JP3205309B2 - Shaft drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft driving device used for transmitting a rotational driving force (hereinafter, also referred to as a rotational force) to a camshaft or a rear wheel in an engine of a motorcycle or a four-wheeled vehicle. About.

[0002]

2. Description of the Related Art A shaft drive of this type does not need to be adjusted for elongation like a chain or a belt, and is free from oil contamination, as compared with a torque transmission device using a chain or a belt.
In recent years, because of its high drive efficiency, long-term stable transmission of torque, long durability, and low transmission noise, it has recently been used to transmit engine rotational drive to the rear wheels and camshaft. Being used to do so. By the way, in a shaft drive device, since rotational force is normally transmitted through bevel gears meshing with each other, if the clearance of the meshing portion (between teeth) of the bevel gears is inappropriate, noise (tooth contact noise) is generated. It is necessary to adjust the clearance because there is a risk of emission or wear in a short time. As shown in an exploded perspective view of FIG. 7, a conventional shaft driving device includes bevel gears 50 and 51 at both upper and lower ends, bearings 52 and 57 supporting a drive shaft 60, gaskets 53 and 54, clamps 55 and 56, and the like. Since a large number of shims 61 and 62 are interposed therebetween, the clearance of the meshing portion between the bevel gear 72 on the camshaft 71 and the bevel gear 50 at the upper end can be adjusted by increasing the number of shims 61 to be interposed or This is done by reducing the number of shims 61 to be interposed. Adjustment of the clearance between the bevel gear 51 and the bevel gear 73 meshing with the lower end bevel gear 51 is performed by increasing or decreasing the number of shims 62. Further, the bevel gear 73 is supported by the drive shaft 74 or an end of a crankshaft (not shown) so as to be integrally rotatable.
Numerals 63 to 65 also show shims, but these shims are for adjusting the clearance for holding the bearing.

The prior art relating to the shaft driving device is disclosed in Japanese Utility Model Laid-Open No. 63-182201 and Japanese Utility Model Laid-Open No.
There is an apparatus described in JP-A-142394. The former is a device for driving a camshaft, and has a structure in which a dynamic damper is attached to a rod-shaped intermediate gear. The latter is a device for driving rear wheels of a motorcycle, and has a structure in which a propeller shaft connected to a shaft of a rear wheel is connected to a second drive shaft of an engine by spline fitting. In addition, the applicant of the present invention can easily and continuously adjust the clearance between the meshing portions of bevel gears such as camshafts with a shaft drive device by an external operation even during operation of the engine (see FIG. 8). And applied for a patent (Japanese Patent Application No. 9-3214).
No. 33).

[0004]

However, there is room for improvement in the following points in the conventional shaft drive device and the shaft drive device of the prior application. That is, not only the conventional device but also the device of the prior application, FIG.
As shown in the figure, the bevel gear 81 has a drive shaft (crank shaft).
82 is attached to the end. A stopper 84 is provided on the crankshaft 82 to prevent reciprocal movement (vibration) along the axial direction. However, since the crankshaft 82 rotates, the stopper 84 and a thrust receiver provided on the crankcase 80 are provided. Since the surface 83 cannot be completely brought into contact and there is a gap between the two, the crankshaft vibrates in the axial direction during operation of the engine. For this reason, the bevel gear 81 attached to the crankshaft 82 also
2, the meshing state with the bevel gear on the drive shaft side changes, and there is a possibility that a tooth contact noise is generated between the bevel gears.

In the device of the prior application, since the bevel gear 81 is attached to the crankshaft 82 as shown in FIG. 8, a tooth contact between a pair of bevel gears 81 and 87 meshed with each other on the crankshaft 82 side. Adjustment of the crankshaft 82
It is necessary to make adjustments while the device is mounted on the crankcase 80, making adjustments difficult and time-consuming.
As shown in FIG. 8, regarding the bevel gear 81 on the crankshaft 82 side, a thin plate-shaped shim 86 is attached to the bevel gear 81.
And between the crankshaft 82 end face
Since the gear contact with the bevel gear 87 is adjusted, it is necessary to disassemble the device prior to the adjustment work, which requires time and labor for the adjustment work including disassembly. is there.

Further, in the conventional apparatus, as shown in FIG. 7, a thin plate-shaped shim 62 is interposed between a bevel gear on the drive shaft side and a holding member thereof, so that the shim 62 is connected to the bevel gear on the crankshaft side. Since the contact of teeth is adjusted, the adjustment work is troublesome, such as the necessity of disassembling the device, the adjustment is difficult, and the work requires skill.

[0007] Since the adjustment work by the shims 61 and 62 (FIG. 7) cannot be performed while the engine is operating, there is a possibility that a slight gap may occur in the clearance between the adjustment (stopping the engine) and the operation. For this reason, even if the clearance appears to be appropriate at the time of adjustment, when the engine is operated, a tooth contact noise may be generated between the bevel gears.
The present invention has been made in view of the above points, and is not affected by the vibration of the drive shaft (crankshaft) during operation of the engine, that is, the drive shaft (crankshaft) vibrates along the axial direction. Also, the tooth contact between the bevel gears does not change, and the tooth contact between the pair of bevel gears on the drive shaft (crankshaft) side can be adjusted in a state separated from the crankshaft, making adjustment easy and accurate. It is an object to provide a shaft drive.

