JP4017012B2 - Rotating electric machine for vehicle having bolt through hole - Google Patents

Description

  The present invention relates to a vehicular rotating electrical machine having a bolt through hole and a bolt fastening structure.

  In JP-A-2-41650 and JP-A-10-248191, a plurality of bolt through holes are formed in a direction (tangential direction) perpendicular to the axis of an AC generator for a vehicle which is a kind of rotating electrical machine for vehicles. The side mount structure which fastens the rotating electrical machine for vehicles to the engine body side is proposed.

  In the conventional bolt fastening structure for a vehicular rotating electrical machine, each bolt pass-through is used to simplify the alignment operation between each bolt through-hole on the vehicular rotating electrical machine side and each internal threaded hole on the engine side and to absorb variations in manufacturing dimensions. It was necessary to form holes with a large diameter by a predetermined margin.

  This problem is particularly important when bolts are fastened to female screw holes provided in both the cylinder block and the cylinder head. This is because the cylinder head is fastened to the cylinder block via a gasket, so that the positions of the female screw hole provided in the cylinder block and the female screw hole provided in the cylinder head inevitably vary.

  However, the larger the diameter of the bolt through-hole, the easier the installation work, including the alignment work, but the pulley position of the vehicle rotating electrical machine will deviate from the optimal position, which may cause premature belt wear and friction loss. Since problems such as increase are derived, it has been common to manufacture bolt through holes with high precision by cutting.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a vehicular rotating electrical machine and a bolt having a bolt through hole that can simplify the mounting operation while preventing a decrease in mounting accuracy of a fastened member such as a vehicular rotating electrical machine. The purpose is to provide a fastening structure.

  The rotating electrical machine for a vehicle according to claim 1, wherein the first bolt through hole having a minimum diameter penetrating through the housing in a substantially tangential direction of the shaft, and the first shaft through the shaft center of the first shaft. A second bolt through-hole located on the opposite side of the bolt through-hole and penetrating through the housing in the substantially tangential direction; and capable of contacting the mounting surface of the engine body or the bracket and surrounding the bolt through-hole. A mounting surface formed in the housing at a substantially right angle with an axis of the bolt through hole, and each of the bolt through holes is configured to be bolted to the engine body or the bracket. The second bolt through hole has a long hole cross-sectional shape formed in a substantially radial direction of the shaft.

  In addition, the “substantially radial direction of the shaft” in this specification means an angular range of −25 to +25 degrees centering on the radial direction of the shaft. The “minimum diameter first bolt through hole” means that the first bolt through hole is smaller in diameter than the other round hole bolt through holes and the short diameter of the second bolt through hole which is a long hole. And the same diameter or smaller diameter.

  According to this configuration, since the second bolt through hole is a long hole, the misalignment absorbability and alignment workability between the bolt through hole and the female screw hole in the long diameter direction can be improved, and the short The displacement of the posture of the pulley of the vehicular rotating electrical machine in the radial direction can be suppressed, and thereby the early wear of the belt and the increase in friction loss can be suppressed well.

  Further, in this configuration, the minor axis of the long hole is set in the substantially tangential direction of the first bolt through hole, so that the mounting accuracy of the rotating electrical machine for the vehicle can be improved without making the mounting operation difficult. .

  Further explanation will be given.

  When a bolt inserted through the first bolt through hole with the smallest diameter is lightly screwed into the female screw hole on the engine body side, the rotating electrical machine for vehicles has a degree of freedom of rotation around this female screw hole. Since the diameter is set in this rotation direction (substantially tangential direction of the first bolt through hole), the rotating electrical machine for the vehicle rotates and the shaft deviates from the reference direction (axial direction of the crankshaft). Can be suppressed, and belt wear and friction loss can be reduced.

  In addition, since the long diameter of the long hole is formed in the radial direction of the shaft, the second bolt through hole caused by the positional deviation between the two bolt through holes and the positional deviation between the two female screw holes in this direction It is possible to satisfactorily absorb the displacement in this direction with the female screw hole adjacent thereto.

  Normally, the positional deviation between the bolt through hole and the female screw hole does not occur equally in all directions along the mounting surface, but depends on the characteristics of the structure and manufacturing technology, in particular in the specific direction, in particular the vehicular rotating electrical machine. Often occurs in the radial direction of the shaft axis. Therefore, since the long diameter of the long hole is set in the direction in which the positional deviation is large, the mounting accuracy of the rotating electrical machine for the vehicle can be improved without making the mounting work difficult.

