JP2008101767A - Tension adjusting mechanism of power transmission belt to compressor in vehicle air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tension adjusting mechanism for a power transmission belt embodied at low cost and equipped with an enhanced degree of freedom in mounting on a vehicle, capable of absorbing a tension variation in a belt under running, and also absorbing belt elongations with time. <P>SOLUTION: A tension giving pulley 8 to make a pressure contact constantly with the power transmission belt 3 under the energization of a coil spring 6 is installed rotatably on a base 7 borne swingably between a vehicle engine 1 and a compressor 2 with the coil spring 6 interposed. Mounting of the tension giving pulley 8 on the base 7 is established so that the supporting position can be moved for adjustment along the base 7 using a supporting position adjusting means 9. A bracket 11 may be structured able to adjust the restoring force of the coil spring 6 in the revolving direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tension adjusting mechanism of a power transmission belt for a compressor in a vehicle air conditioner.

  Conventionally, a vehicle air conditioner is configured to operate by transmitting power from a traveling engine to a compressor using a power transmission belt. In this case, the belt for power transmission is provided with an appropriate belt tension adjusting mechanism so as not to loosen.

JP-A-6-74308

In the vehicle air conditioner in this document, a belt hung between a traveling engine and a compressor is automatically stretched with an appropriate tension. The belt hung between the passive pulley of the compressor magnetic clutch is stretched by an air cylinder attached to a clutch housing connected to the compressor and a guide bracket connected to the engine.
In this case, a regulator that adjusts to a predetermined air pressure is connected to the air cylinder. When a predetermined pressure is applied from the regulator to the air cylinder, the belt is automatically and properly adjusted by the predetermined pressure applied to the air cylinder. It is said that it will be stretched to a proper tension.

JP 2004-197898 A

  In the tensioner in this document, the axial tensile stress generated in the base portion of the shaft portion is reduced so that the shaft portion can be prevented from being damaged due to the reduction in diameter. A bolt insertion hole extending to the bolt insertion portion and a bolt screwing portion are provided, and the bolt shaft portion of the compression bolt inserted through the bolt insertion hole is pivoted between the bolt head portion seated on the bolt seating surface and the base portion of the shaft portion is pivoted. The bolts are screwed together so as to be compressed in the direction.

However, in the above-mentioned Patent Document 1, although the elongation of the belt due to the time-dependent change of the V-belt driven by the compressor can be absorbed, the engine and the compressor at the time of operation are abnormally vibrating, and means for absorbing fine belt tension fluctuations It is necessary to take.
On the other hand, in Patent Document 2, the problem in Patent Document 1 can be solved, but in a layout in which the engine and the compressor are separated and set as in the separate compressor drive system, the amount of time can be automatically adjusted. Impossible. That is, the belt length of the bus air conditioner is, for example, 2000 mm or more, and generally a aging of about 2.5% occurs. However, this mechanism cannot absorb because the stroke is small.
The present invention has been proposed in order to improve such a problem, and pays attention to the layout of a separate drive system for a compressor of a vehicle air conditioner such as a bus, and has a simple structure in consideration of versatility. However, it is an object of the present invention to provide a low-cost tension adjustment mechanism for a power transmission belt with respect to a compressor in a vehicle air conditioner that can absorb tension fluctuation during operation of the belt and absorb aging of the belt.

  In order to solve the above-mentioned problems, in claim 1 of the present invention, a power transmission belt 3 in which a traveling engine 1 of a vehicle and a compressor 2 constituting a vehicle air conditioner are connected so as to be able to transmit power is transmitted. The tension applying pulley 8 is always pressed against the biasing force of the elastic urging means 6, and the tension applying pulley 8 is moved and adjusted along the base body 7 by the supporting position adjusting means 9. In addition, it is possible to absorb fluctuations in tension during operation of the power transmission belt 3 and maintain the tension state of the power transmission belt 3 at an appropriate tension.

  According to a second aspect of the present invention, the restoring force of the elastic urging means 6 is adjusted by the adjusting means 11 for adjusting the restoring force, whereby the pressure contact force of the tension applying pulley 8 to the power transmission belt 3 is changed, and the power Even if the transmission belt 3 is subject to aging, the tension applying pulley 8 can be brought into pressure contact with the power transmission belt 3.