Further, in the shaft drive device, there is provided a shaft drive device in which the clearance between the meshing portions of the bevel gears on the drive shaft side can be easily and continuously adjusted by an external operation even during operation of the engine. Is also aimed at.

[0009]

In order to achieve the above-mentioned object, a shaft driving apparatus according to the present invention uses a pair of bevel gears 34, 16, a drive shaft 5, and a pair of bevel gears 6, 24 to rotate a drive shaft 3. In the shaft drive device 1 having a structure for transmitting the rotation to the rotation driven shaft 2 via the boss portions 6a and 16a of the bevel gears 6 and 16 located at both ends of the drive shaft 5, respectively, are extended in the base axial direction,
Each end of the drive shaft 5 is connected to a bevel gear 6
16 is connected slidably in the axial direction to the base-side extending portion 16 via splines 6c and 16c or key engagement, and one end of the drive shaft 5 is connected to one of the base ends of the bevel gears 6 and 16. One end of the drive shaft 5 can be inserted into the boss portion of the bevel gear beyond the spline or key engagement portion of the side extension portion, and the bevel gear 6
The gear case 15 is detachably attached to a housing 45 that supports the drive shaft 3, and the bevel gear 34 is attached to the gear case 15. Is rotatably supported toward the end of the drive shaft 3 via a bearing 34A, and a spline is provided on an inner peripheral surface of a boss portion of the bevel gear 34, and a spline is provided on an outer peripheral surface of an end of the drive shaft 3; The drive shaft 3 is slidably connected to the bevel gear 34 in the axial direction by meshing the splines.

The driving shaft 3 is a shaft for generating a driving force.
Usually, it is rotatably supported via a bearing. However, since there is a clearance between the drive shaft 3 and the thrust receiving surface, the drive shaft 3 may vibrate in the axial direction (shaft runout).
However, even in such a case, according to the shaft drive device of the present invention having the above-described configuration, the bevel gear 34 of the drive shaft 3 is rotatably supported by the gear case 15 via the bearing 34A. Since it is only connected to the bevel gear 34 via the spline, the reciprocating motion of the drive shaft 3 is absorbed by the spline and is not transmitted to the bevel gear 34. Therefore, the tooth contact does not change after the tooth contact between the bevel gear 34 and the opposing bevel gear 16 is adjusted. In addition, when the gear case 15 is removed from the housing 45 that supports the drive shaft 3, the bevel gear 34 can be pulled out of the drive shaft 3 by eliminating the meshing state with the spline.

As described in claim 2, a cylindrical bearing housing 17 is rotatably mounted around a base end side extension of the bevel gear 16 via a bearing 18, and an outer periphery of the bearing housing 17 is provided. It is more preferable that a screw portion is formed on the surface, a screw hole portion 36 communicating with the inside of the gear case 15 is provided, and a screw portion of the bearing housing 17 is screwed into the screw hole portion 36. According to the device of the second aspect, the bevel gear 16 meshed with the bevel gear 34 is rotatably supported via a bearing on the common gear case 15 with the bevel gear 34, so that the gear case 15 is connected to the housing 45. With removed from
The tooth contact between the bevel gear 16 and the bevel gear 34 can be easily and accurately adjusted. In particular, the bevel gear 16 moves closer to and away from the bevel gear 34 by rotating the bearing housing 17 with respect to the screw hole 36. Therefore, the adjustment operation is easily performed continuously.

Preferably, the spline of the bevel gear 34 and the spline of the drive shaft 3 are involute splines. According to the device having this configuration, there is a degree of freedom in the thrust direction (axial direction), and the axial movement of the drive shaft 3 with respect to the bevel gear 34 is smoothly and sufficiently permitted.

Preferably, the splines 5a and 5b at both ends of the drive shaft 5 are spherical splines. With this configuration, the position and orientation of (the spline 6c of) the bevel gear 6 on the rotation driven shaft 2 side and the (the spline 16 of the bevel gear 16 on the drive shaft 3 side)
Even when the position and the direction of c) do not match due to a machining error, an assembly error, or the like, the meshing portion between the spherical splines 5a and 5b at the upper and lower ends of the drive shaft 5 and the splines 6c and 16c of the bevel gear 6 and the bevel gear 16 are used. , And each bevel gear 6 and 16 is
-It is meshed with 34 in an optimal state.

According to a fifth aspect of the present invention, the rotary driven shaft 2 can be a camshaft and the drive shaft 3 can be a crankshaft. In the device according to this configuration, since the transmitted torque is relatively small, the overall structure can be simplified and the weight and size can be reduced.

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shaft driving device according to the present invention will be described below with reference to the drawings. 1 shows an embodiment of a shaft drive device applied to camshaft drive. FIG. 1 is a partial longitudinal sectional view of an engine, FIGS. 2 and 3 are partially enlarged sectional views of FIG. 1, and FIG. It is a longitudinal section showing the state where a camshaft system and a crankshaft system were separated. FIG. 5 is a partial plan view of the engine of FIG. 1 with the head cover removed, and FIG. 6 is a sectional view taken along the line III-III of FIG.

As shown in FIGS. 1 to 4, the engine A is an air-cooled single overhead cam (SO
HC) 4-valve horizontal engine. The shaft driving device 1 is interposed between the crankshaft 3 in the crankcase 45 at the lower part of the engine A and the camshaft 2 above the cylinder head 44 at the upper part.

