JPH11236875A - Clutchless compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost clutchless compressor to relax the fluctuation of load torque, and properly cut off transmission of a overload on the compressor side. SOLUTION: A clutchless compressor transmits the drive force of an engine to a rotary shaft 2 contained in a housing 1 through a pulley 10 rotatably mounted on the housing 1, The clutchless compressor comprises a hub 20 arranged at the end part of a rotary shaft 2 protruding from the housing 1 to the outside; a cover member 21; a rolling ball 40 located in the middle a power transmission path running from the pulley 10 to the hub 20 and reducing the occurrence of a torque fluctuation; and recessed part 11 and 24 formed in the pulley 10 and the cover 21, respectively, and positioned facing each other in the direction of the rotary shaft 2 of the pulley 10. The rolling ball 40 is held in the recessed parts 11 and 24 in a manner to be removable when a load higher than a specified value is exerted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a clutchless compressor.

[0002]

2. Description of the Related Art In a compressor with a clutch, the driving force of an engine is transmitted to a rotating shaft of the compressor via an electromagnetic clutch.

[0003] In this compressor with a clutch, when an abnormality such as seizure occurs inside the compressor, the electromagnetic clutch is disengaged based on the temperature and pressure inside the compressor to prevent engine stall due to excessive load on the engine. doing.

On the other hand, in a clutchless compressor that does not use an electromagnetic clutch, when an abnormality such as seizure occurs in the compressor, the compressor is connected to a pulley by a pulley in order to prevent engine stall due to excessive load on the engine. A mechanism is provided to cut off power transmission to the rotating shaft.

[0005] Japanese Patent Application Laid-Open No. H8-159028 discloses that a rolling ball is sandwiched between a hub fixed to a rotary shaft and a pulley urged toward the hub by a spring together with an angular bearing. There is disclosed a clutchless compressor that releases rolling balls from a recess formed in a pulley when a load torque becomes excessive.

However, this compressor has the following problems.

No torque damping function is provided.

When the load torque of the compressor becomes excessive,
The rolling ball that transmits torque from the pulley to the hub separates from the normal position and the transmission of torque is interrupted, but at this time, the entire pulley moves in the axial direction, so the belt may come off from the pulley. is there. In addition, since the bearing that rotatably supports the pulley must be moved in the axial direction, the bearing cannot be pressed into the housing, and the bearing that receives a large load slides in the axial direction. So noise is more likely to occur,
The life of the bearing will be shortened.

Since the rolling ball is formed of a rigid body,
Loud noise may be generated due to torque fluctuations caused by the compressor or the like.

In this compressor, a bearing is press-fitted into a housing, and a rolling ball is sandwiched between a pulley rotatably provided in the housing via the bearing and a hub fixed to a rotating shaft. When the load torque on the compressor side becomes excessive, the rolling ball is released from the recess, and an annular elastic body is further placed between the pulley and the hub. Japanese Patent Application Laid-Open No. H8-210250 discloses a compressor that is interposed and reduces the fluctuation of the load torque by this elastic body.

[0011]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No. Hei 8-2
The compressor disclosed in Japanese Patent No. 10250 has the following problem.

The rolling ball is pressed against the hub-side recess formed in the hub by a metal spring, and torque is transmitted by the pressing force. If the spring is damaged, the spring and the rolling ball may be scattered.

Although an elastic body is adhered to the pulley side in order to produce a torque damping action, the diameter of the elastic body becomes large mechanically and the cost increases.

Since the mechanism for transmitting torque and the torque damping mechanism are composed of different parts, the number of parts increases and the cost increases.

A technique for transmitting torque and damping torque by using a rolling ball made of an elastic body is also known, but has the following problems.

In order to transmit a large torque or to generate a torque damping action, it is necessary to increase the diameter of the rolling ball. However, due to space restrictions, the diameter of the rolling ball cannot be made too large. .

