JP2012026495A - Housing device of drive-shaft bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve positioning accuracy in an axial direction of a drive-shaft bearing.SOLUTION: The device includes: a bracket 30 and a bearing cap 40 which sandwich the drive-shaft bearing; and a bolt 34 which fastens the bracket and bearing cap at both ends. The bracket 30 has: a pin through-hole 37 that penetrates from a female screw 36 to the external toward the same direction where the drive-shaft bearing 10 faces to an assembly reference surface 35; and a pin 38 that is press-fitted into the pin through-hole 37 and is pressed by a bolt 34 of which one end is screwed into the female screw 36. In addition, the bearing cap 40 is formed integrally with a part 42 to be fastened so as to cover the pin 38, and has a part 45 to be pressed which is pressed by the other end of the pin 38.

Description

  The present invention relates to a bearing housing device that supports a drive shaft of a vehicle.

  Conventionally, a housing device for a bearing (hereinafter referred to as “drive shaft bearing”) for supporting a drive shaft of a vehicle as shown in FIGS. 9 to 11 is known. Reference numeral 10 denotes a drive shaft, and the drive shaft bearing 20 is fitted to the drive shaft 10 in a positioned state. The drive shaft bearing 20 is supported by being sandwiched between a bracket 70 fastened to the vehicle side and a bearing cap 80.

  The bracket 70 includes a support portion 71 that supports a substantially semicircular portion of the outer periphery of the drive shaft bearing 20, bearing cap fastening surfaces 72 that are formed at both ends of the support portion 71 in parallel to the axial direction of the drive shaft 10, By providing a female screw 76 formed in a direction orthogonal to the bearing cap fastening surface 72 and one side surface of the drive shaft bearing 20, the drive shaft bearing 20 is provided to be disposed at an assembly reference position in the axial direction. Assembly reference plane 75 provided. A base portion 73 of the bracket 70 is fastened to the vehicle with bolts 74. As shown in FIG. 10, the support portion 71 has an inner diameter surface 711 corresponding to the outer diameter of the drive shaft bearing 20.

  The bearing cap 80 supports the remaining substantially semicircular portion of the outer periphery of the drive shaft bearing 20 and is configured to engage the drive shaft bearing 20 in the axial direction thereof, and the support portion 81. , And a bolt insertion hole 83 through which the bolt 74 is inserted. The fastening portion 82 is fastened to the bearing cap fastening surface 72. As shown in FIG. 10, the support portion 81 forms a groove corresponding to the outer diameter and width of the drive shaft bearing 20, and the drive shaft bearing 20 is fitted into this groove so that the radial direction of the bearing 20 The position in the axial direction is generally determined.

  The bearing cap 80 is manufactured by press work and is not machined to keep the manufacturing cost low.

  Although Patent Document 1 does not relate to the positioning of the drive shaft bearing, the crankshaft is rotatably supported in the bearing hole of the crankcase via the bearing, and the radial play between the bearing and the bearing hole is unstable. A backlash absorbing means for preventing this is disclosed.

JP 2005-105921 A

  By the way, when the bearing cap 80 is manufactured by press working and is not machined, variation in the groove width dimension W (see FIG. 10) of the support portion 81 into which the drive shaft bearing 20 is fitted. Therefore, there is a problem that an error in positioning the drive shaft bearing 20 in the axial direction tends to be large. In other words, when the bearing cap 80 manufactured by press working is used, the groove width dimension W may vary by about ± 1.0 mm, and an error in positioning the drive shaft bearing 20 in the axial direction accordingly. Could occur.

  If the positioning error of the drive shaft bearing 20 is large, as a result, the error of the axial position of the drive shaft 10 also increases, the engagement amount of the spline fitting portion at the end of the drive shaft 10 is insufficient, or the gear case There is a concern that the contact position of the sealing material attached to the drive shaft 10 becomes inappropriate.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a drive shaft bearing housing device capable of improving the positioning accuracy of the drive shaft bearing in the axial direction. .

  As means for solving the above-described problems, the drive shaft bearing housing device of the present invention is configured as follows.