The shaft driving device 1 includes a drive shaft 5 having spherical splines 5a and 5b formed at both upper and lower ends.
, An upper bevel gear 6 and a lower bevel gear 16. The upper bevel gear 6 is a spiral bevel gear (helical bevel gear), and as shown in FIG.
Are extended axially downward (proximal end side), and a large number of vertically linear splines 6c that engage with the spherical splines 5a are provided on the lower inner peripheral surface of the cylindrical proximal extension portion 6b. It is protruding. The spline 6c of the cylindrical extension 6b of the bevel gear 6 is attached to the spherical spline 5a of the drive shaft 5.
Are slidably engaged in the axial (up and down) direction. With this configuration, the bevel gear 6 is mounted on the drive shaft 5 so as to be slidable in the axial direction and swingable in all directions within a predetermined angle. A cylindrical metal bearing housing 7 is rotatably mounted around the cylindrical extension 6b of the bevel gear 6. A pair of upper and lower bearings 8 is fitted in the bearing housing 7, and the inner ring side of the bearing 8 is fitted into the outer peripheral surface of the cylindrical extension 6b. Cylindrical extension 6b
A threaded portion 6d is formed on the outer peripheral surface of the lower end of the cylindrical member.
The bearing housing 7 is sandwiched between the upper end stepped portion b and the bearing housing 7 and is rotatably mounted around the base-side extending portion 6 b of the bevel gear 6. An outer surface of a lower portion 10a of a metal cylindrical case 10 having upper and lower ends opened is formed in a hexagonal shape, and a male screw portion 10b is formed on an outer peripheral surface of an upper portion of the cylindrical case 10 so that the inside of a lower end portion of the bearing housing 7 is formed. It is screwed into the female screw portion 7c around and is connected integrally with the bearing housing 7. An inward flange (stopper ring) 10d protrudes from the inner peripheral surface of the cylindrical case 10 at an intermediate position in the vertical direction to restrict the upward movement amount of the sleeve cover 21 described later within a predetermined range. ing. On the outer peripheral surface of the bearing housing 7, a male screw portion 7a is formed except for an upper portion.

The lower bevel gear 16 meshed with the spherical spline 5b at the lower end of the drive shaft 5 also has the same structure and the same dimensions as the upper bevel gear 6. Therefore, the description is omitted, and the common members are denoted by reference numerals obtained by adding 10 to the reference numerals of the members of the upper bevel gear 6, and FIGS.
Shown in Note that reference numerals 6e and 16e are space portions.

Around the drive shaft 5, there is arranged a cylindrical sleeve guide 11 made of metal, whose outer diameter is substantially the same as the threaded portions 6d and 16d of the bevel gears 6 and 16 and whose inner diameter is slightly larger than the bulging portions 5c and 5d. Is equipped. The overall length of the cylindrical sleeve guide 11 is approximately half the length of the drive shaft 5, and an outward ring-shaped flange 5 e protrudes from the outer peripheral surface of the drive shaft 5 below the spherical spline 5 a. An annular groove 5f is formed near the upper end of the bulging portion 5c.

As shown in FIG. 1, the upper and lower spherical splines 5a and 5b of the drive shaft 5 are
The sleeve guide 11 is placed on the cylindrical extension 16b of the lower bevel gear 16 in a state where the upper bevel gear 6 and the lower bevel gear 16 are connected to each other while being meshed with the lower bevel gear 6c. In this state, the coil-shaped compression spring 12 is compressed and interposed between the ring-shaped flange 5e of the drive shaft 5 and the lower end of the cylindrical extension 6b of the upper bevel gear 6, and the drive shaft 5 is moved downward. When energized, the annular groove 5
f, the snap ring 13 is fitted to the sleeve guide 11
And the sleeve guide 11 is also urged downward. As a result, the drive shaft 5 is held at a fixed position.

As shown in FIG. 3, the lower case 20 is provided with a cylindrical extension 20c extending further upward from the hexagonal lower portion 10a of the upper case 10, and the upper end (base end) of the extension 20c. The portion 20d has an outer peripheral surface formed in a tapered shape. In addition, the outer peripheral surface of the intermediate portion 20a of the lower case 20 is formed in a hexagonal shape, the male screw portion 20b is formed on the lower external peripheral surface of the lower case 20, and the female screw portion 17c on the inner periphery of the upper end of the lower housing 17 is formed. It is screwed and tightened to be integrally connected to the housing 17.

A substantially cylindrical sleeve cover 21 made of metal for connecting the upper and lower cases 10 and 20 can be inserted into the lower case 20 as shown in FIG. 4, and has an upper end 21a and a lower end 21b.
Is formed so as to gradually increase in thickness toward the upper end or the lower end, and annular grooves 21 are formed on the outer peripheral surfaces of the upper end 21a and the lower end 21b.
c · 21d are formed in two stages, upper and lower. O-rings (not shown) loaded in the respective annular grooves 21c and 21d
Through the inner peripheral surface of the upper case 10 and the lower case 2
0 is connected so as to be able to rotate relative to the inner peripheral surface. As shown in FIG. 3 or FIG. 4, an annular groove 21e is formed slightly above the two-step annular groove 21d on the outer peripheral surface of the lower portion of the sleeve cover 21, and the snap ring 14 is fitted in the annular groove 21e. The snap ring 14 is locked at the upper end opening end of the lower case 20, and the sleeve cover 21 is held at a fixed position.

