Tripod type constant velocity joint

Abstract

To sufficiently and surely lubricate an internal peripheral side of an outer roller.SOLUTION: In a tripod-type constant velocity joint, a groove is formed at an internal peripheral face of an outer race, a tripod 4 is arranged therein, and an outer roller 6 inserted into the groove, and rotating with an axial line along a radial direction of the outer race as a center is rotatably held to a trunnion 7 of the tripod 4. The outer roller 6 is formed into a ring shape, and a passage 15 penetrating into the internal peripheral face from an external peripheral face of the outer roller 6, and allowing a lubricant to circulate therein is formed at a point which does not contact an inner face of the groove at a portion on an internal peripheral side edge part 11 side.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a tripod-type constant velocity joint, and more particularly to a structure for supplying a lubricant to the inner peripheral side of an outer roller. [Background technology]

[0002] As described in Patent Documents 1 and 2, a tripod-type constant velocity joint is a shaft coupling in which outer rollers held by three trunnions in a tripod are engaged with grooves provided along the axial direction on the inner periphery of a cylindrical outer race (outer member), a first rotating shaft is connected to the tripod, and a second rotating shaft is connected to the outer race, and torque is transmitted between these rotating shafts. The outer rollers are rotatably held relative to the trunnions by needle rollers arranged on their inner peripheries, or an inner roller is arranged on the inner periphery of the needle rollers and a trunnion is fitted to the inner roller. Relative rotation and sliding occur between the outer rollers and needle rollers, between the needle rollers and the trunnions or inner rollers, between these rollers and snap rings, and between the outer rollers and the grooves in the outer race, so a lubricant such as grease is supplied. In the tripod constant velocity joint described in Patent Document 1, for example, a recess for holding grease is formed on either the outer periphery of the trunnion or the inner periphery of the inner roller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-336783 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-177958 Summary of the Invention [Problem to be solved by the invention]

[0004] Lubricants such as grease decrease in viscosity and increase in fluidity as the temperature increases. In tripod-type constant velocity joints, grease is placed inside the outer race. When the temperature increases due to frictional heat or other factors, the fluidity increases, and the centrifugal force generated by the rotation of the outer race causes the grease to flow and adhere to the inner circumferential surface of the outer race. Therefore, a sufficient amount of grease is supplied between the outer roller and the groove in the outer race. However, because the width of the outer roller (the length measured in the direction of the rotation axis) is greater than the depth of the groove, the outer roller is not entirely immersed in grease. As a result, the inside of the outer roller is shielded from the grease adhering to the inner circumferential surface of the outer race. In other words, when the outer race is rotating and transmitting torque, it is difficult to supply a sufficient amount of lubricant such as grease to the inside of the outer roller, i.e., between the outer roller and needle rollers, or between the trunnion and needle rollers or inner roller. In particular, given the recent trend to reduce the amount of lubricant such as grease in order to reduce overall weight and costs, there is a possibility that the sliding portion on the inner periphery of the outer roller will not receive enough lubrication, which may lead to wear and the resulting heat generation, as well as flaking.

[0005] The present invention has been made in light of the above technical problems, and has an object to provide a tripod-type constant velocity joint that can sufficiently lubricate the inner peripheral side of the outer roller. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides a tripod-type constant velocity joint in which a groove is formed in the inner peripheral surface of a cylindrical outer race that is attached to and rotates on a first rotating shaft, the groove extending in the direction of a first central axis of rotation; a tripod is disposed inside the outer race and is connected to a second rotating shaft that rotates about a second central axis of rotation that intersects with the first central axis of rotation at a predetermined angle; the tripod has a trunnion that protrudes in a radial direction relative to the second central axis of rotation; and an outer roller that is inserted into the groove and rotates about an axis along the radial direction of the outer race is rotatably held by the trunnion; the outer roller is ring-shaped and has an outer peripheral edge that opens toward the bottom of the groove and an inner peripheral edge that opens toward the opposite side from the bottom of the groove; and a passage through which a lubricant can flow is formed in a portion of the inner peripheral edge that does not contact the inner surface of the groove, the passage penetrating from the outer peripheral surface to the inner peripheral surface of the outer roller. a needle roller is disposed on the inner peripheral side of the outer roller, and a retaining ring is attached to the inner peripheral surface of the inner peripheral edge portion to restrict movement of the needle roller in the axial direction, and the retaining ring is provided with a guide surface that communicates with the passage and extends from the outer peripheral surface of the retaining ring to the inner peripheral surface of the retaining ring. It is characterized by the following.

