JP2018128042A - Belt transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt transmission device which can reduce the cost and can prevent occurrence of disadvantage and malfunction of a belt.SOLUTION: A belt transmission device includes: a driving pulley; a driven pulley; an idler pulley; an endless belt stretched on the driving pulley, the driven pulley, and the idler pulley; a tensioner pulley which can be displaced between a first position and a second position different from each other while being brought into contact with the endless belt; a shaft support part which can support a shaft of the idler pulley in a plurality of positions different from each other; and a holding part for holding the tensioner pulley in the first position or in the second position in order to adjust tension of the endless belt.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a belt transmission device.

  Examples of the belt transmission device include a device that transmits engine power to an auxiliary machine provided in the vicinity of the engine. Examples of such auxiliary machines include a compressor for a refrigerator, a compressor for an air conditioner, an alternator, a power steering pump, a cooling water circulation pump, and a cooling fan.

  This type of belt transmission device includes, for example, a driving pulley attached to an end of an engine crankshaft, a driven pulley (auxiliary pulley) attached to an end of a rotating shaft of an auxiliary machine, and the driving pulley and the driven pulley. And an endless belt hung between the pulleys.

  For example, Patent Document 1 describes a tensioner pulley for applying tension to the belt and a pulley holding portion that holds the tensioner pulley so as to be movable in order to adjust the tension of the belt.

JP 2014-145394 A

  By the way, there are various specifications for a compressor for a refrigerator mounted on a vehicle, for example, in which the diameter and the center position of a driven pulley are different from each other. Therefore, multiple types of belts are prepared according to the specifications of the compressor for the refrigerator. Alternatively, the tension adjustment margin by the tensioner pulley is lengthened to adjust the tension of the endless belt.

  However, depending on the specifications of the auxiliary machine, it is necessary to prepare a plurality of types of belts, or it is necessary to increase the tension adjustment margin by the tensioner pulley.

  An object of the present disclosure is to provide a belt transmission device suitable for auxiliary machines having various specifications without preparing a plurality of types of belts.

The belt transmission device of the present disclosure is:
A driving pulley, a driven pulley and an idler pulley;
An endless belt wound around the driving pulley, the driven pulley and the idler pulley;
A tensioner pulley that is displaceable between different first and second positions while contacting the endless belt;
A shaft support that can support the shaft of the idler pulley at a plurality of different positions;
A holding portion for holding the tensioner pulley at any position between the first position and the second position in order to adjust the tension of the endless belt;
Is provided.

  According to the present disclosure, it is possible to provide a belt transmission device suitable for an auxiliary machine having various specifications without preparing a plurality of types of belts.

The figure which shows an example of the engine provided with the belt transmission apparatus which concerns on one embodiment of this indication Rear view showing an example of holding unit Side view showing an example of holding unit The figure which shows an example of the belt transmission apparatus by which tension adjustment of the endless belt was performed

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In the present embodiment, the belt transmission device 2 that transmits the power of the engine 1 to a compressor 40 for a refrigerator as an auxiliary device will be described as an example.
A vehicle including a belt transmission device 2 according to an embodiment of the present disclosure will be described with reference to FIG.

  FIG. 1 is a schematic diagram illustrating an example of an engine 1 including a belt transmission device 2. In FIG. 1, the X axis, the Y axis, and the Z axis are drawn. In the following description, the left-right direction in FIG. 1 is referred to as the X direction or the vehicle width direction, the right direction is referred to as “+ X direction” or “vehicle right side”, and the left direction is referred to as “−X direction” or “vehicle left side”. Further, the vertical direction in FIG. 1 is referred to as the Z direction or the vehicle vertical direction, the upward direction is referred to as “+ Z direction” or “vehicle upper side”, and the downward direction is referred to as “−Z direction” or “vehicle lower side”. Further, in FIG. 1, the direction perpendicular to the paper surface is referred to as the Y direction or the vehicle front-rear direction, the front direction is referred to as “+ Y direction” or “vehicle front side”, and the back direction is referred to as “−Y direction” or “vehicle rear side”.