The camshaft 2 is rotatably disposed via a bearing 23 in a camshaft chamber 44A formed above the cylinder head 44 as shown in FIG. 1 or FIG. A spiral bevel gear 24 corresponding to the bevel gear 6 is attached to one end (the right end in the drawing) of the same by a set screw 25 so as to be integrally rotatable.

On the other hand, as shown in FIG. 3, one side wall 45a of the crankcase 45 is formed in a flat surface, and one end (right end in the figure) of the crankshaft 3 projects outward from an opening 45b provided in the side wall 45a. I have. The gear case 15 for covering the projection 3a of the crankshaft 3 is
5 is detachably attached to one side wall 45a via a fixing bolt (not shown).

On one side (right side) of the engine A,
As shown in FIG. 2, a communication hole 26 communicating with the inside is formed on the lower surface of the cylinder head 44, and a female screw portion 26a is formed on the inner peripheral surface of the communication hole 26, so that a so-called screw hole is formed. The female screw portion 26a has an upper end portion 26b in the communication hole 26.
And an annular groove 26c for loading an O-ring (not shown) is formed in the upper end portion 26b. Further, as shown in FIG. 3, a communication hole 3 communicating with the inside of the gear case 15 directly below the gear case 15 corresponding to the screw hole 26 is formed.
6 are formed on the inner peripheral surface of the communication hole 36.
a is formed, and the screw hole is formed like the communication hole 26. The female screw portion 36a is a lower portion 36b in the screw hole portion 36.
And an annular groove 36c for loading an O-ring (not shown) is formed at an end of the lower portion 36b.

As shown in FIG. 3, a recess 15b is formed on the inner wall of the gear case 15 for fitting an annular bearing 34A, and the spiral bevel gear is inserted through the bearing 34A fitted in the recess 15b. 34 is rotatable set screw 34
b. Boss part 34 of bevel gear 34
c, an involute tooth spline 34 d is formed on the inner peripheral surface of the crankshaft 3. The involute tooth spline 35 meshing with the spline 34 d
a is formed on the outer peripheral surface. 3, the involute spline 34d of the bevel gear 34 is engaged with the involute spline 35 of the crankshaft 3 in a state where the gear case 15 is attached to the side wall 45a of the crankcase 45 as shown in FIG. A stopper ring 34e that engages with the bearing 34A is attached to one end surface of the boss 34c of the bevel gear 34 with a set screw 34f.

To adjust the contact of the bevel gear 34 with the bevel gear 16 on the drive shaft 5 side, a shim 15c is interposed between the bottom surface in the recess 15b and the bearing 34A, and the head of the set screw 34b is It is performed by interposing the spacer 15d between the bearing 34A and the thickness of the shim 15c and the spacer 15d. Also,
The adjustment is performed by moving the lower bevel gear 16 closer to or away from the bevel gear 34. As described later, the lower case 20 is connected to the housing 17
It is performed by rotating together with one of the right and left.

As shown in FIG. 2, the upper housing 7 is screwed into the screw hole 26 of the cylinder head 44, and the lower housing 17 is screwed into the screw hole 36 of the gear case 15. In this state, the teeth of the upper bevel gear 6 of the drive shaft 5 mesh with the teeth of the bevel gear 24 of the camshaft 2, and the teeth of the lower bevel gear 16 mesh with the teeth of the bevel gear 34 of the crankshaft 3. A locking nut 28 is screwed to the lower end of the male screw 7a of the upper housing 7. The nut 28 is integrally provided with a small-diameter cylindrical portion 28a at the upper end. An annular hole 26d corresponding to the small-diameter cylindrical portion 28a is formed in the inner peripheral surface of the opening of the screw hole 26, and the nut 28 is tightened. The small-diameter cylindrical portion 28a has the annular hole 2
6d, and the upper surface of the nut 28 is
Is in contact with the lower surface of the cylinder head 44 in the vicinity of. Further, in this example, a screw hole 7b penetrating laterally is formed in the lower end of the cylinder head 44 , and the tip of a set screw 29 screwed into the screw hole 7b is brought into contact with the small-diameter cylindrical portion 28a of the nut 28. This prevents the nut 28 from loosening.

A locking nut 38 is also screwed on the upper end of the male screw portion 17a of the lower housing 17, as shown in FIG.
a, the small-diameter cylindrical portion 38a fits into the annular hole portion 36d in a state where the nut 38 is tightened, and the nut 3
8 is in contact with the upper surface of the gear case 15 around the screw hole 36.

As shown in FIG. 3 , a piston 42 (see FIG . 3 ) is provided in a cylinder liner 41A of the cylinder block 41 .
6) is slidably inserted in the vertical direction, and the piston 42 is connected to the crankshaft 3 via the connecting rod 43. The cylinder head 44 is provided with two intake ports 44a (FIG. 6) and two exhaust ports 44b. As shown in FIGS. 5 and 6, an intake valve 44c is provided at each intake port 44a, and an exhaust valve 44e is provided at each exhaust port 44b so as to be vertically movable, and is an independent type for opening and closing the exhaust valve 44e. The rocker arms 44f and 44f are operated by the rocker shaft 46 to open and close the intake valve 44c.
, Each of which is pivotally supported. 6, an ignition portion 49a of the ignition plug 49 is disposed substantially at the center of the combustion chamber 30 along a guide pipe 48 whose upper end is inclined toward the exhaust port 44b.