Further, if the diameter of the rolling ball is increased, it becomes difficult for the rolling ball to separate from the holding portion, and it is difficult to cut off the transmission of power from the pulley to the rotary shaft of the compressor when an excessive load torque is applied. Become.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an inexpensive clutchless compressor that can alleviate fluctuations in load torque and appropriately block transmission of overload on the compressor side. To provide.

[0019]

According to a first aspect of the present invention, an external drive source is connected to a drive shaft housed in a housing via a pulley rotatably mounted on the housing. In a clutchless compressor in which a driving force is transmitted, a driving force transmitting member provided at an end of the driving shaft protruding to the outside from the housing, and a power transmitting path from the pulley to the driving force transmitting member. An elastic member for reducing torque fluctuation, and a concave portion provided on each of the pulley and the driving force transmitting body so as to be able to face each other in the rotation axis direction of the pulley. In addition, when a load torque equal to or more than a predetermined value is applied, the load torque is held so as to be detachable.

The elastic member can mitigate the fluctuation of the load torque on the compressor side, and when the load torque on the compressor side exceeds a predetermined value due to an abnormality inside the compressor, the elastic member separates from the concave portion and the pulley is moved. Idle. Further, torque transmission and torque damping are performed by the elastic member.

According to a second aspect of the present invention, there is provided the clutchless compressor according to the first aspect, wherein the high-rigidity member is housed in the elastic member and has higher rigidity than the elastic member, and is formed in the elastic member. And a space into which the high-rigidity body enters when a load torque greater than or equal to the predetermined value acts.

When an excessive load is applied, the highly rigid body enters the space of the elastic member, and the space in which the highly rigid body is housed is crushed by the load, and the elastic member is deformed.

According to a third aspect of the present invention, there is provided the clutchless compressor according to the first or second aspect, wherein the elastic member is provided on the pulley or the driving force transmitting body in which the concave portion is formed, and is separated from the concave portion. A hole through which the member can pass,
The concave portion is located on the same circumference around the rotation center of the pulley.

When the load torque on the compressor side exceeds a predetermined value, the elastic member detached from the recess passes through the hole.

According to a fourth aspect of the present invention, there is provided the clutchless compressor according to the first or second aspect, wherein the elastic member is provided on the pulley or the driving force transmitting body having the concave portion, and is separated from the concave portion. The elastic member accommodating recess capable of accommodating the member and the recess are located on the same circumference centered on the rotation center of the pulley.

The elastic member detached from the concave portion when the load torque on the compressor side exceeds a predetermined value is accommodated in the elastic member accommodating concave portion.

According to a fifth aspect of the present invention, in the clutchless compressor, a driving force of an external driving source is transmitted to a driving shaft housed in the housing via a pulley rotatably mounted on the housing. A driving force transmitting body provided at an end of the driving shaft protruding from the housing to the outside,
An elastic member interposed in the middle of a power transmission path from the pulley to the driving force transmission body to reduce torque fluctuation, and capable of opposing each of the pulley and the driving force transmission body in the rotation axis direction of the pulley. A concave portion provided, wherein the elastic member is held in the two concave portions so as to be detachable from one of the concave portions when a load torque of a predetermined value or more is applied.

The elastic member can reduce the fluctuation of the load torque on the compressor side, and when the load torque on the compressor side exceeds a predetermined value due to an abnormality inside the compressor, the elastic member is detached from one of the recesses. The pulley runs idle. Further, torque transmission and torque damping are performed by the elastic member.

According to a sixth aspect of the present invention, in the clutchless compressor according to the fifth aspect, the separated elastic member is fitted into a hole provided in the other concave portion.

When a load torque greater than a predetermined value acts,
Since the detached elastic member fits into the hole provided in the other concave portion, the elastic member is accommodated in the other concave portion.

[0031]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a main part of a clutchless compressor according to a first embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 is a main view of the clutchless compressor in FIG. It is an exploded perspective view of a part.