  The configuration of the engine 1 is the same as that of the prior art, and an engine body 13 having a cylinder block 11 and a cylinder head 12, an oil pan 14 provided on the vehicle lower side (−Z direction) of the cylinder block 11, and a cylinder head 12 vehicle. And a head cover 15 provided on the upper side (+ Z direction).

  A crankshaft (not shown) driven by a piston (not shown) is rotatably held at the lower end of the cylinder block 11. The crankshaft (not shown) extends in the vehicle front-rear direction (Y direction).

  The belt transmission device 2 includes a driving pulley 3, a driven pulley 4, an idler pulley 5, an endless belt 6, a tensioner pulley 7, an idler pulley shaft support portion 8, and a holding portion 9 that holds the tensioner pulley.

  The driving pulley 3 is fixed to a vehicle front side end portion of a crankshaft that protrudes from the vehicle front side end surface 11a of the cylinder block 11 to the vehicle front side (+ Y direction).

  The driven pulley 4 has a rotation shaft extending in the vehicle front-rear direction (Y direction), and is disposed on the vehicle left side (−X direction) of the vehicle upper end portion of the vehicle front end surface 11 a of the cylinder block 11. The driven pulley 4 is a pulley in the refrigerator compressor 40. The refrigerator compressor 40 is fixed to the left side (−X direction) of the cylinder block 11 in the vehicle. As described above, the refrigerator compressor 40 has a plurality of types of specifications in which the diameter and the center position of the driven pulley 4 are different from each other.

  Generally, the diameter of the driven pulley 4 and the idler pulley 5 are assumed to be constant, and the diameter of the driven pulley 4 is generally relatively large, or the center position of the driven pulley 4 is the left side of the vehicle ( When arranged in the (−X direction), the entire length of the endless belt 6 becomes longer. On the other hand, when the diameter of the driven pulley 4 is relatively small, or the center position of the driven pulley 4 is arranged on the right side of the vehicle (+ X direction), the total length of the endless belt 6 is shortened.

  Since the change in the total length of the endless belt 6 changes the tension of the endless belt 6 that is wound around the driving pulley 3, the driven pulley 4, and the idler pulley 5, it is necessary to adjust the tension of the endless belt 6. The tension adjustment of the endless belt 6 includes preliminary tension adjustment performed by the shaft support portion 8 and intrinsic tension adjustment performed by the holding portion 9. The details of the preparatory and original tension adjustment will be described later.

  The idler pulley 5 is configured to rotate about the shaft 52. The shaft 52 extends in the vehicle front-rear direction (Y direction). The idler pulley 5 is disposed on the vehicle right side (+ X direction) of the center portion in the vehicle vertical direction on the vehicle front side end surface 11a of the cylinder block 11. The idler pulley 5 is supported on the vehicle front side end surface 11 a via the shaft support portion 8.

  The endless belt 6 travels around the driving pulley 3, the driven pulley 4 and the idler pulley 5.

  The tensioner pulley 7 is disposed on the outer peripheral side of the endless belt 6. The tensioner pulley 7 is configured to be rotatable around a shaft 72. The shaft 72 extends in the vehicle front-rear direction (Y direction). While the tensioner pulley 7 is in contact with the outer peripheral surface of the endless belt 6, the tensioner pulley 7 has an outer periphery between a first position predetermined on the outer peripheral side and a second position predetermined on the inner peripheral side from the first position. It is provided so as to be able to reciprocate in a direction from the side toward the inner peripheral side of the endless belt 6 and a direction from the inner peripheral side toward the outer peripheral side. Here, the outer peripheral side of the endless belt 6 refers to the outside of the region surrounded by the wound endless belt 6, and the inner peripheral side refers to the region side. The direction in which the tensioner pulley 7 reciprocates may be a direction that intersects the traveling direction of the endless belt 6 and is not limited to a direction that is orthogonal to the traveling direction.

  The shaft support 8 selectively supports the shaft 52 of the idler pulley 5 at a plurality of different positions. Specifically, the shaft support portion 8 includes a support bracket 84 having a plurality of mounting holes 82. The support bracket 84 is a flat plate extending in the vehicle width direction (X direction). The vehicle right end 86 of the support bracket 84 is fastened to the fixing bracket 16. The vehicle right end portion 88 of the support bracket 84 is fastened to the vehicle front end surface 11a.

