JPH11153212A - Sheet metal pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low cost sheet metal pulley provided with a rotation stop function without boring a through hole in a pulley main body. SOLUTION: This device is provided with a sheet metal pulley main body 20 comprising a metal plate molded in a specified form, and an auxiliary plate 21 comprising a metal plate and fixed on the pulley main body 20 as overlapped with the pulley main body 20. This sheet metal pulley 10 is fixed to a shaft 11 by a screw member 12 provided at a position at a center part of the pulley main body 20. Tool hooking parts 41 comprising recessed parts, notches, or through holes bored in a circular plate part are formed at plural positions in a circumferential direction of the auxiliary plate 21 at an outer circumferential end part of the auxiliary plate 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet metal pulley mounted on a rotating body such as a shaft in an engine or the like.

[0002]

2. Description of the Related Art An engine such as an internal combustion engine transmits its rotational power to engine accessories and the like by a pulley via a crankshaft. A pulley is mounted on the crankshaft, and power is transmitted to a pulley such as an engine auxiliary machine or a compressor via a belt wound around the pulley to rotate the pulley.

[0003] The pulley is fixed to the crankshaft by a screw member such as a bolt or a nut. This screw member is usually screwed to the crankshaft by a screw member that penetrates from the outside of the pulley at one central portion of the pulley in the axial direction. Therefore, when attaching or removing the pulley, if the screw member is turned by a tool such as a spanner or a wrench, the fastening torque given to the screw member is transmitted to the crankshaft, and the crankshaft rotates around the axis. Sometimes.

For this reason, it is necessary to take some countermeasures against rotation and fasten the screw member with a tool such as a spanner or a wrench. As a countermeasure against rotation, for example, the rotation of the pulley is restricted by strongly pressing the belt wound around the pulley by hand, or FIG.
Non-rotating tool (end yoke holder) 1 as shown in
The screw member 4 is fastened by a tool such as a wrench 3 while the rotation of the pulley 2 is restrained.

In the case of using the rotation preventing tool 1 shown in FIG. 7, it is necessary to form at least a pair of tool hook holes 5 in the pulley 2. This tool hook hole 5 is
Can be formed relatively easily when it is made of casting, but in that case, there is a problem that the manufacturing cost is high. In addition, since the cast pulley is heavy, a sheet metal pulley is desired to reduce the weight.

[0006]

The tool catching hole to be formed in the sheet metal pulley does not take the form of a through hole extending from the front side to the back side of the pulley due to the thickness of the pulley and processing restrictions. Not get. When such a through-hole is formed, when rainwater or car wash water is applied to the pulley, water may enter the back surface of the pulley (engine side) through the through-hole and cause trouble. Conceivable. In addition, since sheet metal pulleys are relatively thin,
It is not preferable in terms of strength to make a hole in the pulley itself or to catch a large torque by hooking a detent tool in this hole. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sheet metal pulley having a rotation preventing function without making a through hole in a pulley body.

[0007]

According to a first aspect of the present invention, there is provided a sheet metal pulley according to the present invention, wherein a central portion of a sheet metal pulley body is screwed with a bolt or nut. In a sheet metal pulley which is fastened to a rotating body such as a shaft by a member, an auxiliary plate made of a metal plate is fixed by appropriate fixing means such as welding or press fitting in a state where the auxiliary plate is overlapped on the fastening screw seat side of the pulley body. The auxiliary plate has a tool hook at at least two places in the circumferential direction. The tool hooking portion may be a notch-shaped recess or notch formed on the outer peripheral portion of the auxiliary plate as described in claim 2,
It may be a through hole as described in claim 3.

When the sheet metal pulley of the present invention is mounted on a rotating body (for example, a crankshaft or the like) to be mounted by a screw member, a fastening tool such as a wrench is fitted to the screw member, and the fastening tool is rotated around the axis. , The screw member is fastened to the rotating body to be mounted. At this time, the pulley is prevented from rotating by locking a rotation preventing tool such as an end yoke holder on the tool hooking portion of the auxiliary plate. When attaching this sheet metal pulley from the rotating body,
The pulley is prevented from rotating by locking the anti-rotation tool on the tool hooking portion of the auxiliary plate, and the screw member is rotated in the loosening direction by the fastening tool and removed from the rotating body.

