CN1318691A - Hinging device for variable compressor - Google Patents

Abstract

By changing the inclination of a cam plate (19), the stroke of a piston (23) is changed to change the discharge displacement a of compressor. A hinge mechanism (22) is positioned between a rotating support (17) and the cam plate (19). The hinge mechanism includes a guide pin (38), and the guide pin transfers the rotational motion of the rotating support (17) to the cam plate (19) and permits inclination of the cam plate. At least a part of the guide pin (38) is hollow.

Description

The articulated mounting that is used for positive displacement compressor

The present invention relates to a kind of pilot pin of using in articulated mounting in the positive displacement compressor that a kind of vehicle air conditioning uses and this articulated mounting.

A kind of typical positive displacement compressor comprises a housing, and this housing comprises a cylinder block and the live axle by housings support.In cylinder block, form one group of hole round live axle, piston of configuration in each hole.A swash plate is positioned on the live axle and by this live axle and drives by a special articulated mounting, thereby this swash plate tilts along with the rotation of live axle one and with respect to live axle.When the tilt angle varied of swash plate, swash plate slides along the live axle axial surface.

Each piston is connected on the excircle of swash plate.The rotation of live axle changes into the to-and-fro motion of piston, finishes air-breathing and compression process in each cylinder-bore.Control the tilt angle of swash plate by the pressure in the crank chamber at control swash plate place, thereby change the stroke and the air displacement of piston.

Fig. 9 represents the example of an articulated mounting between swash plate and live axle.

Fig. 9 device is from the patent of Japanese unexamined, and publication number is Heill-93833.Live axle 61 is contained on the rotor 63 in the crank chamber 62, and pair of support arms 64 is outstanding from the rotor 63.Guide hole 65 is formed on separately the supporting arm 64.

In crank chamber 62, swash plate 66 is being supported by live axle 61.For the weight that limits swash plate 66 with prevent that piston shoes 69 from burning out, swash plate 66 comprises swash plate body 67 and godet 68 made of iron of an aluminum.Swash plate body 67 is fitted on the godet 68.Swash plate body 67 is connected on the piston 70 via piston shoes 69, and these piston shoes slide on the excircle of swash plate body 67.

Stretch out a pair of pilot pin 71 from swash plate 66.Each pilot pin 71 all has a spheroid 71a, and this spheroid is contained in the guide hole 65.Supporting arm 64, guide hole 65 and pilot pin 71 have formed an articulated mounting.When the variation in pressure in the crank chamber 62, the tilt angle of swash plate 66 also changes, the result, and the stroke of piston 70 can change when each piston 23 top dead center position is constant substantially.

In fact two kinds of moment loadings are arranged on swash plate 66, promptly, a kind of moment that causes by centrifugal force and a kind of based on cross correlation produced between the pressure (crank press Pc) in pressure in the cylinder hole and the crank chamber 62 moment, and the tilt angle of swash plate 66 is to determine according to the balance of these moments.The quality that forms the pilot pin 71 of articulated mounting can have influence on the moment that centrifugal force produces, and is worked in the tilt angle that increases swash plate 66.

Consider the effect of centrifugal moment, Fig. 9 X, Y, Z coordinate system.Represent swash plate 66 swing axiss with Z; Represent axis with Y perpendicular to the live axle 61 of swing axis Z; Represent not only perpendicular to Y but also perpendicular to the axis of Z with X.The intersection point of reference axis is represented with initial point O.In this rectangular coordinate system (X, Y, Z), with swash plate 66 with respect to the product of inertia Ixy on XZ plane and yz plane and this swash plate with respect to square the multiplying each other of the angular velocity of live axle 61, just obtain this centrifugal moment.(, being attached among the present invention by reference) at this with reference to U. S. Patent 5573379.The product of inertia Ixy here is expressed as Ixy=∫ xydm.Dm represents to form the small mass block of swash plate assembly.

Therefore, the quality of pilot pin 71 is bigger, and its influence to this moment during high speed rotating is also bigger.Therefore, in order during high speed, to reduce the tilt angle of swash plate 66, just need higher crank press Pc.Therefore, vibration will occur in the crank press control procedure, the wearing and tearing of the Sealing of sealing drive shaft more may produce.And then in the compressor of no-clutch, power consumption is risen between the on-stream period of discharge capacity minimum.