  A plurality (three in this case) of mounting holes 82 are arranged at a predetermined interval from the vehicle width direction central portion 89 of the support bracket 84 to the vehicle right side (+ X direction). Each mounting hole 82 is selectively used according to the specifications of the refrigerator compressor 40. For example, as the mounting hole 82, the mounting hole 82A arranged at the position of the center part 89 in the vehicle width direction according to the specification A of the refrigerator compressor 40 is used (see FIG. 1). The attachment hole 82A is a hole for fastening the shaft 52 and the support bracket 84 to the fixing bracket 16 or the vehicle front side end surface 11a with a bolt when selected to support the shaft 52. Further, the mounting hole 82A is a hole for fastening the support bracket 84 to the fixing bracket 16 or the vehicle front end surface 11a with a bolt when not selected for supporting the shaft 52.

  The shaft support portion 8 is endless when the compressor 40 for a refrigerator having a specification in which the diameter of the driven pulley 4 is relatively small or the driven pulley 4 is positioned on the right side of the vehicle (+ X direction), that is, endless. When the total length of the belt 6 is shorter than a predetermined length, the shaft 52 is supported by using the mounting hole 82A disposed at the position of the vehicle width direction central portion 89. Thereby, since the idler pulley 5 can be relatively separated from the driven pulley 4 side, the endless belt 6 having the same total length as the predetermined length can be used. For this reason, the tension adjustment margin of the endless belt 6 by the tensioner pulley 7 is short, or tension adjustment is not necessary. Here, the “predetermined length” refers to a reference length when attempting to unify the entire length of the endless belt 6.

  On the other hand, the shaft support unit 8 is mounted with a refrigerator compressor 40 having a specification such that the diameter of the driven pulley 4 is relatively large or the driven pulley 4 is positioned on the left side of the vehicle (−X direction). In this case, that is, when the entire length of the endless belt 6 is longer than a predetermined length, the shaft 52 is supported by using the mounting hole 82B disposed at the position of the left end portion 88 of the vehicle. Thereby, since the idler pulley 5 can be made relatively close to the driven pulley 4 side, the endless belt 6 having the same length as the predetermined length can be used. For this reason, the tension adjustment margin of the endless belt 6 by the tensioner pulley 7 is short, or tension adjustment is not necessary.

  As described above, by providing the mounting hole 82 for supporting the shaft 52 according to the specification of the compressor 40 for the refrigerator, the allowance for adjusting the tension of the endless belt 6 is shortened. Tension adjustment can be performed. Following this, the original tension adjustment by the holding unit 9 is performed. Even when the specifications of the compressor 40 for the refrigerator are different when starting the original tension adjustment, the position of the tensioner pulley 7 is unified and the tension adjustment allowance from the unified position is short. In addition, the workability of the original tension adjustment can be improved. Further, when the position of the tensioner pulley 7 at the start of tension adjustment is unified, the tensioner pulley 7 in the holding portion 9 to be mounted on the vehicle front end surface 11a of the engine 1 can be held in the unified position in advance. Become. From this point, the workability of the original tension adjustment can be improved.

  Specifically, the shaft support portion 8 is selected so that the position of the tensioner pulley 7 is the same when the adjustment of the tension of the endless belt 6 is started even when the specifications of the compressor 40 for the refrigerator are different. The shaft 52 of the idler pulley 5 is supported using the mounting holes 82. In other words, each position of the mounting hole 82 is set so that the position of the tensioner pulley 7 at the start of tension adjustment is the same even when the specifications of the auxiliary machines are different. Thereby, the movement range of the tensioner pulley 7 when adjusting the tension of the endless belt 6 can be unified. The “position of the tensioner pulley 7 at the start of tension adjustment” refers to a predetermined position in the movement range of the tensioner pulley 7. Here, for example, a long hole 93 into which the shaft 72 of the tensioner pulley 7 is movably fitted. This is the position of the vehicle upper end portion (described later).

  The holding unit 9 holds the tensioner pulley 7 at any position between the first position and the second position in order to adjust the tension of the endless belt 6.