  According to the configuration of claim 2, in the rotating electrical machine for a vehicle having the bolt through hole according to claim 1, the major axis of the elongated hole is within a range of −10 to +10 degrees with respect to the radial direction of the shaft. Since it is formed, the mounting accuracy of the rotating electrical machine for the vehicle can be further improved without making the mounting work difficult.

  According to the configuration of claim 3, in the rotating electrical machine for a vehicle having the bolt through hole according to claim 1, further on the opposite side of the second bolt through hole with an axis therebetween, and the first A third bolt through-hole penetrating in the substantially tangential direction in the housing at a position spaced apart from the one bolt through-hole by a predetermined distance in the axial direction. It is characterized in that it is formed larger in diameter than the short diameter of one bolt through hole and the second bolt through hole, so that the fastening strength of the rotating electrical machine for the vehicle is improved without making the installation work difficult. can do.

  According to the configuration of claim 4, in the rotating electrical machine for a vehicle having the bolt through hole according to any one of claims 1 to 3, one of the first and second bolt through holes is a cylinder block, and the other is It is fastened to the cylinder head, and the long diameter of the long hole is set in a direction perpendicular to the joint surface between the cylinder block and the cylinder head.

  As a result, it is possible to satisfactorily absorb the positional variations between the female screw holes that are likely to cause errors in the direction perpendicular to the joint surface.

  According to a fifth aspect of the present invention, there is provided a bolt fastening structure including a pair of bolt through-holes penetrating the member to be fastened at a predetermined distance from each other, and one of the pair of bolt through-holes positioned around the bolt fastening hole. And the both bolt through holes are formed so that the same bolts can be inserted, and either of the bolt through holes is formed with a larger diameter than the other. It is said.

  According to this configuration, since one of the bolt through holes remains small in diameter, it is possible to ensure positioning accuracy and increase the degree of freedom of rocking of the bolt that has passed through the first bolt through hole. Alignment work for searching for the opening of the next bolt through-hole at the tip of the bolt penetrating the one bolt through-hole can be facilitated.

  According to a sixth aspect of the present invention, there is provided a bolt fastening structure including a pair of bolt through-holes penetrating the member to be fastened with a predetermined distance from each other, and one of the pair of bolt through-holes positioned around the pair of bolt through-holes. The bolt through holes are formed so that the same bolt can be inserted, and one end side opening of the bolt through hole is formed larger in diameter than the other end side opening. It is characterized by.

  According to this configuration, the position of the bolt through hole after the bolt is fastened to the female screw hole can be satisfactorily positioned by the inner peripheral surface of the bolt through hole in the vicinity of the other end opening having a small diameter. Further, since the degree of freedom of swinging of the bolts inserted into the bolt through holes can be increased, the bolt insertion work between the pair of bolt through holes inserted by the same bolt or the tip of the bolt passing through the pair of bolt through holes As a result, the work of searching for the opening of the female screw hole can be facilitated.

  In this configuration, the bolt through-hole having one of the both end openings having a large diameter may be provided in either or both of the bolt through-holes through which the same bolt is inserted. Further, the large opening of the bolt through hole may be provided in either direction.

  The inner peripheral surface of the bolt through-holes having different diameters at both end openings may be a tapered surface, or may be composed of two cylindrical surfaces having different diameters across a step.

  Hereinafter, an embodiment of a vehicular AC generator as a vehicular rotating electrical machine to which a bolt fastening structure of the present invention is applied will be described with reference to the drawings.

  FIG. 1 shows a side view of the vehicle alternator, and FIG. 2 is a front view showing a state in which the vehicle alternator is attached to the engine body. However, in order to facilitate understanding, the attachment stay 8 shown in FIG. 1 and the bolts to be attached to the attachment stay are omitted in FIG.

  In this vehicle alternator, 1 is a housing, 2 is a shaft, 3 is a first bolt through hole, 4 is a second bolt through hole, 5 is a third bolt through hole, and 6 is a first mounting stay. , 7 is a second mounting stay, 8 is a third mounting stay, 9 is a bolt guide protrusion, 10 is a bolt, 11 is a pulley fixed to the shaft 2, and is driven by a crankshaft by a belt (not shown). ing.

