JP2006132676A - Connection structure of ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the connection structure of the ball bearing that can fix certainly an inner and an outer race of the ball bearing to a rotary member and a base member respectively without deforming them. <P>SOLUTION: The rotary member 16 has a shaft part 23b arranged by penetrating the inner race 29c of the ball bearing 29, and a support part 32 to receive one side of the inner race 29c on one side of the bearing 29 and a screw groove 34 for screwing a nut member 36 to pinch the inner race 29c in cooperation with the support part are formed to the shaft part. A base member 22 has a ball bearing hole 30 to accept the outer race 29b of the ball bearing 29, and a support part 35 to receive one side of the outer race 29b on one side of the bearing 29 and a screw groove 31 for screwing a male screw member 37 to pinch the outer race 29b in cooperation with the support part are formed to the ball bearing hole. The inner race 29c and the outer race 29b are connected to the base member 22 and the rotary member respectively 16 by screwing both screw members 36, 37. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a coupling structure of a rolling bearing that rotatably supports a rotating member on a base member.

  One type of bearing that rotatably supports a rotating shaft on a housing is a rolling bearing. The rolling bearing has an inner ring, an outer ring, and rolling elements between the two rings. The inner ring is coupled to the rotating shaft, and the outer ring is coupled to the housing, whereby the rotating shaft is rotatably supported by the housing. .

By the way, because of the coupling between the inner ring and the rotating shaft, the rotating shaft is press-fitted into the inner ring, and the inner ring is fixed to the rotating shaft by this press-fitting. A holding portion for the outer ring is formed in the housing, and the outer ring is fixed to the housing by caulking of the holding portion (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-122861 (page 3-4, FIG. 1)

  However, if the outer ring is fixed to a base member such as a housing by such caulking, the outer ring may be deformed by caulking force acting on the holding portion of the base member during the caulking operation. Further, when a rotating member such as a rotating shaft is press-fitted into the inner ring, the inner ring may be deformed by the press-fitting. Such deformation of the outer ring or the inner ring hinders smooth operation of the rolling bearing.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing coupling structure that can reliably fix an inner ring and an outer ring of a rolling bearing to each of a rotating member and a base member without causing deformation thereof.

  The present invention relates to a coupling structure of a rolling bearing having an inner ring, an outer ring, and rolling elements between the two rings, and a base member and a rotating member connected via the rolling bearing, the rotating member penetrating the inner ring. A shaft portion disposed in the shaft, a support portion that receives one side of the inner ring on one side of the rolling bearing, and a screw of a female screw member that clamps the inner ring together with the support portion. And the base member has a bearing hole that receives the outer ring, and the bearing hole receives the one side of the outer ring on the one side of the rolling bearing. And a screw groove for screwing a male screw member that clamps the outer ring in cooperation with the support portion.

  In the coupling structure according to the present invention, the inner ring is clamped from both sides by a support portion formed on a shaft portion that passes through the inner ring and a female screw member that is screwed to the shaft portion, and is rotated by tightening the female screw member. Coupled to the member. The outer ring is clamped from both sides by a support portion formed in a bearing hole that receives the outer ring and a male screw member that is screwed into the bearing hole, and is coupled to the base member by tightening the male screw member. Therefore, by tightening the screw members, the inner ring and the outer ring can be coupled to the rotating member and the base member relatively easily and reliably without deforming the inner ring and the outer ring in the respective radial directions.

  Further, by tightening each screw member with a predetermined tightening torque, the coupling strength of the rolling bearing can be properly maintained, and a predetermined pull-out strength with no variation can be given to each rolling bearing.

  In addition, since the inner ring and the outer ring are respectively fixed by the screw members, the rolling bearing can be detached from the rotating member and the base member without damaging the rolling bearing by rotating the screw members.

  The male screw member screwed into the bearing hole can be a cap-like male screw member covering the female screw member screwed into the shaft portion. Since the cap-shaped male screw member can cover the other side of the rolling bearing, it is possible to reliably prevent foreign matter from entering from the other side between the inner ring and the outer ring.

