JPS631466B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for guiding a cage of a segment type rolling bearing for supporting a rocking body that holds a piston guide surface of a swash plate type axial piston machine. In the case of such rolling bearings, since the diameter of the swash plate rocking body corresponding to the inner segment is smaller than that of the stationary outer segment, the rocking body is attached to the rolling element relative to the side segment. In principle, when the cage is rotated between the cages and the rolling element, the cage cannot move together with the rolling element over a distance that is half the amount of rotational movement of the rocking element. However, the amount of cage movement must be limited. This is to ensure that the rolling elements do not run out of the range between the mutually supporting bearing parts from both sides. For example, the rolling elements do not always carry out a precise rolling motion and additionally slips occur. The degree of this slip added to the rolling motion is related to the force acting on the rolling elements. Therefore, if the pivoting movement of the rocking body is always carried out with a large force or quickly in one direction and with a very small force or very slowly in the other direction, the cage together with the rolling body moves in one direction. In this case, the bearing part, in other words, the bearing segment, is displaced relative to the bearing part, and thus a part of the rolling element is no longer retained. In such cases, the supporting force of the bearing is reduced. In order to avoid such displacements of the cage, it is known to have the cage rest against one stop. In this case, the center of the loaded part of the rolling bearing is no longer located in the line of force action, and in addition to this loading force, a force is exerted on the cage by the stop, which in the extreme case can be applied to the rolling elements. leading to slippage of the moving bearing segments,
On the one hand, it causes wear and on the other hand, it requires large adjustment forces. It may also result in damage to the cage and thus inability to use the bearing.

One gear is supported on one pin located in the cage, and this gear is mounted on each one of both bearing parts.
It is also known to interlock with two teeth. In this case, one of the two teeth can be mounted so as to be slidable in the longitudinal direction and be supported by a spring. This means that one spring member is utilized for the return of the cage. However, in the context of a single tooth, such teeth are extremely expensive, require a large amount of space, or are subject to wear (see US Pat. No. 3,396,670).

The present invention has the following objects. That is to say, by preventing slips or falling off of cages with rolling bearings without the risk of the above-mentioned failures and at a small cost, and guaranteeing permanently satisfactory functionality at a low cost and with little wear. be.

This object was achieved by the present invention as follows.
That is, a spring member having two legs is provided, each time when the cage is deflected from its reference position, one of the legs exerts a return force on the cage in the direction of the reference position, and Under the returning force, it is brought into frictional contact with a part of the cage or with a member fixed to the cage.

According to such a configuration, there is no need for structurally expensive treatment using tooth meshing as in the previously mentioned known example, and it is also possible to provide one hole each in the bearing casing, the swash plate rocking body, and the cage. It is also possible to avoid forming and guiding one pin into engagement with these three holes, and in short, the desired function is guaranteed easily and inexpensively.

In this case, it is preferable to arrange one pin-shaped projection on each of the casing, the cage, and the rocking body. In this case, the three projections are connected to each other by a spring element, and the two legs are connected to each other at least at one end by an arc. Both legs can be elastically deformable and/or connected to each other by an elastic arc. In this way, the leg portion forms an elastic member.

In an advantageous embodiment, one leg forms a free end and the other leg is connected to a projection fixed to the housing. The connection to the projection fixed to the housing can be achieved by a spring element having two legs surrounding the projection. both legs of the elastic spring member each have an arcuate section at each end;
In particular, they may be connected to each other by arcs, at least one of which is elastic, in which case the projections of the casing and of the rocker and of the cage are all connected to the legs and arcs of the elastic spring element. The elastic spring member therefore surrounds all three projections.