  That is, a housing device for a drive shaft bearing according to the present invention includes a bracket and a bearing cap that sandwich the drive shaft bearing, and a bolt that fastens the bracket and the bearing cap at both ends, and the bracket is the drive shaft bearing. Bracket-side support that supports a substantially half-circumferential portion of the outer periphery of the bearing, bearing cap fastening surfaces formed in parallel to the axial direction of the drive shaft at both ends of the bracket-side support, and orthogonal to the bearing cap fastening surface A female screw to which the bolt is screwed, and an assembly reference surface for placing the drive shaft bearing at an assembly reference position by contacting one side surface of the drive shaft bearing. And the bearing cap includes the drive shaft base. A bearing cap side support portion formed so as to support the remaining substantially semicircular portion of the outer periphery of the ring and engage with the drive shaft bearing in the axial direction thereof, and formed at both ends of the bearing cap side support portion. In addition, it is assumed that it has a fastened part fastened to the bearing cap fastening surface and a bolt insertion hole through which the bolt is inserted. The bracket is press-fitted into the pin insertion hole, which is penetrated from the female screw to the outside in the same direction as the direction in which the drive shaft bearing faces the assembly reference surface, and one end portion And a pin pressed by the bolt screwed to the female screw, and the bearing cap is formed integrally with the fastened portion so as to cover the pin, and is pressed against the other end of the pin. It further has a pressed part.

  According to the drive shaft bearing housing device having such a configuration, by tightening the bolt, the side surface of the drive shaft bearing is arranged at the assembly reference position, so even if the dimensional accuracy such as the groove width of the bearing cap is low, The positioning accuracy of the drive shaft bearing in the axial direction can be improved.

  According to the drive shaft bearing housing device of the present invention, by tightening the bolt, the side surface of the drive shaft bearing is arranged at the assembly reference position, so that even if the dimensional accuracy such as the groove width of the bearing cap is low, the drive The positioning accuracy in the axial direction of the shaft bearing can be improved.

It is a figure which shows the housing apparatus of the drive shaft bearing which concerns on embodiment of this invention. It is AA sectional drawing of FIG. However, the drive shaft is not sectioned. It is BB sectional drawing of FIG. FIG. 4 is a view taken in the direction of arrow C in FIG. 3, with the bearing cap and the bolt omitted. It is sectional drawing of the bracket corresponding to the BB cross section of FIG. 1, Comprising: It is a figure for demonstrating an assembly | attachment process. It is a figure corresponding to the AA cross section of FIG. 1, Comprising: It is a figure for demonstrating an assembly | attachment process. It is a figure corresponding to the BB cross section of FIG. 1, Comprising: It is a figure for demonstrating an assembly | attachment process. It is a figure corresponding to the BB section of Drawing 1, and is a figure showing before and after dropping of a bolt. It is a figure which shows the housing apparatus of the drive shaft bearing which concerns on a prior art example. It is AA sectional drawing of FIG. However, the drive shaft is not sectioned. It is BB sectional drawing of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 are views showing a drive shaft bearing housing device according to an embodiment of the present invention.

  Reference numeral 10 denotes a drive shaft 10 mounted on the vehicle. A drive shaft bearing 20 is fitted to the drive shaft 10 in a state of being positioned by a C-type retaining ring 11 or the like.

  The drive shaft bearing 20 is supported while being sandwiched between the bracket 30 and the bearing cap 40.

  The bracket 30 includes a support portion 31, a bearing cap fastening surface 32, a female screw 36, an assembly reference surface 35, a pin insertion hole 37, and the like, and the base portion 33 is fixed to the vehicle at an optimum position by bolts 39. ing.

  As shown in FIG. 1, the support portion 31 of the bracket 30 supports a substantially semicircular portion of the outer periphery of the drive shaft bearing 20. As shown in FIG. 2, the support portion 31 has an inner diameter surface 311 corresponding to the outer diameter of the drive shaft bearing 20, and the outer diameter surface of the drive shaft bearing 20 is fitted to the inner diameter surface 311. .

