KR20060009067A - Variable displacement swash plate type compressor - Google Patents

Abstract

The present invention relates to a variable displacement swash plate compressor,

A cylinder block having a plurality of cylinder bores, a front housing disposed at the front end of the cylinder block to form a swash plate chamber, a drive shaft rotatably supported by the cylinder block, and a swash chamber of the front housing. A lug plate fixed to the drive shaft, a suction chamber and a discharge chamber communicating with the cylinder bore therein, and a rear housing disposed at the rear end of the cylinder block, and driven and guided by the lug plate. A swash plate coupled to change an inclination angle with respect to the swash plate, a spring supported between the lug plate and the swash plate, a piston coupled to the swash plate to be slidable and reciprocally accommodated in the cylinder bore, and the swash plate Including a sleeve between the drive shaft coupling inner surface and the drive shaft of the In that variable displacement swash plate type compressor,

The drive shaft coupling inner surface 153 of the swash plate 150 is composed of a front enlargement hole 153a, a middle reduction hole 153b, and a rear enlargement hole 153c, and can be axially moved to the drive shaft 140. It is composed of a ring portion 310 that is fitted to be secured, and a portion of the ring portion 310 extends in the axial direction, the tongue portion 320 interposed between the drive shaft coupling inner surface 153 and the drive shaft 140, Since the tongue 320 is characterized in that the concave groove 321 is formed to be coupled to the intermediate reduction hole (153b),

Since the sleeve 300 prevents direct slippage of the swash plate and the drive shaft to minimize wear and can support the swash plate stably, the sleeve 300 smoothly adjusts the inclination angle corresponding to the pressure difference between the pressure in the swash plate chamber and the pressure in the cylinder bore. It can be made, the advantage that the variable capacity control is very easy.

Description

Variable Displacement Swash Plate Type Compressor

1 is a longitudinal sectional view showing a variable displacement swash plate compressor having a conventional sleeve.

FIG. 2 is a schematic cross-sectional view showing the configuration in which the sleeve is interposed between the drive shaft and the swash plate in FIG. 1, and FIG. 2A shows the arrangement structure of the minimum inclination angle and FIG. 2B the maximum inclination angle.

Figure 3 is a longitudinal sectional view showing a variable displacement swash plate compressor having a sleeve according to the present invention, Figure 3a shows the arrangement of the minimum inclination angle, Figure 3b is the maximum inclination angle.

FIG. 4 is a perspective view showing a main part around the swash plate in FIG. 3, FIG. 4A is a front perspective view, and FIG. 4B is a rear perspective view.

FIG. 5 is an exploded perspective view showing a main part around the swash plate in FIG. 3.

(A), (b), (c) is a perspective view which shows the structure of a sleeve in FIG.

FIG. 7 is a schematic cross-sectional view showing a configuration in which the sleeve is interposed between the drive shaft and the swash plate in FIG. 3, and FIG. 7A shows the arrangement structure of the minimum inclination angle and FIG. 7B the maximum inclination angle.

※ Explanation of Major Drawings

110: cylinder block

120: front housing

130: rear housing

140: drive shaft

150: swash plate

153: drive shaft coupling inner surface

160: sliding pin

170: spring

180: lug plate for power transmission

200: piston

201: shoe

300: sleeve

1000: Swash Plate Compressor

The present invention relates to a variable displacement swash plate compressor, and more particularly to a variable displacement swash plate compressor that can be stably supported without direct sliding to the drive shaft of the swash plate.

In general, the swash plate type compressor, which is widely used as a compressor of a vehicle air conditioner, has a disk-shaped swash plate fixedly mounted on a shaft on a drive shaft that receives engine power, and moves relative to the swash plate by the rotation of the swash plate. The plurality of pistons installed in this way is configured to suck, compress and discharge the refrigerant gas by linearly reciprocating the inside of the plurality of cylinder bores formed in the cylinder block.

In the conventional control method of the compressor against heat load fluctuations, when the clutch which transmits power from the engine to the compressor is turned on / off, the momentary torque is increased in the engine, causing the engine to be overwhelming and riding comfort. This fall occurred and precise temperature control of the car interior was impossible.

In order to solve this problem, in recent years, the inclination angle of the swash plate is changed in accordance with the change of the heat load to achieve precise temperature control by controlling the feed amount of the piston, and at the same time, the inclination angle is continuously changed to abruptly change the torque of the engine by the compressor. A variable displacement swash plate type compressor has been proposed which can improve the riding comfort of a vehicle by reducing it.