  In addition, an operating portion that enables a rotational operation with the same tool can be formed on both the screw members, whereby the respective screw members can be operated to rotate in the coupling operation of the rolling bearing to the rotating member and the base member. Since it is not necessary to replace the tool, it is possible to speed up the coupling work of the rolling bearings.

  According to the present invention, as described above, the inner ring and the outer ring are deformed in the respective radial directions by tightening the female screw member screwed into the shaft portion of the rotating member and the male screw member screwed into the bearing hole of the base member. Therefore, the rolling bearing can be reliably coupled to each of the rotating member and the base member without hindering smooth bearing action.

  The present invention will be described below with reference to illustrated embodiments.

  FIG. 1 schematically shows an automatic transmission 10 for a vehicle according to the present invention. The automatic transmission 10 incorporates an assist mechanism 12 that assists the driver of the vehicle in operating the shift lever 11.

  In this vehicle automatic transmission device 10 with an assist mechanism, for example, as disclosed in Japanese Patent Application Laid-Open No. 2003-4135, the driver moves the shift lever 11 to, for example, the P range (stop) according to the driving situation of the automobile. In order to switch from one of the R range (reverse), N range (neutral), D range (forward), and L range (low gear forward) to another desired range position, the shift lever 11 has its pivot shaft. When an operating force around 11 a is applied, this operating force is transmitted to the torque sensor 15 incorporated in the assist actuator 14 via the link mechanism 13.

  In the illustrated example, the torque sensor 15 is incorporated in a rotation shaft 17a of the gear formed integrally with the gear 17 meshing with the worm 16 of the assist actuator 14, and when the operating force acts on the rotation shaft 17a. The acting force is detected as torque. When this torque value exceeds the threshold value, the torque sensor 15 activates the electric motor 19 via the control circuit 18 of the assist actuator 14. When the worm 16 coupled to the rotation shaft of the electric motor 19 is rotated by the activation of the electric motor 19, the rotation shaft 17 a of the gear is driven by the electric rotational force of the electric motor 19 through the gear 17 meshing with the worm. Driven and rotated. This driving torque is transmitted to a transmission mechanism (not shown) via a lever 20 fixed to the rotating shaft 17a and a transmission cable 21 connected to the lever.

  Accordingly, the driver can switch and operate the shift lever 11 with a slight operating force exceeding the threshold set in the torque sensor 15.

  As shown in FIG. 2 in an enlarged manner, the bearing according to the present invention is used to rotatably support the worm 16 on an actuator base 22 that is a base member using the worm 16 as a rotating member.

  The worm 16 has a worm portion 16a at the center, and shaft portions 23a and 23b whose axis lines coincide with the worm portion 16a at both ends thereof. The actuator base 22 has a cylindrical housing portion 24 for accommodating the worm 16, and an opening 25 for receiving the gear 17 (see FIG. 1) meshing with the worm portion 16a is provided at the upper portion of the housing. Is formed. In addition, bearing portions 26 a and 26 b for supporting the shaft portions 23 a and 23 b of the worm 16 are formed at both ends of the housing portion 24.

  One shaft portion 23a of the worm 16 is formed with a serration portion 27 that serration-couples to the rotation shaft 19a of the electric motor 19, and one end of the worm 16 is an outer periphery of the serration portion 27, and the rolling element is a ball 28a. The bearing portion 26a of the actuator base 22 is rotatably supported via a rolling bearing 28 composed of In the illustrated example, the rolling bearing 28 has an outer ring 28b press-fitted into the bearing part 26a of the actuator base 22 as in the prior art, and a serration part 27 is press-fitted into the inner ring 28c. The outer ring 28b and the inner ring 28c of the rolling bearing 28 are coupled to one bearing portion 26a of the actuator base 22 and one shaft portion 23a of the worm 16 by press fitting.

  In addition, the other shaft portion 23 b of the worm 16 that is the rotating member is rotatably supported by the other bearing portion 26 b of the actuator base 22 that is the base member via the rolling bearing 29. The bonding structure of the present invention is applied to the bonding.