According to the third aspect of the present invention, when the tension applying pulley 8 is moved and adjusted by the support position adjusting means 9, the fixing nut 15 for fixing the tension applying pulley 8 is loosened and the shaft portion provided along the elongated hole 12 is provided. 13, the tension applying pulley 8 can be rotated and fixed at an arbitrary position by moving to a desired position via the base member 14 and tightening the fixing nut 15.
Thereby, the pressing force against the power transmission belt 3 from the tension applying pulley 8 can be changed.

According to a fourth aspect of the present invention, the support means 5 provided between the traveling engine 1 and the compressor 2 is provided so as to be able to adjust the support position, while being supported by the elastic biasing means 6 under the urging force in the turning direction. A base body 7 that can be adjusted, and a tension applying pulley 8 that is rotatably provided on the base body 7 so as to be always in pressure contact with the power transmission belt 3 under the bias of the elastic biasing means 6. It can be set as the structure provided.
As a result, the support position of the base body 7 provided with the tension applying pulley 8 can be adjusted, the support angle can be adjusted, and the degree of freedom of attachment to the vehicle can be increased.

Further, in claim 5 of the present invention, the support means 5 is formed in the fixed side bracket 5a having the guide hole 16 oriented in the direction of approaching and separating from the power transmission belt 3, and the guide hole 16 of the fixed side bracket 5a. And a movable bracket 5b reciprocating along the base 7. The base body 7 includes an elastic biasing means 6 interposed in the shaft 10 on the end side, and an adjusting means 11 for adjusting the restoring force of the elastic biasing means 6. The shaft 10 at the end of the base body 7 is inserted into the movable bracket 5b of the support means 5 through the guide hole 16 of the fixed bracket 5a and fixed to the movable bracket 5b.
As a result, the base body 7 provided with the tension applying pulley 8 is moved toward and away from the power transmission belt 3 via the shaft 10 on the end side of the base body 7 and the guide hole 16 of the fixed side bracket 5a. The movement can be adjusted.

Further, in claim 6 of the present invention, the adjusting means 11 in the base body 7 is provided with support angle adjusting holes Ht drilled at predetermined intervals, and the movable side bracket 5b in the supporting means 5 is provided in the guide hole 16 of the fixed side bracket 5a. Thus, the support angle adjusting hole Ht is selectively axially fixed.
Thereby, the base body 7 provided with the tension applying pulley 8 can be fixed at a different angle with respect to the movable bracket 5b.

Hereinafter, one embodiment of a tension adjusting mechanism of a power transmission belt for a compressor in a vehicle air conditioner according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows an example of a so-called compressor separate drive system in a vehicle air conditioner. In this separate compressor drive system, a vehicle travel engine 1 and a compressor 2 constituting an air conditioner mounted on the vehicle are connected by a power transmission belt 3 so as to be capable of being transmitted in a power manner. That is, the power transmission belt 3 is stretched between an engine-side pulley 1p connected to a shaft for taking out the rotational output of the traveling engine 1 and a compressor-side pulley 2p on the compressor 2 side.
Between the traveling engine 1 and the compressor 2, a tension adjusting mechanism 4 for maintaining the power transmission belt 3 in a tensioned state with an appropriate tension is disposed.

The tension adjusting mechanism 4 will be described in detail below.
That is, the tension adjusting mechanism 4 includes a base body 7 that is pivotally attached to a support means 5 provided between the traveling engine 1 and the compressor 2 so that the end side thereof is swingable via an elastic biasing means 6 (described later). Provided.
The base body 7 is provided with a tension applying pulley 8 that is always in pressure contact with the power transmission belt 3 under the urging force of the elastic urging means 6.
The tension applying pulley 8 is provided on the base body 7 by a support position adjusting means 9 so that the support position can be adjusted along the base body 7.

The elastic urging means 6 is a coil spring interposed in a shaft 10 in which a base body 7 is pivotally fixed to a support means 5 between the traveling engine 1 and the compressor 2. explain. That is, the coil spring 6 has the shaft 10 inserted into the bracket 11 as the adjusting means 11 for adjusting the restoring force of the elastic biasing means 6 on the end portion side of the base body 7, and both ends at the bracket 11. Are held against the restoring force of the coil spring 6 in the turning direction.
As a result, a restoring force around the outer periphery of the shaft 10 is given to the base body 7 by the coil spring 6, and the tension applying pulley 8 is always applied to the power transmission belt 3 by this restoring force. It is energized to press.
In addition, in order to make the bracket 11 function as the adjusting means 11 that adjusts the restoring force of the elastic urging means 6, the bracket 11 is configured to be rotatable with respect to the base body 7, so that the restoring force in the turning direction of the coil spring 6 is obtained. It can be set as the structure which adjusts.

