JPH10339331A - Installing device for power transmitting wheel of rotary shaft in internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of fallout of a key and looseness at the time of transmission of rotation without increasing work costs by forming engaging grooves deeply closer to fitting-in holes, forming those bottom surface slantly, and arranging the key so as to fit to the engaging groove in both power transmitting wheels. SOLUTION: Engaging grooves 13, 14 are formed deeply closer to fitting-in holes 7c, 9c, bottom surfaces 13a, 14a extending to radial direction in the engaging grooves 13, 14 are inclined for an angle θ from an axis in an installing shaft part 4. A key 15 is installed on a part extended over both sides of a sprocket 7 and a boss part 9 in a pulley 8, and is engaged with A key groove 16 slit on the shaft part 4. The key 15 is engaged with the engaging groove 13 in the sprocket 7 and the engaging groove 14 in the boss part 9 of the pulley 8. It is thus possible to surely obstruct the key 15 from falling out from the key groove 16 by inclined bottom surfaces 13a, 14a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission wheel such as a pulley or a sprocket for a timing belt for a camshaft or a chain for an internal combustion engine with respect to a rotary shaft such as a crankshaft or a camshaft thereof. Two of
The present invention relates to a device for fixing and mounting so as to rotate integrally with a rotation shaft.

[0002]

2. Description of the Related Art Conventionally, at one end of a crankshaft of an internal combustion engine, a first power transmission wheel such as a timing pulley or a timing sprocket for transmitting power to a camshaft, and a power transmission for an engine accessory such as an alternator. When a second power transmission wheel such as a pulley is fixedly mounted so as to rotate integrally with the crankshaft, a mounting shaft is provided at one end of the crankshaft. Two power transmission wheels are arranged side by side and fitted, and the two power transmission wheels are attached to the mounting shaft portion by individual keys provided for each of the two power transmission wheels in the mounting shaft portion, or by the mounting shaft portion. A common key provided so as to be common to both power transmission wheels is configured to be fixed so as to rotate integrally with the crankshaft (for example, FIG. 1 of Japanese Utility Model Application Laid-Open No. 62-167961). See etc. .

[0003]

However, in each of the conventional mounting devices, a narrow-width engaging groove is formed on the inner surface of the insertion hole of the two power transmission wheels to the mounting shaft. A configuration in which the groove is engraved so as to extend in the axial direction, and the individual or common key provided on the mounting shaft portion is fitted into this engagement groove so as to be fixed so as to rotate integrally with the crankshaft. Therefore, the two power transmission wheels have the advantage that the key inside thereof can be assembled without falling off simply by fitting the two power transmission wheels onto the mounting shaft portion of the crankshaft. An engagement groove into which the key of the mounting shaft portion is fitted must be engraved on the inner surface of the insertion hole into the mounting shaft portion of both power transmission wheels so as to extend over the entire length in the axial direction. Processing cost required for engraving But there is a problem that the variable become increase.

By the way, with the above construction, the assembling is performed by first fitting a key into a mounting shaft portion of a crankshaft, and then mounting one of the two power transmission wheels to the mounting shaft. After the key is fitted to the shaft portion so that the key fits into the engagement groove inside the one power transmission wheel, the shaft is moved axially to a predetermined position on the mounting shaft portion, and the two power transmission wheels are After the other power transmission wheel is fitted to the mounting shaft portion so that the key fits into the engagement groove inside the other power transmission wheel, the other power transmission wheel is axially moved to a predetermined position in the mounting shaft portion. Must be done by moving to
In order to improve the work efficiency of this assembly, the two power transmission wheels are fitted to the mounting shaft so that the key provided on the mounting shaft is fitted into the internal engaging groove, and It is necessary that both power transmission wheels be configured to be easily moved to a predetermined position in the axial direction along the mounting shaft with the key fitted in the engagement groove.

However, as described above, the two power transmission wheels are fitted to the mounting shaft so that the key provided on the mounting shaft is fitted into the internal engagement groove, and In order to make it possible to easily move the transmission wheel to a predetermined position in the axial direction along the mounting shaft with the key fitted in the engagement groove, a key provided on the mounting shaft is required. It is necessary to increase the clearance between the power transmission wheel and the engagement groove on both power transmission wheel side in which it fits, but if this clearance is increased, the rotation transmission between both power transmission wheel and the crankshaft will be loose. This causes not only increased vibration and noise, but also reduced durability.

