KR20130025094A - Variable displacement swash plate type compressor - Google Patents

Abstract

PURPOSE: A variable capacity swash plate type compressor is provided to reduce the manufacturing costs and to simplify a structure by separating a torque transferring member, which transfers the rotational force of a driving shaft, from a compressive support member supporting pressure in which the differential pressure between a crank case and a cylinder bore is transferred to a swash plate. CONSTITUTION: A variable capacity swash plate type compressor comprises a housing unit, a cylinder block, a driving shaft(120), a lug plate(130), a torque transferring member(300), a swash plate(140), a swash plate supporting member(400), and a piston. A plurality of cylinder bores is formed in the cylinder block. The driving shaft is rotatably supported in the housing unit or in the cylinder block. The lug plate is fixed to the driving shaft. The torque transferring member is fixed to the driving shaft. The swash plate is installed with a variable angle by operating the rotation of the driving shaft and the torque transferring member. The swash plate is installed in the driving shaft in order to support the swash plate in a rearward motion of the swash plate. The piston is accommodated to allow a reciprocating sliding of the piston in the cylinder bore by the rotation of the swash plate.

Description

Variable Displacement Swash Plate Type Compressor

The present invention relates to a variable displacement swash plate type compressor, and in particular, a variable torque type that separates a torque transmission member for transmitting rotational power of a drive shaft and a compression support member for supporting a pressure in which a differential pressure between a crank chamber and a cylinder bore is transferred to a swash plate. It relates to a swash plate compressor.

In general, the swash plate type compressor, which is widely used as a compressor of an automotive air conditioner, is provided with a disk-shaped swash plate having a predetermined inclination angle on a drive shaft receiving engine power, rotated by a drive shaft, and the circumference of the swash plate by the rotation of the swash plate. The plurality of pistons connected through the shoe (shoe) is configured to suck, compress and discharge the refrigerant gas by linear reciprocating motion inside the plurality of cylinder bores formed in the cylinder block.

In particular, in recent years, the inclination angle of the swash plate is changed according to the change of the heat load to achieve precise temperature control by controlling the feed amount of the piston, and the inclination angle is continuously changed to reduce the sudden torque fluctuation of the engine by the compressor, thereby making the vehicle comfortable to ride. A variable-capacity swash plate type compressor capable of improving the efficiency has been proposed.

A typical example of a variable displacement swash plate type compressor is disclosed in Korean Laid-Open Patent Publication No. 1999-0007811 (hereinafter, referred to as a 'prior art'), and a configuration thereof will be described below with reference to FIG. 1.

As shown, the variable displacement swash plate compressor according to the prior art has a cylinder block (1) having a plurality of cylinder bores (8) formed parallel to the inner peripheral surface in the longitudinal direction, and in front of the cylinder block (1) The front housing 2 is hermetically coupled and the rear housing 3 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 by a bearing 7a near the center of the front housing 2, while the drive shaft ( The other end of 6) passes through the swash plate chamber 5 and is supported via a 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 piston (9) through the shoe 14 so as to be able to slide.

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, the inclination angle of the swash plate 11 is changed by adjusting the inclination angle of the swash plate 11 in response to the pressure difference between the pressure in the swash plate chamber 5 and the pressure in the cylinder bore 8. As a result, the conveying distance of the piston 9 connected to the swash plate 11 is changed to vary the discharge capacity of the compressor.

As described above, according to the related art, torque is transmitted through the ball 16a formed on the swash plate 11, and both sides of the swash plate 11 support the compressive force by the piston 9. That is, the swash plate 11 simultaneously performs the role of torque transmission for transmitting the rotational power of the drive shaft and compression support for supporting the pressure transmitted between the crank chamber and the cylinder bore to the swash plate.

However, according to the related art, the structure of the swash plate 11 has a disadvantage in that the manufacturing cost is high, and the swash plate 11 is severely centered around the drive shaft 6, so that the durability is greatly reduced by vibration and fatigue load. There was this.