Next, in the shaft driving device 1 according to the present embodiment having the above-described configuration, when adjusting the contact between the bevel gear 16 and the bevel gear 34 on the crankshaft 3 side, the drive shaft 5 and the like are separated from the camshaft 2 side. The procedure of the work and the adjustment work will be described.

In FIG. 1, when the engine A is stopped, the annular groove 21 on the lower outer peripheral surface of the sleeve cover 21 is formed.
e, the snap ring 14 fitted inside is removed, and the sleeve cover 21 is inserted into the lower case 20 on the lower bearing housing 17 (see FIG. 4).

In the above state, the snap ring 13 is removed from the upper annular groove 5f of the drive shaft 5.

Under the weight of the drive shaft 5 and the urging force of the compression spring 12, the upper spherical spline 5 a of the drive shaft 5 slips downward from the spline 6 c of the cylindrical extension 6 b of the upper bevel gear 6, and
The lower spherical spline 5b of the drive shaft 5 is connected to the spline 16c of the cylindrical extension 16b of the lower bevel gear 16.
And is inserted downward into the space 16e. As a result, as shown in FIG. 4, the driving power system on the crankshaft 3 side is separated from the driven power system on the camshaft 2 side. FIG.
In the state (1), the fixing bolt (not shown) is loosened and the gear case 15 is pulled rightward with respect to the side wall 45a (FIG. 3) of the crankcase 45, so that the bevel gear 34
Of the involute spline 34d of the crankshaft 3 comes out of the involute spline 35, so that the gear case 15 can be removed with the bevel gears 16, 34 and the like assembled.

The set screw 34b is loosened and the spacer 15d
, The bevel gear 34 is pulled out of the recess 15b together with the bearing 34A, and the shim 15c is replaced with a shim having a different thickness. Then, by returning to the original state, the mounting position of the bevel gear 34 is adjusted. Also, bevel gear 1
The bevel gear 16 approaches or separates from the bevel gear 34 by rotating the bearing housing 17 of No. 6 right or left in the screw hole 36, and adjustment is performed.
The components on the crankshaft 3 side, such as the bearing 34A, can be easily and quickly replaced in the same procedure.

After adjustment of the tooth contact or replacement of parts, the spline 34 d of the bevel gear 34 supported by the gear case 15 is pushed into the spline 35 of the crankshaft 3 along the axial direction, and a fixing bolt (not shown) is tightened. The gear case 15 is connected to the side wall 45 a of the crankcase 45.
, The above operation is completed (see FIG. 3). Next will be described a procedure of adjusting the clearance of the meshing portion between the upper bevel gear 6 and base Berugiya 24 for shaft drive device 1.

In FIG. 1 or FIG. 2, when the engine 1 is operating or stopped, first, the set screw 29 is loosened to make the nut 28 rotatable, and then the nut 28 is loosened using a tool such as a spanner.

The tool is fitted into the hexagonal lower part 10 a of the cylindrical case 10 and slowly rotated rightward or leftward. When the case 10 is rotated in the right direction, the upper housing 7 rises while rotating in the screw hole portion 26, so that the teeth of the bevel gear 6 and the bevel gear 2 of the cam shaft 2
The clearance between the teeth of No. 4 became narrow, and conversely, Case 1
When 0 is rotated to the left, the clearance between the teeth of the bevel gear 6 and the teeth of the bevel gear 24 of the camshaft 2 increases. By rotating the case 10 via the tool in this way, the clearance with the bevel gear 24 can be continuously adjusted, and the rotation of the cover 10 is stopped in an optimal state.

After the nut 28 is tightened using a tool, the set screw 29 is tightened to complete the adjustment work.

Accordingly, the above operations can be performed in a very short time using a simple tool without disassembling the shaft driving device 1 from outside the engine A. Further, also for the lower bevel gear 16, the clearance of the meshing portion with the bevel gear 34 can be adjusted in the same procedure as described above.

Further, according to the shaft drive device 1 of the above embodiment, as shown in FIG. 1, the position and orientation of the screw hole 26 provided on the lower surface of the cylinder head 44 on one side (right side) of the engine A. Even if the position and orientation (usually vertical) of the screw hole 36 provided on the upper surface of the housing cover 15 and the orientation (usually vertical) do not match due to machining errors and assembly errors, the upper and lower ends of the drive shaft 5 a spherical spline 5a-5b of being absorbed by the meshing portion of the spline 6c-16c of the upper bevel gear 6 and the lower bevel gear 16, the upper and lower bevel gear 6, 16 are meshed with the optimum conditions to the bevel gear 24, 34 of the other party You.

Although one embodiment for driving a camshaft has been described above, the shaft driving device of the present invention is not limited to the driving of the camshaft 2 as in the above-described embodiment, but also drives the rear wheels of a motorcycle. Also apply for. In this case, since the transmitted rotational driving force is large, the outer diameter of the drive shaft, bevel gear, etc. is enlarged to increase the strength, and the drive shaft is divided at an intermediate position in the longitudinal direction, and a universal joint is provided. Since other structures are common, illustration is omitted.

In the above-described embodiment, the spherical splines 5a and 5b are interposed at the connection between the upper and lower ends of the drive shaft 5 and the bevel gears 6 and 16. However, a linear spline structure may be used. An engagement structure between a key and a key groove may be used. In short, the bevel gears 6 and 16 may be connected to the upper and lower ends of the drive shaft 5 slidably in the axial direction, respectively.