  Next, the tension applying pulley 8 is attached to a long hole 12 formed in the base body 7 so as to be movable and adjustable in the longitudinal direction of the base body 7 within the range of the long hole 12. That is, the tension applying pulley 8 is movably supported by a shaft portion 13 provided along the elongated hole 12 constituting the support position adjusting means 9 via a base member 14, and the support position adjusting The tension applying pulley 8 is positioned and fixed so as to be rotatable at an arbitrary position by a fixing nut 15 constituting the means 9.

The tension adjusting mechanism of the power transmission belt for the compressor in the vehicle air conditioner according to the present invention is configured as described above. Next, the operation thereof will be described.
The air conditioner mounted on the vehicle can be operated by transmitting power from the traveling engine 1 of the vehicle to the compressor 2 via the power transmission belt 3.
In this case, the power transmission belt 3 is stretched between an engine-side pulley 1p of the traveling engine 1 and a compressor-side pulley 2p on the compressor 2 side, and is disposed between the traveling engine 1 and the compressor 2. Since the tension adjusting mechanism 4 is brought into contact with the power transmission belt 3 so as to come into pressure contact with a predetermined urging force, the power transmission belt 3 can maintain the tensioned state with an appropriate tension. The power from the traveling engine 1 can be transmitted to the compressor 2 side without slipping (see FIG. 1).

At that time, in the tension adjusting mechanism 4, the base 7 is displaced on the support means 5 toward the power transmission belt 3 under the bias of the coil spring 6, and the outer periphery of the tension applying pulley 8 provided on the base 7. The surface can be brought into contact with the power transmission belt 3 so as to be pressed.
As a result, when the power transmission belt 3 rotates between the engine-side pulley 1p of the traveling engine 1 and the compressor-side pulley 2p of the compressor 2, the tension applying pulley 8 is held even if there is a slight change in tension. When the base body 7 is displaced by the coil spring 6, tension fluctuation during operation of the power transmission belt 3 can be absorbed.
Therefore, the power transmission belt 3 can maintain the tensioned state with an appropriate tension, and can transmit the power from the traveling engine 1 to the compressor 2 side without slipping (see FIG. 1). .

By the way, when the power transmission belt 3 is used for a long time, so-called aging occurs. Then, the power transmission belt 3 may be difficult to maintain the tensioned state with an appropriate tension.
In such a case, if the bracket 11 that holds the coil spring 6 is configured to be adjustable with respect to the base body 7, the bracket 11 that holds the end of the coil spring 6 is tightened. Thus, it is possible to cope with the aging of the power transmission belt 3.

If it is difficult to maintain the tension of the power transmission belt 3 with an appropriate tension by such means, the support position of the tension applying pulley 8 is adjusted by the support position adjusting means 9 to the base. 7 is performed to adjust movement.
In order to adjust the support position of the tension applying pulley 8, the fixing nut 15 for fixing the tension applying pulley 8 is loosened, and the shaft portion 13 penetrated along the elongated hole 12 is connected to the desired portion via the base member 14. By moving to this position and tightening the fixing nut 15, the tension applying pulley 8 can be positioned and fixed so as to be freely rotatable at an arbitrary position.
As described above, the pressing force applied to the power transmission belt 3 from the tension applying pulley 8 can be changed (increased).
At the same time, since the restoring force of the coil spring 6 is tightened by tightening the bracket 11 that holds the end of the coil spring 6, the power transmission belt 3 can be maintained in a tensioned state with an appropriate tension. As well as fluctuations in tension during use of the transmission belt 3, it is possible to absorb the aging of the belt.

The tension adjusting mechanism of the power transmission belt for the compressor in the vehicle air conditioner according to the present invention can be configured as follows. Components that are substantially similar to the tension adjusting mechanism 4 shown in FIG.
That is, as shown in FIG. 4, in the tension adjusting mechanism 4 in this case, the support means 5 provided between the traveling engine 1 and the compressor 2 and the direction in which the support means 5 approaches and separates from the power transmission belt 3. The base 7 is provided so as to be adjustable (in the vertical movement direction in the figure), and the support angle is adjustable via the elastic biasing means 6 so as to be able to adjust the support angle. And a tension applying pulley 8 that is always in pressure contact with the power transmission belt 3 under the bias of the elastic biasing means 6.