The present invention has been made to solve the above-mentioned problems of the prior art, the object of the present invention is to simplify the structure by separating the torque transmission member and the compression support member, through which the variable capacity swash plate type can greatly reduce the manufacturing cost To provide a compressor.

In addition, an object of the present invention is to provide a variable displacement swash plate type compressor that can greatly reduce the eccentricity of the swash plate relative to the drive shaft to increase the durability.

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

housing;

A cylinder block in which a plurality of cylinder bores are formed;

A drive shaft rotatably supported by the housing or cylinder block;

A lug plate fixed to the drive shaft;

A torque transmission member fixed to the drive shaft;

A swash plate installed to change an inclination angle while rotating in association with a rotational motion of the drive shaft and the torque transmission member;

A swash plate support member installed on the drive shaft to support the swash plate at the rear of the swash plate; And

It is characterized in that it comprises a piston which is accommodated reciprocating in the cylinder bore by the rotation of the swash plate.

The swash plate is formed so that the insertion hole through which the drive shaft and the torque transmission member are inserted to be moved relative to each other, a portion of the torque transmission member and a portion of the insertion hole is slidably coupled to each other.

In the torque transfer member, at least a portion of the insertion hole and the relative slide movement has a plate shape.

The drive shaft is formed so that the coupling hole extending in the longitudinal direction, the torque transmission member is inserted into the coupling hole is characterized in that it is fixed in a state protruding from the side of the drive shaft.

The first inclined surface and the first inclined surface respectively inclined in a direction away from the drive shaft from the front to the rear so as to contact each other at the minimum inclination angle of the swash plate to a part of one side surface protruding from the drive shaft of the torque transmission member. 2 slopes are formed,

On the other side surface portion of the insertion hole, a third inclined surface inclined in a direction approaching toward the drive shaft from the front to the rear to contact with the other side projecting from the drive shaft of the torque transmission member at the maximum inclination angle of the swash plate It is characterized by.

The front surface of the swash plate is formed with a compression support arm protruding toward the lug plate, the rear surface of the lug plate is in contact with the compression support arm and the fourth inclined surface inclined from the rear to the front in the radial direction of the lug plate It is characterized by being formed.

The tip of the compression support arm is characterized by consisting of a curved surface convex toward the front.

The front surface of the swash plate is formed with a stopper protruding toward the lug plate on the opposite side of the compression support arm around the drive shaft, characterized in that in contact with the back of the lug plate at the maximum inclination angle of the swash plate.

The swash plate supporting member may include a snap ring fixed to the driving shaft at the rear of the swash plate, and a compression spring disposed between the rear surface of the swash plate and the snap ring.

A spring sheet is disposed between the rear surface of the swash plate and the compression spring.

According to the present invention of the configuration as described above, the structure is simplified by separating the torque transmission member for transmitting the rotational power of the drive shaft and the compression support member for supporting the pressure transmitted to the swash plate between the crank chamber and the cylinder bore This has the advantage of significantly reducing manufacturing costs.

In addition, according to the present invention there is an advantage that can increase the durability by significantly reducing the eccentricity and unbalance of the swash plate relative to the drive shaft.

1 is a longitudinal cross-sectional view showing the configuration of a variable displacement swash plate compressor according to the prior art.
2 is a longitudinal cross-sectional view showing the structure of a variable displacement swash plate compressor according to the present invention.
3 is an enlarged perspective view illustrating a variable structure of a swash plate in FIG. 2.
4 is a front exploded perspective view of FIG. 3.
5A and 5B are side views illustrating the variable structure of the swash plate at the minimum and maximum inclination angles of the swash plate, respectively.
Figure 6 shows the swash plate structure of Figure 4, (a) is a front view, (b) is a perspective view, (c) is a rear view.

