JP2010002030A - Tapered roller bearing - Google Patents

Abstract

An object of the present invention is to provide excellent lubrication for sliding parts such as a large-diameter end face located on the large-diameter side of a tapered roller and a roller guide surface of a collar part of an inner ring that is in sliding contact with the large-diameter end face, and is easy to process. To provide a tapered roller bearing that does not affect the strength of the roller.
A large collar portion 62 is formed on the large diameter side in the axial direction of a conical outer circumferential raceway surface 60 of an inner ring 26. A roller guide surface 67 that guides the large-diameter end surface 91 of the tapered roller 27 in the large collar portion 62, is positioned radially outward from the roller guide surface 67, and is axially directed to the large-diameter end surface 91 of the tapered roller 27. And an oil reservoir 69 opposite to the oil reservoir 69.
[Selection] Figure 2

Description

  The present invention relates to a tapered roller bearing used in an environment where a lubricating liquid flows from one axial direction toward the other axial direction between an inner ring and an outer ring.

  The present invention particularly relates to a tapered roller bearing that is preferably used to support the pinion shaft of a vehicle pinion shaft support device having a pinion shaft such as a differential gear device, a transaxle device, or a transfer device.

  Conventionally, as a tapered roller bearing, there is one described in Japanese Utility Model Laid-Open No. 5-38421.

  The tapered roller bearing includes an inner ring, an outer ring, and a plurality of tapered rollers. The inner ring has a conical raceway surface and a flange portion located on the large diameter side of the conical raceway surface. The inner ring has an annular oil reservoir having a spherical cross section at the end on the large diameter side of the conical raceway surface.

  In this tapered roller bearing, oil flowing to the large diameter side of the conical raceway surface by the pumping action of the conical raceway surface of the inner ring is stored in the oil reservoir. The oil accumulated in the oil reservoir lubricates sliding portions such as the large-diameter end surface of the conical outer peripheral surface of the tapered roller and the roller guide surface of the large collar of the inner ring that is in sliding contact with the end surface. ing.

The tapered roller bearing has an advantage that it is excellent in lubrication of sliding portions such as the end surface on the large diameter side of the tapered roller and the roller guide surface of the flange portion of the inner ring, and between the flange portion and the conical raceway surface. Since the annular concave portion is formed in the portion where the curvature is large, the oil reservoir is not easily processed. Further, since the oil reservoir is formed in the vicinity of the conical raceway surface, the strength of the inner ring may be lowered.
Japanese Utility Model Publication No. 5-38421 (FIG. 1)

  Therefore, the object of the present invention is excellent in lubrication of sliding portions such as a large-diameter end surface located on the large-diameter side of the tapered roller and a roller guide surface of a flange portion of the inner ring that is in sliding contact with the large-diameter end surface, and processing. It is easy to provide a tapered roller bearing that does not affect the strength of the inner ring.

In order to solve the above problems, the tapered roller bearing of the present invention is
An outer ring having a conical inner circumferential raceway surface;
An inner ring having a conical outer peripheral raceway surface and a flange located on the large-diameter side in the axial direction of the conical outer peripheral raceway surface;
It is arranged between the outer ring and the inner ring, and has a conical outer peripheral surface, a small-diameter end surface located on the small-diameter side of the conical outer peripheral surface, and a large-diameter end surface located on the large-diameter side of the conical outer peripheral surface. With tapered rollers,
The lubricating liquid flows between the inner ring and the outer ring from the small diameter side to the large diameter side of the conical inner circumferential raceway surface in the axial direction,
The above buttocks
A roller guide surface for guiding the large-diameter end surface of the tapered roller;
It is characterized by having a lubricating liquid reservoir that is positioned radially outward from the roller guide surface and that is axially opposed to the large-diameter end surface of the tapered roller.

  This tapered roller bearing is used in an environment where lubricating liquid (for example, lubricating oil or cleaning liquid) flows between the inner ring and outer ring from the small diameter side to the large diameter side of the conical inner raceway surface of the inner ring in the axial direction. Is done.