  100 is a cylinder block, 101 is a cylinder head, and 102 is a gasket. The cylinder head 101 is fastened to the upper end surface of the cylinder block 100 via a gasket 102. The cylinder block 1000 is provided with a mounting projection 1000 protruding rightward, and the tip surface of the mounting projection 1000 is a flat mounting surface (joint surface) 1001 extending in the vertical direction. A mounting protrusion 1010 is provided on the cylinder head 101 so as to protrude rightward, and the tip end surface of the mounting protrusion 1001 is a flat mounting surface (joining surface) 1011 extending in the vertical direction. In the embodiment, both attachment surfaces (joint surfaces) 1001 and 1011 are formed on the same virtual plane.

  The first mounting stay 6 projects below the housing 1, the second mounting stay 7 and the third mounting stay 8 project above the housing 1, and the second mounting stay 7 is on the pulley side. The third mounting stay 8 is disposed on the rear side. The engine-side end surface of the first mounting stay 6 is a flat mounting surface (joint surface) 61 and is in contact with the mounting surface (joint surface) 1001 of the cylinder block 100. The engine-side end surface of the second mounting stay 7 is a flat mounting surface (joint surface) 71 and is in contact with the mounting surface (joint surface) 1011 of the cylinder head 101. The engine-side end surface of the third mounting stay 8 is a flat mounting surface (joint surface) 71 and is in contact with a mounting surface (joint surface) (not shown) of the cylinder head 101, but is not shown. .

  The first mounting stay 6 has a pair of cylindrical portions 62 and 63 that protrude downward from the housing 1 and are separated by a predetermined distance in the left-right direction. The cylindrical portions 62 and 63 are connected by a connecting portion 64. Yes. A bolt through hole 31 is provided in the cylindrical portion 62, and a bolt through hole 32 is provided in the cylindrical portion 63 so as to be aligned in the tangential direction and horizontally with the shaft 2. The bolt through holes 31 and 32 constitute the bolt through hole 3 shown in FIG.

  The second mounting stay 7 has a pair of cylindrical portions 72 and 73 that protrude upward from the housing 1 and are separated by a predetermined distance in the left-right direction. The cylindrical portions 72 and 73 are connected by a connecting portion 74. Yes. Bolt through-holes 41 are provided in the cylindrical portion 72, and bolt through-holes 42 are provided in the cylindrical portion 73 so as to be aligned with each other in the tangential direction of the shaft 2 and horizontally. The bolt through holes 41 and 42 constitute the bolt through hole 4 shown in FIG.

  The third mounting stay 8 (not shown in FIG. 2) has the same shape as the second mounting stay 7 and has a pair of cylindrical portions that protrude upward from the housing 1 and are separated by a predetermined distance in the left-right direction. And both cylinder parts are connected by the connection part. The bolt through-holes provided in both the cylinder portions are provided in the tangential direction and horizontally of the shaft 2 so as to coincide with the axis, and constitute the bolt through-hole 4 shown in FIG.

  The first bolt through-hole 3, that is, the bolt through-holes 31 and 32 are elongated holes as shown in FIG. 1, and the major axis is set in the vertical direction. The minor axis is set to be slightly larger than the outer diameter of the bolt 10, and the major axis is set to be much larger than the minor axis.

  As shown in FIG. 1, the second bolt through-hole 4, that is, the bolt through-holes 41 and 42 are round holes, and the diameter is set to be slightly larger than the outer diameter of the bolt 10. The inner diameter of 42 is set smaller than the shorter diameter of the first bolt through hole and the inner diameter of the third bolt through hole 5.

  Bolts 10 are respectively inserted into the bolt through holes 3 to 5, and these bolts 10 are individually screwed into female screw holes (not shown) formed in a total of three mounting surfaces 1001 and 1011. The AC generator housing 1 is side-mounted on the engine body.

  The connecting portion 64 of the mounting stay 6 is provided with a bolt guide protrusion 9 positioned between the two cylindrical portions 62 and 63, and the connecting portion 74 of the mounting stay 7 is positioned between the two cylindrical portions 72 and 73. Thus, a bolt guide protrusion 9 is provided. These bolt guide protrusions 9 are formed of narrow wall portions that protrude from the connecting portions 64 and 74 toward the bolt 10.

