JPH0614104Y2 - Driving force transmission mechanism in compressor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a driving force transmission mechanism in a compressor, and particularly to a pulley rotated by an external driving source,
Disposed between the main shaft rotated by the pulley,
The present invention relates to a driving force transmission mechanism having a function of protecting an external drive system from seizure of the compressor.

[Prior art]

Conventionally, a compressor in which the rotation of a pulley rotated by an external drive source is directly transmitted to a main shaft without using an electromagnetic clutch and the rotation of the main shaft actuates a piston to compress a fluid is, for example, U.S. Pat.No. 3,861,82
It is known as disclosed in No. 9.

Referring to FIG. 10, this type of compressor includes a pulley 10 which is rotated by an external drive source, and a bearing 2 which is directly connected to the pulley 10 and which has one end of a cylindrical casing 1.
A main shaft 4 which is rotatably supported by and extends into the crank chamber 3.

In the casing 1, the swash plate 7 has pins 7
The rocking plate 5 is mounted on the swash plate via a bearing 51. The oscillating plate 5 and the swash plate 7 are arranged in a crank chamber 3 formed between a lock 6 and a cylinder having a plurality of cylinders 61 provided at one end wall and the other end side of the cylindrical casing 1. Has been done. Around the oscillating plate 5, one end of a piston rod 62 is spherically connected, and the other end of the piston rod 62 is spherically connected to a piston 63 fitted in the cylinder 61.

Accordingly, when the rotation is transmitted to the pulley 10 via a belt (not shown) by an external drive source, the main shaft 4 directly connected to the pulley 10 rotates and the swash plate 7 moves the swing plate 5 The piston 63 is rocked and reciprocated to suck and compress the fluid.

As described above, the method of directly connecting the pulley and the main shaft without using the electromagnetic clutch can transmit the external driving force without loss, and is particularly advantageous in driving the variable displacement compressor as disclosed in the above-mentioned US patent. Is.

[Problems to be solved by the invention]

In the above-mentioned conventional technology, since the pulley that rotates by the external drive source and the main shaft are directly coupled, when the compressor fails and becomes locked, the drive source (pulley side) and the compressor side (main shaft). ) And the transmission system can not be separated.
Therefore, there is a risk of damaging the external drive system and other devices. In particular, when the compressor and the generator and the oil pump are connected to the one-belt engine and driven, the generator and the oil pump are disabled.

The present invention provides a driving force transmission mechanism between a pulley rotated by an external drive source and a main shaft so as to protect the drive source side pulley and the main shaft when an overload is applied due to a compressor failure or the like. It is an object of the present invention to provide a driving force transmission mechanism in a compressor, which can release the coupled state of and prevent damage to an external drive system and other devices.

[Means for solving problems]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a drive shaft, one end of which is exposed outside a housing of a compressor, and a pulley which is concentric with the drive shaft and is driven and rotated by an external drive source. In a driving force transmission mechanism of a compressor to be coupled, an intermediate portion is pin-coupled to one of the exposed end portion of the main shaft and the pulley, and a drive lever having first and second engaging portions at both ends, respectively, A first engaging recess formed on the other of the exposed end of the main shaft and the pulley, into which the first engaging part of the drive lever is removably fitted, and the exposed end of the main shaft and the pulley; And a second engaging recess formed on the one side of the drive lever with an elastic material to releasably engage the second engaging portion of the drive lever.

[Action]

According to the structure of the present invention, the rotational force of the pulley is
And transmitted to the main shaft via a drive lever coupled to the second engagement recess. On the other hand, if the main shaft becomes unable to rotate due to a failure such as seizure of the compressor, a large torque is applied to the drive lever, and the drive lever rotates around the pin. That is, this large torque overcomes the elastic force of the elastic material,
The second engaging recess is deformed, and the second engaging part is released from the second engaging recess. As a result, the first engagement portion also disengages from the first engagement recess, and the coupling between the pulley and the main shaft is released.