  According to the present invention, since the inner ring has the lubricating liquid reservoir portion facing the axial direction on the end surface on the large diameter side of the outer peripheral surface of the tapered roller, the axial inner periphery of the cone is formed between the inner ring and the outer ring. The lubricating liquid flowing from the small diameter side to the large diameter side of the raceway surface can be stored in the lubricating liquid reservoir, and the lubricating liquid stored in the lubricating liquid reservoir can be axially stored in the lubricating liquid reservoir. It can be efficiently supplied to the large-diameter end faces of the opposing tapered rollers. Therefore, the performance of lubricating the sliding portion such as the above-mentioned large-diameter end surface of the tapered roller and the roller guide surface of the flange portion of the inner ring that is in sliding contact with the large-diameter end surface is excellent.

  In addition, according to the present invention, the lubricating liquid reservoir is located at the outer side in the radial direction from the roller guide surface in the collar portion, and is located at a position where the tool can be easily contacted. The part can be easily processed.

  Further, according to the present invention, the lubricating liquid reservoir is located radially outward from the roller guide surface at the flange portion, and the lubricating liquid reservoir is a portion that hardly applies a load to the inner ring. Therefore, the strength of the inner ring is hardly lowered by the processing of the lubricating liquid reservoir.

In one embodiment,
The above buttocks
The inner ring is connected to the large-diameter end of the conical outer peripheral raceway surface of the inner ring, and the outer peripheral surface extends axially outward from the radially outer end of the roller guide surface and the roller guide surface. A first portion having:
The outer peripheral surface of the first part is fitted and fixed, and has an annular second part having the lubricating liquid reservoir.

  According to the above embodiment, the portion (first portion) having the roller guide surface in the collar portion and the portion (second portion) having the lubricating liquid reservoir in the collar portion are connected to the conical outer peripheral raceway surface of the inner ring. Since it is a separate body, the lubricating liquid reservoir can be formed by processing only the second portion. In addition, when the lubricating liquid reservoir has deteriorated, the second part is replaced with a new second part, and after the second part is removed from the first part, the second part is repaired, and then again. By press-fitting into the first portion, the function of the lubricating liquid reservoir can be restored easily and quickly.

  The pinion shaft in a vehicle pinion shaft support device that includes a case, a differential mechanism including a ring gear, and a pinion shaft having a pinion gear that meshes with the ring gear of the differential mechanism, is provided in the case. When the tapered roller bearing of the present invention is used as a freely supporting tapered roller bearing, seizure of the tapered roller bearing can be suppressed in the vehicle pinion shaft support device, and the tapered roller bearing can be easily processed. Can do.

  According to the tapered roller bearing of the present invention, the performance of lubricating the sliding portion such as the large-diameter end surface of the tapered roller and the roller guide surface of the flange portion of the inner ring that is in sliding contact with the large-diameter end surface is excellent.

  In addition, according to the tapered roller bearing of the present invention, the lubricating liquid reservoir is positioned radially outward from the roller guide surface in the collar portion, and is positioned at a position where the tool can be easily contacted. The lubricating liquid reservoir can be easily processed.

  Further, according to the tapered roller bearing of the present invention, the lubricating liquid reservoir is positioned radially outward from the roller guide surface in the collar portion, and the lubricating liquid reservoir hardly loads the inner ring. Since it is formed in the portion, the strength of the inner ring is hardly reduced by processing the lubricating liquid reservoir.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a vertical sectional view including a central axis 11 of a pinion shaft 3 of a differential gear device including a tapered roller bearing according to an embodiment of the present invention. In FIG. 1, arrows indicate the flow of oil as an example of the lubricating liquid.

  This differential gear device includes a case 1, a differential mechanism 2, a pinion shaft 3, a tapered roller bearing 5, and a tapered roller bearing 7 according to an embodiment of the present invention.

  The differential mechanism 2 is provided in the case 1. The differential mechanism 2 includes a ring gear 8, a side gear (not shown), and the like, and the ring gear 8 meshes with the pinion gear 10 of the pinion shaft 3. The differential mechanism 2 receives two powers from the drive shaft via the pinion gear 10 of the pinion shaft 3, and is arranged on each side of the differential mechanism 2 on both sides in the direction perpendicular to the paper surface of FIG. The rotational speed difference of the wheel shaft (not shown) is adjusted as appropriate.

  The tapered roller bearing 5 includes an outer ring 15, an inner ring 16, and a tapered roller 17. The outer ring 15 is fitted and fixed to the inner wall 19 in the case 1, while the inner ring 16 is fitted and fixed to the pinion shaft 3. A plurality of the tapered rollers 17 are arranged at substantially equal intervals in the circumferential direction with a constant interval in a state of being held by a cage between the conical raceway surface of the outer ring 15 and the conical raceway surface of the inner ring 16. Yes. The tapered roller bearing 5 is disposed on the head side portion of the pinion shaft 3, that is, on the pinion gear 10 side portion of the pinion shaft 3, and rotatably supports the pinion shaft 3.