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

Figure 2 is a longitudinal sectional view showing a structure of a variable displacement swash plate compressor according to the present invention, Figure 3 is an enlarged perspective view of the variable structure of the swash plate in Figure 2, Figure 4 is a front exploded perspective view of Figure 3, Figure 5a And Figure 5b is a side view showing the variable structure of the swash plate at the minimum and maximum inclination angle of the swash plate, respectively, Figure 6 shows the swash plate of Figure 4, (a) is a front view, (b) is a perspective view, (c) Back view.

First, with reference to Figure 2 will be described schematically the structure of the variable displacement swash plate compressor according to the present invention.

As shown, the variable displacement swash plate compressor (C) according to the present invention includes a cylinder block (210) having a plurality of cylinder bores (212) formed in parallel in a longitudinal direction on an inner circumferential surface, and the cylinder block (210). It consists of a front housing 216 hermetically coupled to the front of the rear housing 218 hermetically coupled via a valve plate 220 at the rear of the cylinder block 210.

A crank chamber 286 is formed inside the front housing 216 together with the cylinder block 210, and one end of the drive shaft 120 is rotatably supported through the bearing in the front housing 216. The other end of the drive shaft 120 is supported by a bearing installed in the cylinder block 210 through the crank chamber 286.

The support structure of the drive shaft 120 is not limited to this configuration, the drive shaft (alone) to the front housing 216 and the rear housing 218, the cylinder block 210 and the rear housing 218, or the cylinder block 210 alone ( A structure in which 120 is supported may be adopted.

In the crank chamber 286, a lug plate 130 and a swash plate 140 are installed around the drive shaft 120.

A fourth inclined surface 131 is formed on the lug plate 130, and a compression support arm 141 protrudes from the front surface of the swash plate 140 so that the lug plate 130 rotates. The inclination angle of the swash plate 140 is variable while the compression support arm 141 of the swash plate 140 slides on the fourth inclined surface 131.

In addition, both side surfaces near the outer circumferential surface of the swash plate 140 are fitted to the piston 214 so as to be slidable through the shoe 276.

Therefore, as the swash plate 140 rotates in an inclined state, the pistons 214 inserted through the shoe 276 are reciprocated in each cylinder bore 212 of the cylinder block 210.

However, the coupling between the swash plate 140 and the piston 214 is not limited to the above-described structure, and various other known coupling structures may be adopted.

In addition, a suction chamber 222 and a discharge chamber 224 are respectively formed in the rear housing 218, and each cylinder is provided in the valve plate 220 interposed between the rear housing 218 and the cylinder block 210. Intake valves 232 and discharge valves 236 are formed respectively corresponding to the bores 212.

By the reciprocating motion of the piston 214, the refrigerant in the suction chamber 222 is sucked into the cylinder bore 212, compressed and discharged to the discharge chamber 224, the pressure in the crank chamber 286 and the cylinder bore ( According to the pressure difference of 212, the inclination angle of the swash plate 140 is changed to adjust the discharge amount of the coolant.

The suction valve 232, the discharge valve 236, the suction chamber 222, and the discharge chamber 224 are not limited to the above-described structure, and may include other well-known valve structures such as a rotary valve, and accordingly, the suction chamber and the discharge chamber may be included. The position of the thread can also be set in various ways.

On the other hand, as shown in Figure 3 to 6, the drive shaft 120 is provided with a torque transmission member 300, the torque (moment) by the drive shaft 120 by the torque transmission member 300. It can be delivered to the swash plate 140.

That is, when the drive shaft 120 rotates, the torque transmission member 300 fixed to the drive shaft 120 rotates at the same time, and the swash plate 140 is caught by the torque transmission member 300 to rotate simultaneously. have.

Specifically, the swash plate 140 is formed such that the insertion hole 142 through which the drive shaft 120 and the torque transmission member 300 are inserted to be movable relative to each other is formed therethrough, and a part of the torque transmission member 300 and the Some of the insertion holes 142 are slidably coupled to each other.

In the figure, the torque transmission member 300 has a plate shape of the same thickness. However, when the swash plate 140 is moved between the minimum inclination angle and the maximum inclination angle, only one portion may have the same thickness, including the insertion hole 142 and the portion that slides.

