the retainer.

Embodiment An embodiment of the present invention will be described based on FIGS. 1 and 2.

In the figure, reference numerals 1 and 2 are the respective drive shafts of both swash plate pumps constituting the tandem swash plate pump.
are placed apart from each other. Splines 1a and 2a are provided at the tips of these drive shafts 1 and 2. 3 is a coupling that connects both drive shafts 1 and 2, and an impeller 4 is fitted into this coupling 3. Splines that fit into the splines 1a and 2a of the drive shafts 1 and 2 are provided on the inner surface of both ends of the coupling ring 3, and a relief portion 5 having a diameter larger than the spline root diameter is provided between the two splines. The length of the relief portion 5 is the same as the distance L between the two drive shafts 1 and 2 facing each other. 6
is a retainer, and this retainer 6 is provided with splines on its outer periphery that are the same as the splines 1a and 2a of the drive shafts 1 and 2, and the length in the axial direction is the same as the length of the relief portion 5. There is. The retainer 6 is fixed to one drive shaft 1 with bolts 7. Further, this retainer 6 is engaged with one of the drive shafts 1 in the rotation direction by a knock pin 8, but the drive shaft 1 and the retainer 6 are in a positional relationship in which the spline teeth are shifted by 0.5 teeth in the rotation direction. It is becoming fixed. That is, as shown in A and B of FIG. 2, the pin hole 10 on the retainer 6 side is offset by 0.5 spline teeth with respect to the pin hole 9 on the drive shaft 1 side. Due to the misalignment of the spline teeth, both end surfaces of the splines of the retainer 6 partially contact the end surfaces of the splines inside the relief section 5 of the coupling ring 3 and are interfered in the axial direction, and the retainer 6 is forced into the relief section of the coupling ring 3. Located within 5.

The assembly order in the above configuration will be explained below.
A retainer 6 is inserted into the middle relief part 5 of the coupling ring 3. At this time, the retainer 6 engages with the splines of the coupling ring 3 and is moved in the axial direction, and is separated from the splines at the intermediate relief portion 5 and can freely rotate. Further, a dowel pin 8 is driven into the pin hole 9 of one of the drive shafts 1.

Next, the coupling 3 is inserted into the spline 1a of one of the drive shafts 1, and the knock pin 8 is fitted into the pin hole 10 of the retainer 6, and then the retainer 6 is fixed to the drive shaft 1 with the bolt 7.

In this state, the retainer 6 interferes with both splines of the coupling 3 in the axial direction, and the coupling 3 interferes with the splines 1a of the one drive shaft 1 while its axial movement with respect to the drive shaft 1 is restricted by the retainer 6. Spline fitted.

Thereafter, the distal end of the other drive shaft 2 is spline-fitted to the other end of the coupling ring 3, and the pumps are fixed, thereby connecting the drive shafts 1 and 2.

Although the above embodiment describes a coupling for connecting both drive shafts 1 and 2 of a tandem type swash plate pump, the coupling is not limited to this embodiment. It can also be applied to other things.

FIGS. 3 and 4 show another embodiment of the present invention, in which the outer periphery of the retainer 6' that engages with the relief part 5' of the coupling ring 3' fits into the inner diameter of the relief part 5'. In addition to being circular, this retainer 6' is divided into two parts. As shown in FIG. 4, each retainer piece 6a', 6b' is engaged with a relief part 5' with a gap δ in the diametrical direction, and a bolt 7' is inserted into this gap δ. Thus, both retainer pieces 6a' and 6b' are fixed to one of the drive shafts 1. Note that the dimension of the gap δ between the retainer pieces is the minimum dimension that allows one retainer piece 6a', 6b' to be assembled after the other retainer piece is assembled, and also that both retainer pieces 6a', 6b' can be assembled together.
The dimensions are such that bolt 7' cannot be tightened unless b' is securely assembled. A shim 11 is interposed between the retainer 6' and the drive shaft 1, and the position of the coupling 3' with respect to the drive shaft 1 is adjusted by changing the thickness of the shim 11.

Effects of the Invention According to the present invention, even if a large thrust force is applied to the coupling ring 3, it can be held sufficiently, and it can be constructed with a small number of parts. Further, adjustment work in the axial direction during assembly is no longer necessary, and the number of assembly steps can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the main part of the present invention;
Figure 2 A is a cross section along the - line in Figure 1, and A
FIG. 2B is a view taken from arrow B, FIG. 3 is a sectional view showing another embodiment of the present invention, FIG. 4 is a front view of a retainer, and FIG. 5 is a tandem swash plate pump. FIG. 6 is a sectional view showing the main parts of the conventional example. 1 and 2 are drive shafts, 1a and 2a are splines,
3, 3' are coupling rings, 5, 5' are relief parts, 6,
6' is the retainer.

Claims (1)

[Scope of utility model registration request] A coupler ring 3 is spline-fitted to two drive shafts 1 and 2 which have splines 1a and 2a at their tips and which are coaxially spaced apart, thereby connecting both drive shafts 1 and 2 in the rotational direction. In the coupling device, a relief part 5 without spline teeth is provided in the middle part of the coupling ring 3, and this relief part 5
A coupling device characterized in that a retainer is inserted into the drive shaft so as to interfere with each other in the axial direction, and the retainer is fixed to one drive shaft.