  The inner peripheral surfaces of the bolt through holes 31 and 32 are continuous with the top surface of the bolt guide protrusion 9. The distance from the axial center of the bolt through holes 31 and 32 to this top surface is set equal to the diameter (here, the long diameter) of the bolt through holes 31 and 32. As a result, the bolt 10 that has passed through the bolt through hole 31 is guided by the bolt guide protrusion 9 and guided to the opening on the entrance side of the next bolt through hole 32. The bolt 10 can be inserted very easily. In this embodiment, the bolt through hole 10 is provided on the long diameter side of the bolt through hole 3 which is a long hole, but may be provided on the short diameter side.

  The inner peripheral surfaces of the bolt through holes 41 and 42 are connected to the top surface of the bolt guide protrusion 9. The distance from the axis of the bolt through holes 41 and 42 to the top surface is set equal to the diameter of the bolt through holes 41 and 42. As a result, the bolt 10 that has passed through the bolt through hole 41 is guided by the bolt guide protrusion 9 and guided to the opening on the entrance side of the next bolt through hole 42. The bolt 10 can be inserted very easily. The circumferential width of the bolt guide protrusion 9 is provided around the axis of the bolt through hole in an angular range of about 1 to 45 degrees, preferably 5 to 25 degrees, preferably 10 to 20 degrees. Is preferred. The top surface of the bolt guide protrusion 9 and the inner peripheral surface of the bolt through hole do not need to be continuous, and the bolt guide protrusion 9 may be divided into a plurality of parts in the bolt insertion direction. However, the top surface of the bolt guide protrusion 9 is lowered as it approaches the bolt through hole at the end on the side where the tip of the bolt 10 abuts, and the bolt 10 is lowered at this portion. It is preferable not to hit the door.

  The procedure for assembling the vehicle alternator will be described below.

  First, the bolt 10 is inserted into the second bolt through hole 4 and lightly screwed into a female screw hole (not shown), and then the bolt 10 is inserted into the first bolt through hole 3 and lightly female screw hole ( The bolt 10 is finally inserted into the third bolt through hole 5 and lightly screwed into the female screw hole (not shown).

  In this way, as described above, the mounting operation can be greatly simplified as compared with the conventional one while ensuring the accuracy.

  Another embodiment will be described below with reference to FIG.

  This embodiment is characterized in that the shape of the second mounting stay 7 of the first embodiment shown in FIG. 1 is changed to the mounting stay 7a shown in FIG.

  The mounting stay 7a has a pair of cylindrical portions 720 and 730 that protrude upward from the housing 1 and are separated from each other by a predetermined distance in the left-right direction. The cylindrical portions 720 and 730 are connected by a connecting portion 740 having a partially cylindrical shape. ing. A bolt through hole 410 is provided in the tube portion 720, and a bolt through hole 420 is provided in the tube portion 730 so as to be axially aligned and tangential to the shaft 2 and horizontally.

  The bolt through holes 410 and 42 forming the second bolt through hole 4 are tapered round holes, that is, conical holes, as shown in FIG. More specifically, the inlet opening 4101 of the bolt through hole 410 is formed with a larger diameter than the outlet opening 4102, and the inlet opening 4201 of the bolt through hole 420 is formed with a smaller diameter than the outlet opening 4202. Moreover, the inlet opening 4101 of the bolt through hole 410 is formed with a smaller diameter than the inlet opening 4201 of the bolt through hole 420, and the outlet opening 4102 of the bolt through hole 410 is smaller in diameter than the outlet opening 4202 of the bolt through hole 420. Is formed. Of course, the smallest diameter outlet opening 4102 is slightly larger in diameter than the outer diameter of the bolt 10. Therefore, the top surface 900 of the bolt guiding protrusion 90 extending from the outlet opening 4102 to the inlet opening 4201 is slightly inclined.

  In this way, the following effects can be achieved.

  First, since the inlet opening 4101 of the bolt through hole 410 is formed to have a diameter larger than that of the outlet opening 4102, the bolt 10 can be easily inserted into the bolt through hole 410. Further, since the inlet opening 4201 of the bolt through hole 420 is larger in diameter than the outlet opening 4102 of the bolt through hole 410, the bolt 10 can be easily inserted into the bolt through hole 420. Further, since the outlet opening 4202 of the bolt through hole 420 is formed to have a larger diameter than the inlet opening 4201, the tip of the bolt 10 can be easily aligned with a female screw hole (not shown) by swinging the tip of the bolt 10. Further, when the mounting stay 7a is manufactured by aluminum die casting, the bolt through holes 410 and 420 are tapered holes, so that the forming pins arranged at the positions of the bolt through holes 410 and 420 can be easily removed. Further, the tightened bolt 10 positions the small-diameter hole in the vicinity of the outlet opening of the bolt through hole 410 and defines the position of the mounting stay 7a. Therefore, it is possible to prevent a decrease in mounting accuracy.