According to a further embodiment of the invention, one support pin is provided in each of the two bearing segments or the cage and the two parts that are connected to each of these two bearing segments and mutually support each other via a rolling bearing. are arranged, and a spring member having two legs is supported on these three support pins. Due to geometrical laws, the cage of a rolling bearing moves by approximately half the swivel angle of the inner segment, so that the support pin connected to the cage moves by the distance traveled by the moving bearing segment, the inner segment. Move about half way. In the case of swash plate axial piston machines, the outer segment is the stationary part and the inner segment is the movable part which is fixed to the rocker. The three support pins thus always move in substantially a straight line. It is effective if the three support pins are arranged as follows. That is, when the inner segment occupies a central position relative to the outer segment, i.e., when the swash plate is positioned at right angles to the axis of rotation, the three support pins are supported so that they are located exactly in a straight line. Place the pins.
The spring element is made, for example, in the form of a bow spring or a clip spring as a spring element with two legs, which spring element is relaxed when the three support pins are aligned. As the central support pin connected to the cage is deflected, it creates tension, thereby exerting a return force on this support pin and thus on the cage. Since this return force acts more strongly the more the cage deviates from its reference position, unacceptably large deviations of the cage are prevented.

The invention further provides that a leg spring is wound around two pins that are fastened parallel to the pivot axis on the structural part that is connected to the inner segment, ie the rocker. The two legs of this spring guide the cage according to the pivot angle of the rocker. The angular difference between the rocker and the cage is compensated by the elastic legs, with play being provided in the part of the cage that the legs engage. This spring member may be straight or bent. It is also possible to arrange this spring element on only one pin and provide a corresponding detent. Furthermore, the spring member may consist of two tension springs, each tension spring acting on one end of the cage. In this case, both tension springs have their ends apart from the one that acts on the cage fixed to the outer segment or the inner segment.

The invention will now be explained with reference to the exemplary embodiment shown in the drawings: A rocking body 2 is rotatably supported in a housing 1 of an axial piston machine via rolling bearings 3, 4. The cylindrical outer surface of the rocking body 2 is in direct contact with the rolling element 4, and the rolling element 4 itself rolls on an outer race 3 supported within the casing 1. The rolling elements 4 are guided by a cage 5. This cage 5 is connected to one support pin 6.

A support pin 7 is fixed to the rocking body 2, and a support pin 8 is fixed to the casing 1.

A spring member 9 is pivotably supported on the support pin 6.

As long as the three support pins 8, 6, and 7 are located in a straight line, the spring member 9 moves without being elastically deformed and does not exert any force on the support pins or the cage 5. When the cage 5 is displaced from its reference position, the support pin 6 is also displaced from the linear connection with the support pins 7 and 8, and only at this time is the spring member 9 elastically deformed to the support pin 6 and eventually to the cage 5. exerts a returning force.

According to another embodiment, a spring element similar to the spring element 9 can be supported not pivotably on the support pin 6, but slidably on this support pin 6, in which case the spring element are three support pins 8,
6, 7, in other words the spring element is mounted in a floating manner. This, however, comes with a drawback. That is, the spring member will move due to the action of vibration or inertia exerted on the entire axial piston machine, and both ends of the spring member will protrude to the same extent beyond the two support pins 7, 8. The return force of the spring member differs depending on whether the spring member is in use or not.

FIG. 3 shows the rocking body 2 rotated clockwise with respect to the intermediate position shown in FIG. 1, and FIG. 4 shows the rocking body 2 rotated in the opposite direction. In both the state of FIG. 3 and the state of FIG. There is. When the cage 5 deviates from the illustrated reference position and moves further clockwise in the case of FIG. 3 or counterclockwise in the case of FIG. 4, the spring member 9 is elastically deformed via the support pin 6. This exerts a pulling force on the cage 5.

The embodiment shown in FIG. 5 differs from the embodiments shown in FIGS. 1 to 4 in that the spring member 10 has a different shape from the spring member 9, and the spring member 10 has a shape different from that of the spring member 9. is pivotably supported. A support pin 16 connected to the cage 5 and a support pin 17 connected to the rocker 2 slide between the two legs of the spring member 10. The free leg of both legs is connected to the support pin 16.
When a force is applied to this leg in an upward direction as seen in the drawing, a resistance action is produced. The other leg can flex when the support pin 16 attempts to deflect downwardly in the drawing from the straight connection between the other support pins 17,18.