This clutchless compressor is rotatably supported by a boss 1a of a housing 1 via a radial bearing 5, and is driven by an unillustrated engine (external drive source) with a rotation shaft (drive shaft) 2 as a center of rotation. Pulley 10 which is rotated by the rotational force of the shaft, and a rotating shaft 2 which projects from the housing 1
And a hub 20 fixed by bolts 6 and washers 6a at the ends of the.

A plurality of recesses 11 are formed in the pulley 10 fixed to the outer ring 5a of the radial bearing 5. Recess 1
Numerals 1 are arranged on the same circumference centered on the rotating shaft 2 at every 60 °. The inner ring 5b of the radial bearing 5 is fixed to the boss 1a of the housing 1.

The pulley 10 is provided with holes 12 for accommodating rubber rolling balls (elastic members) 40 at every 60 ° on the same circumference where the concave portions 11 are arranged.

A belt (not shown) is wound around the outer peripheral surface of the pulley body 13, and the pulley body 13 is connected to a crankshaft of an engine (not shown) via the belt.

A disc-shaped cover member 21 is attached to the hub 20 by rivets 22. Cover member 2
1 includes ribs 23 for preventing deformation of the cover member 21.
Is provided. The hub 20 and the cover member 21 constitute a driving force transmitting body.

The cover member 21 has a recess 24 which can be opposed to the recess 11 on the same circumference around the rotation shaft 2 by 60 °.
It is formed every time.

The rolling balls 40 are held by the concave portions 11 and 24 facing each other. The recess 11 is formed to be sufficiently shallower than the recess 24 so that the rolling ball 40 is securely separated when a load torque of a predetermined value or more is applied.

When the load torque on the compressor side is within a predetermined value, the rotational force of the pulley 10 is
0, the recess 24, the cover member 21, and the hub 20 transmit the rotation to the rotation shaft 2, which rotates.

At this time, the rolling ball 40 held in the recesses 11 and 24 by the load torque on the compressor side
1 and 24, the fluctuation of the load torque on the compressor side is alleviated by the elastic force of the rolling ball 40 and the pulley 1
0 is transmitted.

If the load torque on the compressor side is excessively larger than a predetermined value, the load torque
, The rolling ball 40 is deformed and detaches from the concave portion 11 while being held by the concave portion 24.

The rolling ball 40 detached from the concave portion 11 falls into the hole 12, and the torque transmission path from the pulley 10 to the rotary shaft 2 is cut off, so that the pulley 10 idles.

According to the clutchless compressor of this embodiment, the following effects are exhibited.

When the load torque on the compressor side exceeds a predetermined value due to an abnormality inside the compressor, the power transmission path from the pulley 10 to the hub 20 is cut off properly, and the pulley 10 runs idle. As a result, engine stall, breakage of the belt 30 or damage to the compressor due to excessive load torque can be prevented.

Since the material of the rolling ball 40 is rubber,
Transmission of torque and torque damping can be performed by the elastic force of the rolling balls 40, so that the number of parts can be reduced and cost can be reduced.

FIG. 4 is a sectional view showing a main part of a clutchless compressor according to a second embodiment of the present invention, FIG. 5 is a view taken in the direction of arrow B in FIG. 4, and FIG. 6 is a main view of the clutchless compressor in FIG. FIG. 7A is a cross-sectional view showing a shape of a rolling ball before deformation, and FIG. 7B is a cross-sectional view showing a shape of a rolling ball after deformation, according to the first embodiment. The same parts as those in FIG.

This embodiment differs from the first embodiment in the structure of the rolling ball 140.

The rolling ball 140 is formed with a through hole 142 penetrating in the diameter direction, and this through hole 142 is composed of a large diameter hole (space) 142a, a central space 142c, and a small diameter hole 142b.

The outer peripheral surface of the rolling ball 140 has a through hole 1
A flange 141 is integrally formed over the entire circumference around the center line of 42.

The large-diameter hole 142a has a larger diameter than the small-diameter hole 142b.

A ball (high rigid body) 143 having a higher rigidity than rubber, for example, made of steel or the like, acts on the central space 142c (the central part of the rolling ball 140) of the through hole 142 with a load torque of a predetermined value or more. When large diameter hole 142
a.