1 and 2 show a typical structure thereof, which is a view of the "capacitance variable swash plate compressor with swash plate support means" disclosed in Korean Laid-Open Patent Publication No. 1999-0007811. Hereinafter, the specific structure of the conventional variable displacement swash plate type compressor will be described in more detail.

The conventional variable displacement swash plate type compressor includes a cylinder block (1) having a plurality of cylinder bores (8) formed parallel to the inner circumferential surface and a front housing (2) hermetically coupled to the front of the cylinder block (1). ) And a rear housing 3 which is hermetically coupled via a valve plate 4 at the rear of the cylinder block 1.

A swash plate chamber 5 is provided inside the front housing 2, and one end of the drive shaft 6 is rotatably supported near the center of the front housing 2, while the other end of the drive shaft 6 It passes through the swash plate chamber 5 and is supported through the bearing 7b provided in the cylinder block 1.

In addition, a lug plate 10 and a swash plate 11 are installed on the drive shaft 6, and the swash plate 11 is elastically supported with respect to the lug plate 10 between the lug plate 10 and the swash plate 11. Spring 12 for intervening is interposed.

In the lug plate 10, a pair of power transmission support arms 17 having linearly perforated guide holes 17a respectively formed at the center thereof are formed to protrude integrally on one surface thereof, and one surface of the swash plate 11 has a ball. 16a is formed, and as the lug plate 10 rotates, the ball 16a of the swash plate 11 slides in the guide hole 17a of the lug plate 10, thereby The inclination angle is variable.

In addition, the outer circumferential surface of the swash plate 11 is fitted to the respective pistons 9 via the shoe 14 so as to be slidable.

Thus, as the swash plate 11 is rotated in an inclined state, the pistons 9 inserted through the shoe 14 on the outer circumferential surface thereof are reciprocated in each cylinder bore 8 of the cylinder block 1. do.

In addition, a suction chamber 30 and a discharge chamber 31 are respectively formed in the rear housing 3, and each cylinder bore is provided in the valve plate 4 interposed between the rear housing 3 and the cylinder block 1. A suction port 32 and a discharge port 33 are respectively formed in a position corresponding to (8).

In the conventional variable displacement swash plate type compressor thus constructed, as shown in FIGS. 1 and 2, the inclination angle of the swash plate 11 corresponds to the pressure difference between the pressure in the swash plate chamber 5 and the pressure in the cylinder bore 8. By this adjustment, the conveyance distance of the piston 9 connected to the swash plate 11 is changed by the change of the inclination angle of the swash plate 11, so that the discharge capacity of the compressor is variable.

On the other hand, the movement of the swash plate 11 is limited by the snap ring 13 at the minimum inclination angle of Fig. 2 (a).

In addition, a cylindrical sleeve 18 is interposed between the swash plate 11 and the drive shaft engaging inner surface 20 of the drive shaft 6 to prevent wear due to sliding contact between the swash plate 11 and the drive shaft 6. It is.

However, according to the conventional sleeve 18 structure, since the drive shaft engaging inner surface 20 of the swash plate 11 only contacts the cylindrical surface of the sleeve 18 instead of the drive shaft 6, the swash plate on the sleeve 18 surface. Since the contact point of (11) is difficult to maintain constant, it is easy to slip every minute, and thus, piece wear occurs on the swash plate by the relative movement of the swash plate 11 and the sleeve 18, thereby providing a cause of swash plate abnormal behavior when used for a long time. There was a problem.

In the conventional variable swash plate type compressor, when the swash plate 11 changes the inclination angle of the drive shaft 6, the guide hole 17a in which the ball 16a is linearly processed on the support arm 17 of the lug plate 10 is provided. Since there is a problem that excessive friction occurs in the inner circumferential surface of the guide hole (17a) is not possible to easily control the inclination angle.

The present invention has been made to solve the above problems, the object of the invention is to prevent the direct contact between the drive shaft and the swash plate to prevent the wear of the swash plate to reduce the abnormal behavior of the swash plate even for long time use variable displacement swash plate To provide a compressor.

Another object of the present invention, the variable capacity type that can prevent the sudden change of the inclination angle of the swash plate by smoothing the behavior of the swash plate by the pressure difference in the swash plate chamber and the pressure in the cylinder bore by preventing excessive friction between the lug plate and the swash plate It is to provide a swash plate compressor.