As shown in FIG. 5, the support means 5 includes a fixed side bracket 5 a in which guide holes 16 are formed that are directed toward and away from the power transmission belt 3, that is, in the vertical direction in the figure, and the fixed side bracket. And a movable bracket 5b that reciprocates along the guide hole 16 of 5a.
The fixed bracket 5a is a columnar frame, and has a lower end surface 5l and an upper end surface 5u that are bent at right angles to the intermediate portion.
The movable bracket 5b has a length that is approximately half that of the fixed bracket 5a. The movable bracket 5b is provided with a guide rib 17 that can be slidably moved while being fitted in the guide hole 16 of the fixed bracket 5a. Further, a support shaft 18 for preventing dropping is projected from the top of the movable side bracket 5b, and the upper end side of the support shaft 18 is inserted into the insertion hole 19 of the upper end surface 5u of the fixed side bracket 5a and is used for preventing the drop-out. A nut 20 is screwed.
Further, as will be described later, the movable bracket 5b has a fixing hole 22 for inserting the shaft 10 on the end of the base body 7 through the guide hole 16 of the fixed bracket 5a and fixing the shaft by the nut 21; Bolt holes 23 for adjusting the support angle of the base body 7 are arranged vertically.

Next, the base body 7 supported by the above support means 5 will be described.
The base body 7 has a substantially L-shape, and a shaft 10 is disposed on the end side, and an elastic biasing means 6 is interposed on the shaft 10 so that the restoring force of the elastic biasing means 6 can be adjusted. 11 is screwed to the shaft 10. Further, a tension applying pulley 8 is rotatably provided in the vicinity of the opposite end of the base body 7.

The bracket 11 in the base body 7 is provided with support angle adjusting holes Ht that are formed on the circumference of the shaft 10 at predetermined intervals on the circumference.
Of these support angle adjustment holes Ht, any of the support angle adjustment holes Ht and the bolt holes 22 of the movable bracket 5b are axially fixed by bolts 24 via the guide holes 16 of the fixed bracket 5a. The support angle of the base body 7 on which the tension applying pulley 8 is mounted is adjusted.

In the tension adjusting mechanism 4 as described above, in order to maintain the power transmission belt 3 in the tensioned state with an appropriate tension, the following means for adjusting the restoring force of the elastic biasing means 6 is used depending on the situation. It can be dealt with appropriately by taking it in combination and depending on the case. That is,
(1) The restoring force of the elastic urging means 6 is adjusted by rotating the bracket 11 with respect to the shaft 10 at the end of the base 7.
(2) With respect to the support means 5, the base body 7 on which the tension applying pulley 8 is mounted is moved in the vertical movement direction to adjust the support position.
(3) Among the support angle adjustment holes Ht provided in the bracket 11 in the base body 7, any one of the support angle adjustment holes Ht and the bolt hole 22 of the movable side bracket 5b in the support means 5 are guided to the fixed side bracket 5a. The support angle of the base body 7 on which the tension applying pulley 8 is mounted is adjusted by fixing the shaft with the bolt 24 through the hole 16.

  By taking the above-mentioned means, the tension adjusting mechanism 4 displaces the base body 7 on the support means 5 to the power transmission belt 3 side under the biasing force of the elastic biasing means 6, and the tension provided on the base body 7. The outer peripheral surface of the applying pulley 8 can be brought into contact with the power transmission belt 3 so as to be appropriately pressed, and the power transmission belt 3 can be maintained in a tensioned state with an appropriate tension.

  Further, according to the tension adjusting mechanism 4 described above, the support position of the base body 7 provided with the tension applying pulley 8 can be adjusted in the vertical direction, the support angle can be adjusted, and the degree of freedom of attachment to the vehicle. Increase the versatility.

