JP3976570B2 - Oscillator bearing cage position regulating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cage position regulating device for displacing a cage of a rocking bearing that supports a movable member such as a swash plate of a swash plate type hydraulic pump so as to freely swing.
[0002]
[Prior art]
Devices such as swash plate type hydraulic pumps and hydraulic motors can adjust the discharge rate of the pump and change the operating speed of the motor by adjusting the angle of the swash plate incorporated in the device. . There are a sliding method and a rolling method for adjusting the angle of the swash plate. In the rolling method, a swinging bearing for supporting a swinging swash plate having a convex arcuate surface is incorporated.
[0003]
As this oscillating bearing, a bearing ring fixed to a fixing member such as a housing having a concave arc-shaped surface, a roller arranged along a concave arc-shaped rolling surface of the race ring, and each roller can freely roll. In general, there is used a type in which a movable member such as a swash plate is brought into contact with and supported by each roller.
[0004]
In such a type of oscillating bearing, slipping occurs between each roller and the movable member while the movable member such as a swash plate repeatedly oscillates, and each roller is suitable for supporting the movable member. There is a risk of shifting from the correct position. For this reason, a device incorporating a rocking bearing is provided with a cage position regulating device that displaces the cage together with each roller to an appropriate position for supporting the movable member in accordance with the rocking of the movable member. There are many.
[0005]
An example of a cage position regulating device for this type of oscillating bearing is disclosed in Japanese Patent Application Laid-Open No. 7-167040. As shown in FIGS. 5 (a) and 5 (b), this restricting device is a roller bearing assembly (swinger) incorporated between the concave arcuate surface 51a of the housing 51 and the convex arcuate surface 52a of the swash plate 52. A follower link (control lever) 55 is rotatably attached to a frame body (cage) 54 of a dynamic bearing 53, and its one end 55a is slidable with the housing 51 and the other end 55b is slidable with the swash plate 52. The follower link 55 displaces the frame body 54 in accordance with the swinging of the swash plate 52.
[0006]
The follow-up link 55 is coupled to the frame body 54 through a pivot pin 55c formed in an intermediate portion so that a connection pin 56 protruding from the side surface of the frame body 54 is slidably passed through. Further, both end portions 55a and 55b of the follow link 55 are formed in a spherical shape, and one end portion 55a thereof penetrates the bore 51b formed in the housing 51, and the other end portion 55b penetrates the protruding portion on the side surface of the swash plate 52. Each of the bores 52b is slidably fitted.
[0007]
In the regulating device described above, the follow-up link 55 is rotatably attached to the frame body 54 by the connecting pin 56 provided on the narrow side surface of the frame body 54, but the swash plate 52 swings on the connecting pin 56. Since bending stress acts every time, it may be difficult to use depending on the size of the bearing due to design restrictions for ensuring strength, and troublesome processing is also necessary for forming the pin 56.
[0008]
The follower link 55 is preferably formed in a spherical shape so that both end portions 55a and 55b slide smoothly with the bores 51b and 52b formed on the housing 51 and the swash plate 52, and this processing requires considerable effort. Take it.
[0009]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a cage position regulating device for a rocking bearing that can be used regardless of the bearing size at a low manufacturing cost.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is incorporated between a fixed member having a concave arcuate surface, a movable member having a convex arcuate surface facing the concave arcuate surface, and both arcuate surfaces, A control lever that is pivotally attached to any one of the rolling element cages of a rocking bearing that has a raceway fixed to a fixed member and that supports the movable member in a freely swingable manner. In a cage position restricting device for a rocking bearing, which is slidably engaged with each member, and the cage is displaced by this control lever in accordance with the rocking of the movable member, By providing a lever support hole in which one end portion of the control lever is slidably engaged, and fitting the one end portion of the control lever into the support hole to prevent the control lever from coming off with the raceway ring or the cage, The control lever is fixed to the fixing member. Employing the configuration mounted rotatably.
[0011]
That is, a lever support hole in which one end portion of the control lever is slidably engaged is provided in the fixed member, and one end portion of the control lever is fitted into this support hole and is prevented from being removed by the race ring or the cage. As a result, the structure can be simplified and the design can sufficiently withstand the stress acting when the swash plate swings regardless of the bearing size.