〔Example〕

A first embodiment of a driving force transmission mechanism of a compressor according to the present invention will be described below with reference to FIGS. 1 to 5. In FIG. 1, the same parts as those in the conventional example (see FIG. 10) are designated by the same reference numerals, and the swash plate, the oscillating plate, the cylinder block and the piston arranged in the crank chamber are not shown.

A front nose 11 that closes an opening at one end of the cylindrical casing 1 is provided with a through hole 12 through which the main shaft 4 penetrates, and a cylindrical sleeve 13 is provided around the through hole 12 so as to project. . The main shaft 4 extending into the crank chamber 3 has one end thereof through the through hole 12 of the front nose 11.
Then, the cylindrical sleeve 13 is penetrated and the end portion is projected outward. A bearing 14 is arranged in the cylindrical sleeve 13 and rotatably supports one end of the main shaft 4. A pulley 10 is rotatably arranged on the outer circumference of the cylindrical sleeve 13 via a bearing 15. An annular ridge wall 103 is formed on the outer end surface 102 of the pulley 10.
There are four engaging recesses 104 at 90 ° intervals. The engagement recess 104 is formed in a semicircular cross section as shown in FIG. 2 so that the engagement part 91 of the drive lever 9 to be described later can be disengaged with an appropriate force when the compressor fails. Of course, it may be formed in an arc shape or the like, as long as it can be released with an appropriate force.

A hub 7 is fixed to one end of the main shaft 4 protruding outward of the cylindrical sleeve 13 by a nut 71.
The hub 7 has a flange portion 72 extending in the radial direction, and four engaging recesses 105 are formed at 90 ° intervals on the outer periphery adjacent to the base of the flange portion 72. As shown in FIG. 4, the engaging recess 105 also has a semicircular cross section so that the engaging part 92 of the drive lever 9, which will be described later, can be disengaged with an appropriate force when the compressor fails. An annular metal leaf spring 8 having a diameter slightly larger than that of the hub 7 is provided around the outer periphery of the hub 7 so as to cover the engaging recess 105. Of course, the leaf spring is not limited to metal, and may be made of synthetic resin, for example.

The drive lever 9 is a long rectangular plate body, and circular engaging portions 91 and 92 are formed at both ends in the longitudinal direction. Of these, the engaging portion 91 is fitted in the engaging concave portion 104 of the pulley 10, and the engaging portion 92 engages with the hub 7 while pressing and bending the annular metal plate spring 8 as shown in FIG. It fits in the recess 105. Therefore, the curved portion 81 of the leaf spring 8 stores a reaction force to restore it to its original shape. Further, the drive lever 9 has its central portion attached to the rear surface of the flange portion 72 by a rivet 93, but is rotatable about the rivet 93.

The connection between the pulley 10 and the hub 7 via the drive lever 9 is prevented from being released within the normal rotational load range of the main shaft 4 by appropriately setting the elastic coefficient of the leaf spring 8. There is.

Next, the operation of the driving force transmission mechanism of the compressor will be described.

First, a case where the compressor is operating normally will be described. In this case, since the rotational load of the main shaft 4 is in the normal range, the force for rotating the drive lever 9 about the rivet 93 is relatively small, and this force is the opposite force of the curved portion 81 of the leaf spring 8. It is canceled by force. Therefore,
The drive lever 9 does not actually rotate around the rivet 93, and the hub 7 (main shaft 4) synchronously follows the rotation of the pulley 10 via the drive lever 9. That is, the transmission of the rotational force between the pulley 10 and the hub 7 is uninterrupted, and the compressor continues its operation.

Next, a case where the main shaft 4 cannot rotate due to a failure in the compressor will be described. In this case, since the rotational load of the main shaft 4 increases abnormally, the drive lever 9 is moved to the rivet 9
Similarly, the force to rotate about 3 also increases, and this force overcomes the reaction force of the curved portion 81 of the leaf spring 8. Therefore, as shown by the broken line in FIG. 3, the drive lever 9 rotates around the rivet 93, the engaging portions 91 and 92 are disengaged from the engaging concave portions 104 and 105, and the pulley 10 and the hub 7 are removed.
Is removed. That is, the transmission of the rotational force between the pulley 10 and the hub 7 is interrupted, the compressor is stopped, and the malfunction of other parts due to the failure of the compressor is prevented. After the failure of the compressor is repaired, the hub 7 (spindle 4)
By rotating the engaging portions 91 and 92 in the reverse direction
By fitting into 04 and 105, the connection between the pulley 10 and the hub 7 via the drive lever 9 can be reset.