Further, the structure of the lower case 20 is applied to the upper case 10, the drive shaft 5 is turned upside down, and the compression spring 12 is connected to the cylindrical extension 16 b of the lower bevel gear 16 (see FIG. 3). ) , The drive shaft 5 is interposed between the upper end and the lower ring-shaped flange (see 5e in FIG. 2), and the drive shaft 5 is rotated upward together with the cylindrical sleeve guide 11 mounted around the drive shaft 5 to rotate the crank shaft 3. To the camshaft 2, insert the sleeve cover 21 into the upper case 10, and insert the upper end side spherical spline 5 a of the drive shaft 5 into the space 6 e of the upper bevel gear 6 to separate it from the crankshaft 3 system. You can also make it.

Furthermore, the present invention is not limited to the case where the rotation driven shaft 2 and the drive shaft 3 are arranged vertically, but may be arranged left and right,
The same applies to the case where the drive shaft 5 and the sleeve cover 21 are arranged in a horizontal posture.
A snap ring 14 may be attached to one side and an inward flange may be protruded in the other bearing housing or the inner peripheral surface of the cylindrical case. Snap ring 14 in the annular groove of
Can be fitted to hold the sleeve cover 21 in place.

In addition, it is possible to form the cylindrical cases 10 and 20 integrally with the bearing housings 7 and 17 by extending the base ends of the bearing housings 7 and 17 further toward the base end. In addition, the claims
Although not described, the invention of claim 1 or claim 2 described above
And by adding another component,
An effect is produced. A) The rotation of the drive shaft 3 is controlled by a pair of bevel gears 16, 34,
Drive shaft 5, via a pair of bevel gears 24 and 6
Shaft drive device 1 having a structure for transmitting rotation to the driven shaft 2
The bevels located at both ends of the drive shaft 5
The bosses 6a and 16a of the lug gears 6 and 16 at the base end, respectively.
Extend in the axial direction and remove the end of the drive shaft 5
Each of the bevel gears 6 and 16 has a
Shafts via plunges 6c and 16c or key engagement
Slidably connected to the drive shaft
5, one end of the bevel gears 6 and 16 is provided on one base end side.
Over the spline or key engagement part of the bevel gear
The drive shaft 5
An outwardly projecting ring-shaped flange protrudes near one end of the outer peripheral surface
And from the flange on the outer peripheral surface of the drive shaft 5
An annular groove is formed near the middle position in the longitudinal direction,
Between the bevel gear and the proximal open end of one bevel gear.
Retract the ring and attach the drive shaft 5 to the other bevel
Gear, and open the other end of the bevel gear at the proximal end.
Cylindrical filer mounted around drive shaft 5 at the mouth end
End of the sleeve guide 11, and the sleeve guide 11
The other end of the snap ring (circle)
Lip) 13 and the base end of each bevel gear 6.16
Around the extension, cylindrical bearings are inserted via bearings 8 and 18.
The housings 7 and 17 are rotatably mounted, and the bearing
To form a thread on the outer peripheral surface of the housing 7
A housing for rotatably supporting the rotary driven shaft 2
A screw hole 26 communicating with the inside of the
Gear case 1 for housing 45 that supports drive shaft 3
5 is removably mounted, and the gear case 15
With the bevel gear 34 facing the end of the drive shaft 3
4A, and is rotatably supported through the bevel gear 34.
A spline is provided on the inner peripheral surface of the boss and the drive shaft
3. Splines are provided on the outer peripheral surface of the end of
Drive the bevel gear 34 by engaging the
The shaft 3 is slidably connected in the axial direction.
Are provided with screw holes 36 communicating with the inside.
26.36 screws for the bearing housings 7 and 17
Parts, and each bearing housing 7, 17 is the base end side.
Cylindrical sleeve caps between the inner peripheral surfaces of each base-side extension.
The drive shaft is connected to the bar 21 so as to be relatively rotatable.
5 and the sleeve cover 21
Can be inserted into one of the base end extension portions of the housings 7 and 17
And the outer peripheral surface of the sleeve cover 21 is reduced.
Both have an annular groove on one side and snap ring in the annular groove
(Circlip) 14
Opening of one of the base-side extending portions of the housings 7 and 17
The snap ring 14 is locked to the part and the sleeve cover
Shaft drive device holding 21 in place. The above configuration
According to the shaft drive device having the above-mentioned,
Sleeve cover in addition to the function of claim 2 and the function of claim 2.
21 fitted in at least one annular groove on the outer peripheral surface of
Remove the nap ring (circlip) 14 and
Cover 21 to one of bearing housings 7 and 17
With the driveshaft inserted into the base extension,
Remove the snap ring (circlip) 13 of the shaft 5
With the biasing force of the compression spring 12,
The spline or the spline at one of the base gear side extension portions of the bell gears 6 and 16
Pulls out one end of the drive shaft 5 from the key engagement part
And the other end of the drive shaft 5 is connected to the bevel gears 6.16.
Through the spline or key engaging part of the other
And insert it into the boss of the bevel gear. This result
As a result, the rotation driven shaft 2 side and the drive shaft 3 side are separated.
Drive without disassembling the parts on the rotation driven shaft 2 side
Remove the gear case 15 from the shaft 3 side housing 45
The parts on the drive shaft 3 side can be exchanged easily and in a short time.
There is an effect that can be replaced. B) The rotation of the drive shaft 3 is controlled by a pair of bevel gears 16, 34,