  The bearing cap fastening surfaces 32 are formed in parallel to the axial direction of the drive shaft 10 at both ends of the support portion 31.

  The female screw 36 is formed in a direction orthogonal to the bearing cap fastening surface 32.

  The assembly reference surface 35 is formed on one side in the axial direction of the support portion 31, and the drive shaft bearing 20 is disposed at the assembly reference position by contacting one side surface of the drive shaft bearing 20. The assembling reference position is, for example, the optimum design position of the drive shaft bearing 20.

  The pin insertion hole 37 (see FIG. 3) penetrates from the internal thread 36 to the outside in the same direction as the direction in which the drive shaft bearing 20 faces the assembly reference surface 35. The pin insertion hole 37 is press-fitted with a pin 38 whose one end is pressed by a bolt 34 so that the other end presses a pressed portion 45 of a bearing cap 40 described later.

  The bearing cap 40 includes a support portion 41, a fastened portion 42, a bolt insertion hole 43, a pressed portion 45, and the like. The bearing cap 40 is manufactured by press working in order to keep the manufacturing cost low, and at least a portion in contact with the drive shaft bearing 20 is not machined.

  The support portion 41 of the bearing cap 40 is formed so as to support the remaining substantially semicircular portion of the outer periphery of the drive shaft bearing 20 and to engage the drive shaft bearing 20 in the axial direction thereof. Further, as shown in FIG. 2, the support portion 41 forms a groove corresponding to the outer diameter and width of the drive shaft bearing 20, and the drive shaft bearing 20 is fitted into this groove.

  The fastened portion 42 is formed at both ends of the support portion 41 and fastened to the bearing cap fastening surface 32 with bolts 34. Also, as shown in FIG. 3, flanges 421 a and 421 b that engage with both side walls 301 and 301 of the bracket 30 are formed on both sides of the fastened portion 42.

  A bolt insertion hole 43 (see FIG. 3) is formed in the fastened portion 42, and the bolt 34 is inserted therethrough. A taper portion 341 as shown in FIG. 3 is formed at the tip of the bolt 34.

  The pressed portion 45 is formed in a flange portion 421 b formed integrally with the fastened portion 42 so as to cover the outer end portion of the pin 38, and is pressed by the pin 38 protruding from the bracket 30. Preferably, as shown in FIG. 3, a part of the flange 421 b is recessed in the direction in which the pin 38 protrudes to form a recess 46, and the bottom of the recess 46 is the pressed part 45. desirable.

-Assembly procedure-
Next, a procedure for assembling the drive shaft bearing 20 fitted to the drive shaft 10 to the drive shaft bearing housing device according to the present embodiment will be described. In the following, it is assumed that the bracket 30 is fixed in advance with bolts 39 at an optimal position with respect to the vehicle.

  First, as shown in FIG. 5, the pin 37 is press-fitted into the pin insertion hole 37 of the bracket 30 from the outside. At this time, a clearance is left so that the tip of the bolt 34 enters the tip of the pin 37.

  Next, as shown in FIG. 6, the drive shaft bearing 20 fitted to the drive shaft 10 is fitted to the inner diameter surface 311 of the support portion 31 of the bracket 30, and the support portion 41 of the bearing cap 40 is fitted to the drive shaft bearing 20. As shown in FIG. 7, the bolts 34 are screwed into the female threads 36 of the bracket 30 by aligning the positions of the female threads 36 of the bracket 30 and the bolt insertion holes 43 of the bearing cap 40.

  At this time, as shown in FIG. 7A, the tip of the pin 38 hits the tapered portion 341 of the tip of the bolt 34, and the pin 38 is pushed outward (left side in FIG. 7) as the bolt 34 is screwed. As shown in FIG. 7 (b), the pin 38, part of which is pushed outward, presses the pressed portion 45 of the bearing cap 40 at its outer end, and the entire bearing cap 40 is pushed in the above-described pressing direction. Slide to. As a result, the drive shaft bearing 20 engaged with the groove of the support portion 41 of the bearing cap 40 also slides in the same direction, and the gap L between one side surface of the drive shaft bearing 20 and the assembly reference position 35 shown in FIG. Decrease gradually. As shown in FIG. 2, the one side surface of the drive shaft bearing 20 comes into contact with the assembly reference position 35 to complete the positioning of the drive shaft bearing 20.