[0007] In the present invention, the passage may be a notched groove formed by cutting the inner peripheral edge portion in the axial direction of the outer roller.

[0009] In the present invention, the depth of the notched groove on the inner circumferential side of the outer roller may be greater than the depth of the notched groove on the outer circumferential side of the outer roller.

[0010] Also, The release of Akira is , a tripod-type constant velocity joint including an outer roller inserted into the groove and rotating about an axis along the radial direction of the outer race, the outer roller having a ring-shaped outer edge portion that opens toward the bottom of the groove and an inner edge portion that opens toward the opposite side from the bottom of the groove; a passage through which a lubricant can flow, penetrating from the outer peripheral surface of the outer roller to the inner peripheral surface, at a portion of the inner peripheral edge portion that does not contact the inner surface of the groove; the passage being a notched groove formed by cutting the inner peripheral edge portion in the axial direction of the outer roller;A needle roller is disposed on the inner peripheral side of the outer roller, and a retaining ring is attached to the inner peripheral surface of the inner peripheral edge portion to restrict movement of the needle roller in the axial direction. The notched groove has a depth on the inner peripheral side of the outer roller that is deeper than a depth on the outer peripheral side of the outer roller, and thus has a groove bottom surface that guides the lubricant that flows due to centrifugal force to the inner peripheral side of the outer roller. The retaining ring has a lower surface on the opposite side to an upper surface that contacts the needle roller, and because the thickness of the retaining ring is thinner on the inner peripheral side than on the outer peripheral side, the lower surface is continuous with the groove bottom surface and forms an inclined guide surface that guides the lubricant that flows due to centrifugal force from the outer peripheral part of the retaining ring toward the inner peripheral part. It is characterized by the fact that

[0011] In this invention, the lubricant is placed inside the outer race so that when the outer race rotates, it adheres to the inner side of the outer race by centrifugal force to form a lubricant layer of a predetermined thickness, and the opening position of the passage on the outer peripheral surface of the outer roller may be set outer than the radial position of the lubricant layer from the first central axis of rotation of the outer race. [Effects of the Invention]

[0012] According to this invention, the lubricant can flow into the inner peripheral side of the outer roller from the passage provided in the outer roller, so even if the lubricant sticks to the inner peripheral part of the outer race due to centrifugal force, it can sufficiently lubricate the sliding part on the inner peripheral side of the outer roller. In particular, since the part where the passage opens on the outer peripheral surface of the outer roller does not come into contact with the inner surface of the groove in which the outer roller engages, even if the outer roller rolls inside the groove, flaking or the like can be prevented on the inner surface of the groove or on the outer peripheral surface of the outer roller, which also improves durability in this respect.

[0013] Furthermore, if a retaining ring is provided to hold the needle roller arranged on the inner periphery of the outer roller, the retaining ring is provided with a guide surface that communicates with the above-mentioned passage, so that the lubricant flows over the retaining ring to the inner periphery, thereby enabling sufficient lubrication of the sliding parts on the inner periphery of the outer roller.

[0014] Furthermore, by forming the passage using a notched groove and making the depth of the notched groove deeper on the inner periphery side of the outer roller than on the outer periphery side, the lubricant caused by centrifugal force flows inside the notched groove from the outer periphery side of the outer roller to the inner periphery side, making it possible to more reliably or sufficiently supply the lubricant to the inner periphery side of the outer roller.

[0015] Similarly, if a guide surface is formed on the retaining ring, the guide surface also promotes the flow of lubricant from the outer periphery of the retaining ring toward the inner periphery due to centrifugal force, thereby enabling the supply of lubricant to the inner periphery of the outer roller to be more reliably or sufficiently performed.