When swash plate body 67 usefulness aluminums are done and are contained on the guide plate 68 made of iron, compare with compressor made of iron fully with swash plate 66 to the axial distance of pilot pin 71 spheroid part 71a from the plane of swash plate body 67 and to have increased approximately 20%, press-fit intensity in order to assurance swash plate 66.Therefore, the influence of moment has increased.

The present invention has considered the problems referred to above.One object of the present invention just provides a kind of articulated mounting of positive displacement compressor, and this articulated mounting can reduce pressure in the crank chamber, and the reducing of this pressure is absolutely necessary for change air displacement under the high speed rotating state; The generation that this device can suppress to vibrate; And can reduce the power consumption in the clutchless compressor, and a kind of pilot pin that is suitable for this articulated mounting is provided.

For reaching aforesaid and other purpose,, provide a kind of positive displacement compressor according to purpose of the present invention.This compressor comprises that one contains the housing of cylinder-bore, a kind of piston in the cylinder-bore, live axle, the swivel bearing spare of an integral installation on live axle by the housing supporting, a cam disk and articulated mounting of being contained in.This cam disk is connected to the to-and-fro motion that on the piston rotatablely moving of live axle is changed into piston.This cam disk tilts with respect to live axle.When the tilt variation of cam disk, the stroke of piston can change and change the air displacement of compressor.Articulated mounting is between swivel bearing spare and cam disk.Articulated mounting comprises that a rotation that is used for swivel bearing spare is delivered on the cam disk and allows the pilot pin that cam disk tilts, and wherein the part of pilot pin is a hollow.

In conjunction with the accompanying drawings, adopt mode for example that principle of the present invention is made an explanation, others of the present invention and advantage will be clearer in narration subsequently.

Objects and advantages of the present invention can be more readily understood by the description below in conjunction with the given preferred embodiment of accompanying drawing.

Fig. 1 is the cross-sectional view of first embodiment of the invention.

Fig. 2 (a), 2 (b), 2 (c) are the cross sectional representation of various pilot pins.

Fig. 3 (a), 3 (b) are the graphic schematic cross-sections of explanation swash plate.

Fig. 4 is the plotted curve that concerns between expression tilt angle of swash plate and the moment.

Fig. 5 is the partial cross section view of second embodiment's of expression a articulated mounting.

Fig. 6 is the partial plan layout of the articulated mounting of Fig. 5.

Fig. 7 (a), 7 (b) are the cross-sectional views that expression is used in other embodiment of the pilot pin in first embodiment's the compressor.Fig. 7 (c) is the stereogram of this embodiment's a pilot pin.

Fig. 8 (a) is the cross-sectional view that is used in another embodiment of pilot pin in second embodiment's the compressor.Fig. 8 (b) is the stereogram of this embodiment's pilot pin.

Fig. 9 is the partial cross sectional view of a positive displacement compressor of prior art.

First of positive displacement compressor of a vehicle air-conditioning of the present invention described with reference to Fig. 1, Fig. 2 and Fig. 3

Embodiment.

As shown in Figure 1.One compressor 10 comprises that a cylinder block 11, one are contained in the front-shell-cover 12 of cylinder block 11 front ends, a back cover spare 14 that is loaded on cylinder block 11 rear ends by a valve disc 13.Shell spare 12, shell spare 14, valve disc 13 and one group of bolt 10a of cylinder block 11 usefulness are fixed with each other.(only having drawn one among the figure).A crank chamber is between cylinder block 11 and front-shell-cover 12.

Live axle 16 usefulness bearings are bearing on cylinder block 11 and the front-shell-cover 12.Projected edge plate 17 is loaded on the live axle 16 in the crank chamber 15.Projected edge plate 17 transmits thrust to the internal face of front-shell-cover 12 by a thrust bearing 18.

One swash plate 19, or a cam disk comprises the swash plate body 20 and a guide plate 21 made of iron of an aluminum, and swash plate body 20 is fitted on the guide plate 21.Like this, suppressed burn between swash plate 19 and iron piston shoes 23a.Also limited the weight of swash plate.Guide plate 21 has a through hole 21a, and live axle 16 passes through hole 21a.An articulated mounting 22 is configured between projected edge plate 17 and the swash plate 19.Therefore, swash plate 19 is along with flange plate 17 and live axle 16 rotate synchronously, and swash plate 19 can tilt with respect to live axle 16 on live axle 16 in axial sliding simultaneously.