In order to achieve the above object, the variable displacement swash plate compressor according to the present invention,

A cylinder block having a plurality of cylinder bores, a front housing disposed at a front end of the cylinder block to form a swash plate chamber, a drive shaft rotatably supported by the cylinder block and the front housing, and a swash plate of the front housing. Lug plate fixed to the drive shaft in the chamber, a suction chamber and a discharge chamber communicating with the cylinder bore are formed therein and a rear housing disposed at the rear end of the cylinder block, and driven and guided by the lug plate. And a swash plate coupled to the drive shaft so as to vary an inclination angle, a spring supported between the lug plate and the swash plate, a piston coupled to the swash plate to be slidable and reciprocally accommodated in the cylinder bore. Sleeve between the drive shaft coupling inner surface and the drive shaft of the swash plate In the variable displacement swash plate compressor comprising a,

The drive shaft coupling inner surface of the swash plate is composed of a front expansion hole, a middle reduction hole, and a rear expansion hole,

The sleeve is composed of a tongue interposed partially between the drive shaft engaging inner surface and the drive shaft, the predetermined length is extended in the axial direction, the outer surface is characterized in that the concave groove is formed to be coupled to the intermediate reduction hole.

In addition, the variable displacement swash plate compressor according to the present invention,

A cylinder block having a plurality of cylinder bores, a front housing disposed at a front end of the cylinder block to form a swash plate chamber, a drive shaft rotatably supported by the cylinder block and the front housing, and a swash plate of the front housing. Lug plate fixed to the drive shaft in the chamber, a suction chamber and a discharge chamber communicating with the cylinder bore are formed therein and a rear housing disposed at the rear end of the cylinder block, and driven and guided by the lug plate. And a swash plate coupled to the drive shaft so as to vary an inclination angle, a spring supported between the lug plate and the swash plate, a piston coupled to the swash plate to be slidable and reciprocally accommodated in the cylinder bore. Sleeve between the drive shaft coupling inner surface and the drive shaft of the swash plate In the variable displacement swash plate type compressor which comprises,

The sleeve is composed of a ring portion which is axially movable to the drive shaft, and a tongue part interposed between the drive shaft coupling inner surface and the drive shaft with a portion of the ring portion extending in the axial direction. The tongue is characterized in that the concave groove is formed so as to couple to the intermediate narrowing hole.

The tongue of the sleeve is preferably located between the lower side of the drive shaft and the drive shaft engaging inner surface.

Moreover, it is preferable that the said swash plate is provided with the slide protrusion part in which the sliding pin was provided.

In addition, the lug plate is preferably composed of a contact projection formed with an inclined surface to guide the sliding pin, and a power transmission piece formed to protrude on one of the outer surfaces of the contact projection.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 to 7, the configuration of the variable displacement swash plate compressor according to the present embodiment is shown.

As shown, the variable displacement swash plate compressor 1000 has a plurality of cylinder bores 110a formed in parallel in the longitudinal direction on an inner circumferential surface thereof and constitutes the outside of the compressor, and the cylinder block. A front housing 120 disposed at a front end of the 110 to form a swash plate chamber, a drive shaft 140 rotatably supported by the cylinder block 110, and a swash chamber of the front housing 120. Lug plate 180 is fixed to the drive shaft 140 and the suction chamber 132 and the discharge chamber 133 is formed in the rear housing 130 is disposed at the rear end of the cylinder block 110 ), A swash plate 150 that is rotated and guided by the lug plate 180 and is coupled to change the inclination angle with respect to the drive shaft 140 and is formed in a circular plate shape, and the lug plate 180 and the swash plate ( 150) support between It is configured to include a piston 170, the piston 200 is slidably coupled to the swash plate 150 via the shoe 201, the reciprocating movement is accommodated in the cylinder bore (110a) have.

In the rear housing 130, the suction chamber 132 and the discharge chamber 133 are formed, respectively, the valve plate 131, the inlet 131a for communicating the cylinder bore 110a and the suction chamber 132, and Discharge ports 131b for communicating the cylinder bore 110a and the discharge chamber 133 are formed.