If the clearance is reduced or eliminated in order to solve the problem caused by the backlash, a key is fitted into the engaging groove of the two power transmission wheels with respect to the mounting shaft. Since it becomes difficult to move in the axial direction after being completely fitted, there has been a problem that the workability of assembly is reduced. An object of the present invention is to provide a mounting device which solves these problems at once.

[0007]

In order to achieve this technical object, the present invention provides a first aspect of the present invention, wherein a mounting shaft portion integrally provided at one end of a rotary shaft such as a crankshaft in an internal combustion engine is provided. In a mounting device in which two power transmission wheels are arranged side by side and fitted, in each of the left and right side surfaces of the two power transmission wheels facing each other, a fitting insertion hole of the two power transmission wheels into the mounting shaft portion. An engagement groove extending in the radial direction from the bottom surface is formed by inclining the bottom surface so that the depth in the engagement groove gradually becomes deeper as approaching the insertion hole. A key is provided in a portion straddling the transmission wheel so that the key fits into the engagement groove in both power transmission wheels. "

[0008] In the present invention, "claim 2"
"In a mounting device in which two power transmission wheels are arranged side by side on an attachment shaft portion integrally provided at one end of a rotary shaft such as a crankshaft in an internal combustion engine, the two On each of the side surfaces facing each other, an engagement groove is engraved so as to extend in a radial direction from a fitting hole of the both power transmission wheels into the mounting shaft portion, and the two power transmission wheels of the mounting shaft portion are formed. A key is provided on a portion straddling the wheel so that the key fits into an engagement groove in both power transmission wheels. Further, the rotation shaft is provided in a portion between the two power transmission wheels in the mounting shaft portion. Is fitted with a signal rotor plate for displaying the rotation phase. "

[0009]

As described above, the engaging grooves are provided on the respective left and right side faces of the two power transmission wheels fitted to the mounting shafts, respectively, on the side faces facing each other. While engraving so as to extend in the radial direction from the insertion hole into the shaft portion, a key is provided on a portion of the mounting shaft portion that straddles the two power transmission wheels, and the key is engaged with the two power transmission wheels. By being provided so as to fit into the groove, in assembling, first, one of the two power transmission wheels is moved to a predetermined position after being fitted to the mounting shaft portion, and then A key is mounted on a portion of the mounting shaft portion that straddles both power transmission wheels so that the key fits into an engagement groove in the one power transmission wheel, and Connect the other power transmission wheel to the mounting shaft. Then, by moving to a predetermined position and fitting the key into the engaging groove, both power transmission wheels can be fixed to the mounting shaft portion of the rotating shaft so as to rotate integrally with the rotating shaft, Conventionally, both power transmission wheels are fitted to the mounting shaft portion so that the key provided on the mounting shaft portion fits into the internal engaging groove, and
The two power transmission wheels are simply moved to the mounting shaft without the need to move the two power transmission wheels to a predetermined position in the axial direction along the mounting shaft with the key fitted in the engagement groove. After fitting and moving to a predetermined position, it is only necessary to fit the keys on the mounting shaft side into the respective engaging grooves,
The clearance between the engagement groove on both power transmission wheels and the key on the mounting shaft can be made incomparably smaller than in the conventional case.

Further, the engagement grooves in the two power transmission wheels are formed in the side surfaces thereof, so that the engagement grooves extend in the axial direction inside the two power transmission wheels as in the conventional case. Since engraving can be performed more easily than in the case of engraving as described above, the processing cost can be reduced. Further, as described in the above “Claim 1”, the engagement groove in which the key in the mounting shaft portion is fitted is provided on each of the side surfaces of both power transmission wheels, and the depth of the engagement groove is provided in the fitting insertion hole. By inclining the bottom surface so that it gradually becomes deeper as approaching, it is ensured that the key provided on the mounting shaft portion comes off, at the inclined bottom surface in the engagement groove of both power transmission wheels. Can be blocked.