[0016] Furthermore, by positioning the opening of the passage or notch groove on the outer peripheral surface of the outer roller at a position where it is immersed in the lubricant layer formed inside the outer race by centrifugal force, the flow of lubricant to the inner peripheral side of the outer roller via the passage or notch groove and the resulting lubrication of the sliding parts on the inner peripheral side of the outer roller can be more reliably or sufficiently achieved. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view showing the overall configuration of an embodiment of the present invention. [Figure 2] 1 is a cross-sectional view of the outer race cut along a plane perpendicular to the rotational axis and viewed from the direction along the rotational axis. [Figure 3] FIG. 4 is a cross-sectional view showing one of the outer rollers. [Figure 4] FIG. 4 is a front view showing one of the outer rollers. [Figure 5]FIG. 4 is a partial cross-sectional view showing an enlarged view of a notched groove serving as a passage. [Figure 6] 1 is a cross-sectional view showing the overall configuration of an example of a single-roller type tripod constant velocity joint. [Figure 7] 7 is a partial cross-sectional view showing an enlarged view of a notched groove serving as a passage in the outer roller shown in FIG. 6. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is merely an example of how the present invention can be implemented, and is not intended to limit the present invention.

[0019] 1 is a cross-sectional view showing the overall configuration of one embodiment of the present invention, which is configured to connect a first rotating shaft 1 and a second rotating shaft 2, whose respective central rotation axes can intersect at a predetermined angle, so as to be able to transmit torque. It has an outer race 3 connected to the first rotating shaft 1 and rotating integrally therewith, and tripods 4 connected to the second rotating shaft 2 and rotating integrally therewith. The outer race 3 is a cylindrical member, and the tripods 4 are disposed inside it. The tripods 4 are integrated with the outer race 3 in the rotational direction and engage with each other so as to be able to move relatively in a direction along the central rotation axis O3 (first central rotation axis) of the outer race 3, thereby transmitting torque between them.

[0020] 2 and 3, three grooves 5 parallel to the rotation center axis O3 are formed on the inner peripheral surface of the outer race 3. The opposing side wall surfaces of the grooves 5 are substantially spherical, or in other words, the cross section of the grooves 5 taken along a plane perpendicular to the grooves 5 is an arc. An outer roller 6 held by tripods 4 is disposed inside each groove 5 so as to come into contact with the side wall surface having an arcuate cross section.

[0021] The tripod 4 has three trunnions 7 that protrude radially (radially from the rotational axis O2 of the second rotating shaft 2) outward from a boss portion into which the second rotating shaft 2 is fitted. These trunnions 7 are arranged at equal intervals in the circumferential direction, and the outer circumferential surface of each tip is spherical. The example shown in Figures 1 and 2 is a double-roller tripod constant velocity joint, in which an inner roller 8 is arranged on the inner circumferential side of the outer roller 6. This inner roller 8 is a roller with a rectangular cross section and an overall ring shape, and its inner diameter is approximately equal to the outer diameter of the trunnion 7. Therefore, the inner roller 8 is fitted and held on the outer circumferential side of the trunnion 7. A needle roller 9, in which many needles are arranged along the outer circumferential surface of the inner roller 8, is arranged, and the outer roller 6 is fitted on the outer circumferential side of the needle roller 9. In other words, the outer roller 6 is rotatably held by the trunnion 7 via the needle roller 9 and the inner roller 8.

[0022] As shown in Figures 3 and 4, the outer roller 6 is a ring-shaped roller with a spherical outer peripheral surface, and one open end in the central axis direction (the end that faces the bottom of the groove 5 when placed inside the groove 5) is an outer peripheral edge portion 10, and the opposite open end is an inner peripheral edge portion 11. Snap rings (retaining rings) 12 and 13 are fitted into the inner peripheral sides near the edges 10 and 11, respectively. The inner diameters of these snap rings 12 and 13 are smaller than the outer diameter of the inner roller 8 described above, and therefore the needle roller 9 and inner roller 8 are held or restrained in the axial direction (the vertical direction in Figure 3) by the snap rings 12 and 13 to prevent them from slipping out from inside the outer roller 6.

[0023] Grease is placed inside the outer race 3 as a lubricant. When the outer race 3 and other components rotate to transmit torque between the first rotating shaft 1 and the second rotating shaft 2, the temperature of the grease rises due to heat generated by friction at the sliding parts, increasing its fluidity. Furthermore, centrifugal force acts on the grease as the outer race 3 rotates, resulting in the formation of a lubricant layer 14 along the inner circumferential surface of the outer race 3, as shown by the shaded area in FIG. 2 . The thickness (or depth) of the lubricant layer 14 is adjusted by the amount of grease placed inside the outer race 3. In the embodiment described here, the surface (oil level) of the lubricant layer 14 is positioned radially from the central axis of rotation of the outer race 3 near the inner circumferential edge 11 of the outer roller 6, or at a thickness (or depth) that is closer to the inner circumferential edge 11 in the radial direction of the outer race 3.