  Next, the detail of the holding | maintenance part 9 is demonstrated with reference to FIGS. 1-3. FIG. 2 is a rear view showing an example of the holding unit 9. FIG. 3 is a side view showing an example of the holding unit 9. 2 and 3 show the tensioner pulley 7 located on the vehicle upper side (+ Z direction) by a solid line. Further, FIG. 3 shows the tensioner pulley 7 located on the vehicle lower side (−Z direction) by an imaginary line.

  As shown in FIGS. 2 and 3, the holding portion 9 includes a base member 92, a screw member 94 (corresponding to the “screw member” of the present invention), and a retaining member 96.

  As shown in FIG. 2, the base member 92 has a long hole 93 whose longitudinal direction is the vehicle vertical direction (Z direction). The base member 92 has a protrusion 95 protruding at the vehicle upper end (−Y direction) at the vehicle upper end. A shaft 72 is fitted in the elongated hole 93 so as to be movable along the longitudinal direction.

  As shown in FIGS. 2 and 3, the screw member 94 extends in the vehicle vertical direction (Z direction) and is rotatably supported by the protrusion 95. The screw member 94 is screwed onto the shaft 72 of the tensioner pulley 7. The screw member 94, for example, moves the shaft 72 to the vehicle upper side (+ Z direction) when rotated clockwise, and, for example, moves the shaft 72 to the vehicle lower side (rotated counterclockwise). -Z direction). That is, the screw member 94 displaces the tensioner pulley 7 in the vehicle vertical direction (Z direction) by rotating and holds the tensioner pulley 7 at the displaced position by stopping the rotation.

  As shown in FIG. 3, the retaining member 96 is attached to the shaft 72 so as not to drop the shaft 72 from the long hole 93 by sandwiching the side edge portion of the long hole 93 from the vehicle front-rear direction (Y direction). Yes.

<Tension adjustment of endless belt 6>
Next, tension adjustment of the endless belt 6 will be described with reference to FIGS. 1 and 4. FIG. 4 is a diagram illustrating an example of the belt transmission device 2 in which the tension of the endless belt 6 is adjusted. It is assumed that the driving pulley 3, the compressor 40 for the refrigerator, and the support bracket 84 are mounted on the engine 1 in advance. In addition, when the refrigerator compressor 40 mounted on the vehicle has the specification A, the mounting hole 82A located in the vehicle width direction central portion 89 of the support bracket 84 is used (see FIG. 1). In the case of B, the mounting hole 82B located in the vehicle left end 88 of the support bracket 84 is used (see FIG. 4). Further, here, in the holding portion 9, the shaft 72 of the tensioner pulley 7 is at the position of the vehicle upper end portion of the elongated hole 93 (position at the start of tension adjustment).

  As can be seen from FIGS. 1 and 4, the diameter of the driven pulley 4 in the specification B is larger than the diameter of the driven pulley 4 in the specification A. When the compressor 40 for the refrigerator mounted on the vehicle is changed from the specification A to the specification B, the worker or the working robot (hereinafter referred to as a worker or the like) is provided with a mounting hole provided at the position of the left end portion 88 of the vehicle. 82B is used to support the shaft 52 of the idler pulley 5 (prepared tension adjustment).

  Since the diameter of the driven pulley 4 in the specification B is larger than the diameter of the driven pulley 4 in the specification A, the endless belt 6 having an overall length longer than a predetermined length is generally required.

  In the present embodiment, the idler pulley 5 can be made relatively close to the driven pulley 4 side by supporting the shaft 52 using the mounting hole 82B. Thereby, the endless belt 6 which has the full length of the same length as predetermined length can be used.

  Next, an operator or the like hangs the endless belt 6 around the driving pulley 3, the driven pulley 4 and the idler pulley 5. Further, the tensioner pulley is wound around the outer peripheral surface of the endless belt 6.

  Next, the operator or the like rotates the screw member 94 in the clockwise direction or the counterclockwise direction, and moves the shaft 72 of the tensioner pulley 7 to the vehicle lower side (−Z direction), whereby the endless belt. Adjust the tension of 6 (original tension adjustment). This mechanism is a mechanical adjustment mechanism using the screw member 94, but can also be applied to a mechanism (auto tensioner) using a spring.