On articulated mounting 22 position opposite with respect to live axle 16, guide plate 21 has a balancer weight 21b.Between flange plate 17 and guide plate 21, a spring 16a is sleeved on the live axle 16.Spring 16a pushes away the direction of swash plate 19 to cylinder block 11, that is, the direction that reduces to the tilt angle pushes away.

One group of cylinder-bore 11a (only having drawn one among Fig. 1) is arranged in cylinder block 11, the configuration of 11a equal angles compartment of terrain, these holes.A single head pison 23 all is housed in each cylinder-bore 11a.The front opening of cylinder-bore 11a is by valve disc 13 sealings, and a compression chamber 11b is positioned at each cylinder-bore 11a.The position of respective pistons 23 is depended in the variation of compression chamber 11b volume.Each piston 23 is connected on the periphery of swash plate 19 by a pair of piston shoes 23a.Therefore, the rotatablely moving of swash plate 19 that is produced by the rotation of live axle 16 converts the to-and-fro motion of piston 23 to.

Live axle 16 is connected on the motor 25 by a driving mechanism 24.Driving mechanism 24 can be a clutch device (a for example magnetic clutch), and it connects or disconnects transmission of power, and is controlled by the outside.Perhaps, driving mechanism is non-clutch form (for example: belt is connected with belt pulley).Present embodiment just is the driving mechanism 24 of non-clutch-type.

An air-inlet cavity 26 and the exhaust cavity 27 around this air-inlet cavity 26 are arranged in back cover spare 14.On the valve disc 13 with on each corresponding position of cylinder- bore 11a 30, one outlet valves 31 that open and close exhaust port 30 of 28, one exhaust ports of an inlet hole are being arranged all.Air-inlet cavity 26 and exhaust cavity 27 are connected to each other by the refrigerating circuit 32 of outside.

The gas service duct 33 that all has a connecting crank chamber 15 and exhaust cavity 27 on cylinder block 11, valve disc 13 and the back cover spare 14 is being connected the take-off channel 34 of crank chamber 15 and air-inlet cavity 26 with one.A control valve 35 is contained on the service duct 33.Control valve 35 is similar to and is disclosed in Japanese unexamined patent publication No., publication number is the control valve among the Hei9-268973, has a bellows that moves along with the change of suction pressure, one and produces the inductance coil of electromagnetic force and one control the open degree of service duct 33 according to the electromagnetic force of the displacement amount of bellows and inductance coil valve system.The parts of not representing control valve 35 among the figure.

When the pressure in the air-inlet cavity 26 reaches or during less than predetermined value, bellows moves opens service duct 33, when air-inlet cavity 26 reaches or during greater than predetermined value, service duct 33 keeps closed conditions.The air displacement of compressor can be by adjusting with the pressure (crank press Pc) in the control valve 35 control crank chambeies.Like this, when the pressure in the air-inlet cavity 26 was low, the open degree increase of control valve 35 made crank press Pc increase.Correspondingly, the tilt angle of swash plate 19 (perpendicular to the folded angle of the plane of live axle 16 and swash plate 19) reduces, and therefore, the stroke of each piston 23 also reduces, and air displacement also reduces.On the other hand, when air-inlet cavity 26 pressure were higher, the open degree of control valve 35 reduced, and made crank cavity pressure Pc reduce.The tilt angle of swash plate increases, and therefore, the stroke of each piston 23 increases, and air displacement also increases.

Next, further describe articulated mounting 22.Articulated mounting 22 has two supporting arms that stretch out later 36 from projected edge plate 17 (only having drawn on the figure), be formed at 37, two of guide holes in each supporting arm 36 is loaded on pilot pin 38 on the swash plate 19.Each guide hole 37 all is columned.Pilot pin 38 is parallel, and an imaginary plane that comprises drive axis is between two pilot pins 38.A pilot pin 38 is corresponding to each supporting arm 36.The shape and size of pilot pin all are identical, with respect to above-mentioned imaginary plane symmetry.

