JP5482264B2 - Automatic idling prevention device for vehicle air compressor - Google Patents

Description

  The present invention relates to an automatic idling prevention device for a vehicle air compressor.

  As shown in FIG. 4, the air compressor 1 driven by the drive shaft 40 of the vehicle engine 2 includes a suction valve 12 provided at the suction port 10 and opened only during suction, and a discharge valve provided at the discharge port 11 and opened only during discharge. 14, a piston 7 that reciprocates within the cylinder 5, a crank portion 8 a of the crankshaft 8 that converts the rotational motion of the drive shaft 40 of the engine 2 into the reciprocating motion of the piston 7, and the connecting rod of the piston 7. 9 and a conversion mechanism 6 (see, for example, Patent Document 1).

  When the piston 7 reciprocates inside the cylinder 5 having the suction valve 12 and the discharge valve 14, the suction valve 12 is opened and the air is opened when the volume in the cylinder 5 increases as shown in FIG. Is sucked into the cylinder 5, and when the volume is reduced from this state, the suction valve 12 is closed and the air is compressed. Then, as shown in FIG. 4B, the discharge valve 14 is opened by the pressure of the compressed air, and the compressed air is discharged from the discharge port 11. The compressed air is accumulated in the air tank via the discharge pipe 15, and is used as, for example, a working fluid for remotely operating a brake of the vehicle.

  In order to keep the compressed air at the set pressure, an unload valve 50 driven by the pressure on the air tank side is provided on the suction port 10 side as shown in FIG. 4C, and the pressure in the air tank is set to the set pressure. Exceeds the above, the unloading valve 50 is actuated and the suction valve 12 is forcibly opened, so that the air in the cylinder 5 escapes from the suction port 10 and the compression of the air by the piston 7 is not performed. The compressor runs idle (idle operation), and compressed air cannot be sent into the air tank.

  On the other hand, when the pressure in the air tank and in the discharge pipe from the compressor to the air tank (including the inside of the discharge pipe, hereinafter simply referred to as the air tank) falls below the set pressure, the unload valve 50 is not activated as shown in FIG. As a result, the suction valve 12 is closed, and the compression of air by the piston 7 is resumed.

JP-A-8-105387

  However, since the conventional vehicle air compressor as described above is directly connected to the drive shaft 40 of the engine 2, even if the pressure in the air tank exceeds the set pressure, the piston 7 always reciprocates. Yes. Therefore, the engine has a driving loss. This driving loss corresponds to a maximum of 0.8% of the engine output in a typical vehicle of 10 tons or more, and affects fuel consumption.

  The present invention has been made in consideration of the above circumstances, and is a vehicle air that can automatically shut off the power from the engine and prevent the air compressor from idling when the pressure in the air tank exceeds a set pressure. An object is to provide an automatic idling prevention device for a compressor.

To achieve the above object, the present invention provides a vehicle air compressor driven by a vehicle engine, an air tank that accumulates compressed air discharged from the air compressor via a discharge pipe, and a vehicle engine. A power transmission mechanism having a diaphragm clutch provided between a power take-out portion and an input shaft of the crankshaft of the air compressor , and having a diaphragm clutch for connecting and disconnecting power transmission;
The diaphragm clutch includes an inner ring fitted to the input shaft so as to be movable in the axial direction via a spline, an operation wheel composed of an outer ring supported rotatably with respect to the inner ring, and more than the operation wheel. A frustoconical diaphragm provided on a flange portion of the inner ring protruding toward the engine side, and a power input portion fixed to a peripheral portion of the diaphragm and connected to and disconnected from the power takeout portion;
The power transmission mechanism includes a control cylinder that takes compressed air from the discharge pipe, a control piston that is reciprocally movable in the control cylinder, and the control piston that resists the pressure of the compressed air. The diaphragm type clutch is brought into contact with the spring that is urged at the set pressure by the movement of the control piston by the urging force of the spring, and the diaphragm type clutch is disconnected by the movement of the control piston against the urging force of the spring. And a link mechanism
The link mechanism includes a lever member that is pivotally supported on both side portions of the operation wheel via a projecting shaft, and a base portion that is pivotally supported by a fixed system, and is connected to the lever portion and is used for the control. A connecting link connected to the rod portion of the piston,
When the diaphragm clutch is in contact, the control piston is positioned on the compressor side together with the operation wheel and the inner ring at the connecting link and the lever portion by the spring, and the spring force of the diaphragm And the power input part is in contact with the power take-out part,
When the diaphragm clutch is disengaged, the control piston moves the operation wheel to the engine side via the connecting link and the lever portion against the spring to reverse the diaphragm, and the reversal causes the The power input unit is configured to be separated from the power take-out unit .

  According to the present invention, when the pressure in the air tank exceeds the set pressure, the power from the engine can be automatically shut off to prevent the air compressor from idling.