<Effects of the present embodiment>
As described above, according to the belt transmission device 2 according to the present embodiment, the shaft support portion 8 selectively supports the shaft 52 of the idler pulley 5 at a plurality of positions. Moreover, the holding part 9 positions the tensioner pulley 7 so as to adjust the tension of the endless belt 6. This makes it possible to use the endless belt 6 of the same length even when the specifications of the auxiliary machine are different, so that it is suitable for auxiliary machines of various specifications without preparing multiple types of belts. The belt transmission device 2 can be provided. Further, since the tension adjustment allowance of the endless belt 6 by the tensioner pulley 7 can be made short and uniform, if the tension adjustment allowance by the tensioner pulley becomes long, the maintainability is deteriorated, and the deterioration of the belt is judged. In addition, it is possible to prevent disadvantages and malfunctions in the belt, such as increasing the risk of the belt interfering with other parts.

  According to the belt transmission device 2, even when the specifications of the compressor 40 for the refrigerator are different, the idler pulley is located at a position selected so that the position of the tensioner pulley 7 at the start of tension adjustment of the endless belt 6 is the same. 5 shafts 52 are supported. Thereby, since the movement range of the tensioner pulley 7 can be unified, the holding | maintenance part 9 can be reduced in size.

  In the above embodiment, the shaft support portion 8 has a plurality of (for example, three) mounting holes 82 for selectively supporting the shaft 52 of the idler pulley 5 at a plurality of positions. The present invention is not limited to this. For example, the shaft 52 may be supported so as to be continuously movable by having the same configuration as the holding unit 9. Further, a mark as a target position according to the specifications of the auxiliary machine may be provided along the moving direction of the shaft 52. According to this configuration, the original tension adjustment of the endless belt 6 can be performed not only by the holding portion 9 but also by the shaft support portion 8.

  Moreover, in the said embodiment, although selection of the attachment hole 82 performed according to the specification of the compressor 40 for refrigerators is performed based on a work standard, for example, this invention is not limited to this, For example, an attachment hole It may be performed based on an identification display that can identify the specification, such as a stamp, a seal, or a label provided corresponding to 82.

  In the above embodiment, the driving pulley 3 fixed to the crankshaft of the engine 1 is used as a power source to the auxiliary machine. However, the present invention is not limited to this, and for example, a pulley of an electric motor is used. May be used.

  The belt transmission device 2 of the present disclosure is useful as an auxiliary machine driving device that is required to be suitable for auxiliary machines of various specifications without preparing a plurality of types of belts.

DESCRIPTION OF SYMBOLS 1 Engine 2 Belt transmission device 3 Driving pulley 4 Driven pulley 5 Idler pulley 6 Endless belt 7 Tensioner pulley 8 Shaft support 9 Holding part 11 Cylinder block 12 Cylinder head 13 Engine body 14 Oil pan 15 Head cover 16 Fixing bracket 40 For refrigerator Compressor 52 shaft 72 shaft 82 mounting hole 84 support bracket 86 vehicle right end portion 88 vehicle left end portion 89 vehicle width direction center portion 92 base member 93 slot 94 screw member 96 retaining member

Claims (5)

A driving pulley, a driven pulley and an idler pulley;
An endless belt wound around the driving pulley, the driven pulley and the idler pulley;
A tensioner pulley that is displaceable between different first and second positions while contacting the endless belt;
A shaft support that can support the shaft of the idler pulley at a plurality of different positions;
A holding portion for holding the tensioner pulley at any position between the first position and the second position in order to adjust the tension of the endless belt;
A belt transmission device comprising: Multiple types of auxiliary machines with different specifications,
The belt transmission according to claim 1, wherein the shaft support portion supports the shaft of the idler pulley at a position where the endless belt having the same length is used even when the specifications of the auxiliary machine are different. apparatus.   The shaft support portion supports the shaft of the idler pulley at a position that makes the tensioner pulley position the same when starting the adjustment of the tension of the endless belt even when the specifications of the auxiliary machine are different. The belt transmission device according to claim 2.   The belt transmission device according to any one of claims 1 to 3, wherein the shaft support portion supports a shaft of the idler pulley so as to be continuously movable.   The belt transmission device according to any one of claims 1 to 4, wherein the holding portion includes a screw member for displacing the tensioner pulley.

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