The rolling ball 140 has a flange 141 such that the large-diameter hole portion 142a faces the concave portion 124 of the cover member 121.
Is positioned by

When the load torque on the compressor side is within a predetermined value, the rotational force of the pulley 110 is reduced by the concave portion 111, the rolling ball 140, the ball 143, the concave portion 124, and the cover member 121.
The rotation is transmitted to the rotation shaft 2 via the hub 20 and the rotation shaft 2 rotates.

At this time, the rolling ball 140 held in the recesses 111 and 124 is elastically deformed in the recesses 111 and 124 by the load torque on the compressor side. And transmitted to the pulley 110.

When the load torque on the compressor side exceeds a predetermined value, the load torque is applied to the rolling ball 140, the rolling ball 140 is pushed by the concave portion 111, and the ball 143 is inserted into the large-diameter hole 142a. To enter. Therefore, the rolling ball 140 is deformed by crushing the central space 142c in which the ball 143 is housed (see FIG. 7B).
Then, it is separated from the recess 111 while being held by the recess 124.

Rolling ball 140 detached from recess 111
Falls into the hole 112 and the transmission of torque from the pulley 110 to the rotary shaft 2 is cut off.
The pulley 110 idles while holding the pulley 110.

According to the clutchless compressor of this embodiment, the following effects are exhibited in addition to the effects of the first embodiment.

Since the high-rigidity ball 143 is housed inside the rolling ball 140, the rigidity of the rolling ball 140 is increased, and a torque having a smaller diameter and the same magnitude as the rolling ball 40 of the first embodiment is provided. Power transmission from the pulley to the rotary shaft of the compressor.

The large-diameter hole 142a and the central space 14
It is not always necessary to communicate with 2c.

FIG. 8 is a sectional view showing an essential part of a clutchless compressor according to a third embodiment of the present invention, FIG. 9 is a view taken in the direction of arrow C in FIG. 8, and FIG. 10 is an essential view of the clutchless compressor in FIG. FIG. 11A is a cross-sectional view showing the shape of the elastic body before deformation, and FIG. 11B is a cross-sectional view showing the shape of the elastic body after deformation, which is the same as in the first embodiment. The parts are denoted by the same reference numerals and the description thereof is omitted.

The rubber elastic body (elastic member) 240 includes a hemispherical portion 240A and a columnar portion 240B.
A groove 245 is formed over the entire periphery of the columnar portion 240B at the boundary between the columnar portion 0A and the columnar portion 240B.

The columnar portion 240B is formed with a tapered surface such that the diameter decreases from the groove 245 toward the end.

The elastic body 240 has a through hole 242 passing through the center of the hemispherical portion 240A and the central axis of the columnar portion 240B. The center of the hemispherical portion 240A is formed of steel or the like having higher rigidity than rubber. A ball 243 is accommodated.

A hole 225 having a diameter slightly smaller than the end of the column 240B is formed on the bottom surface of the recess 224 of the cover member 221. The end of the column 240B is held by the hole 225.

The concave portion 211 of the pulley 210 is detachable when a load torque greater than a predetermined value acts thereon.
(Elastic body 240) is held.

In this embodiment, the pulley 2
No holes are formed in 10.

When the load torque on the compressor side is within a predetermined value, the rotational force of the pulley 210 is
0, the ball 243, the concave portion 224, the cover member 221 and the hub 20 are transmitted to the rotating shaft 2, and the rotating shaft 2 rotates.

At this time, the elastic body 240 held in the concave portions 211 and 224 by the load torque on the compressor side
Since the elastic deformation occurs in the compressor 11 and 224, the fluctuation of the load torque on the compressor side is reduced by the elastic force of the elastic body 240 and transmitted to the pulley 210.

When the load torque on the compressor side exceeds a predetermined value, the load torque is applied to the elastic body 240, the elastic body 240 is pushed by the concave portion 211, and the ball 243 is urged toward the cover member 221. Therefore, the columnar portion 240B is pushed out of the hole 225 against the elastic force,
The elastic body 240 moves leftward in FIG.