Each pilot pin 38 comprises a body of rod 38a who links to each other with swash plate 19 and a spheroid 38b who is formed on body of rod 38a end.Spheroid 38b is installed in the guide hole 37.Each spheroid 38b has an external diameter bigger than the diameter of body of rod 38a, and the far-end of each spheroid 38b is all clipped by the plane.It is hollow that each spheroid 38b has a part at least.Each pilot pin 38 all forges with upset forging machine or Pressesforging.

Hollow cavity 38c opening in each pilot pin 38 is at the far-end of spheroid 38b.The shape of hollow cavity 38c can reasonably be selected, for example, any one shape in many shapes, first shape shown in Fig. 2 (a) reaches the central part of spheroid 38b approx at this shape hollow chambers of the heart 38c; Second shape is shown in Fig. 2 (b), and hollow cavity 38c reaches body of rod 38a; The 3rd shape shown in Fig. 2 (c), hollow cavity 38c reach body of rod 38a and guide plate 21 binding sites near.The quality of the pilot pin 38 shown in 2 (a), 2 (b), 2 (c) descends in the mode shown in the following inequality: Fig. 2 (a)＞Fig. 2 (b)＞Fig. 2 (c).

The shape of swash plate 19 is similar to day patent of not examining of the present disclosure, and publication number is the swash plate among the Hei7-293429 (Usp5.573.379).Fig. 3 (a) and Fig. 3 (b) use the X.Y.Z coordinate system.In addition, the axis of oscillation of swash plate 19 is represented with S.The axis of live axle 16 is represented with Y.A z axis is perpendicular to Fig. 3 (a) paper plane.And be parallel to axis of oscillation S.An X-axis line is perpendicular to Y and z axis.The point of intersection of X, Y and z axis is defined as initial point O.As shown in Figure 4, when the tilt angle of swash plate 19 when zero angle begins to rotate, swash plate 19 can produce moment M in (on the direction that increases at the tilt angle of swash plate 19) on the direction that air displacement increases with respect to the product of inertia Ixy on XY plane and YZ plane.

Compressor operation is as follows:

Along with live axle 16 rotations, swash plate 19 rotations, the rotation of swash plate 19 is converted to the to-and-fro motion of each piston 23 by piston shoes 23a.As a result, in compression chamber 11b, the refrigeration aspiration goes into, compresses, discharges successively to repeat.The refrigeration agent that is transported to the air-inlet cavity 26 from external refrigeration cycle 32 sucks among the compression chamber 11b by inlet hole 28.After refrigeration agent is compressed, be discharged to exhaust cavity by exhaust port 30.Refrigeration agent is discharged to exhaust cavity 27 and enters outside refrigeration cycle 32 via exhaust port.

The open degree of control valve 35 is regulated according to refrigeration load.When pressure was high in refrigeration load height and the air-inlet cavity 26, the open degree of control valve reduced, and the pressure in crank chamber 15 (crank press Pc) also decreases, and this can increase swash plate 19 tilt angle.The stroke of each piston is along with increase, and compressor 10 turns round under big air displacement.On the other hand, when the pressure when refrigeration load in the low and air-inlet cavity 26 was also low, the pressure in the open degree of control valve 35 and crank chamber 15 (crank press Pc) increased, and like this, the tilt angle of swash plate 19 reduces.As a result, piston stroke 23 reduces, and compressor 10 moves under little discharge capacity.

All act on the swash plate 19 based on cross correlation produced between cylinder-bore internal pressure and the crank press Pc moment, moment that centrifugal force produced and the power of spring 16a, the tilt angle of swash plate 19 is to determine according to the balance between these components.

The rotation of swash plate 19 and the moment that produces (moment that centrifugal force produces) be swash plate 19 in rectangular coordinate system (X, Y, Z) with respect to amassing after square the multiplying each other of the angular velocity omega of the inertia Ixy on XZ plane and YZ plane and live axle 16.

Shown in Fig. 3 (a), Y-axis is consistent with live axle 16 axis, and the Z axle is parallel to swing axis S.X-axis is perpendicular to X-axis and Z axle.For just, Y-axis is timing, the product of inertia Ixy=∫ xydm of swash plate forward on X axis.Here dm is the swash plate 19 quality differential that comprise pilot pin.Therefore, though the external diameter of piston 23, arrangement and quantity, the external diameter of swash plate 19, the external shape of pilot pin 38, and rotational speed (angular velocity omega) all immobilizes.The moment that is produced by rotation will change along with the center of the spherical body 38b of pilot pin 38 and the distance L between the XZ plane.