Drive shaft 5, via a pair of bevel gears 24 and 6
Shaft drive device 1 having a structure for transmitting rotation to the driven shaft 2
The bevels located at both ends of the drive shaft 5
The bosses 6a and 16a of the lug gears 6 and 16 at the base end, respectively.
Extend in the axial direction and remove the end of the drive shaft 5
Each of the bevel gears 6 and 16 has a
Shafts via plunges 6c and 16c or key engagement
Slidably connected to the drive shaft
5, one end of the bevel gears 6 and 16 is provided on one base end side.
Bevel gear boss beyond the spline or key engagement part of
The drive shaft 5
Provide an outwardly facing ring-shaped flange near one end of the
A longitudinal direction from the flange on the outer peripheral surface of the drive shaft 5
An annular groove is formed near the intermediate position of
Compression spring between the proximal open end of the bevel gear
12 and the drive shaft 5 is connected to the other bevel gear.
, And the opening on the proximal side of the other bevel gear.
Cylindrical three covered at the end around drive shaft 5
Abut one end of the guide 11 and
At the other end, a snap ring (circular
13) and the base end of each bevel gear 6, 16 is extended.
Cylindrical bearings around bearings via bearings 8 and 18
The housings 7 and 17 are rotatably mounted, and the bearings
A thread is formed on the outer peripheral surface of the housings 7 and 17.
And a housing for rotatably supporting the rotation driven shaft 2.
44, a screw hole 26 communicating with the inside is provided.
The gear case 15 is mounted on the housing 45 for supporting the driving shaft 3.
To the gear case 15
With the bevel gear 34 facing the drive shaft 3 end, the bearing 34
A, and is rotatably supported through the
A spline is provided on the inner peripheral surface of the drive shaft and the drive shaft 3
Splines are provided on the outer peripheral surface of the
Are engaged with the bevel gear 34 to drive the drive shaft.
3 so as to be slidable in the axial direction.
On the other hand, a screw hole 36 communicating with the inside is provided.
6.36 screw section of the bearing housing 7.17
, And rotate integrally with each bearing housing 7, 17.
Connect the cylindrical cases 10 and 20 as much as possible
A cylindrical sleeve cap is provided between the inner peripheral surfaces on the proximal side of the cases 10 and 20.
The drive shaft is connected by a bar 21 so as to be relatively rotatable.
While covering the shaft 5, the sleeve cover 21 is
Formed in one of the cases 10 and 20 and
An annular groove is provided on at least one side of the outer peripheral surface of the cover 21.
And insert a snap ring (circlip) 14 into the annular groove.
By fitting, one case and of the case 10, 20
Lock the snap ring 14 against the opening
Hold the sleeve cover 21 in place, and
The ring housings 7 and 17 are mounted on the rotary driven shaft 2 side housing.
For the gearing 44 or the gear case 15 on the drive shaft 3 side
By rotating, bevels on both ends of drive shaft 5
Clearance of meshing parts of gears 6 and 16 can be adjusted respectively
A shaft drive device that has been configured to work. A system having the above configuration
According to the shaft drive device, the drive shaft 3
After separating the side, the drive shaft 3 side housing 45
By removing the case 15 and replacing each part on the drive shaft 3 side
Function and the effect and claim of claim 1 described above.
In addition to the function of claim 2, the following functions are provided:
I can. That is, the bevel gears at both ends of the drive shaft
When it is necessary to adjust the clearance of the meshing part of
By rotating each bearing housing in one direction
Bevel gear on the drive shaft side with respect to the other bevel gear.
Bell gear moves forward or backward with bearing housing
The rotation direction and rotation of the bearing housing
Engagement of bevel gear at one end of drive shaft depending on angle
The clearance of the part is continuously adjusted. Also drive
The shaft and other driving parts are cylindrical cases and sleeve covers.
It is covered with a bar, and dust etc.
There is no
The bevel gear can be easily turned on even when the engine is running.
There is an effect that the clearance of the meshing portion can be adjusted.
Therefore, the torque is transmitted by a chain or belt.
The cover directly on the engine body
And the arrangement of the equipment can be determined relatively freely.
High degree of freedom in design, allowing design that emphasizes design
It will work. C) Loosen the threaded parts of the bearing housings 7 and 17
The retaining nuts 28 and 38 are screwed into the housing 4
4 or the opening surface of the screw holes 26 and 36 of the gear case 15
So that the nuts 28 and 38 can be abutted and tightened.
Shaft drive. In the device with this configuration,
Other than the above, the locking housing acts as a bearing housing.
The bevel gears are not easily loosened, so the bevel gear mesh
Is maintained in an optimal adjustment state .

[0054]

As is apparent from the above description,
The shaft driving device of the present invention has the following excellent effects.

(1) According to the first aspect of the present invention, even if the drive shaft may reciprocate in the axial direction, the bevel gear of the drive shaft is rotatably supported by the gear case via a bearing, and the drive shaft and the bevel gear are rotatably supported. Is merely connected to the bevel gear via the spline, so that the reciprocating motion of the drive shaft is absorbed by the spline and is not transmitted to the bevel gear. Therefore, the tooth contact does not change during operation, and the bevel gear supported by the gear case is easily pulled out or pushed into the drive shaft along the spline axial direction from the housing supporting the drive shaft. Can be removed.