  That is, as shown in an enlarged view in FIG. 3, a bearing hole 30 that allows insertion of the shaft portion 23b is formed in the bearing portion 26b of the actuator base 22 that receives the shaft portion 23b of the worm 16. The diameter of the bearing hole 30 increases stepwise toward the outer end of the shaft portion 23b. In the illustrated example, a small-diameter portion 30a, an intermediate-diameter portion 30b, and a large-diameter portion 30c are formed. A female thread groove 31 is formed on the peripheral surface of the bore portion 30c.

  Further, the shaft portion 23 b is provided with a flange portion 32 that is formed at a distance from the peripheral wall of the small-diameter portion corresponding to the small-diameter portion 30 a of the bearing hole 30. A fitting portion 33 for receiving the inner ring 29c of the rolling bearing 29 is formed at a portion corresponding to the intermediate diameter portion 30b of the bearing hole 30 on the outer end side of the flange portion 32 of the shaft portion 23b. A male screw groove 34 is formed at the distal end portion of the shaft portion 23b on the outer end side of the fitting portion 33.

  In the illustrated example, the rolling bearing 29 is a ball bearing having a rolling element 29a composed of balls, an outer ring 29b, and an inner ring 29c. The rolling bearing 29 has an inner ring 29c that receives the fitting part 33 of the shaft part 23b, and an outer ring 29b that fits the intermediate diameter part 30b of the bearing hole 30 from the large diameter part 30c side. The shaft portion 23b is inserted between the bearing portion 26b. By inserting the rolling bearing 29, the inner ring 29c can be brought into contact with the flange portion 32 of the shaft portion 23b inside the rolling bearing, and the outer ring 29b is formed between the small bore portion 30a and the intermediate bore portion 30b. It can contact the end surface 35a of the step portion 35 formed therebetween.

  After the rolling bearing 29 is inserted, a hexagon nut 36 as a female screw member is screwed into the male screw groove 34 of the shaft portion 23b. The hexagonal nut 36 has a peripheral wall of the nut 36 with a large diameter portion 30c of the bearing hole 30 so that the edge of the hexagonal nut does not protrude to the side of the outer ring 29b and can be rotated with a hexagon wrench (not shown). Leave a sufficient distance from the peripheral wall surface. Therefore, by tightening the hexagon nut 36 using a hexagon wrench, the inner ring 29c of the rolling bearing 29 is tightened between the hexagon nut and the flange portion 32 with an appropriate tightening torque that does not cause deformation or damage to the inner ring. By this tightening, the inner ring 29c of the rolling bearing 29 can be fixedly coupled to the shaft portion 23b.

  After the hexagon nut 36 is tightened, the male screw member 37 is screwed into the female screw groove 31 of the large diameter portion 30c of the bearing portion 26b. As shown in FIGS. 4A and 4B, the male screw member 37 has a head portion 37a having the same planar shape as the planar shape of the hexagon nut 36 and a cylindrical shape extending from the edge of the head portion. And a skirt portion 37b capable of receiving the hexagon nut 36 screwed into the shaft portion 23b inward, and a male screw groove 38 to be screwed into the female screw groove 31 is formed on the outer peripheral surface of the skirt portion.

  As shown in FIG. 3, the male screw member 37 has the male screw groove 38 of the skirt portion 37b screwed into the female screw groove 31 of the large-diameter portion 30c of the bearing portion 26b, whereby the tip 37c of the skirt portion 37b has a large-diameter. It can be made to penetrate between the peripheral wall of the portion 30 c and the hexagon nut 36. Accordingly, the male screw member 37 can be rotated by using the hexagon wrench that can be engaged with the head portion 37 a, and the tip 37 c of the skirt portion 37 b is engaged with the outside of the outer ring 29 b of the rolling bearing 29 by this rotation operation. Can be made. Further, by tightening the male screw member 37, the outer ring 29 b of the rolling bearing 29 is not deformed or damaged between the skirt portion 37 b of the male screw member and the end surface 35 a of the step portion 35 of the bearing hole 30. The outer ring can be properly tightened. By this tightening, the outer ring 29 b of the rolling bearing 29 can be fixedly coupled to the other bearing portion 26 b of the actuator base 22.