When swash plate 19 is to adopt iron guide metal 21 is press fit into to form to produce one greatly when press-fiting area on the aluminum metal swash plate body 20, compare with the swash plate 19 complete made of iron shown in Fig. 3 (b), distance L increases about 20% shown in Fig. 3 (a).Therefore, even pilot pin 38 shapes are identical, product of inertia Ixy that the swash plate 19 among Fig. 3 (a) produces and the swash plate 19 of Fig. 3 (b) are compared also to have significantly and are increased.

Near the swash plate 19 moment M that time rotation produces the minimal tilt angle can play the effect at the tilt angle that increases swash plate.Like this, when product of inertia Ixy was very big, influence was also big when high rotating speed.Therefore, reduce the tilt angle of swash plate 19, just require crank press Pc than higher.Even pilot pin 38 is identical in quality, when the quality of part outside being positioned at the XY face and pilot pin 38 distal sites was very big, it is very big that the product of inertia Ixy of pilot pin 38 also becomes.

Otherwise in this embodiment, because hollow cavity 38c has been arranged, so the quality of the preceding spherical position 38b of pilot pin 38 has reduced, even pilot pin 38 is identical in quality, product of inertia Ixy is also little than the swash plate that does not have hollow cavity 38c.And as shown in Figure 4,19 rotating moment M are littler than the moment Mo of traditional swash plate based on swash plate.Therefore, the required crank press Pc in tilt angle of change swash plate 19 has reduced.When changing the required crank press Pc in tilt angle when higher, even be adjusted to a predetermined tilt angle, one in the compression load changes slightly the tilt angle is changed, and may produce vibration.Yet when the change required crank press Pc in tilt angle reduced, vibration may produce hardly.This can recognize from the following fact that promptly, moment M is little compared with the variance ratio of the moment Mo of the swash plate that has the traditional pilot pin among Fig. 4 with respect to the variance ratio at the tilt angle of swash plate 19.The quality that reduces pilot pin 38 can make the quality of balancer weight 21b reduce, and helps to reduce the variance ratio of the running torque M of swash plate 19.

Present embodiment has following effect.

(1) to have a part at least be hollow to pilot pin 38.Like this, the meeting of certain part of pilot pin 38 product of inertia that influences the running torque of live axle 16 and swash plate 19 can reduce.Therefore, change the required crank press Pc of compressor air-discharging amount and just can be reduced under higher rotation speed, vibration also can be suppressed.In addition, in no-clutch type compressor, even vehicle air conditioning is closed, the power of motor also can be delivered to compressor.Yet, approaching time 0 at the tilt angle of swash plate 19, kinetic equation loss still can be reduced.And when the downstream at exhaust outlet of compressor was provided with an one-way valve, the cracking pressure of valve can be reduced and life can also be improved thereupon.

(2) guide hole 37 of the globular part 38b of pilot pin 38 and supporting arm 36 forms articulated mounting.Therefore, by guide hole 37 being processed into a kind of simple cylindrical or similar shape shape, the slip of swash plate 19 on live axle 16 will be led reposefully.

(3) hollowed out when pilot pin 38, the quality that product of inertia Ixy is had the greatest impact is removed.Because it is bigger compared with near-end to sell the influence of 38 far-end, so far-end is hollowed out.

(4) hollow cavity 38c opening is at far-end.Like this, by changing the degree of depth of hollow cavity 38c, change product of inertia Ixy at an easy rate, in addition, the processing of hollow cavity 38c is also fairly simple.

(5) far-end of pilot pin 38 spheroid 38b is by brachymemma.Therefore, comparing product of inertia Ixy with general complete pommel reduces.

(6) pilot pin is made with forging method.Therefore, its strength ratio is with the pilot pin height of the hollow cavity of cutting method processing.In addition, if pilot pin with upset forging machine or forging machine manufacturing, its productivity is just higher.

(7) swash plate 19 is made by aluminum metal swash plate body 20 and guide plate made of iron 21.Therefore, whole swash plate is lighter than iron swash plate.

