JPH10169553A - Pulley connecting structure of compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the compressor connection part and the pulley connection part of a connecting member which are separated by breaking from coming into contact with each other. SOLUTION: In this connecting structure, if excessive rotational force is applied between a pulley 2 and the shaft 1a of a compressor 1, respective breakable parts 3c of a connecting plate 3 are broken and the compressor connection part 3a and the respective pulley connection parts 3b of the connecting plate 3 are separated. As a result, the compressor 1 and the pulley 2 are separated from each other, and only the pulley 2 is run in a dry condition, so that an adverse effect upon a power source side is prevented. At that time, the broken part of the respective pulley connection parts 3b is shifted in the circumferential direction of the pulley 2 from the center of its hole, therefore, the respective pulley connection parts 3b are rotated around a pin 4 by means of centrifugal force by the rotation of the pulley 2. The broken part moves to the outside in the diametrical direction of the pulley 2. It is thus possible to prevent the broken part of the respective pulley connection parts 3b from coming into contact with the broken part of the compressor connection part 3a even if the pulley 2 continues to run in a dry condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a compressor used in an air conditioner for a vehicle and a pulley for transmitting power from a power source of the vehicle to the compressor.

[0002]

2. Description of the Related Art Conventionally, as described in, for example, Japanese Utility Model Publication No. 6-39105, a pulley for transmitting power is arranged coaxially with a rotating shaft of a compressor and connected to a rotating shaft of the compressor. The connecting member is placed on one end side of the pulley and a part of the connecting member is connected to the pulley.If an excessive rotational force is applied between the rotary shaft of the compressor and the pulley due to a compressor failure, etc. The connecting member is broken to separate the compressor and the pulley, and only the pulley is idled so that the power source side of the vehicle is not adversely affected.

[0003]

However, according to the conventional structure, when the connecting member is broken, the pulley is rotating even if the compressor is stopped. There is a problem that the side connection portion comes into contact due to the unevenness of the fractured surface or the like, which causes abnormal noise or scattering of fragments.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to prevent a connection portion between a compressor side and a pulley side of a connection member separated by breakage from coming into contact with each other. An object of the present invention is to provide a pulley connection structure of a compressor.

[0005]

To achieve the above object, according to the present invention, a pulley for transmitting power to a compressor is arranged coaxially with a rotary shaft of the compressor.
When the rotating shaft of the compressor and the pulley are connected via a connecting member arranged on one end surface side of the pulley, and a rotating force of a predetermined magnitude or more is applied between the rotating shaft of the compressor and the pulley,
In a pulley connecting structure of a compressor in which a predetermined portion between a pulley-side connecting portion and a compressor-side connecting portion of a connecting member is broken to separate the compressor and the pulley, a pulley-side connecting portion separated by the breakage The pulley-side connecting portion and the pulley are arranged at a position radially outward of the pulley from the compressor-side connecting portion, and at least the broken portion of the pulley-side connecting portion after the break is broken by centrifugal force caused by the rotation of the pulley. They are connected to move outward. Thus, when the pulley-side connecting portion and the compressor-side connecting portion of the connecting member are separated by breaking of a predetermined portion, at least the broken portion of the pulley-side connecting portion moves radially outward of the pulley due to centrifugal force due to rotation of the pulley. Therefore, even if the pulley continues to idle, the pulley-side connecting portion does not contact the compressor-side connecting portion.

According to a second aspect of the present invention, in the pulley connecting structure of the compressor according to the first aspect, a pulley side connecting portion of the connecting member is rotatably connected to a connecting portion provided on the pulley. Accordingly, in addition to the function of the first aspect, the broken portion of the pulley-side connecting portion moves radially outward of the pulley by the rotation of the pulley-side connecting portion.

According to a third aspect of the present invention, in the pulley connecting structure for a compressor according to the first aspect, a pulley side connecting portion of the connecting member is movably connected to a connecting portion provided on the pulley in a predetermined direction. Accordingly, in addition to the operation of the first aspect, the broken portion of the pulley-side connecting portion is moved radially outward of the pulley by the movement of the pulley-side connecting portion in the predetermined direction.