[0012]
Even when the movable member is incorporated into the tubular member from the extending direction of the control lever by enabling the engaging portion between the control lever and the movable member to be visually observed from the extending direction toward the other end of the control lever. Can be incorporated while visually confirming the engagement state.
[0013]
The means for enabling the engagement portion between the control lever and the movable member to be viewed from the direction of extension to the other end of the control lever is such that a convex portion having a circular cross section protrudes from the side surface of the movable member, The other end portion may be formed in a U shape that slidably engages with the circular cross section of the convex portion. Alternatively, a pin that can be rotated from the side surface of the movable member is protruded, and a hole through which the other end of the control lever is slidably passed is provided, or the pin can be rotated from the side surface of the movable member. It is also possible to employ a structure in which an engaging lever protrudes and this engaging lever and the other end of the control lever are slidably engaged.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1A to 1C, this swing bearing retainer position regulating device has a concave arcuate surface 1a of a housing 1 as a fixed member and a convex arcuate shape of a swash plate 2 as a movable member. One end portion 5a of the control lever 5 slidably fitted in the lever support hole 1b provided in the housing 1 is prevented from coming off by the raceway ring 4 of the rocking bearing 3 incorporated between the control lever 2 and the surface 2a. 5 is rotatably attached to the housing 1, and the other end portion 5b of the control lever 5 is slidably engaged with the swash plate 2 and the intermediate portion 5c is slidably engaged with the cage 6 of the rocking bearing 3, respectively. It is.
[0015]
The rocking bearing 3 includes a bearing ring 4 fixed to the housing 1, rollers 7 arranged along a concave arcuate rolling surface of the bearing ring 4, and a cage that holds the rollers 7 in a freely rolling manner. 6, and the swash plate 2 is brought into contact with each roller 7 and supported so as to be swingable. The track ring 4 is fixed to a position where the opening of the lever support hole 1b is partially closed on one side by a positioning pin 4a on the lower surface side.
[0016]
One end portion 5a of the control lever 5 is formed thicker than the other end portion 5b and the intermediate portion 5c, and a convex arcuate surface that slides with the inner surface of the lever support hole 1b is formed on the distal end side of the one end portion 5a. A convex arcuate surface that slides on the lower surface of one side portion of the raceway ring 4 is formed at the step portion between the one end portion 5a and the intermediate portion 5c. The one end portion 5 a is secured to one side of the raceway ring 4 so as to be rotatably attached to the housing 1.
[0017]
On the other hand, the other end portion 5b of the control lever 5 is formed in a U shape and slidably engages with a circular cross section of the fixed pin 8 protruding from the side surface of the swash plate 2, and this engagement portion Is visible from the direction of extension of the control lever 5 to the other end side. Further, the intermediate portion 5c of the control lever 5 is passed through a notch 6b of the protruding portion 6a formed on one side surface of the retainer 6, and is slidably engaged with the narrowest portion of the notch 6b. Yes.
[0018]
That is, in this cage position regulating device, as shown in FIG. 2, when the swash plate 2 swings from the neutral position shown in FIG. 1 to the right in the drawing, the control lever 5 causes the other end 5b to swash plate. 2 and is rotated by one end portion 5a as a fulcrum, and the cage 6 is displaced together with the rollers 7 to a position corresponding to the swing amount of the swash plate 2 at the intermediate portion 5c. .
[0019]
Therefore, by appropriately designing the engagement position between the other end 5b of the control lever 5 and the fixing pin 8, each roller 7 supports the swash plate 2 even if the swash plate 2 repeats swinging. It can be prevented from moving out of an appropriate position. Further, since the control lever 5 and the fixing pin 8 are not limited in size, the control lever 5 and the fixing pin 8 can be designed to sufficiently withstand the stress acting when the swash plate 2 swings.
[0020]
When assembling the cage position regulating device, first, the one end portion 5 a of the control lever 5 is fitted into the lever support hole 1 b of the housing 1. Next, the bearing ring 4 of the rocking bearing 3 is fixed to the housing 1 to prevent the control lever 5 from coming off, and the retainer 6 holding the roller 7 is connected to the intermediate portion 5c of the control lever 5 by a notch 6b on one side thereof. It is assembled on the race ring 4 while being engaged. At this time, by incorporating the cage 6 into the neutral position, the control lever 5 is simultaneously set to the neutral position. Finally, the swash plate 2 set at the neutral position is moved closer to the other end side of the control lever 5 from the extending direction, and the fixing pin 8 on the side surface of the swash plate 2 is fitted into the U-shaped other end portion 5 b of the control lever 5. Just put it in.