(8) swash plate 19 directly is bearing on the live axle by the inwall of hole 21a.Like this, just need axle sleeve and the pivot that is connected swash plate and axle sleeve be installed on live axle 16, make number of spare parts reduce.

Second embodiment of the invention is described with reference to figure 5 and Fig. 6.In second embodiment, articulated mounting 22 is different with first embodiment.Others, second embodiment and first embodiment are basic identical.Therefore, identical parts are denoted by the same reference numerals, and only explain different.

As shown in Figure 5, an axle sleeve 39 is contained on the live axle 16 and allows and slides on live axle 16.A swash plate guide plate 21 is rotatably supported on the axle sleeve 39 by means of a pair of supporting axle 40 (figure only represents), and supporting axle 40 is along extending perpendicular to the live axle direction.

Articulated mounting 22 comprise two from guide plate 21 towards flange plate 17 two swing arms 41 that stretch out.A supporting arm 42 stretches out from flange plate 17, and pilot pin 43 is connected to swing arm 41 on the supporting arm 42.Swing arm 41 is around supporting arm 42, as shown in Figure 6.A guide hole 44 is formed in the supporting arm 42.Each swing arm 41 all has a pilot hole 45, and their parallel axes is in supporting axle 40.Pilot pin 43 is pressed onto in the pilot hole 45 and in the guide hole 44 of packing into.

Even guide hole 44 prolongs the tilt angle varied that becomes swash plate, the top dead center position of piston 23 is also constant basically.In other words, guide hole 44 is nearer from swash plate 19, and it is far away from live axle 16.Pilot pin 43 is cylinders of a hollow.

In the articulated mounting 22 of present embodiment, because pilot pin 43 moves along guide hole 44, swash plate 19 is along with the rotation of flange plate 17 one.And guiding swash plate 19 is in tilt motion and slide of live axle 16.

Therefore, present embodiment has except that the effect of describing in first embodiment (1) arrives (7), also has following effect.

(9) pilot pin 43, and it is the part of articulated mounting, move along guide hole 44, and the slip and the inclination of swash plate 19 play the guiding role.Therefore, pilot pin 43 can have a kind of simple linear structure, and can simplify processing.

(10) guide hole 44 is formed in the supporting arm 42, and pilot hole 45 is formed in the swing arm 41.Therefore, simple the swash plate of the structure of swash plate 19 in guide hole 44 is formed at swing arm 41.

Second embodiment is not limited to said structure, can be constructed as follows example.

With the same in first embodiment, in a structure using spherical pilot pin 38, the hollow cavity 38c of pilot pin 38 is formed among the body of rod 38a of pilot pin 38.Shown in Fig. 7 (a) and Fig. 7 (b).In addition, a hollow cavity 38c can be formed in the pilot pin 38, and can process a slit 38b in body of rod 38a, shown in Fig. 7 (c).In this case, the external diameter tolerance of body of rod 38a can increase.

In second embodiment, pilot pin 43 can form like this, that is, a partition wall is formed in the hollow part 43a, shown in Fig. 8 (a).Perhaps, shown in Fig. 8 (b), pin 43 end can be a solid body, and with among Fig. 5 simply the shape of pipe for it.Power on the pilot pin 43 effectively acts on the end of pilot pin 43.Yet, when pilot pin end 43 is entity, just improved the intensity of pilot pin 43.

In first embodiment, swash plate 19 can be as in second embodiment, links to each other rotationally with a sleeve 39 on being installed in live axle 16 by supporting axle 40.Perhaps, in second embodiment, swash plate 19 can be as being bearing on the live axle 16 in second embodiment.In addition, a spherical sleeve can be contained on the live axle 16, and swash plate 19 is rotatably supported on the outer surface of spherical sleeve.

Fig. 1 has two joints to the articulated mounting of Fig. 6.Here it is, and two pins 38 cooperate with two holes 37 among Fig. 1, and two arms 41 formation are as the joint among Fig. 6.Perhaps, each hingedly just in time has a joint.Yet spin balancing and stationarity angle are considered from transmission of power, and it is reasonable adopting two set of joints.