It is typical explanatory drawing which shows an example of the power transmission mechanism with respect to the compressor in the vehicle air conditioning apparatus using the tension adjustment mechanism of the power transmission belt concerning this invention. FIG. 2 is an enlarged perspective explanatory view of the tension adjustment mechanism shown in FIG. 1. It is an expansion perspective explanatory view from another direction of the tension adjustment mechanism shown in FIG. It is typical explanatory drawing which shows another example of the power transmission mechanism with respect to the compressor in the vehicle air conditioning apparatus using the tension adjustment mechanism of the power transmission belt concerning this invention. FIG. 5 is an enlarged exploded perspective view of the tension adjusting mechanism shown in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling engine 1p Engine side pulley 2 Compressor 2p Compressor side pulley 3 Power transmission belt 4 Tension adjusting mechanism 5 Support means 5a Fixed side bracket 5b Movable side bracket 5l Lower end surface 5u Upper end surface 6 Coil spring 7 Base body 8 Tension applying pulley 9 Pointing position Adjusting means 10 Shaft 11 Brackets 11a, 11b Non-rotating 12 Elongated hole 13 Shaft portion 14 Base member 15 Fixing nut 16 Guide hole 17 Guide rib 18 Support shaft 19 Insertion hole 20 Falling prevention nut 21 Nut 22 Fixing hole 23 Bolt hole 24 Bolt Ht Support angle adjustment hole

Claims (6)

Separately installed vehicle air conditioner in which vehicle travel engine (1) and compressor (2) constituting the air conditioner mounted on the vehicle are connected by a power transmission belt (3) so as to be able to transmit power. In the drive system, a tension adjusting mechanism (4) disposed between the traveling engine (1) and the compressor (2) to maintain the power transmission belt (3) in a tensioned state with an appropriate tension. There,
A base body (7) provided so as to be swingable via an elastic biasing means (6);
A tension applying pulley (8) that is always in pressure contact with the power transmission belt (3) under the bias of the elastic biasing means (6);
A support position adjusting means (9) for moving and adjusting the support position of the tension applying pulley (8) along the base body (7);
A mechanism for adjusting the tension of the power transmission belt with respect to the compressor in the vehicle air conditioner.   The elastic urging means (6) is provided via an adjusting means (11) for adjusting the restoring force of the elastic urging means (6) to absorb the aging of the power transmission belt (3). The tension adjusting mechanism of the power transmission belt for the compressor in the vehicle air conditioner according to claim 1. The support position adjusting means (9) includes an elongated hole (12) formed in the base (7),
A shaft portion (13) provided along the elongated hole (12) and supporting the tension applying pulley (8) movably through a base member (14);
A fixing nut (15) for rotatably positioning and fixing the tension applying pulley (8) at an arbitrary position of the shaft portion (13) via the base member (14);
The tension adjustment mechanism of the power transmission belt with respect to the compressor in the vehicle air conditioner according to claim 1. Separately installed vehicle air conditioner in which vehicle travel engine (1) and compressor (2) constituting the air conditioner mounted on the vehicle are connected by a power transmission belt (3) so as to be able to transmit power. In the drive system, a tension adjusting mechanism (4) disposed between the traveling engine (1) and the compressor (2) to maintain the power transmission belt (3) in a tensioned state with an appropriate tension. There,
Support means (5) provided between the travel engine (1) and the compressor (2);
A base (7) provided to the support means (5) so as to be capable of adjusting the support position, and to be capable of adjusting the support angle under biasing in the turning direction via the elastic biasing means (6),
A tension applying pulley (8) which is rotatably provided on the base body (7), and is always in pressure contact with the power transmission belt (3) under the urging force of the elastic urging means (6); ,
A mechanism for adjusting the tension of the power transmission belt with respect to the compressor in the vehicle air conditioner. The support means (5) includes a fixed bracket (5a) having a guide hole (16) oriented in a direction of approaching and separating from the power transmission belt (3),
A movable bracket (5b) that reciprocates along the guide hole (16) of the fixed bracket (5a),
The base body (7) is provided with an adjusting means (11) for adjusting the restoring force of the elastic biasing means (6) while interposing the elastic biasing means (6) on the shaft (10) on the end side. And
The shaft (10) at the end of the base (7) is inserted into the movable bracket (5b) of the support means (5) through the guide hole (16) of the fixed bracket (5a). The tension adjusting mechanism of the power transmission belt for the compressor in the vehicle air conditioner according to claim 4, wherein the tension adjusting mechanism is used.   The adjusting means (11) in the base body (7) is provided with support angle adjusting holes (Ht) drilled at predetermined intervals, and the movable side bracket (5b) in the supporting means (5) is provided with the fixed side bracket (5t). 6. The vehicle air conditioner according to claim 4, wherein the support angle adjusting hole (Ht) is selectively fixed via the guide hole (16) of 5a). Power transmission belt tension adjustment mechanism.

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