JP3969088B2 - Constant velocity joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a constant velocity joint used in, for example, an agricultural machine.
[0002]
[Prior art]
Conventionally, there is a constant velocity joint shown in FIG. The constant velocity joint connects a first pin yoke 34 to one end of a coupling yoke 31 via a first cross pin 32, while a second pin yoke connects to the other end of the coupling yoke 31 via a second cross pin 33. 35 is connected. A substantially disc-shaped guide plate 36 having a cylindrical guide portion 36b at the center is fitted into the disc-shaped groove 31a at the center of the coupling yoke 31 so as to be rotatable and slidable. The spherical projections 34a and 35a of the first and second pin yokes 34 and 35 are fitted to the above.
[0003]
When the first pin yoke 34 rotates with the axial center line of the first pin yoke 34 inclined with respect to the axial center line of the second pin yoke 35, the guide plate 36 is decentered by the spherical protrusions 34a and 35a. Thus, the first pin yoke 34 and the second pin yoke 35 are inclined by the same angle with respect to the guide plate 36.
[0004]
[Problems to be solved by the invention]
[0005]
Grease in the grooves 31a disc-shaped upper Symbol coupling yoke 31, by centrifugal force due to the rotation of the coupling yoke 31, since it is pressed against the outer peripheral surface of the disc-shaped grooves 31a, the grease discoid collected in the outer peripheral portion of the groove 31a, a problem that sufficient grease is not supplied to the sliding surfaces of the inner surface and the guide plate 36 of the disc-shaped grooves 31a of the coupling yoke 31 there Ru.
[0006]
An object of the present invention is to easily occur insufficient grease is to provide a constant velocity joint filling interval of the grease can be prolonged.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the constant velocity joint of the invention of claim 1 is:
A coupling yoke in which a substantially disc-shaped guide plate having a guide portion at a substantially central portion is slidably fitted in a disc-shaped groove of the coupling yoke body;
A first pin yoke that is swingably connected to one end of the coupling yoke via a first cross pin, and a spherical protrusion is inserted into the guide portion of the guide plate;
In the constant velocity joint, which is connected to the other end of the coupling yoke through a second cross pin so as to be swingable, and the spherical protrusion includes a second pin yoke inserted into the guide portion of the guide plate.
A scraping member for scooping out grease filled in the disk-shaped groove from the radially outer portion to the radially inner portion is provided on the outer periphery of the guide plate.
[0008]
According to the present invention, the grease on SL guide plate the scraped member provided on the outer periphery of, accumulated in the radially outer portion of the disc-shaped groove of the coupling yoke, the disc Scrap out from the outer part of the groove to the inner part. Therefore, the grease does not remain in the radially outer portion of the disk-shaped groove and the grease is supplied to the sliding surface between the inner surface of the disk-shaped groove and the guide plate. . Therefore, smooth movement between the coupling yoke and the guide plate can be ensured over a long period of time, and the grease filling interval can be lengthened.
[0009]
A constant velocity joint according to a second aspect of the present invention is the constant velocity joint according to the first aspect, wherein the scraping member is made of an elastic material.
[0010]
According to the invention of claim 2, since the scraping member is made of an elastic material and can be elastically deformed, the outer end surface of the scraping member is on the outer peripheral surface of the disk-shaped groove of the coupling yoke. The area of the portion of the scraping member that scrapes out grease can be increased until it comes into contact with or is positioned in the vicinity of the outer peripheral surface of the disk-shaped groove. Therefore, the grease adhered to the outer peripheral surface of the disk-shaped groove or the grease in the vicinity of the outer peripheral surface can be scraped from the outer part to the inner part of the disk-shaped groove, and the grease filling interval is further increased. can do.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
[0012]
As shown in FIG. 1, the constant velocity joint is configured such that a first pin yoke 4 is connected to one end of a coupling yoke 1 via a first cross pin 2, while a second cross pin is connected to the other end of the coupling yoke 1. The second pin yoke 5 is connected via 3. A substantially disc-shaped guide plate 6 having a cylindrical guide portion 6b at the center is fitted into the disc-shaped groove 1a at the center of the coupling yoke 1 so as to be rotatable and slidable. The spherical protrusions 4a and 5a of the first and second pin yokes 4 and 5 are fitted to the above.
[0013]
As shown in FIGS. 1 and 2, eight arms 9 as an example of a scraping member are provided at equal intervals on the outer periphery 6 a of the guide plate 6. In FIG. 2, only one arm 9 is shown and the others are omitted. The arm 9 is made of rubber as an example of an elastic material, and is formed by bending a rubber plate having a thickness b into a bowl shape. The arm 9 has substantially the same width as the width g of the disk-shaped groove 1a and slides on the inner surface of the groove 1a on the disk of the coupling yoke 1.
[0014]