Still further, as described in the above "Claim 2", a signal rotor plate for displaying the rotational phase of the rotary shaft is fitted to a portion between the two power transmission wheels of the mounting shaft portion. Accordingly, it is possible to reliably prevent the key provided on the mounting shaft from coming off using the signal rotor plate mounted on the rotating shaft in order to detect the rotation phase of the rotating shaft.

Therefore, according to the present invention, when the two power transmission wheels are fixed to the mounting shaft of the rotating shaft so as to rotate integrally with the rotating shaft using a key, the workability of the assembly is improved. In addition, there is an effect that the cost can be greatly improved in a state where the processing cost is not increased and the key is not dropped and the rotation is not rattled.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings when two power transmission wheels are mounted on a crankshaft in an internal combustion engine. 1 to 7
1 shows a first embodiment. In this figure, reference numeral 1 denotes a crankshaft which is supported by a bearing portion 3 of a cylinder block 2. At one end of the crankshaft 1, a mounting shaft portion 4 is mounted on a side of the cylinder block 2. It is provided integrally so as to penetrate the bar 5 and protrude outside.

A sprocket 7 around which a timing chain 6 for transmitting rotation to a camshaft (not shown) is fitted onto a portion of the mounting shaft portion 4 inside the timing chain 5, and a sprocket 7 is further fitted. A boss 9 of a pulley 8 for transmitting rotation to an engine accessory such as a cooling water pump or an alternator is fitted on the mounting shaft 4, and the sprocket 7 and the boss 9 of the pulley 8 are attached to the mounting shaft 4. Bolt 10 inserted and screwed into shaft portion 4 from one end surface thereof
As a result, the sprocket 7 is tightened in the axial direction toward the step surface 11 of the crankshaft 1.

An oil seal 12 for preventing the lubricating oil in the timing chain case 5 from leaking out is provided in a portion of the timing chain 5 through which the boss 9 of the pulley 8 penetrates. Is provided. The side surface 7a of the pulley 8 on the boss 9 side of the left and right side surfaces 7a and 7b of the sprocket 7, and the side surface 9a and 9b of the boss portion 9 of the pulley 8 on the sprocket 7 side. Each of the engagement grooves 13, 14 is formed in each of the engagement grooves 13, 14 such that each of the engagement grooves 13, 14 extends in the radial direction from the engagement hole 7 c, 9 c for the sprocket 7 and the mounting shaft 4 in the boss 9. Set up.

In this case, each of the engagement grooves 13, 1
By making the depth at 4 gradually deeper as it approaches the insertion holes 7c, 9c, the bottom surfaces 13a, 14a of the two engagement grooves 13, 14 extending in the radial direction are formed.
Is inclined at an appropriate angle θ with respect to the axis of the mounting shaft portion 4. Further, the key 1 is attached to a portion of the mounting shaft portion 4 of the crankshaft 1 that straddles both the sprocket 7 and the boss portion 9 of the pulley 8.
5 is provided so that a part of the key 15 is fitted into a key groove 16 formed in the mounting shaft portion 4.
The engagement groove 13 of the sprocket 7 and the engagement groove 14 of the boss 9 of the pulley 8 are fitted.

In this configuration, when assembling,
First, after the sprocket 7 is fitted to the mounting shaft 4, the sprocket 7 is moved to a predetermined position where the sprocket 7 comes into contact with the step surface 11.
After fitting the key 15 so that the key 15 fits into the engagement groove 13 in the sprocket 7, and after the boss 9 of the pulley 8 is fitted to the mounting shaft 4, The sprocket 7 and the pulley 8 are moved with respect to the mounting shaft portion 4 of the crankshaft 1 by moving to a predetermined position where the sprocket 7 comes into contact with the sprocket 7 and fitting the key 15 into the engagement groove 14.
It can be fixed so as to rotate integrally with the crankshaft 1.