[0008]

1 to 6 show a first embodiment of the present invention. FIG. 1 is a side sectional view of a part of a compressor and a pulley, and FIG. 2 is a front view of a pulley and a connecting plate. FIG. 3 is a front view of a main part of the connecting plate, FIG. 4 is a side sectional view of a main part of the pulley and the connecting plate, FIG. FIG.

The compressor 1 shown in FIG. 1 has a shaft 1a connected to an internal mechanism (not shown). The shaft 1a is rotatably supported by a bearing 1c via a bearing 1b so that one end of the shaft 1a protrudes to the outside. ing. A pulley 2 for power transmission is rotatably supported on the outer periphery of the bearing 1c via a bearing 1d. That is, the pulley 2 is disposed coaxially with the shaft 1 a of the compressor 1. Further, a connecting plate 3 disposed on one end surface side of the pulley 2 is connected to the shaft 1a of the compressor 1, and a pin 4 connected to the connecting plate 3 is connected to one end surface of the pulley 2 in a circumferential direction of the pulley 2. It is provided at equal intervals in a total of three places. That is, the connecting plate 3
Are a compressor-side connecting portion 3a connected to the shaft 1a of the compressor 1, three pulley-side connecting portions 3b connected to the pins 4 of the pulley 2, a compressor-side connecting portion 3a and each pulley-side connecting portion. It comprises a breakable portion 3c provided between the portions 3b, and the breakable portion 3c is formed to be thin so as to break when a rotational force of a predetermined magnitude or more is applied. As shown in FIG. 3, each pulley-side connecting portion 3b has a hole 3d that fits into the pin 4, and the hole 3d opens one end in the circumferential direction of the pulley 2 so that the pin 4 can be press-fitted. Further, each pulley-side connecting portion 3b is formed such that the center of the hole 3d is deviated by a distance L in the circumferential direction of the pulley 2 from a portion connected to the breakable portion 3c, and the thickness of each pulley-side connecting portion 3b is increased. A
Is formed to be smaller than the length B of the fitting portion of the pin 4 as shown in FIG.

In the above configuration, when the pulley 2 is rotated by a power transmission belt (not shown), the rotational force of the pulley 2 is transmitted via the connecting plate 3 to the shaft 1 of the compressor 1.
a, and the compressor 1 rotates. At this time, for example, when the compressor 1 becomes unable to rotate due to a failure or the like and an excessive rotational force is applied between the pulley 2 and the shaft 1a of the compressor 1, each of the connecting plates 3 can be broken as shown in FIG. The portion 3c is broken, and the compressor side connecting portion 3a of the connecting plate 3 and each pulley side connecting portion 3b are separated. As a result, the compressor 1 and the pulley 2 are separated from each other, and only the pulley 2 idles, thereby preventing an adverse effect on the power source side. At this time, since the broken portion 3e of each pulley side connecting portion 3b is deviated in the circumferential direction of the pulley 2 from the center of the hole 3d, each pulley side connecting portion 3b
Is located closer to the broken portion 3e. As a result, each pulley-side connecting portion 3b rotates about the pin 4 by centrifugal force due to the rotation of the pulley 2, and the broken portion 3e moves radially outward of the pulley 2, so that the pulley 2 continues to idle. Also, the broken portion 3e of each pulley side connecting portion 3b does not contact the broken portion 3f of the compressor side connecting portion 3a.

As described above, according to this embodiment, when each breakable portion 3c of the connecting plate 3 is broken and the compressor side connecting portion 3a and each pulley side connecting portion 3b of the connecting plate 3 are separated, Since the broken portion 3e of the pulley-side connecting portion 3b moves radially outward of the pulley 2, even if the pulley 2 continues to idle, the broken portion 3e of each pulley-side connecting portion 3b becomes the same as the compressor-side connecting portion 3a. Without contacting the broken portion 3f, it is possible to reliably prevent generation of abnormal noise and scattering of fragments due to contact between the broken portions 3e and 3f.