(Modification 1)
In the above embodiment, the bolt through-hole 410 is formed with a diameter smaller than that of the bolt through-hole 420, but it may be reversed.

(Modification 2)
In the above embodiment, the vehicle alternator is directly attached to the engine body, but it may be attached via a bracket. In this case, the bracket may be a single member, or may be a plurality of members attached to the engine body (including the cylinder block and the cylinder head). When the bracket is constituted by a plurality of members, it is preferable that each bracket has a joint surface that abuts each other in the vertical direction. In this case, similarly to the vertical joining of the cylinder block 100 and the cylinder head 101 of the first embodiment, the vertical displacement of the upper and lower brackets can be absorbed by the elongated bolt-shaped through hole 3.

It is a side view which shows one Example of the alternating current generator for vehicles of this invention. It is a front view of the alternating current generator for vehicles of FIG. It is sectional drawing which shows the attachment stay of Example 2. FIG.

Explanation of symbols

1 Housing 2 Shaft 3 Bolt Through Hole (Elongated Second Bolt Through Hole)
4 Bolt through hole (minimum diameter first bolt through hole)
5 Bolt through hole (third bolt through hole)
10 volts

Claims (5)

A housing;
A first bolt through hole (4) having a minimum diameter that is provided in the housing in a substantially tangential direction of the shaft;
A second bolt through hole (3) located on the opposite side of the first bolt through hole across the shaft center of the shaft and penetrating through the housing in the substantially tangential direction;
An attachment surface formed on the housing at a substantially right angle with an axis of the bolt through-hole that can contact the attachment surface of the engine body or the bracket and surround the bolt through-hole;
Each of the bolt through holes in the rotating electrical machine for a vehicle formed so as to be bolted to the engine body or the bracket,
The second bolt through hole has a long hole cross-sectional shape in which a long diameter is formed in a substantially radial direction of the shaft,
One of the first and second bolt through holes is fastened to the cylinder block and the other is fastened to a cylinder head provided on the cylinder block via a gasket .
The long diameter of the elongated hole is set in a direction perpendicular to the joint surface between the cylinder block and the cylinder head ,
The diameter of the first bolt through hole is set smaller than the short diameter of the second bolt through hole; and
The housing is penetrated in the substantially tangential direction to the housing at a position opposite to the second bolt through hole with an axial center and at a predetermined axial distance from the first bolt through hole. A third bolt through hole,
The vehicular rotating electrical machine having a bolt through hole, wherein the third bolt through hole is formed larger in diameter than the short diameter of the first bolt through hole and the second bolt through hole. . The rotating electrical machine for a vehicle having the bolt through hole according to claim 1,
The long diameter of the long hole is a rotating electrical machine for a vehicle having a bolt through hole formed within a range of −10 to +10 degrees with respect to the radial direction of the shaft. The rotating electrical machine for a vehicle having the bolt through hole according to claim 1,
One of the first and second bolt through holes is fastened to the engine body through a pair of different brackets,
A vehicular rotating electrical machine having a bolt through hole in which a major axis of the elongated hole is set in a direction perpendicular to a joint surface between the brackets. The rotating electrical machine for a vehicle having the bolt through hole according to claim 1,
The second bolt through hole is formed in the fastened member by being positioned around one of the pair of bolt through holes penetrating the fastened member at a predetermined distance from each other and the pair of bolt through holes. And both the bolt through holes are formed so that the same bolts can be inserted therethrough,
One of the bolt through-holes is a vehicular rotating electrical machine having a bolt through-hole formed larger in diameter than the other. The rotating electrical machine for a vehicle having the bolt through hole according to claim 1,
The second bolt through hole is formed in the fastened member by being positioned around one of the pair of bolt through holes penetrating the fastened member at a predetermined distance from each other and the pair of bolt through holes. A bolt fastening structure in which both bolt through holes are formed so that the same bolts can be inserted therethrough,
One end side opening of the said bolt through-hole is a rotary electric machine for vehicles which is formed larger diameter than the other end side opening, and has a bolt through-hole.

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