Therefore, the sprocket 7 and the pulley 8
Are simply fitted on the mounting shaft 4 and moved to a predetermined position, and then engaged with the engagement grooves 13 and 14 in each of them.
It is only necessary to fit the key on the mounting shaft portion 4 side into the sprocket 7. And the pulley 8 can be made smaller without increasing the difficulty of being fitted on the mounting shaft 4 and moving along the mounting shaft 4, while the sprocket 7 is made smaller.
And the bottom surface 13 of the engagement grooves 13 and 14 in the pulley 8.
Since the a and 14a are inclined surfaces as described above, the inclined bottom surfaces 13a and 14a are in a state of covering both ends of the key 15 in the mounting shaft 4, so that the key 15 is The falling off from the key groove 16 can be reliably prevented by the inclined bottom surfaces 13a and 14a.

The bottom surface 1 of the engagement grooves 13 and 14
3a and 14a have a radius R as shown by a two-dot chain line in FIG.
May be formed on an arcuate inclined surface of a cutting tool, whereby a cutting tool or a grinding tool that rotates both engagement grooves 13 and 14 may be used.
It can be processed at lower cost. 8 and 9
Shows a second embodiment.

In the second embodiment, a signal rotor plate 17 provided with a notch or a hole indicating a phase position in each cylinder is mounted on a crankshaft 1 or a camshaft of an internal combustion engine. Paying attention to the fact that the plate 17 detects the ignition timing or the number of revolutions in each cylinder, the signal rotor plate 17 is connected to the crankshaft 1
Are used for attaching the sprocket 7 and the pulley 8 to the attachment shaft portion 4 in FIG.

That is, the signal rotor plate 17 is
The signal rotor plate 1 is attached to a portion of the mounting shaft 4 between the sprocket 7 and the boss 9 of the pulley 8.
Key 7 in the mounting shaft 4 in the engagement groove 17a in FIG.
5 is fitted so that the sprocket 7
And a boss 9 of the pulley 8.

With this configuration, the signal rotor plate 1
7 can be fixed to the crankshaft 1 so as to rotate integrally therewith, while the signal rotor plate 1
At 7, the key 15 on the mounting shaft 4 is
6 can be reliably prevented from falling off. In the second embodiment as well, it goes without saying that the bottom surfaces 13a and 14a of the engagement grooves 13 and 14 may be formed as inclined surfaces.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

FIG. 4 is a diagram showing an exploded state of FIG. 1;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 4;

FIG. 8 is a longitudinal sectional front view showing a second embodiment of the present invention.

FIG. 9 is a sectional view taken along line IX-IX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crankshaft 2 Cylinder block 3 Bearing part 4 Mounting shaft part 5 Timing chain case 7 Sprocket 8 Pulley 9 Pulley boss part 10 Bolt 13, 14 Engagement groove 13a, 14a Bottom of engagement groove 15 Key 16 Key groove 17 Signal rotor Board

Claims (2)

[Claims] 1. A mounting device in which two power transmission wheels are arranged and fitted to a mounting shaft portion integrally provided at one end of a rotary shaft such as a crankshaft in an internal combustion engine, wherein the left and right power transmission wheels On each of the side surfaces facing each other out of the two side surfaces, an engagement groove extending in a radial direction from the insertion hole to the mounting shaft portion of the two power transmission wheels, the depth of the engagement groove is set to the insertion hole. While the bottom is inclined and engraved so that it gradually becomes deeper as it approaches, the part of the mounting shaft that straddles the two power transmission wheels,
An installation device for a power transmission wheel to a rotating shaft of an internal combustion engine, wherein the key is provided so that the key is fitted into an engagement groove in both power transmission wheels. 2. A mounting device comprising two power transmission wheels arranged side by side and fitted on a mounting shaft part integrally provided at one end of a rotary shaft such as a crankshaft in an internal combustion engine. Engaging grooves are engraved on each of the side surfaces facing each other out of both side surfaces so as to extend in a radial direction from the insertion holes of the two power transmission wheels into the mounting shaft portions. A key is provided at a portion straddling the two power transmission wheels so that the key fits into an engagement groove of the two power transmission wheels, and further, at a portion between the two power transmission wheels of the mounting shaft portion. A signal rotor plate for displaying a rotation phase of the rotating shaft, the power transmitting wheel being attached to the rotating shaft of the internal combustion engine.