(2) According to the second aspect of the present invention, the drive shaft side bevel gear meshed with the drive shaft side bevel gear is rotatable via a bearing in a common gear case with the drive shaft side bevel gear. Because it is supported, the gear contact between the bevel gear and the bevel gear can be easily and accurately adjusted with the gear case removed from the housing, and the bevel gear on the drive shaft side has the bearing housing in the screw hole part. On the other hand, the rotation causes the bevel gear on the drive shaft side to approach or separate from the bevel gear, so that the adjustment operation can be performed continuously and easily.

(3) According to the third aspect of the invention, the spline of the bevel gear on the gear case side and the spline on the drive shaft side are formed as involute splines, so that there is a degree of freedom in the thrust direction (axial direction) and the driving force is reduced. The transmission can be performed reliably and smoothly, the movement in the axial direction is smooth, and even if the drive shaft reciprocates (vibrates) in the axial direction, it is absorbed by the spline portion and is not transmitted to the bevel gear .

(4) In the invention according to claim 4, the position and orientation of the bevel gear on the rotation driven shaft side and the position and orientation of the bevel gear on the drive shaft side do not match due to processing errors and assembly errors of the gear case and the like. Also, the bevel gears are absorbed by meshing portions between the spherical splines at the upper and lower ends of the drive shaft and the splines of the bevel gears, and each bevel gear is meshed with the other bevel gear in an optimal state.

(5) According to the fifth aspect of the invention, since the transmitted torque is relatively small, the overall structure is simplified and the weight is reduced.
The size can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of an engine, showing an embodiment of a shaft drive device of the present invention applied to camshaft drive.

FIG. 2 is an enlarged longitudinal sectional view showing a camshaft side portion of FIG. 1;

FIG. 3 is an enlarged longitudinal sectional view showing a portion on a crankshaft side of FIG. 1;

FIG. 4 is a longitudinal sectional view showing a state where a camshaft system and a crankshaft system are separated in the shaft drive device of FIG. 1;

FIG. 5 is a partial plan view of the engine of FIG. 1 with a head cover removed.

FIG. 6 is a sectional view taken along line III-III of FIG. 5;

FIG. 7 is an exploded perspective view showing a conventional general shaft driving device for driving a camshaft.

FIG. 8 is a partial vertical sectional view showing a crankshaft side of a shaft drive device for driving a camshaft according to the prior application.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft drive 2 Camshaft 3 Crankshaft 5 Driveshaft 5a / 5b Spherical spline 6.6 / 16/24/34 Bevel gear 7.17 Bearing housing 8.18 / 34A Bearing 10/20 Cylindrical case 11 Cylindrical sleeve guide 12 Compression Spring 13/14 Snap ring 15 Gear case 6c / 16c / 34d / 35 Spline 21 Sleeve cover 45 Crank case 26/36 Screw hole (communication hole) 28/38 Locking nut A Engine

Continuation of the front page (56) References JP-A-7-198001 (JP, A) JP-A-7-215262 (JP, A) JP-A-8-179784 (JP, A) JP-A-10-311382 (JP) , A) Japanese Utility Model Application 63-141806 (JP, U) Patent 3032196 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16H 1/14, 55/20 F16H 57/02, 57/12 F01L 1/02 F02B 67/04

Claims (5)

(57) [Claims] The rotation of the drive shaft (3) is controlled by a pair of bevel gears.
(34.16), a drive shaft (5), and a shaft drive device (1) configured to transmit the rotation to a rotation driven shaft (2) via a pair of bevel gears (6.24), both ends of the drive shaft (5). Bevel gear located in
The bosses (6a, 16a) of (6, 16) are respectively extended in the proximal axial direction, and the ends of the drive shaft (5) are respectively attached to the proximally extending portions of the bevel gears (6, 16). On the other hand, they are connected slidably in the axial direction via splines (6c, 16c) or key engagement, respectively.
One end of the drive shaft (5) can be inserted into the boss of the bevel gear beyond the spline or key engagement portion of one of the base end extending portions of the bevel gear (6, 16). Can be separated from the spline or key engaging portion of one of the base-end extending portions of the bevel gears (6, 16), and the gear case (15) is mounted on the housing (45) supporting the drive shaft (3). And the bevel gear (34) is attached to the gear case (15) with the drive shaft (3).
It is rotatably supported via a bearing (34A) toward the end, a spline is provided on the inner peripheral surface of the boss portion of the bevel gear (34), and a spline is provided on the outer peripheral surface of the end of the drive shaft (3). By engaging the splines of
A shaft drive device, wherein a drive shaft (3) is slidably connected in an axial direction to a bevel gear (34). 2. A cylindrical bearing housing (17) is rotatably mounted via a bearing (18) around a base-side extension of said bevel gear (16).
A screw portion is formed on the outer peripheral surface of the (17), and a screw hole (36) communicating with the inside of the gear case (15) is provided, and the bearing housing (1) is provided in the screw hole (36).
2. The shaft driving device according to claim 1, wherein the threaded portion of (7) is screwed. 3. The shaft drive device according to claim 1, wherein a spline of the bevel gear (34) and a spline of the drive shaft (3) are involute splines. 4. The shaft drive device according to claim 1, wherein the splines (5a, 5b) at both ends of the drive shaft (5) are spherical splines. 5. The rotary driven shaft (2) is a camshaft,
A shaft drive for driving a camshaft according to any of the preceding claims, wherein the drive shaft (3) is a crankshaft.