Swash plate 19 can be only with a kind of metal manufacturing, as ferrous metals and similar metal.In this case, do not need to press-fit the surplus amount, can reduce the distance between pilot pin 38 and the XZ face yet.Therefore, because pilot pin 38 is processed into hollow shape, product of inertia Ixy can further be reduced.Identical as the material of swash plate 19 and piston shoes 23a just need be carried out a kind of surface treatment (as sprayed aluminum) to piston shoes 23a slip surface and be burnt out preventing.

In second embodiment's articulated mounting 22, guide hole 44 can be formed in the swing arm 41, and pilot hole 45 can be formed in the supporting arm 42.

Pilot pin 38 can be used the method manufacturing of cutting or casting.

The present invention can be applicable to the pendulum type positive displacement compressor.

Under the situation that does not break away from design of the present invention and scope, can implement the present invention in many other concrete modes, this is obviously for the people who is familiar with related domain.Particularly, the present invention implements to be to be understood that in the following manner.

Therefore, at present example and embodiment should be counted as a kind of explain but not to a kind of restriction of the present invention, and the present invention is not limited in these given various details, but can change in the equivalence of appended claims and scope.

Claims (10)

1. a positive displacement compressor comprises that one has the housing of cylinder-bore (11a); A piston (23) that is contained in the cylinder-bore; Live axle (16) by the housing supporting; The swivel bearing spare (17) of an overall fixed on live axle; A cam disk that is connected to piston, be used for rotatablely moving of live axle changed into the to-and-fro motion of piston, wherein cam disk (19) tilts with respect to live axle, and, when the inclination of cam disk changed, the stroke of piston (23) changed to change the air displacement of compressor; And articulated mounting (22) that is positioned between swivel bearing spare (17) and the cam disk (19), it is characterized in that: this articulated mounting (22) comprises that one is used to transmit rotating to of swivel bearing spare (17) pilot pin (38) cam disk (19) and that allow the cam disk inclination, and wherein the part of pilot pin (22) is empty.

2. according to the described compressor of claim 1, it is characterized in that: articulated mounting comprises that a supporting arm (42) and that stretches to cam disk from swivel bearing spare is configured in targeting part (37) in the supporting arm, and pilot pin (38) comprising:

One be contained in the body of rod (38a) on the cam disk and one be arranged on the body of rod and diameter greater than the globular part (38b) of body of rod diameter, wherein globular part (38b) is assemblied in the targeting part (37), at least a portion of globular part (38b) is a hollow.

3. according to the described compressor of claim 2, it is characterized in that: pilot pin (38) has a hollow cavity, and its opening is on the globular part excircle, and wherein hollow cavity reaches the center of head substantially

4. according to the described compressor of claim 2, it is characterized in that: pilot pin (38) has a hollow cavity, and its opening is on the globular part excircle, and wherein hollow cavity reaches the body of rod.

5. according to the described compressor of claim 2, it is characterized in that: the part of the body of rod (38a) is planted in cam disk, another part of the body of rod (38a) is positioned at outside the cam disk (19), wherein pilot pin has a hollow cavity, its opening is on the outer surface of spheroid part, and wherein hollow cavity puts in the whole exposed parts of the body of rod.

6. according to the described compressor of claim 1, it is characterized in that: articulated mounting comprises:

One swing arm (41) stretches to swivel bearing spare (17) from cam disk (19);

Supporting arm (42) on swivel bearing spare (17);

A guide hole (44) is formed on in swing arm and the supporting arm one of them; And

A mounting hole (45) is formed on in another swing arm and the supporting arm another, and wherein pilot pin is configured in guide hole and the mounting hole.

7. according to the described compressor of claim 6, it is characterized in that: guide hole (44) is formed in the supporting arm (42), and mounting hole (45) is formed in the swing arm (41).

8. according to the described compressor of claim 7, it is characterized in that: swing arm is first swing arm, mounting hole is first mounting hole, and compressor further comprises one second swing arm and corresponding second mounting hole, first and second swing arms are configured in supporting arm (42) both sides relatively, wherein, first mounting hole is coaxial with second mounting hole, and the end of the pin that extends between swing arm and supporting arm is solid.

9. according to the described compressor of claim 1, it is characterized in that: pilot pin (38) forges.

10. according to the described compressor of claim 2, it is characterized in that: the far-end of spheroid part (38b) is cut out.

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