It is a figure which shows an example of the automatic idling prevention apparatus of the air compressor for vehicles which concerns on embodiment of this invention. It is a figure which shows the A section of FIG. 1 schematically. It is a figure which shows the action | operation / non-operation state of the automatic idling prevention apparatus, (a) is a figure of a non-operation state, (b) is a figure of an operation state. FIGS. 2A and 2B are diagrams showing a conventional air compressor for a vehicle, in which FIG. 1A is a view in which a suction valve is opened, FIG. 2B is a view in which a discharge valve is opened, and FIG. 2C is a view in which an unload valve is activated. It is.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is explained in full detail based on an accompanying drawing.

  In FIG. 1, reference numeral 1 denotes a vehicle air compressor that is driven by a vehicle engine 2, and a power transmission mechanism 3 that constitutes an automatic idling prevention device for the air compressor 1 is provided between the air compressor 1 and the engine 2. It has been. The engine 2 has a power take-out portion 4 that is directly connected to the crankshaft or indirectly through a gear mechanism or the like.

  The air compressor 1 includes an air compressor main body 1 a having a cylinder 5 and a conversion mechanism chamber 6, a piston 7 slidably inserted into the cylinder 5, and a rotary motion converted into a reciprocating motion of the piston 7. A crankshaft 8 rotatably supported in the conversion mechanism chamber 6 and a connecting rod 9 connecting the crank portion 8a of the crankshaft 8 and the piston 7 are provided. One end of the crankshaft 8 is an input shaft 8b. The head portion of the cylinder 5 is provided with a suction port 10 for sucking air into the cylinder 5 and a discharge port 11 for discharging compressed air compressed by the piston 7.

  A suction pipe 13 is connected to the suction port 10 via a suction valve 12 that opens only during suction. The suction pipe 13 is opened to the atmosphere via an air filter (not shown). A discharge pipe 15 is connected to the discharge port 11 via a discharge valve 14 that opens only during discharge. The discharge pipe 15 is connected to an air tank 16.

  A power transmission mechanism 3 having a clutch 17 for connecting and disconnecting power transmission is provided between the power take-out portion 4 of the engine 2 and the input shaft 8 b of the air compressor 1, and the power transmission mechanism 3 includes the air tank 16. When the internal pressure is equal to or lower than the set pressure, the clutch 17 is engaged, and when the set pressure is exceeded, the clutch 17 is disengaged.

  More specifically, the power transmission mechanism 3 includes a control cylinder 19 for taking compressed air from the discharge pipe 15 through the branch pipe 18 and a control provided in the control cylinder 19 so as to be reciprocally movable. FIG. 3A shows the piston 20 for control, the spring 21 that urges the control piston 20 at a set pressure against the pressure of the compressed air, and the movement of the control piston 20 by the urging force of the spring 21. And a link mechanism 22 for disengaging the clutch 17 as shown in FIG. 3B by moving the control piston 20 against the biasing force of the spring 21 as shown in FIG. Yes.

  The clutch 17 is preferably a well-known diaphragm clutch that presses (contacts) or separates (disconnects) the power input unit 24 with respect to the power extraction unit 4 by the spring force of the diaphragm 23, for example. The diaphragm clutch of the present embodiment includes an inner ring 26 fitted to the input shaft 8b of the crankshaft 8 so as to be movable in the axial direction via a spline 25, as schematically shown in FIG. An operation wheel 28 composed of an outer ring rotatably supported via a ball bearing 27, and a frustoconical diaphragm 23 is provided on a flange portion 26a of the inner ring 26 protruding from the operation wheel 28 toward the engine 2 side. The peripheral edge portion of the diaphragm 23 is fixed to the inner peripheral edge portion of the cylindrical portion 24a of the bottomed cylindrical power input portion 24.

  In order to operate this diaphragm clutch, a lever member 30 is pivotally supported on both sides of the operation wheel 28 via a projecting shaft 29, and a base portion of the lever member 30 is pivoted to a fixed portion 31 via a pivot 32. The rod portion 20 a of the control piston 20 is connected to the other end of the lever member 30 via a connection link 33.

  Here, the movement of the diaphragm clutch will be described. When the pressure of the compressed air introduced into the control cylinder 19 through the branch pipe 18 is lower than the set pressure, the control is performed as shown in FIG. Since the piston 20 is biased upward by the spring 21, the operation wheel 28 is moved to the air compressor 1 side via the connecting link 33 and the lever member 30, and the diaphragm 23 projects to the air compressor 1 side. Yes. The power input unit 24 is pressed against the power take-out unit 4 by the pressing force of the diaphragm 23, and the clutch 17 is in a contact state.