[0021]
In the last step of the assembly procedure described above, the engagement portion between the other end 5b of the control lever 5 and the fixing pin 8 on the side surface of the swash plate 2 can be visually observed from the direction in which the swash plate 2 is assembled. Even when 2 is incorporated into the cylindrical member, it can be incorporated while visually confirming the engagement state with the control lever 5.
[0022]
3 and 4 show a modification of the method of engaging the control lever and the swash plate so that the engaging portion can be seen from the direction of extension to the other end side of the control lever.
[0023]
In the modification shown in FIGS. 3A and 3B, a rotatable pin 9 is projected from the side surface of the swash plate 2, and is formed on the other end side of the control lever 10 in a through hole 9 a provided in the pin 9. The arm portion 10a is slidably inserted.
[0024]
4 (a) and 4 (b), the engaging lever 11 that can be rotated from the side surface of the swash plate 2 is projected, and the arm portion 11a of the engaging lever 11 is It is slidably fitted into an engagement hole 12a formed on the other end side.
[0025]
In the embodiment described above, one end of the control ring fitted in the support hole is retained by the race ring by fixing the race ring so that one side portion thereof partially closes the opening of the lever support hole. Alternatively, one side portion of the cage may be formed to partially close the opening of the support hole, and the control lever may be prevented from coming off with the cage.
[0026]
【The invention's effect】
As described above, the cage position restriction device for a rocking bearing according to the present invention is configured such that one end portion of the control lever is slidably fitted into a lever support hole provided in a fixing member, and is prevented from being detached by a race or a cage. Since the control lever is pivotally attached to the fixed member, the structure is simpler than that of the conventional regulating device, and the manufacturing cost can be reduced. It can be designed to withstand the stresses it acts on.
[0027]
In addition, by making the engaging portion of the control lever and the movable member visible from the direction of extension to the other end of the control lever, control is possible even when the movable member is incorporated into the cylindrical member from the direction of extension of the control lever. It can be assembled while visually confirming the engagement state with the lever, and the assembling work can be performed easily and reliably.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a front view of a cage position regulating device according to a first embodiment, b is a longitudinal sectional view of a, and c is an enlarged plan view of a main part showing an engagement state between a cage of a and a control lever. 2 is a front view showing a state of the regulating device in FIG. 1 when the swash plate is swung. FIG. 3 is a front view showing a modified example of the regulating device in FIG. FIG. 4A is a front view showing another modified example of the regulating device in FIG. 1, and FIG. 4B is a front view showing a state of the regulating device in FIG. A is a front view of a conventional cage position regulating device, b is a longitudinal sectional view of a
DESCRIPTION OF SYMBOLS 1 Housing 1a Concave-arc-shaped surface 1b Support hole 2 Swash plate 2a Convex-arc-shaped surface 3 Swing bearing 4 Track ring 4a Positioning pin 5 Control lever 5a One end part 5b Other end part 5c Intermediate part 6 Cage 6a Protrusion part 6b Notch 7 Roller 8 Fixing pin 9 Rotating pin 9a Through hole 10 Control lever 10a Arm part 11 Engaging lever 11a Arm part 12 Control lever 12a Engaging hole

Claims (1)

  A fixed member having a concave arcuate surface, a movable member having a convex arcuate surface facing the concave arcuate surface, and a movable member mounted between the arcuate surfaces and having a race ring fixed to the fixed member. A control lever that is pivotably attached to any one of the rolling element cages of a rocking bearing that is pivotally supported is slidably engaged with each of the other two members. In a cage position restricting device for a rocking bearing in which the cage is displaced by a control lever in accordance with the rocking of the movable member, one end of the control lever is slidably engaged with the fixed member. A lever support hole is provided, and one end portion of the control lever is fitted into the support hole and is prevented from being removed by a raceway ring or a cage of the swing bearing, so that the control lever can be freely rotated on the fixing member. Attach as above An engaging lever that can be rotated is protruded from a side surface of the member, and the engaging lever and the other end of the control lever are slidably engaged with each other. A cage position regulating device for a rocking bearing characterized in that it can be seen from the direction of extension to the other end of the control lever.

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