[0024] A passage is provided to guide the grease serving as the lubricant to the inner periphery of the outer race 3. This passage may be any passage through which the grease, whose viscosity has decreased and fluidity has increased, can pass. In the embodiment described herein, notch grooves 15 shown in FIGS. 4 and 5 are formed as the passage. Specifically, as shown in FIG. 4, the inner edge portion 11 of the outer roller 6 is notched with a rectangular cross section, forming the notch groove 15. This notch groove 15 extends from the outer periphery to the inner periphery of the outer roller 6. A plurality of notch grooves 15 are provided in the inner edge portion 11 at intervals in the circumferential direction. The opening positions of the notch grooves 15 (opening positions on the outer periphery of the outer roller 6) are positioned so that they are immersed in the lubricant layer 14. In other words, the distance from the first rotational center axis O3 of the outer race 3 to the surface (oil level) of the lubricant layer 14 is greater than the distance from the first rotational center axis O3 of the outer race 3 to the surface (oil level) of the lubricant layer 14. The opening position of the notched groove 15 (the opening position on the outer peripheral surface of the outer roller 6) is a position where the outer roller 6 and the groove 5 formed in the outer race 3 do not come into contact with each other.

[0025] The notched grooves 15 are intended to guide the grease that flows due to centrifugal force to the inner circumferential side of the outer roller 6, so in order to more actively generate the flow due to centrifugal force, it is preferable that the so-called groove bottom surface of the notched grooves 15 be an inclined surface. Figure 5 shows an example of this, where the groove bottom surface 16 of the notched groove 15 is inclined so that the depth of the notched groove 15 is shallow on the outer circumferential side of the outer roller 6 and deep on the inner circumferential side.

[0026] A snap ring 13 is provided on the inside of the inner peripheral edge portion 11 of the outer roller 6, and it is preferable to configure the outer roller 6 so that the flow of grease is also promoted by this snap ring 13. For example, as shown in Figure 5, by making the thickness of the snap ring 13 thicker on the outer peripheral side and thinner on the inner peripheral side, a lower surface 18 opposite to an upper surface 17 that contacts the needle roller 9 serves as a guide surface that is inclined continuously to the groove bottom surface 16.

[0027] One end of a bellows-shaped boot 19 is fixed to the outer periphery of the open end of the outer race 3, and the other end of the boot 19 is fixed to the second rotating shaft 2. In this way, the inside of the outer race 3 is liquid-tightly sealed by the boot 19, and a predetermined amount of grease is enclosed inside.

[0028] Torque transmission by the tripod-type constant velocity joint described above is performed in the same manner as in conventional joints. That is, when torque is transmitted from the first rotating shaft 1 to the outer race 3 while there is a predetermined operating angle between the first rotating shaft 1 and the second rotating shaft 2, the outer roller 6 is fitted in the groove 5 on the inner periphery thereof. Moreover, the outer roller 6 can move in the longitudinal direction of the groove 5 but cannot move in a direction perpendicular to the groove 5 (the direction of rotation). Therefore, the torque is transmitted to the second rotating shaft 2 via the outer roller 6 and the tripod 4 that holds it. In this case, because the operating angle is set, the outer roller 6 reciprocates longitudinally within the groove 5, and the trunnion 7 oscillates relative to the inner roller 8, causing the intersection angle between them to change continuously. Torque is transmitted from the outer race 3 to the tripod 4 with this relative movement, maintaining constant velocity.

[0029] When torque is transmitted from the first rotating shaft 1 to the second rotating shaft 2, the outer race 3 rotates together with the first rotating shaft 1, causing centrifugal force to cause the grease inside it to flow toward the inner circumferential surface of the outer race 3. The grease also adheres to the inner circumferential surface of the outer race 3, forming a lubricant layer 14. The grease that flows and is held in this manner adheres to or comes into contact with the outer circumferential surface of the outer race 3, and when it reaches the open end of the notched groove 15, it is permeated into the notched groove 15 by flow pressure caused by centrifugal force. The groove bottom 16 of the notched groove 15 is inclined so that the radius from the rotation center axis O3 of the outer race 3 is larger on the inner circumferential side than on the outer circumferential side of the outer roller 6. Therefore, the grease that has permeated into the notched groove 15 flows further toward the inner circumferential side of the outer roller 6 due to centrifugal force, as shown by the arrow in FIG. 5.