  On the other hand, the tapered roller bearing 7 includes an outer ring 25, an inner ring 26, and a tapered roller 27. The tapered rollers 27 are held by a cage (not shown) between the conical raceway surface of the outer ring 25 and the conical raceway surface of the inner ring 26 and are spaced at regular intervals in the circumferential direction. Is arranged in multiple. The tapered roller bearing 7 is disposed at a portion on the tail side of the pinion shaft 3, that is, a portion further away from the pinion gear 10 than a portion of the pinion shaft 3 where the tapered roller bearing device 5 is disposed. It is supported rotatably.

  The differential gear device is disposed between an engine (not shown) and an axle of a wheel installed at a position lower than the engine, and the differential gear device is located on the side of the pinion shaft 3 opposite to the pinion gear 10 side. The height of one end is higher than the height of the other end of the pinion shaft 3 on the pinion gear 10 side. Specifically, the nose angle that is the angle formed by the central axis 11 of the pinion shaft 3 and the horizontal plane P is set to a predetermined set nose angle θ.

  In the above configuration, the differential gear device transmits the power of a drive shaft (not shown) to the differential mechanism 2 via the pinion shaft 3 to drive the differential mechanism 2. And the rotational speed difference of the two wheel shafts (not shown) connected with each of the coupling (not shown) arrange | positioned at the side of the said differential mechanism 2 is adjusted suitably.

  In the differential gear device, when the pinion shaft 3 is rotating during operation, the oil in the differential case is splashed upward by the ring gear 8 meshing with the pinion gear 10 of the pinion shaft 3. The oil splashed upward is supplied to gears such as the pinion gear 10, the ring gear 8 of the differential mechanism 2, and the side gear of the differential mechanism 2 through an oil introduction path formed in the differential case, The seizure of these gears is prevented.

  Further, during operation, the oil splashed upward by the ring gear 8 is tapered roller bearings as shown by arrows a, b, c, d, e, f, g, h, i, j, k in FIG. In each of 5 and the tapered roller bearing 7, the tapered roller bearing 5 and the tapered roller bearing 7 are lubricated by flowing from the small diameter side to the large diameter side of the conical outer raceway surface of the inner rings 16 and 26.

  FIG. 2 is a sectional view of the tapered roller bearing 7 in the axial direction.

  As described above, the tapered roller bearing 7 includes the outer ring 25, the inner ring 26, and the tapered roller 27.

  The outer ring 25 has a conical inner circumferential raceway surface 50. On the other hand, the inner ring 26 has a conical outer peripheral raceway surface 60, a small collar part 61, and a large collar part 62.

  The small flange portion 61 is located on the small diameter side of the conical outer periphery raceway surface 61, while the large collar portion 62 is located on the large diameter side of the cone outer periphery raceway surface 61. The tapered roller 26 has a conical outer peripheral surface 90, a large-diameter end surface 91, and a small-diameter end surface 92, and the large-diameter end surface 91 is located on the large-diameter side of the conical outer peripheral surface 90, while Located on the small diameter side.

  The large collar portion 62 includes a first portion 40 and a second portion 41.

  The first portion 40 is connected to the large-diameter end of the conical outer peripheral raceway surface 60 of the inner ring 26. The first portion 40 has a roller guide surface 67 and a cylindrical outer peripheral surface 94.

  The roller guide surface 67 guides the large-diameter end surface 91 of the tapered roller 27. The roller guide surface 67 slides on the large diameter end surface 91 of the tapered roller 27. The roller guide surface 67 has a substantially conical inner peripheral surface.

  The cylindrical outer peripheral surface 94 is connected to the radially outer end of the roller guide surface 67. The cylindrical outer peripheral surface 94 extends in a substantially axial direction from the radially outer end of the roller guide surface 67 to the end surface on the larger diameter side of the conical raceway surface 60 of the inner ring 26.