The groove 245 of the separated elastic body 240 is
5 is fitted. As a result, the elastic body 240 is accommodated in the concave portion 224 (see FIG. 11B), the torque transmission path from the pulley 210 to the rotating shaft 2 is cut off, and the pulley 210 idles.

As a modified example, instead of accommodating a ball 243 made of steel or the like having higher rigidity than rubber in the center of the hemispherical portion 240A of the elastic body 240,
Through hole 2 passing through the center of 0A and the central axis of columnar portion 240B
A rod-shaped member such as a pin made of steel or the like having higher rigidity than rubber may be accommodated in 42. Also in this modified example, the compressor operates in the same manner as in the above-described embodiment, and a description thereof will be omitted.

According to the clutchless compressor of this embodiment and the modified example, the following effects are exerted in addition to the effects of the first embodiment and the second embodiment.

When the power transmission path from the pulley 10 to the hub 20 is cut off, the elastic member 240 is accommodated in the recess 24 and does not scatter, so that the elastic member 240
There is no risk of transmission of torque between the pulley 10 and the pulley 10 or heat generation due to friction between the cover member 21 and the pulley 10.

When a load torque greater than a predetermined value acts,
Since the columnar portion 240B is pushed out of the hole 225 against the elastic force and the groove 245 merely fits into the hole 225, the elastic body 240 is not damaged and can be reused.

In the first and second embodiments, the holes 12, 112 for accommodating the rolling balls 40, 140 are provided.
Instead of providing the holes, holes (elastic member accommodating recesses) for accommodating the rolling balls 40 and 140 may be formed. The holes 12, 112 have a depth equal to or greater than the diameter of the rolling balls 40, 140.

In the first and second embodiments, the rolling balls 40, 140 are formed from the concave portions 11, 111 on the pulley side.
Are separated from each other, but the concave portions 24 and 124 are
The rolling balls 40 and 140 may be formed so as to be sufficiently shallower than 1,111 to separate the rolling balls 40 and 140 from the concave portions 24 and 124.

Further, in the third embodiment, a hole 225 is formed in the cover member 221 and the elastic body 240 is moved in the direction of the cover member 221. However, a hole is formed in the pulley 210 and the elastic body 240 is It may be configured to move in the 210 direction.

[0079]

As described above, according to the clutchless compressor of the first aspect of the present invention, the fluctuation of the load torque on the compressor side can be reduced and transmitted to the engine side. Also, when the load torque on the compressor side exceeds a predetermined value due to an abnormality inside the compressor, the elastic member separates from the concave portion and the pulley idles, so that the power transmission path from the pulley to the driving force transmission body is properly adjusted. Can be shut off. Further, since torque transmission and torque damping are performed by the elastic member, the number of parts can be reduced, and the cost can be reduced.

According to the clutchless compressor of the second aspect of the present invention, when an excessive load is applied, the high-rigidity body enters the space of the elastic member, and the space in which the high-rigidity body is accommodated by the load. It is easily crushed and the elastic member is surely deformed.

According to the clutchless compressor of the third aspect of the present invention, since the elastic member that has separated from the recessed portion when the load torque on the compressor side exceeds a predetermined value passes through the hole, the pulley can be surely idled. it can.

According to the clutchless compressor of the fourth aspect of the present invention, the elastic member detached from the concave portion when the load torque on the compressor side exceeds a predetermined value is accommodated in the elastic member accommodating concave portion. In addition to being able to spin freely, scattering due to breakage of the elastic member can be prevented.