The torque transmission member 300 and the drive shaft 120 may be integrally formed.

However, it is preferable that the torque transmission member 300 is separately coupled to the drive shaft 120 for ease of manufacture.

Specifically, the drive shaft 120 is formed through the coupling hole 121 extending in the longitudinal direction, the torque transmission member 300 is inserted into the coupling hole 121, the torque transmission member 300 The driving shaft 120 may be fixed to protrude to both sides.

To this end, the torque transmission member 300 may be fixed to the coupling hole 121 by an interference fit or a combination using a thermal expansion rate, or may be fixed using a fastening means such as a pin or a screw.

Furthermore, the rear surface of the lug plate 130 forms a coupling groove 133 into which the torque transmission member 300 is fitted so that the torque transmission member 300 is firmly connected to the drive shaft 120 and the lug plate 130. It is desirable to be fixed securely (see FIG. 4).

On the other hand, it is preferable to adopt a structure for limiting the movement in the range between the minimum inclination angle and the maximum inclination angle of the swash plate 140 with respect to the torque transmission member 300.

To this end, as illustrated in FIGS. 5A and 5B, the swash plate may be formed on a portion of one side surface protruding from the drive shaft 120 of the torque transmission member 300 and a portion of one side surface of the insertion hole 142, respectively. The first inclined surface 320 and the second inclined surface 142a are inclined in a direction away from the driving shaft 120 from the front to the rear to contact each other at the minimum inclination angle of the 140.

In addition, a part of the other side surface of the insertion hole 142, from the front to the rear to contact with the other side surface protruding from the drive shaft 120 of the torque transmission member 300 at the maximum inclination angle of the swash plate 140. The third inclined surface 142b inclined in the direction approaching the drive shaft 120 is formed.

Accordingly, when the swash plate 140 is at the minimum inclination angle, the first inclined surface 320 and the second inclined surface 142a are in contact with each other to prevent further deviation from the angle, and when the swash plate 140 is at the maximum inclined angle, the torque transmission member ( The other side of the 300 is in contact with the third inclined surface 142b of the insertion hole 142 to prevent any further deviation.

Meanwhile, a compression support arm 141 protruding toward the lug plate 130 is formed on the front surface of the swash plate 140, and the compression support arm 141 is in contact with the compression support arm 141 on the rear surface of the lug plate 130. A fourth inclined surface 131 inclined from the rear to the front in the radial direction of the lug plate 130 is formed.

In this case, the compression support arm 141 and the fourth inclined surface 131 constitute a compression support member.

When the swash plate 140 is inclinedly moved, the tip of the compression support arm 141 slides in contact with the fourth inclined surface 131.

As shown in FIG. 3, the fourth inclined surface 131 may be formed on the guide protrusion 136 protruding from the rear surface of the lug plate 130.

When the tip of the compression support arm 141 is formed of a curved surface convex toward the front, the surface to be moved is not damaged is more smoothly possible to move.

Furthermore, a stopper 146 protruding toward the lug plate 130 is formed on the front surface of the swash plate 140 on the opposite side of the compression support arm 141 about the driving shaft 120, and the swash plate 140. At the maximum inclination angle of the) may be in contact with the back of the lug plate 130 to prevent further rotation.

On the other hand, a swash plate support member 400 for supporting the swash plate 140 is provided on the drive shaft 120 at the rear of the swash plate 140.

The swash plate supporting member 400 may include a snap ring 410 fixed to the drive shaft 120 at the rear of the swash plate 140, and a compression spring disposed between the rear surface of the swash plate 140 and the snap ring 410. 420.

In this case, it is preferable that the spring sheet 430 is contacted between the rear surface of the swash plate 140 and the compression spring 420 so as to more stably support the compression spring 420.

As such, according to the present invention, the torque transmission member 300 and the compression support member can be separated, and the coupling configuration between the lug plate 130 and the swash plate 140 is greatly simplified.