[0030] In this embodiment of the present invention, grease as a lubricant can be actively introduced to the inner circumferential side of the outer roller 6. As a result, grease can be reliably or sufficiently supplied to sliding parts such as between the outer roller 6 and the needle rollers 9, between the needle rollers 9 and the inner roller 8, and between the inner roller 8 and the trunnion 7, thereby preventing or suppressing friction, wear, and flaking in these parts and improving durability. In particular, with the above configuration, some of the grease that adheres to the inner circumferential surface of the outer race 3 and forms the lubricant layer 14 can be introduced to the inner circumferential side of the outer roller 6, thereby reducing the amount of grease required and enabling cost and weight reductions.

[0031] Furthermore, as mentioned above, if the underside 18 of the snap ring 13 fitted on the inner periphery of the outer roller 6 is configured as a guide surface that is inclined continuously to the groove bottom surface 16, the flow of grease toward the inner periphery of the outer roller 6 can also be promoted by the snap ring 13, making it possible to lubricate the inner periphery of the outer roller 6 even more reliably or sufficiently.

[0032] Although the above-described embodiment is an example in which the present invention is applied to a double-roller tripod constant velocity joint, the tripod constant velocity joint of the present invention can also be configured as a single-roller tripod constant velocity joint. Figures 6 and 7 show such an example, in which the trunnion 71 of the tripod 4 shown here is cylindrical, with needle rollers 9 arranged on its outer periphery, and the outer roller 6 attached with the needle rollers 9 sandwiched between them. Therefore, when a predetermined operating angle is set between the first rotating shaft 1 and the second rotating shaft 2, the outer roller 6, together with the trunnion 71, tilts with respect to the groove 51, and the outer roller 6 reciprocates within the groove 51 while continuously changing its tilt angle.

[0033] A notched groove 15 serving as a passage is formed in the inner peripheral edge portion 11 of the outer roller 6. The notched groove 15 opens at a location on the outer peripheral surface of the outer roller 6 that does not come into contact with the inner surface of the groove 51 in the outer race 3 and that is immersed in the lubricant layer 14. The groove bottom surface 16 of the notched groove 15 is inclined toward the inner peripheral side of the outer roller 6, similar to the example shown in FIG. 5 described above. In other words, the grease that flows into the notched groove 15 is configured to flow toward the inner peripheral side of the outer roller 6 by centrifugal force. In FIG. 7, the reference numeral "112" denotes a snap ring.

[0034] Therefore, even in a single-roller tripod constant velocity joint, the inner and outer peripheral surfaces of the outer roller 6 communicate with each other through a passage (for example, the notched groove 15) located radially outward of the inner peripheral edge portion 11 (radially outward from the first rotational center axis O3 of the outer race 3), so that grease that is pushed toward the inner peripheral surface of the outer race 3 by centrifugal force can be actively guided to the inner peripheral side of the outer roller 6, as shown by the arrow in Fig. 7. As a result, grease can be sufficiently and reliably supplied to the sliding parts on the inner peripheral side of the outer roller 6, thereby lubricating them.

[0035] In the above-described embodiments, the passages are so-called straight notched grooves 15 that have a rectangular cross section and extend in the radial direction of the outer roller 6, but the passages in this invention are essentially any portion that can guide a lubricant such as grease from the outer periphery to the inner periphery of the outer roller. Therefore, the shape of the passages may be any appropriate shape as needed, and may be, for example, a through hole, or a shape that intersects at a predetermined angle with the radial direction (radial line) of the outer roller, or that is curved. [Explanation of symbols]

[0036] 1 First rotation axis 2 Second rotation axis 3 Outer Race 4 Tripod 5,51 groove 6 outer roller 7,71 Trunnion 8 Inner roller 9 Needle roller 10 Outer edge 11 Inner edge 12,13,112 Snap ring 14 Lubricant layer 15 Notched groove 16 Groove bottom surface 17 Top side 18 Bottom side 19 Boots O2 central axis of rotation O3 Rotational axis