In addition, the suction port 131a and the discharge port 131b formed in the valve plate 131 may be suctioned to open and close the suction port 131a and the discharge port 131b by a pressure change caused by the reciprocating motion of the piston 180. A valve 134 and a discharge valve 135 are respectively provided.

Since other configurations are the same as the prior art described above, description of overlapping portions will be omitted.

On the other hand, the drive shaft coupling inner surface 153 of the swash plate 150 to be coupled to the drive shaft 140 is composed of a front expansion hole (153a), a middle reduction hole (153b), and a rear expansion hole (153c). In addition, a sleeve 300 is interposed between the driving shaft 140 and the driving shaft coupling inner surface 153 to support the driving shaft 140. Accordingly, the inclination angle of the swash plate 150 with respect to the drive shaft 140 is changed stably. Referring to the coupling configuration of the swash plate 150 and the drive shaft 140 in more detail as follows.

As shown in FIG. 6, the sleeve 300 has a structure in which the ring portion 310 and the tongue portion 320 are integrally formed. The ring portion 310 is a portion that is axially movable to the drive shaft 140, the tongue portion 320 formed by extending a portion of the ring portion 310 in the axial direction is the drive shaft coupling inner surface 153 And a portion interposed between the lower side of the drive shaft 140. This is the part where wear actually occurs the most. The tongue 320 has a concave groove 321 is formed along the circumferential direction to be coupled to the intermediate reduction hole (153b).

In addition, the angle between the concave groove 321 of the tongue portion 320, as shown in Figure 7, it is necessary to be larger than the angle of the intermediate reduction hole 153b in contact with the concave groove 320. This is essential for the swash plate 180 to move while changing the inclination angle.

Here, the front enlarged hole 153a, the intermediate reduced hole 153b, and the rear enlarged hole 153c of the drive shaft coupling inner surface 153 and the concave groove 321 of the sleeve 300 may be formed of a smooth curved surface. have.

In addition, the spring 170 may be disposed between the rear surface of the lug plate 180 and the front surface of the ring portion 310 of the sleeve 300.

On the other hand, the sleeve 300 may be composed of only the tongue 320. In addition, the ring portion 310 of the sleeve 300 may be disposed at the rear side. In this case, the spring 170 will not be supported at the ring portion 310.

According to the structure and arrangement of the sleeve 300 described above, the swash plate 150 may be smoothly changed from the minimum inclination angle to the maximum inclination angle while moving the driving shaft 140. In this operation, the driving shaft coupling inner surface of the swash plate 150 is always used ( Since the 153 moves about the concave groove 321 of the sleeve 300, more stable support is achieved.

On the other hand, the sliding projection 152 formed in the swash plate 150 is provided with a sliding pin 160 through the through hole (152b) forcibly fitted or loosely fitted. And, the rear portion of the lug plate 180 is composed of a contact projection 182, the inclined surface 182a is formed, and a power transmission piece 184 formed to protrude on the outer surface of any one of the contact projections 182. have. Accordingly, the sliding pin 160 may smoothly move along the inclined surface 182a of the contact protrusion 182 during the inclined movement of the swash plate 150. When the driving shaft 140 rotates, the protrusion 152 of the swash plate 150 abuts against the power transmission piece 184 of the lug plate 180 to rotate together. The inclined surface 182a may be straight or curved.

Instead of the structure of the sliding pin 160 and the inclined surface 182a described above, the sleeve 300 according to the present invention may be guided by a ball 16a inserted into the guide hole 17a as in the related art. Of course, the effect can be obtained as it is.

The operation according to the present embodiment is described below.

3 to 7, in the variable displacement swash plate type compressor according to the present invention, when the driving shaft 140 rotates, the swash plate 150 is a contact protrusion 182 of the power transmission lug plate 180. And by receiving the rotational force through the slide projection 152 by the power transmission transmission piece 184 is to make a rotary motion.

At this time, when the swash plate 150 is inclined by the pressure difference between the pressure of the swash plate chamber 120a and the pressure in the cylinder bore, interposed between the lower side of the drive shaft 140 and the drive shaft coupling inner surface 153 of the swash plate 150. The inclined angle change of the swash plate 150 is made smooth and stable through the sleeve (300).

At the same time, the swash plate 150 allows the sliding pin 160 installed on the slide protrusion 152 to move along the inclined surface 182a formed on the front surface of the contact protrusion 182 of the power transmission lug plate 180. Thus, it is possible to move while greatly reducing the friction loss.