According to the clutchless compressor of the fifth aspect of the invention, the fluctuation of the load torque on the compressor side can be reduced and transmitted to the engine side. Also, when the load torque on the compressor side becomes a predetermined value or more due to an abnormality inside the compressor, the elastic member is detached from one of the recesses and the pulley idles, so that the power transmission path from the pulley to the driving force transmission body is formed. It can shut off properly. Further, since torque transmission and torque damping are performed by the elastic member, the number of parts can be reduced, and the cost can be reduced. The elastic member can mitigate the fluctuation of the load torque on the compressor side, and when the load torque on the compressor side exceeds a predetermined value due to an abnormality inside the compressor, the elastic member separates from one of the recesses, and the pulley idles. I do. Further, torque transmission and torque damping are performed by the elastic member.

According to the clutchless compressor of the present invention, since the separated elastic member is accommodated in the other concave portion, the elastic member can be reused without being damaged.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a clutchless compressor according to a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is an exploded perspective view of a main part of the clutchless compressor of FIG. 1;

FIG. 4 is a sectional view showing a main part of a clutchless compressor according to a second embodiment of the present invention.

FIG. 5 is a view on arrow B in FIG. 4;

FIG. 6 is an exploded perspective view of a main part of the clutchless compressor of FIG. 4;

7A is a cross-sectional view showing a shape of a rolling ball before deformation, and FIG. 7B is a cross-sectional view showing a shape of the rolling ball after deformation.

FIG. 8 is a sectional view showing a main part of a clutchless compressor according to a third embodiment of the present invention.

FIG. 9 is a view on arrow B in FIG. 8;

FIG. 10 is an exploded perspective view of a main part of the clutchless compressor of FIG. 8;

11A is a cross-sectional view illustrating a shape of an elastic body before deformation, and FIG. 11B is a cross-sectional view illustrating a shape of the elastic body after deformation.

[Explanation of symbols]

 Reference Signs List 1 housing 2 rotating shaft 10, 110, 210 pulley 11, 24, 111, 124, 211, 224 concave portion 12, 112 hole 20 hub 21, 121, 211 cover member 40, 140 rolling ball 142a large diameter hole portion 143, 243 Ball 225 hole 240 elastic

Claims (6)

[Claims] 1. A clutchless compressor in which a driving force of an external driving source is transmitted to a driving shaft housed in a housing via a pulley rotatably mounted on the housing, wherein the driving shaft protrudes outside from the housing. A driving force transmission member provided at an end of the driving shaft; an elastic member interposed in a power transmission path from the pulley to the driving force transmission member to reduce torque fluctuation; and the pulley and the driving force A recess provided in each of the transmission members so as to be able to face each other in the rotation axis direction of the pulley, wherein the elastic member is held in the two recesses so as to be detachable when a load torque of a predetermined value or more is applied. A clutchless compressor. 2. A high-rigid body housed in the elastic member and having a higher rigidity than the elastic member; and a high-rigid body formed in the elastic member when the load torque greater than or equal to the predetermined value acts. The clutchless compressor according to claim 1, further comprising a space into which the compressor enters. 3. A hole provided in the pulley or the driving force transmitting body in which the concave portion is formed and through which the elastic member detached from the concave portion can pass, and the concave portion centering on a rotation center of the pulley. The clutchless compressor according to claim 1, wherein the compressors are located on the same circumference. 4. An elastic member accommodating concave portion provided on the pulley or the driving force transmitting body having the concave portion and capable of accommodating the elastic member detached from the concave portion, and the concave portion is a rotation center of the pulley. The clutchless compressor according to claim 1, wherein the compressors are located on the same circumference centered at the center. 5. A clutchless compressor in which a driving force of an external driving source is transmitted to a driving shaft housed in a housing via a pulley rotatably mounted on the housing, wherein the driving shaft protrudes from the housing to the outside. A driving force transmission member provided at an end of the driving shaft; an elastic member interposed in a power transmission path from the pulley to the driving force transmission member to reduce torque fluctuation; and the pulley and the driving force A recess provided on each of the transmission members so as to be opposed to each other in the rotation axis direction of the pulley, wherein the elastic member is detachable from one of the recesses when a load torque of a predetermined value or more acts on the both recesses. And a clutchless compressor. 6. The clutchless compressor according to claim 5, wherein the detached elastic member fits into a hole provided in the other concave portion.