  In order to ensure that one side surface of the drive shaft bearing 20 and the assembly reference position 35 are in contact with each other, the length of the pin 38 is the same as the pressed portion 45 indicated by a two-dot chain line in FIG. The pressed part 45 is desirably set to such an extent that it deforms (plastic deformation or elastic deformation).

  According to the drive shaft bearing housing device described above, by tightening the bolt 34, one side surface of the drive shaft bearing 20 comes into contact with the assembly reference position 35, and the drive shaft bearing 20 is positioned at a suitable position. Therefore, even if the dimensional accuracy of the groove dimension W of the bearing cap 40 is low, the positioning accuracy of the drive shaft bearing in the axial direction can be improved.

-Other effects-
Other advantages of the drive shaft bearing housing device according to this embodiment will be described.

  According to the housing device for a drive shaft bearing according to the present embodiment, as shown in FIG. 8A, in a state where the bolt 34 is tightened with respect to the female screw 36, the bolt 34 is gradually loosened due to vibration of the vehicle or the like. As shown in FIG. 8B, even if the bolt 34 is dropped, the drive shaft bearing 20 can be kept in contact with the assembly reference surface 35 for a while.

  That is, even if the bolt 34 falls off, the pin 38 is press-fitted into the pin insertion hole 37, so that a certain sliding resistance is generated in the insertion direction and does not easily enter the female screw 36. It is like that. Further, even if the fastened portion 42 of the bearing cap 40 is separated from the bearing cap fastening surface 32 of the bracket 30 (the fastened portion 42 moves upward in FIG. 8B), the pin 38 engages with the recess 46. Therefore, it is difficult for the bearing cap 40 to fall off the bracket 30.

  As described above, even if the bolt 34 is dropped, the axial position of the bearing cap 40 does not easily change, and the drive shaft bearing 20 can be kept in contact with the assembly reference surface 35 for a while. It has become.

  The present invention is applicable to, for example, a bearing housing device that supports a drive shaft of an automobile.

20 Drive Shaft Bearing 30 Bracket 31 Support Portion 32 Bearing Cap Fastening Surface 34 Bolt 35 Assembly Reference Surface 36 Female Screw 37 Pin Insertion Hole 38 Pin 40 Bearing Cap 41 Support Portion 42 Fastened Portion 43 Bolt Insertion Hole 45 Pressed Portion

Claims (1)

A bracket and a bearing cap for sandwiching the drive shaft bearing, and a bolt for fastening the bracket and the bearing cap at both ends,
The bracket includes a bracket-side support portion that supports a substantially half-circumferential portion of the outer periphery of the drive shaft bearing, a bearing cap fastening surface that is formed at both ends of the bracket-side support portion in parallel to the axial direction of the drive shaft, In order to place the drive shaft bearing at the assembly reference position by contacting a female screw formed in a direction orthogonal to the bearing cap fastening surface and screwed with the one side surface of the drive shaft bearing. Assembly reference plane, and
The bearing cap includes a bearing cap side support portion that is configured to support the remaining substantially half circumferential portion of the outer periphery of the drive shaft bearing and to be engaged with the drive shaft bearing in the axial direction thereof, and the bearing cap side In a housing device for a drive shaft bearing, comprising a fastened portion to be fastened to the bearing cap fastening surface, and a bolt insertion hole through which the bolt is inserted, formed at both ends of the support portion,
The bracket is press-fitted into the pin insertion hole, the pin insertion hole penetrating from the female screw to the outside in the same direction as the direction in which the drive shaft bearing faces the assembly reference surface, and one end portion of the bracket is A pin pressed by the bolt screwed into the female screw,
The bearing cap further includes a pressed portion that is integrally formed with the fastened portion so as to cover the pin and pressed against the other end of the pin.
A drive shaft bearing housing device.

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