The foregoing drawings and embodiments merely illustrate the most preferred examples of the invention, and there may be various changes, modifications, or applications by those skilled in the art within the spirit and scope described in the appended claims. Typically, the front enlargement hole 153a, the intermediate reduction hole 153b, and the rear enlargement hole 153c of the drive shaft coupling inner surface 153 and the concave groove 321 of the sleeve 300 may be formed to have a smooth curved surface. Can be.

According to the present invention having the configuration described above, there is an advantage that the wear of the swash plate and the drive shaft can be minimized because the drive shaft and the swash plate are coupled through the sleeve.

In addition, the direct sliding of the swash plate with respect to the drive shaft by the specific sleeve structure can be prevented and stably supported, thereby smoothly adjusting the inclination angle corresponding to the pressure difference between the pressure in the swash plate chamber and the pressure in the cylinder bore. As a result, the engine has no problems even with sudden torque changes, and the riding comfort is good.

In addition, by having the sliding pin installed on the slide projection of the swash plate to move along the inclined surface formed on the contact projection of the power transmission lug plate, there is also an advantage that can prevent the excessive friction to facilitate the inclined movement of the swash plate.

Claims (5)

A cylinder block having a plurality of cylinder bores, a front housing disposed at the front end of the cylinder block to form a swash plate chamber, a drive shaft rotatably supported by the cylinder block, and a swash chamber of the front housing. A lug plate fixed to the drive shaft, a suction chamber and a discharge chamber communicating with the cylinder bore therein, and a rear housing disposed at the rear end of the cylinder block, and driven and guided by the lug plate. A swash plate coupled to change an inclination angle with respect to the swash plate, a spring supported between the lug plate and the swash plate, a piston coupled to the swash plate to be slidable and reciprocally accommodated in the cylinder bore, and the swash plate Including a sleeve between the drive shaft coupling inner surface and the drive shaft of the In that variable displacement swash plate type compressor, The drive shaft coupling inner surface 153 of the swash plate 150 is composed of a front expansion hole (153a), a middle reduction hole (153b), and a rear expansion hole (153c), Sleeve 300 is composed of a tongue portion 320 interposed between the drive shaft coupling inner surface 153 and the drive shaft 140, the predetermined length is extended in the axial direction, the outer surface in the intermediate reduction hole (153b) A variable displacement swash plate compressor characterized in that the concave groove 321 is formed to be coupled. A cylinder block having a plurality of cylinder bores, a front housing disposed at a front end of the cylinder block to form a swash plate chamber, a drive shaft rotatably supported by the cylinder block, and a swash chamber of the front housing. A lug plate fixed to the drive shaft, a suction chamber and a discharge chamber communicating with the cylinder bore therein, a rear housing disposed at the rear end of the cylinder block, and driven and guided by the lug plate. A swash plate coupled to change the inclination angle with respect to the swash plate, a spring supported between the lug plate and the swash plate, a piston coupled to the swash plate to be slidably coupled to the cylinder bore so as to be reciprocated, and Including a sleeve between the drive shaft engaging inner surface of the swash plate and the drive shaft In a variable displacement swash plate compressor, The drive shaft coupling inner surface 153 of the swash plate 150 is composed of a front expansion hole (153a), a middle reduction hole (153b), and a rear expansion hole (153c), The sleeve 300 includes a ring portion 310 that is fitted to the drive shaft 140 so as to be axially movable, and a portion of the ring portion 310 extends in the axial direction so that the drive shaft coupling inner surface 153 may be formed. The tongue portion 320 is interposed between the drive shaft 140, the tongue portion 320 is a variable displacement swash plate type compressor characterized in that the concave groove 321 is formed to be coupled to the intermediate reduction hole (153b). . The method according to claim 1 or 2, Tongue 320 of the sleeve 300 is variable displacement swash plate type compressor, characterized in that located between the lower side of the drive shaft 140 and the drive shaft coupling inner surface (153). The method of claim 3, The swash plate (150), variable displacement swash plate type compressor, characterized in that the sliding projection 152 is provided with a sliding pin 160 is provided. The method of claim 4, wherein The lug plate 180, the power transmission is formed to project to the outer surface of any one of the contact projections 182, the inclined surface 182a is formed to guide the sliding pin 160, and the contact projections 182. A variable displacement swash plate compressor, characterized in that composed of a piece (184).

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