  On the other hand, the second portion 41 is an annular member. The second portion 41 is externally fitted and fixed to the first portion 40. The second portion 41 has a tapered roller side end surface 97 extending in a substantially radial direction and a cylindrical inner peripheral surface 98. Before the second portion 41 is externally fitted to the first portion 40, the inner diameter of the cylindrical inner peripheral surface 98 of the second portion 41 is slightly smaller than the outer diameter of the cylindrical outer peripheral surface 94 of the first portion 40. . The cylindrical inner peripheral surface 98 of the second portion 41 is press-fitted into the cylindrical outer peripheral surface 94 of the first portion 40 so that the tapered roller side end surface 97 is positioned on the tapered roller 27 side. In this way, the second portion 41 is fixed to the first portion 40.

  The second portion 41 has a main body 68 and an oil reservoir 69 that is a lubricating liquid reservoir. The main body 68 has an annular recess having a substantially rectangular cross section on one end face in the axial direction. The oil reservoir 69 is formed by inserting and fixing an annular oil-impregnating resin that matches the shape of the recess or an annular felt that matches the shape of the recess into the recess of the main body 68.

  The oil reservoir 69 is located radially outward from the roller guide surface 67 of the first portion 40. The oil reservoir 69 is annular and has a substantially rectangular cross section. The oil reservoir 69 is exposed at the tapered roller side end surface 97. The oil reservoir 69 faces the large diameter end surface 91 of the tapered roller 27 in the axial direction.

  The plurality of tapered rollers 27 are spaced apart from each other in the circumferential direction while being held by a cage 47 between the conical inner peripheral raceway surface 50 of the outer ring 25 and the conical outer peripheral raceway surface 60 of the inner ring 26. Has been placed. In the retainer 47, a portion 88 positioned axially outward from the large-diameter end surface 69 of the tapered roller 27 is located at a radial distance from the second portion 41.

  According to the tapered roller bearing of the above-described embodiment, the oil reservoir 69 is located radially outward from the roller guide surface 67 in the large collar portion 62, and is located at a position where the tool can be easily contacted. Thus, the oil reservoir 69 can be easily processed.

  Further, according to the tapered roller bearing of the above-described embodiment, the oil reservoir 69 is positioned radially outward from the roller guide surface 69 in the large collar portion 62, and the oil reservoir 69 is in the inner ring 26. Since it is formed in the portion where the load is hardly applied, the strength of the inner ring 26 is hardly lowered by the processing of the oil reservoir 69.

  Further, according to the tapered roller bearing of the above-described embodiment, the first portion 40 having the roller guide surface 67 in the large collar portion 62 and the oil reservoir portion in the large collar portion 41 is connected to the conical outer peripheral raceway surface 60 of the inner ring 26. Since the second portion 41 having 69 is a separate body, the oil reservoir 69 can be formed by processing only the second portion 41. In addition, when the oil reservoir 69 deteriorates due to wear or the like, the second portion 41 is replaced with a new second portion 41, and the second portion 41 is removed from the first portion 40. The function of the oil reservoir 69 can be restored easily and quickly by repairing the two portions 41 and press-fitting into the first portion 40 again.

  In the tapered roller bearing of the above embodiment, the first portion 40 of the large collar portion 62 having the roller guide surface 67 and the second portion 41 of the large collar portion 62 having the oil reservoir 69 are separate bodies. However, in this invention, the 1st part of the large collar part which has a roller guide surface, and the 2nd part of the large collar part which has an oil reservoir part may be integrated.

  In the tapered roller bearing of the above embodiment, the oil reservoir 69 is annular. However, in the present invention, the oil reservoir does not have to be annular. The two portions may be present at a plurality of locations at regular intervals or non-uniform intervals in the circumferential direction. In addition, the oil reservoir may be simply formed at one place in a predetermined region (not the entire circumference) in the circumferential direction in the second portion of the large collar portion.

  In the tapered roller bearing of the above embodiment, in the oil reservoir 69, the plane facing the large-diameter end surface 91 of the tapered roller 27 in the axial direction extends substantially in the radial direction. In the oil reservoir, the plane that faces the large-diameter end surface of the tapered roller in the axial direction does not have to extend in the substantially radial direction, for example, is parallel to the large-diameter end surface of the tapered roller. As long as it is not in contact with the large-diameter end face of the roller, it may extend in any direction. Further, in the oil reservoir, the surface facing the large diameter end surface of the tapered roller in the axial direction may be a curved surface.