The concept of a pulley referred to in this specification is used in pulleys (sprockets) for toothed belts used as timing belts and various devices other than engines, in addition to pulleys having V grooves for so-called V-ribbed belts. Various forms of sheet metal pulleys are also included.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a sheet-metal pulley 10 according to the present invention has a shaft 11 such as a crankshaft as an example of a rotating body to be attached.
At one end, one screw member 12 functioning as a fastening screw
Fixed by

An example of the screw member 12 is a bolt. The screw member 12 is screwed into the screw hole 16 of the shaft 11 by a fastening tool 15 such as a box wrench. The screw hole 16 is formed on the central axis of the shaft 11. The fastening tool 15 has a socket 18 that can be fitted to the head 17 of the screw member 12.

The pulley 10 is made of a metal plate formed of a metal plate such as a steel plate and has the following shape. The pulley body 20 is made of a metal plate and is superposed on the fastening screw seat side of the pulley body 20. An auxiliary plate 21 fixed to 20 is provided.

The pulley body 20 has a flat disk portion 26 having a circular center hole 25 at one central portion thereof,
A cylindrical portion 27 connected to the outer periphery of the disk portion 26;
7 has a V-groove component 28 provided on the outer peripheral side.
A not-shown belt (for example, a V-ribbed belt) is wound around a V-groove 29 formed in the V-groove forming section 28.

The center hole 25 passes through the disk 26 in the thickness direction, and the screw member 12 such as a bolt is passed through the center hole 25. When a male screw portion is provided at the center of the end face of the shaft 11 in the axial direction of the shaft 11, this male screw portion is passed through the center hole 25, and a screw member such as a nut is screwed into the male screw portion. Pulley 10 is fixed to shaft 11.

The auxiliary plate 21 has a substantially disk shape and is fixed to the pulley body 20 by welding as an example of a fixing means. A through hole 40 through which the screw member 12 passes is also formed at the center of the auxiliary plate 21.

The outer peripheral portion of the auxiliary plate 21
A tool hooking portion 41 is formed at the location. As shown in FIG. 2 or FIG. 3, the tool hooking portion 41 of this embodiment takes the form of a notch-shaped concave portion or notch formed on the outer peripheral portion of the auxiliary plate 21, and is provided around the end yoke holder and the like. The pair of tip portions 1a and 1b of the stopping tool 1 can be locked to a pair of tool hooking portions 41 corresponding thereto. The plurality of (for example, four) tool hooking portions 41 are provided at equal pitches (for example, 90 degrees each) in the circumferential direction of the auxiliary plate 21.

As shown in FIG. 2, one of the four tool hooking portions 41 receives the knock pin 45 from one of the tool hooking portions 41a. In the case of this embodiment, the knock pin 45 is provided on a sprocket 46 located on the back side of the pulley 10, and the knock pin 4
5 is inserted into a positioning hole 47 formed in the disk portion 26 of the pulley body 20, so that the relative positional relationship between the pulley 10 and the sprocket 46 in the circumferential direction is regulated.

When the sheet metal pulley 10 is mounted on the shaft 11 to be mounted, a socket 18 of a fastening tool 15 such as a wrench is fitted to the head 17 of the screw member 12, and the fastening tool 15 is screwed. By rotating the screw member 12 around the axis of the
6 and tighten. At this time, as shown in FIG. 3, the tip ends 1a and 1b of the detent tool 1 are locked to the pair of tool hooks 41 of the auxiliary plate 21 to prevent the rotation of the pulley 10.

When the sheet metal pulley 10 is attached from the shaft 11, the tip of the rotation preventing tool 1 is locked to the tool hooking portion 41 of the auxiliary plate 21 to stop the rotation of the pulley 10. None, fastening tool 15
The screw member 12 and the pulley 10 are removed from the shaft 11 by rotating the screw member 12 in the loosening direction.