The hole 3d of each pulley side connecting portion 3b is open at one end in the circumferential direction of the pulley 2 so that the pin 4 can be pressed into the hole 3d. Therefore, as shown in FIG. By rotating the attached connecting plate 3 in one direction, each pulley-side connecting portion 3b can be easily fitted to the pin 4. In this case, since the thickness of each pulley-side connecting portion 3b is formed smaller than the length of the fitting portion of the pin 4, the pulley 2 and the shaft 1 of the compressor 1 are formed.
a can be tolerated in the axial direction.

In the above-mentioned embodiment, the pulley 2 is provided with a hole 3d which is open at one end in the circumferential direction of the pulley 2 for fitting a pin in each pulley-side connecting portion 3b, but as shown in FIG.
The hole 4g is provided only in the axial direction of
And then fixed to the pulley 2.

8 to 10 show a second embodiment of the present invention. FIG. 8 is a front view of a pulley and a connecting plate, FIG. 9 is a side sectional view of a main part thereof, and FIG. FIG. The same components as those in the above embodiment are denoted by the same reference numerals.

The connecting plate 5 shown in FIG. 1 includes a compressor-side connecting portion 5a connected to the shaft 1a, a total of three pulley-side connecting portions 5b connected to the pulley 2, and a compressor-side connecting portion 5a.
a and a breakable portion 5c provided between each pulley-side connecting portion 5b. The breakable portion 5c is formed to be thin so as to break when a rotational force of a predetermined magnitude or more is applied. Each pulley-side connecting portion 5b has a projection 5d inserted into a hole 2a provided in the pulley 2 as shown in FIG. 9, and after being pressed into the hole 2a of the pulley 2 at the tip of the projection 5d,
A locking piece 5e that locks on the inner surface side of the pulley 2 is provided. Each pulley-side connecting portion 5b is formed such that the center of the protrusion 5d is deviated in the circumferential direction of the pulley 2 from a portion connected to the breakable portion 5c.
A gap of a distance C is formed between b and the pulley 2.

According to the above configuration, when an excessive rotational force is applied between the pulley 2 and the shaft 1a, each breakable portion 5c of the connecting plate 5 is broken as shown in FIG.
The compressor side connecting portion 5a and each pulley side connecting portion 5b are separated. At that time, the broken portion 5f of each pulley side connecting portion 5b
Is displaced in the circumferential direction of the pulley 2 from the center of the protrusion 5d, so that each pulley-side connecting portion 5b rotates around the protrusion 5d by centrifugal force due to the rotation of the pulley 2, and the same as in the previous embodiment. Since the breaking portion 5f moves radially outward of the pulley 2, the breaking portion 5f of each pulley-side connecting portion 5b contacts the breaking portion 5g of the compressor-side connecting portion 5a even if the pulley 2 continues to idle. There is no.

In this embodiment, the connection plate 5 can be easily connected to the pulley 2 by press-fitting each projection 5d of the connection plate 5 into each hole 2a of the pulley 2. Due to the gap between the portion 5b and the pulley 2, axial displacement between the pulley 2 and the shaft 1a can be allowed.

FIGS. 11 to 13 show a third embodiment of the present invention. FIG. 11 is a front view of a pulley and a connecting plate, FIG. 12 is a side sectional view of a main part thereof, and FIG. FIG. The same components as those in the above embodiment are denoted by the same reference numerals.

The connecting plate 6 shown in FIG. 1 includes a compressor-side connecting portion 6a connected to the shaft 1a, three pulley-side connecting portions 6b connected to the pulley 2, and a compressor-side connecting portion 6a.
a and a rupturable portion 6c provided between each pulley-side connecting portion 6b. The rupturable portion 6c is formed so as to be thin so as to break when a rotational force of a predetermined magnitude or more is applied. Each pulley-side connecting portion 6b is inserted into a correspondingly shaped hole 2b provided in the pulley 2 as shown in FIG.
Has a gap of a distance D in the radial direction of the pulley 2 between the pulley 2 and the pulley-side connecting portion 6b. Further, the thickness E of each pulley-side connecting portion 6b is formed smaller than the depth F of the hole 2b.