As shown in FIG. 2, the arm 9 includes a tip end portion 9a, an intermediate portion 9b, and a base portion 9c. The base portion 9c is fixed to the outer peripheral surface 6a of the guide plate 6 by vulcanization adhesion or the like. The intermediate portion 9b is inclined at an acute angle with respect to the rotation direction X of the guide plate 6 with respect to a tangent line h on the outer peripheral surface of the guide plate 6 at one end of the intermediate portion 9b in the sectional view of FIG. Further, the tip end portion 9a is slightly inclined in the rotation direction X of the guide plate 6 with respect to a straight line parallel to the tangent line h.
[0015]
In the above configuration, when the shaft centerline of the first pin yoke 4 rotates with respect to the shaft centerline of the second pin yoke 5, the rotational force of the first pin yoke 4 is the first cross pin 2, the coupling yoke 1. , And transmitted to the second pin yoke 5 via the second cross pin 3. At this time, the grease in the disk-shaped groove 1a accumulates in the radially outer portion C due to the centrifugal force generated by the rotation of the coupling yoke 1. However, the arm 9 provided on the outer peripheral surface 6a of the guide plate 6 rotates in the disc-shaped groove 1a of the coupling yoke 1 while the guide plate 6 is eccentric, and the direction of the arrow X in FIG. The grease accumulated in the radially outer portion C of the disc-shaped groove 1a of the coupling yoke 1 is scraped out from the outer portion C of the disc-shaped groove 1a to the inner portion. Therefore, the grease does not remain in the radially outer portion C of the disk-shaped groove 1a, and the grease slides between the inner surface of the disk-shaped groove 1a and the guide plate 6. To be supplied. Therefore, a smooth movement between the coupling yoke 1 and the guide plate 6 can be secured over a long period of time, and the grease filling interval can be lengthened.
[0016]
Further, since the arm 9 of this embodiment is made of rubber, even if the outer end surface of the arm 9 is in contact with the outer peripheral surface of the disk-shaped groove 1a, the arm 9 is elastically deformed without any trouble. . Further, since the arm 9 is elastically deformed in this way, the tip of the arm 9 can be brought into contact with or positioned in the vicinity of the outer peripheral surface of the disk-shaped groove 1a, and the grease of the arm 9 can be disposed. The area of the portion to be scraped can be increased. Accordingly, the grease adhering to the outer peripheral surface of the disk-shaped groove 1a or the grease in the vicinity of the outer peripheral surface can be scraped from the outer part to the inner part of the disk-shaped groove 1a, and the grease filling interval can be increased. It can be longer.
[0017]
In the above embodiment, the arm as an example of the scraping member is made of rubber, but the material of the scraping member may be a metal having a spring property such as spring steel or an elastic resin such as Teflon (registered trademark). Further, the shape of the scraping member is not limited to the above-mentioned bowl shape, but may be other shapes such as a spiral shape and a V-shape, and the number of the scraping members is not limited to eight but one or plural. It may be.
[0018]
【The invention's effect】
As is clear from the above, according to the constant velocity joint of the first aspect of the present invention, the scraping member provided on the outer periphery of the guide plate has a disk-like shape of the coupling yoke by the centrifugal force of the rotation of the coupling yoke. The grease accumulated in the outer portion in the radial direction of the groove is scraped from the outer portion in the radial direction of the disk-shaped groove to the inner portion, so that the disk-shaped groove can be effectively utilized by the grease accumulated in the outer portion. Can be supplied to the sliding surface between the inner surface of the guide plate and the guide plate. Therefore, according to the first aspect of the present invention, the smooth movement between the coupling yoke and the guide plate can be ensured over a long period of time, and the grease filling interval can be lengthened.
[0019]
According to the constant velocity joint of the invention of claim 2, since the scraping member is made of an elastic material, the outer end of the scraping member is brought into contact with the outer peripheral surface of the disk-shaped groove of the coupling yoke. Alternatively, it can be positioned in the vicinity of the outer peripheral surface of the disk-shaped groove, and the area of the portion of the scraping member that scrapes out the grease can be increased. Therefore, the interval between grease fillings can be further increased.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a constant velocity joint according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the constant velocity joint taken along the line AA in FIG.
FIG. 3 is a cross-sectional view of a conventional constant velocity joint.
[Explanation of symbols]
1 coupling yoke,
A few cross pins,
4,5 pin yoke,
6 Guide plate,
9 Arm.

Claims (2)

A coupling yoke in which a substantially disc-shaped guide plate having a guide portion at a substantially central portion is slidably fitted in a disc-shaped groove of the coupling yoke body;
A first pin yoke that is swingably connected to one end of the coupling yoke via a first cross pin, and a spherical protrusion is inserted into the guide portion of the guide plate;
In the constant velocity joint, which is connected to the other end of the coupling yoke through a second cross pin so as to be swingable, and the spherical protrusion includes a second pin yoke inserted into the guide portion of the guide plate.
A constant velocity joint, characterized in that a scraping member for scooping out grease filled in the disk-shaped groove from a radially outer portion to a radially inner portion is provided on the outer periphery of the guide plate.   The constant velocity joint according to claim 1, wherein the scraping member is made of an elastic material.

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