In the embodiment shown in FIGS. 6 and 7, the rocking body 2
Two support pins 12 and 13 are fixed to the
One wire spring 1 is attached to these support pins 12 and 13.
4 is fixed, one leg side is fixed to the hole ring 19 of the cage 15, and the other leg side is fixed to the same cage 1.
The hole rings 20 of No. 5 are engaged with each other. hole ring 1
9, 20 on both legs of the spring member 14, so that in the intermediate position the spring member 14 exerts no force on the cage 15 as long as the cage 15 occupies its reference position. do not have. Even if the cage 15 undergoes a minimal deviation from its reference position, at least one leg of the spring member 14 exerts a corresponding return force on the cage 15.

In the case of the embodiment shown in FIGS. 1 to 4, if the central support pin 6 is designed to be thick, both leg sides will be elastically deformed as the spring member 9 is assembled. In this way, a slight initial tension can be applied to the spring member 9. In the embodiment shown in FIG. 5, the initial tension can be applied to the spring member 10 by wrapping the leg portion supported by the support pin 18 around the support pin 18.

[Brief explanation of the drawing]

Fig. 1 is a front view of the supporting part of the rocking body of an axial piston machine as seen in the direction of the rotation axis, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, and Figs. 3 and 4 are Both are front views showing different positions of the rocking body, and FIG. 5 shows another example.
FIG. 6 is a front view of another embodiment similar to FIG. 1, and FIG. 7 is a side view of the example shown in FIG. 6. 1... Casing, 2... Rocking body, 3, 4...
Rolling bearing, 5... cage, 6, 7, 8... support pin, 9... spring member.

Claims (1)

[Claims] 1. In a device for guiding the cage of a segment type rolling bearing for supporting the rocking body of a swash plate type axial piston machine, the cage 5 is guided each time the cage 5 deviates from its reference position. A spring element 9, 10 with two legs is provided for exerting a return force in the direction of the reference position, which spring element 9, 10 can be pivoted onto the machine casing 1 or onto the outer ring of the rolling bearing. The spring members 9, 10 are supported by the spring members 9, 10, and the two pin-shaped projections are parallel to each other and parallel to the pivot axes of the spring members 9, 10.
10, one protrusion is connected to the rocking body 2, and the other protrusion is connected to the cage 5.
A device for guiding a cage, characterized in that each device is fixed to a cage. 2 Casing 1, cage 5, and rocking body 2
Claim 1, wherein one pin-shaped protrusion is disposed in each of the three protrusions, and these three protrusions are connected to each other via one spring member having two leg parts. A device that guides the cage of segment type rolling bearings. 3. The segment type rolling according to claim 2, wherein one leg side of the spring member 10 constitutes one free end, and the other leg side is connected to a protrusion fixed to the casing. A device that guides the bearing cage. 4. The device for guiding the cage of a segment type rolling bearing according to claim 3, wherein the leg portion connected to the projection fixed to the casing is wrapped around the projection. 5 The spring member 10 has one leg side forming a free end, and this leg side is supported by one arcuate part supported by one support pin 17 fixed to the rocking body 2. is connected to two second leg parts,
2. A device for guiding a cage of a segmented rolling bearing as claimed in claim 1, wherein the second leg itself has a support pin, which support pin is connected to the casing. 6. Both leg sides are connected to each other by a circular arc at both ends thereof, and three support pins 6, 7, 8 are installed between these leg sides and the circular arc.
A device for guiding a cage of a segmented rolling bearing according to claim 2, in which all of the cages are arranged. 7. In a device for guiding the cage of a segment type rolling bearing for supporting the rocking body of a swash plate type axial piston machine, each time the cage 15 deviates from its reference position, the cage 15 is guided in the direction toward the reference position. In order to exert a return force, a spring element 14 with two legs is provided, which spring element 14 is fixed to two mutually parallel support pins 12, 13 fixed to the rocking body 2. , a device for guiding a cage of a segmented rolling bearing, characterized in that both legs of the spring member 14 engage with hole rings 19, 20 of the cage 15, respectively, with play.