Claims

1. a tripod-type constant velocity joint in which a groove is formed in an inner peripheral surface of a cylindrical outer race that is attached to a first rotating shaft and rotates, the groove being oriented in the direction of a first central axis of rotation; a tripod is disposed inside the outer race and is connected to a second rotating shaft that rotates about a second central axis of rotation that intersects with the first central axis of rotation at a predetermined angle; the tripod has a trunnion that protrudes in a radial direction relative to the second central axis of rotation; and an outer roller that is inserted into the groove and rotates about an axis along the radial direction of the outer race is rotatably held by the trunnion, the outer roller is ring-shaped and has an outer peripheral edge portion that opens toward the bottom of the groove and an inner peripheral edge portion that opens toward the opposite side from the bottom of the groove, a passage through which a lubricant can flow, penetrating from the outer peripheral surface to the inner peripheral surface of the outer roller, is formed at a portion of the inner peripheral edge portion side that does not contact the inner surface of the groove, A needle roller is disposed on the inner peripheral side of the outer roller, a retaining ring that restricts movement of the needle roller in the axial direction is attached to an inner peripheral surface of the inner peripheral edge portion, The retaining ring is provided with a guide surface that communicates with the passage and extends from the outer peripheral surface of the retaining ring to the inner peripheral surface of the retaining ring. A tripod-type constant velocity joint characterized by:

2. 2. The tripod-type constant velocity joint according to claim 1, The tripod-type constant velocity joint is characterized in that the passage is a notched groove formed by cutting the inner peripheral edge portion in the axial direction of the outer roller.

3. 3. The tripod-type constant velocity joint according to claim 2, The tripod-type constant velocity joint is characterized in that the depth of the notched groove on the inner periphery side of the outer roller is deeper than the depth of the outer periphery side of the outer roller.

4. A tripod-type constant velocity joint in which a groove is formed in the inner surface of a cylindrical outer race that is attached to and rotates on a first rotating shaft, facing in the direction of a first central axis of rotation, a tripod connected to a second rotating shaft that rotates around a second central axis of rotation that intersects with the first central axis of rotation at a predetermined angle is disposed inside the outer race, the tripod has a trunnion that protrudes in a radial direction relative to the second central axis of rotation, and an outer roller that is inserted inside the groove and rotates around an axis along the radial direction of the outer race is rotatably held by the trunnion, the outer roller is ring-shaped and has an outer peripheral edge portion that opens toward the bottom of the groove and an inner peripheral edge portion that opens toward the opposite side from the bottom of the groove, a passage through which a lubricant can flow, penetrating from the outer peripheral surface to the inner peripheral surface of the outer roller, is formed at a portion of the inner peripheral edge portion side that does not contact the inner surface of the groove, the passage is a notched groove formed by cutting the inner peripheral edge portion in the axial direction of the outer roller, A needle roller is disposed on the inner peripheral side of the outer roller, a retaining ring that restricts movement of the needle roller in the axial direction is attached to an inner peripheral surface of the inner peripheral edge portion, the notched groove has a depth on the inner circumferential side of the outer roller that is deeper than a depth on the outer circumferential side of the outer roller, and has a groove bottom surface that guides the lubricant, which flows due to centrifugal force, to the inner circumferential side of the outer roller; the retaining ring has an upper surface that contacts the needle roller and a lower surface opposite the upper surface, The thickness of the retaining ring is thinner on the inner circumferential side than on the outer circumferential side, so that the lower surface is continuous with the groove bottom surface and serves as an inclined guide surface that guides the lubricant, which flows due to centrifugal force, from the outer circumferential part of the retaining ring toward the inner circumferential part. A tripod-type constant velocity joint characterized by:

5. 5. The tripod-type constant velocity joint according to claim 4, the lubricant is placed inside the outer race so that when the outer race rotates, the lubricant adheres to the inner peripheral side of the outer race by centrifugal force to form a lubricant layer of a predetermined thickness, The opening position of the passage on the outer peripheral surface of the outer roller is set on the outer peripheral side of the lubricant layer from the first rotational center axis of the outer race. A tripod-type constant velocity joint characterized by:

6. 2. The tripod-type constant velocity joint according to claim 1, the lubricant is placed inside the outer race so that when the outer race rotates, the lubricant adheres to the inner peripheral side of the outer race by centrifugal force to form a lubricant layer of a predetermined thickness, The opening position of the passage on the outer peripheral surface of the outer roller is set on the outer peripheral side of the lubricant layer from the first rotational center axis of the outer race. A tripod-type constant velocity joint characterized by:

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