In addition, since the torque transmission member 300 and the compression support member are separated, it is easy to adjust the eccentricity or unbalance of the swash plate 140 with respect to the drive shaft 120, and as a result of such adjustment, the vibration or partial centrifugal force can be reduced to improve durability. Can be.

As mentioned above, although the preferred embodiment of the present invention has been described in detail, the scope of the present invention is not limited to the above-described embodiment and may include various modifications and variations within the scope of the following claims.

C ... variable displacement swash plate compressor
120 ... drive shaft
121 ... Joiner
130 ... lug plate
131 ... Fourth Slope
133 ... joiner
140. Saphan
141 ... Compression Support Arm
142 ... Insert hole
142a ... second slope
142b ... Third slope
146 ... stopper
210 ... cylinder block
212 ... Cylinder Bore
214 ... piston
216 ... front housing
218 ... rear housing
220 ... valve plate
222 ... suction chamber
224 ... discharge chamber
232 ... intake valve
236 ... discharge valve
276 Shoe
286 crankcase
300 ... torque transmission member
320. First slope
350 ... Fastening means
400 ... swash plate support member
410 ... snap ring
420 ... compression spring
430 ... spring seat

Claims (10)

housing;
A cylinder block in which a plurality of cylinder bores are formed;
A drive shaft rotatably supported by the housing or cylinder block;
A lug plate fixed to the drive shaft;
A torque transmission member fixed to the drive shaft;
A swash plate installed to change an inclination angle while rotating in association with a rotational motion of the drive shaft and the torque transmission member;
A swash plate support member installed on the drive shaft to support the swash plate at the rear of the swash plate; And
A variable displacement swash plate type compressor comprising a piston that is reciprocally accommodated in the cylinder bore by rotation of the swash plate.
The method of claim 1,
The swash plate is formed so that the insertion hole through which the drive shaft and the torque transmission member are inserted to move relative to each other, a portion of the torque transmission member and a part of the insertion hole is slidably coupled to each other, characterized in that compressor.
The method of claim 2,
The variable displacement swash plate compressor of the torque transmission member, characterized in that at least the insertion hole and the relative slide movement portion has a plate shape.
The method of claim 1,
The drive shaft is formed to penetrate the coupling hole extending in the longitudinal direction, the torque transmission member is inserted into the coupling hole is fixed in a state protruding from the side of the drive shaft characterized in that the swash plate type compressor.
5. The method of claim 4,
The first inclined surface and the first inclined surface respectively inclined in a direction away from the drive shaft from the front to the rear so as to contact each other at the minimum inclination angle of the swash plate to a part of one side surface protruding from the drive shaft of the torque transmission member. 2 slopes are formed,
On the other side surface portion of the insertion hole, a third inclined surface inclined in a direction approaching toward the drive shaft from the front to the rear to contact with the other side projecting from the drive shaft of the torque transmission member at the maximum inclination angle of the swash plate Capacity variable swash plate compressor characterized in that it is.
The method of claim 1,
The front surface of the swash plate is formed with a compression support arm protruding toward the lug plate, the rear surface of the lug plate is in contact with the compression support arm and the fourth inclined surface inclined from the rear to the front in the radial direction of the lug plate Capacity variable type swash plate compressor characterized in that it is formed.
The method according to claim 6,
Capacitively variable swash plate compressor characterized in that the front end of the compression support arm is made of a curved surface convex toward the front.
The method according to claim 6,
The front of the swash plate is formed with a stopper projecting toward the lug plate on the opposite side of the compression support arm around the drive shaft, the variable swash plate characterized in that the contact with the back of the lug plate at the maximum inclination angle of the swash plate Type compressor.
The method of claim 1,
The swash plate supporting member includes a snap ring fixed to the drive shaft at the rear of the swash plate, and a compression spring disposed between the rear surface of the swash plate and the snap ring.
10. The method of claim 9,
The variable displacement swash plate type compressor, characterized in that the spring sheet is disposed between the back of the swash plate and the compression spring.

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