  In the tapered roller bearing of the above-described embodiment, the oil reservoir 69 is formed in an annular recess that opens in the axial direction of the main body 68 of the second portion 41, or an annular oil-impregnated resin that matches the recess shape, or An annular felt that matches the shape of the recess was fitted and fixed. However, in the present invention, the oil reservoir has an annular or non-annular recess that opens in the axial direction of the main body portion of the second portion, and has an annular or non-annular shape that matches the shape of the recess. A member made of a material other than felt and a material impregnated with oil or a material having a property of penetrating oil may be fitted and fixed.

  In the tapered roller bearing of the above-described embodiment, the oil reservoir 69 is formed in an annular recess that opens in the axial direction of the main body 68 of the second portion 41, or an annular oil-impregnated resin that matches the recess shape, or In the present invention, an annular felt that matches the shape of the recess is fitted and fixed. However, in this invention, as shown in FIG. 3, the oil reservoir is larger than the roller guide surface 167 in the large collar portion 162 of the inner ring 126. The annular recess 169 itself formed so as to open in the axial direction may be formed in the second portion 141 positioned above in the radial direction. Even when the oil reservoir is formed in this way, the oil flowing from the small diameter side to the large diameter side of the conical outer circumferential raceway surface 160 of the inner ring 126 can be accumulated in the annular recess 169, and from the recess 169 This is because the oil in the recess 169 can be supplied to the large-diameter end surface 91 of the tapered roller 27.

  As shown in FIG. 3, an annular recess as an oil reservoir formed so as to open in the axial direction in the second portion located radially above the roller guide surface in the large collar portion of the inner ring is as shown in FIG. The first portion 140 may be opened radially inward, and the first portion 140 may not be opened radially inward.

  Further, the tapered roller bearing 7 of the above embodiment is installed in an environment where oil flows between the outer ring 25 and the inner rings 26 and 126 from one side to the other side in the axial direction. A lubricating liquid other than oil or the like may be installed in an environment in which the fluid flows between the outer ring and the inner ring from one to the other in the axial direction.

  The tapered roller bearing 7 of the above embodiment is arranged on the tail side of the pinion shaft 3 of the differential gear device. However, the tapered roller bearing of the present invention may be arranged on the head side of the pinion shaft of the differential gear device. good. Further, the tapered roller bearing of the present invention may be arranged on both the tail side and the head side of the pinion shaft of the differential gear device. Further, the tapered roller of the present invention may be disposed on at least one of a head side and a tail side of a pinion shaft of a vehicle pinion shaft support device other than a differential gear device such as a transaxle device or a transfer device.

It is sectional drawing of the perpendicular direction containing the center axis | shaft of the pinion shaft of a differential gear apparatus provided with the tapered roller bearing of one Embodiment of this invention. It is sectional drawing of the axial direction of the tapered roller bearing of the said one Embodiment. It is sectional drawing of the axial direction of the tapered roller bearing of a modification.

Explanation of symbols

25 Outer ring 26,126 Inner ring 27 Tapered roller 40,140 First part 41,141 Second part 47 Cage 50 Cone inner peripheral surface 60,160 Cone outer peripheral surface 62,162 Large collar 67,167 Roller guide surface 69,169 Oil reservoir 91 Large diameter end face of tapered roller

Claims (2)

An outer ring having a conical inner circumferential raceway surface;
An inner ring having a conical outer peripheral raceway surface and a flange located on the large-diameter side in the axial direction of the conical outer peripheral raceway surface;
It is arranged between the outer ring and the inner ring, and has a conical outer peripheral surface, a small-diameter end surface located on the small-diameter side of the conical outer peripheral surface, and a large-diameter end surface located on the large-diameter side of the conical outer peripheral surface. With tapered rollers,
The lubricating liquid flows between the inner ring and the outer ring from the small diameter side to the large diameter side of the conical inner circumferential raceway surface in the axial direction,
The above buttocks
A roller guide surface for guiding the large-diameter end surface of the tapered roller;
A tapered roller bearing comprising: a lubricating liquid reservoir portion positioned radially outward from the roller guide surface and axially opposed to the large-diameter end surface of the tapered roller. The tapered roller bearing according to claim 1,
The above buttocks
The inner ring is connected to the large-diameter end of the conical outer peripheral raceway surface of the inner ring, and the outer peripheral surface extends axially outward from the radially outer end of the roller guide surface and the roller guide surface. A first portion having:
A tapered roller bearing comprising: an annular second portion having the lubricating liquid reservoir portion and being fitted and fixed to the outer peripheral surface of the first portion.

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