As shown in FIG. 4, the auxiliary plate 21
May be a through hole of the same shape formed in the auxiliary plate 21. Tool hook 4
These through holes functioning as 1
Are provided at the same radius in the circumferential direction at equal pitches or unequal pitches. In short, the number of the tool hooking portions 41 may be at least one pair (two places) in the circumferential direction of the auxiliary plate 21, and is desirably provided at an equal pitch in the circumferential direction in order to balance the weight of the auxiliary plate 21.

FIG. 5 shows a modification of the auxiliary plate 21. The auxiliary plate 21 has a disk-shaped main portion 21a.
And a rim portion 21b connected to the outer periphery of the main portion 21a. In the auxiliary plate 21 having such a rim portion 21b, a recess or notch similar to that of the above-described embodiment is provided.
Alternatively, a plurality of tool hooking portions 41 formed of through holes are formed at equal or unequal pitches in the circumferential direction of the auxiliary plate 21.

The outer diameter of the rim portion 21b is slightly smaller than the inner diameter of the cylindrical portion 27 of the pulley body 20.
The auxiliary plate 21 having such a rim portion 21b is
As shown in FIG. 6, the rim portion 21 b is pressed into the cylindrical portion 27 of the pulley main body 20 in a state where the rim portion 21 b is in close contact with the pulley main body 20, thereby being fixed to the pulley main body 20.

It is needless to say that the present invention can be carried out by appropriately modifying each component such as the pulley main body, the auxiliary plate, and the tool hook portion constituting the present invention. In addition, the present invention is naturally applicable to pulleys (sprockets) for toothed belts used as timing belts and various types of pulleys used for various devices other than engines, in addition to pulleys having V-grooves. .

[0024]

According to the sheet metal pulley of the present invention, the function of preventing the rotation of the pulley can be achieved without making a through hole in the pulley body. Can be reinforced by an auxiliary plate, and can be provided at a lower cost and lighter weight than a cast pulley. In the case of the tool hooking portion formed of the concave portion, the notch, or the through hole described in claim 2 or 3, the processing of the auxiliary plate is easy, and the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a sheet metal pulley according to an embodiment of the present invention is attached to a shaft.

FIG. 2 is a front view of the sheet metal pulley shown in FIG.

FIG. 3 is a perspective view of an auxiliary plate and a rotation preventing tool of the sheet metal pulley shown in FIG. 1;

FIG. 4 is a perspective view showing a modification of the auxiliary plate.

FIG. 5 is a perspective view showing still another modified example of the auxiliary plate.

FIG. 6 is a sectional view showing a state in which the auxiliary plate shown in FIG. 5 is pressed into a pulley main body.

FIG. 7 is a perspective view showing a part of a conventional casting pulley and a tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Detent tool 10 ... Sheet metal pulley 11 ... Shaft (rotary body) 12 ... Screw member 15 ... Fastening tool 20 ... Pulley body 21 ... Auxiliary plate 41 ... Tool hook

Claims (3)

[Claims] 1. A sheet metal pulley having a sheet metal pulley body formed by shaping a metal plate into a predetermined shape and having a central portion of the pulley body fixed to a rotating body to be mounted by a screw member. An auxiliary plate comprising a plate and fixed to the pulley body in a state of being superimposed on the fastening screw seat surface side of the pulley body and having a tool hooking portion capable of locking a detent tool at least at two places in the circumferential direction. A pulley made of sheet metal, characterized in that: 2. The tool hooking portion is a concave portion or notch formed on the outer peripheral portion of the auxiliary plate, and the plurality of concave portions or notches are provided at equal pitches or unequal pitches in the circumferential direction of the auxiliary plate. The sheet metal pulley according to claim 1, wherein: 3. The tool hook portion is a through hole formed in the auxiliary plate, and the plurality of through holes have the same shape and have the same pitch or unevenness in the same radius in the circumferential direction of the auxiliary plate. 2. The device according to claim 1, wherein the components are provided at a pitch.
The sheet metal pulley described.