According to the above configuration, when an excessive rotational force is applied between the pulley 2 and the shaft 1a, each breakable portion 6c of the connecting plate 6 is broken as shown in FIG.
Is separated from the compressor-side connecting portion 6a and the respective pulley-side connecting portions 6b. At this time, each pulley-side connecting portion 6b moves radially outward of the pulley 2 in the hole 2b together with the breaking portion 6e due to centrifugal force due to the rotation of the pulley 2, so that the pulley 2 is idled as in the above-described embodiment. Is continued, the broken portion 6e of each pulley side connecting portion 6b does not contact the broken portion 6f of the compressor side connecting portion 6a.

In this embodiment, as shown in FIG. 12, each pulley-side connecting portion 6b of the connecting plate 6 is inserted into each of the holes 2b of the pulley 2, thereby easily connecting the connecting plate 6 to the pulley 2. Can be done. Further, since the thickness of each pulley side connecting portion 6b is formed smaller than the depth of each hole 2b of the pulley 2, axial displacement between the pulley 2 and the shaft 1a of the compressor 1 can be allowed. .

[0022]

As described above, according to the pulley connecting structure of the compressor according to the first, second and third aspects, the compressor-side connecting portion and the pulley-side connecting portion of the connecting member separated by breaking come into contact with each other. Therefore, generation of abnormal noise due to contact of the broken portion, scattering of fragments, and the like can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a part of a compressor and a pulley showing a first embodiment of the present invention.

FIG. 2 is a front view of a pulley and a connecting plate.

FIG. 3 is a front view of a main part of the connecting plate.

FIG. 4 is a side sectional view of a main part of a pulley and a connecting plate.

FIG. 5 is an explanatory diagram of an operation at the time of breakage.

FIG. 6 is a diagram showing a method of connecting a connecting plate to a pulley.

FIG. 7 is a front view of a main part of a connecting plate showing a modification of the pulley-side connecting part.

FIG. 8 is a front view of a pulley and a connecting plate according to a second embodiment of the present invention.

FIG. 9 is a side sectional view of a main part of a pulley and a connecting plate.

FIG. 10 is an explanatory diagram of an operation at the time of breakage.

FIG. 11 is a front view of a pulley and a connecting plate according to a second embodiment of the present invention.

FIG. 12 is a side sectional view of a main part of a pulley and a connecting plate.

FIG. 13 is an explanatory diagram of an operation at the time of breakage.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Pulley, 3 ... Connecting plate, 3a ... Compressor side connection part, 3b ... Pulley side connection part, 3c ... Breakable part, 5 ... Connection plate, 5a ... Compressor side connection part, 5b ... Pulley-side connecting portion, 5c: breakable portion, 6: connecting plate, 6a: compressor-side connecting portion, 6b: pulley-side connecting portion, 6c: breakable portion.

Claims (3)

[Claims] 1. A pulley for transmitting power to a compressor is disposed coaxially with a rotary shaft of the compressor, and the rotary shaft of the compressor and the pulley are connected via a connecting member disposed on one end surface side of the pulley. When a rotational force of a predetermined magnitude or more is applied between the rotating shaft of the compressor and the pulley, the predetermined portion between the pulley-side connecting portion and the compressor-side connecting portion of the connecting member is broken and compressed. In a pulley connection structure for a compressor configured to separate a compressor and a pulley, a pulley-side connection portion separated by the break is disposed radially outside of the pulley from the compressor-side connection portion, and the pulley-side connection portion and the pulley And a pulley connecting structure of a compressor, wherein at least the broken portion of the pulley-side connecting portion after the break is connected to move radially outward of the pulley by centrifugal force due to rotation of the pulley. . 2. The pulley connection structure for a compressor according to claim 1, wherein a pulley-side connection portion of the connection member is rotatably connected to a connection portion provided on the pulley. 3. The pulley connection structure for a compressor according to claim 1, wherein a pulley-side connection portion of the connection member is movably connected to a connection portion provided on the pulley in a predetermined direction.