  On the other hand, when the pressure of the compressed air exceeds the set pressure, the control piston 20 in the control cylinder 19 is moved downward against the spring 21 as shown in FIG. The operation wheel 28 is moved to the engine 2 side via the link 33 and the lever member 30, and accordingly, the diaphragm 23 is inverted and protrudes to the engine 2 side. Due to the reversal of the diaphragm 23, the power input unit 24 is moved to the air compressor 1 side and is separated from the power take-out unit 4, so that the clutch 17 is disconnected.

  When the pressure of the compressed air falls below the set pressure from this state, the control piston 20 in the control cylinder 19 is moved upward by the spring 21 and the operation wheel 28 is moved to the air compressor 1 side. On the other hand, since the power input unit 24 abuts on the support shaft 32 and cannot move to the air compressor 1 side, only the diaphragm 23 is reversed and protrudes to the air compressor 1 side, and the pressing force of the diaphragm 23 causes the FIG. ), The power input unit 24 is pressed by the power take-out unit 4, and the clutch 17 is in a contact state.

  Thus, according to the automatic idling prevention device for a vehicle air compressor of this embodiment, the vehicle air compressor 1 driven by the vehicle engine 2 and the compressed air discharged from the air compressor 1 are discharged to the discharge pipe 15. An air tank 16 for accumulating pressure, and a power transmission mechanism 3 having a clutch 17 provided between the power take-out portion 4 of the vehicle engine 2 and the input shaft 8b of the air conditioner bracer 1 for connecting and disconnecting power transmission. The power transmission mechanism 3 is configured to engage the clutch 17 when the pressure in the air tank 16 is equal to or lower than a set pressure, and to disengage the clutch 17 when the pressure exceeds the set pressure. When the pressure in the air tank 16 exceeds the set pressure, the power from the engine 2 is automatically shut off to prevent the air compressor 1 from idling. It can be. As a result, engine drive loss can be suppressed, and fuel consumption can be improved.

  The power transmission mechanism 3 includes a control cylinder 19 that takes compressed air from the discharge pipe 15, a control piston 20 that can be reciprocated in the control cylinder 19, and the control piston 20. Control that resists the urging force of the spring 21 by bringing the clutch 17 into contact with the spring 21 that urges at a set pressure against the pressure of the compressed air and the movement of the control piston 20 by the urging force of the spring 21 Since the link mechanism 22 for disengaging the clutch 17 by the movement of the piston 20 is provided, the clutch 17 can be reliably connected and disconnected with a simple configuration.

  Since the clutch 17 is a diaphragm clutch that presses or separates the power input portion 24 from the power take-out portion 4 by the spring force of the diaphragm 23, the structure can be simplified and the cost can be reduced.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist of the present invention. . For example, the power transmission mechanism may be configured such that the pressure in the air tank is detected by a pressure sensor, and the control device connects and disconnects the clutch via the drive device based on the detection signal.

DESCRIPTION OF SYMBOLS 1 Air compressor 2 Engine 3 Power transmission mechanism 4 Power extraction part 15 Discharge pipe 16 Air tank 17 Clutch 19 Control cylinder 20 Control piston 21 Spring 22 Link mechanism 23 Diaphragm

Claims (1)

A vehicle air compressor driven by a vehicle engine, an air tank that accumulates compressed air discharged from the air compressor via a discharge pipe, a power take-out portion of the vehicle engine, and an input of a crankshaft of the air compressor A power transmission mechanism having a diaphragm clutch provided between the shaft and connecting / disconnecting power transmission;
The diaphragm clutch includes an inner ring fitted to the input shaft so as to be movable in the axial direction via a spline, an operation wheel composed of an outer ring supported rotatably with respect to the inner ring, and more than the operation wheel. A frustoconical diaphragm provided on a flange portion of the inner ring protruding toward the engine side, and a power input portion fixed to a peripheral portion of the diaphragm and connected to and disconnected from the power takeout portion;
The power transmission mechanism includes a control cylinder that takes compressed air from the discharge pipe, a control piston that is reciprocally movable in the control cylinder, and the control piston that resists the pressure of the compressed air. The diaphragm type clutch is brought into contact with the spring that is urged at the set pressure by the movement of the control piston by the urging force of the spring, and the diaphragm type clutch is disconnected by the movement of the control piston against the urging force of the spring. And a link mechanism
The link mechanism includes a lever member that is pivotally supported on both side portions of the operation wheel via a projecting shaft, and a base portion that is pivotally supported by a fixed system, and is connected to the lever portion and is used for the control. A connecting link connected to the rod portion of the piston,
When the diaphragm clutch is in contact, the control piston is positioned on the compressor side together with the operation wheel and the inner ring at the connecting link and the lever portion by the spring, and the spring force of the diaphragm And the power input part is in contact with the power take-out part,
When the diaphragm clutch is disengaged, the control piston moves the operation wheel to the engine side via the connecting link and the lever portion against the spring to reverse the diaphragm, and the reversal causes the An automatic idling prevention device for a vehicle air compressor, wherein a power input unit is configured to be separated from the power take-out unit .

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