By the way, as another embodiment, it is conceivable that the annular leaf spring 8 is arranged on the pulley 10 side as shown in FIG. 7, and the flange portion 107 is provided on the pulley 10 side as shown in FIG. It is also conceivable that the annular leaf spring 8 is arranged on the side of the pulley 10, or that the flange portion 107 is provided on the pulley 10 side and the annular leaf spring 8 is arranged on the pulley 10 side as shown in FIG.

Further, as shown in FIG. 6, the leaf spring 8 may be such that the position corresponding to the engaging recess 105 is slightly indented.

〔effect〕

According to the present invention, a driving force transmission in a compressor that connects between a driving main shaft having one end exposed to the outside of the compressor housing and a pulley that is concentric with the main shaft and is driven and rotated by an external driving source. In the mechanism, a drive lever having an intermediate end pin-coupled to one of the exposed end of the main shaft and the pulley and having first and second engaging portions at both ends, an exposed end of the main shaft, and the pulley. A first engaging recess formed on the other side of the drive lever, into which the first engaging portion of the drive lever is removably fitted and engaged, and an exposed end portion of the main shaft and the pulley formed with an elastic material. And a second engaging concave portion into which the second engaging portion of the drive lever is removably fitted and engaged, whereby the rotational force of normal torque is increased by the first and second engaging concave portions. Drive lever engaged with Since it is transmitted from the pulley to the main shaft via the pulley, when the main shaft cannot rotate due to a failure of the compressor or the like, a large torque applied to the drive lever overcomes the elastic force of the elastic material to cause the second torque. The tilting recess is deformed, the drive lever rotates about the pin, the second engaging part disengages from the second engaging recess, and the first engaging part disengages from the first engaging part. The pulley is disengaged, which releases the connection between the pulley and the main shaft. Therefore, it becomes possible to protect the external drive system and other devices from the failure of the compressor.

[Brief description of drawings]

FIG. 1 is a sectional view showing an essential part of a first embodiment according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a view showing a locked state and a released state of a drive lever, 4 is an exploded perspective view of the driving force transmission mechanism excluding the pulley, FIG. 5 is a perspective view showing a locked state of the drive lever, FIG. 6 is a view showing a leaf spring with a partially changed shape, FIG. Is a sectional view showing an essential part of the second embodiment of the present invention, and FIG. 8 is a sectional view of the third embodiment of the present invention.
9 is a sectional view showing an essential part of this embodiment, FIG. 9 is a sectional view showing an essential part of a fourth embodiment of the present invention, and FIG. 10 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Cylindrical casing, 2, 15 ... Bearing, 3 ... Crank chamber, 4 ... Main shaft, 5 ... Oscillating plate, 6 ... Cylinder block, 7 ... Hub, 8 ... Leaf spring, 9 ... Drive lever, 10
… Pulley, 11… Front nose.

Claims (1)

[Scope of utility model registration request] 1. A driving force transmission mechanism in a compressor, which connects a driving main shaft whose one end is exposed to the outside of the housing of the compressor and a pulley which is concentric with the main shaft and is driven and rotated by an external driving source. A drive lever having an intermediate end pin-coupled to one of the exposed end of the main shaft and the pulley, the drive lever having first and second engaging portions at both ends, respectively.
A first engaging recess formed on the other of the exposed end of the main shaft and the pulley to removably engage the first engaging part of the drive lever, the exposed end of the main shaft, and the pulley. And a second engaging recess formed on one side of the drive lever with an elastic material and removably engaged with the second engaging portion of the drive lever. A driving force transmission mechanism in a compressor, wherein the pulley is transmitted to the main shaft via the drive lever engaged with the first and second engagement recesses.