  In the coupling structure according to the present invention, the inner ring 29c of the rolling bearing 29 includes a flange part 32 that is a support part formed on the shaft part 23b that passes through the inner ring, and a hexagon that is a female screw member that is screwed into the shaft part 23b. The nut 36 is clamped from both sides, and is coupled to the rotating member 16 by tightening the female screw member 36. Further, the outer ring 29b of the rolling bearing 29 is sandwiched from both sides by a step portion 35, which is a support portion formed in the bearing hole 30 for receiving the outer ring, and a male screw member 37 screwed into the bearing hole 30. When the male screw member 37 is tightened, it is coupled to the actuator base 22 which is a base member.

  Accordingly, by tightening the screw members 36 and 37, the inner ring 29c and the outer ring 29b of the rolling bearing 29 are not deformed in the respective radial directions, and these can be relatively easily and reliably made to the rotary member 16 and the base member 22, respectively. Can be combined.

  Further, by tightening the screw members 36 and 37 with a predetermined tightening torque, the coupling strength of the rolling bearing 29 can be properly maintained, and a predetermined pull-out strength with no variation can be given to each rolling bearing 29. it can.

  Since the inner ring 29c and the outer ring 29b of the rolling bearing 29 are fixed by the screw members 36 and 37, respectively, the rotating member 16 is not damaged by the rotation operation of the screw members 36 and 37 without damaging the rolling bearing 29. And can be removed from each of the base members 22.

  Further, since the male screw member 37 screwed into the bearing hole 30 covers the other side, that is, the outer side of the rolling bearing 29 with the skirt portion 37b, foreign matter can be reliably prevented from entering between the inner ring 29c and the outer ring 29b from the outer side. can do.

  Further, as described above, by giving the same hexagonal plane shape to the main body or the head serving as the operating portion of the both screw members 36 and 37, it becomes possible to perform the rotating operation with the same tool. There is no need to replace tools for rotating the screw members 36 and 37 in the connecting operation to the member 16 and the base member 22, thereby speeding up the connecting operation of the rolling bearing 29.

  By using a female screw member such as a wing nut as the female screw member 36, the female screw member can be tightened without using a tool.

  In the above description, the rolling bearing coupling structure according to the present invention has been described along with an example in which the rolling bearing coupling structure is applied to a rolling bearing incorporated in an automatic transmission of an automobile. However, the present invention is not limited to this, and is applicable to coupling of various rolling bearings. can do.

It is the schematic which shows typically the automatic transmission of the motor vehicle to which the rolling bearing which concerns on this invention is applied. It is a longitudinal cross-sectional view which shows the rolling bearing integrated in the assist actuator of the automatic transmission apparatus shown in FIG. It is a fragmentary sectional view which expands and shows the rolling bearing shown in FIG. 4A is a plan view of the male screw member shown in FIG. 3, and FIG. 4B is a cross-sectional view taken along line IV-IV shown in FIG. 4A.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle automatic transmission 16 (Rotating member) Worm 17 Gear 22 (Base member) Actuator base 23b Shaft part 24 Housing part 25 Opening part 26b Bearing part 29 Rolling bearing 29a (Ball) Rolling element 29b Outer ring 29c Inner ring 30 Bearing hole 31 Female thread groove 32 (support part) Flange part 33 Fitting part 34 Male thread groove 35 (Support part) Step part 36 (Female thread member) Hex nut 37 Male thread member 38 Male thread groove

Claims (1)

A coupling structure of a rolling bearing having an inner ring, an outer ring, and rolling elements between the two rings, and a base member and a rotating member connected via the rolling bearing,
The rotating member has a shaft portion that is disposed through the inner ring, and the shaft portion includes a support portion that receives one side of the inner ring on one side of the rolling bearing, and a joint portion with the support portion. A thread groove for screwing of the female screw member sandwiching the inner ring is formed,
The base member has a bearing hole that receives the outer ring, and a support portion that receives one side of the outer ring on the one side of the rolling bearing in the bearing hole, and holds the outer ring in cooperation with the support portion. And a thread groove for threading the male screw member is formed,
A rolling bearing coupling structure, wherein the inner ring and the outer ring are coupled to the base member and the rotating member, respectively, by tightening the screw members.

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