CN103790803A

CN103790803A - Brake pump piston ring of car air compressor

Info

Publication number: CN103790803A
Application number: CN201410031504.XA
Authority: CN
Inventors: 胡怀纲; ***; 吴立来; 黄代凤; 曹存军
Original assignee: NANJING FEIYAN PISTON RING CO Ltd
Current assignee: NANJING FEIYAN PISTON RING CO Ltd
Priority date: 2014-01-23
Filing date: 2014-01-23
Publication date: 2014-05-14

Abstract

The invention discloses a brake pump piston ring of a car air compressor. The brake pump piston ring comprises a first ring and a second ring. A first piston ring groove and a second piston ring groove are formed in the piston from top to bottom in the circumferential direction, wherein the first piston ring groove and the second piston ring groove are embedded into the first ring and the second ring respectively. The first ring and the second ring are piston ring sets in the opposite twist directions. According to the brake pump piston ring of the car air compressor, the sealing effect is improved through the opposite twist directions of the piston ring, downward exhaust air of the air compressor is reduced, air pressure inside a crank case in the air compressor is controlled, engine oil is prevented from pumping upwards, and the oil pumping fault rate of the air compressor is reduced by 45 percent.

Description

A kind of brake pump piston ring of vehicle air compressor

Technical field

The present invention relates to a kind of piston ring, be specifically related to a kind of brake pump piston ring.

Background technique

Existing vehicle air compressor piston ring adopts nose shape taper-face ring, and the operation surface of taper-face ring is tapered, and the conical surface upwards reduces gradually, and the bottom of nose shape taper-face ring is provided with a small-rabbet, and notch down.Piston ring in vehicle air compressor is compression ring, Main Function is the sealing that guarantees piston and cylinder wall, wherein, the sealing effect of first ring accounts for 80 ~ 90% of piston ring integral sealing effect, conventionally the first ring in vehicle air compressor is positive distortion external nose conical ring, be unfavorable for air compressor envelope gas, under air compressor, exhaust is larger.

Summary of the invention

Goal of the invention: the object of the invention is to for the deficiencies in the prior art, a kind of brake pump piston ring of vehicle air compressor is provided, for solving the heavy problem of exhaust under air compressor.

Technological scheme: the brake pump piston ring that the invention provides a kind of vehicle air compressor, comprise first ring and second ring, from piston head, from top to bottom along circumferentially having the first piston annular groove that embeds first ring and the second-ring groove that embeds second ring, described first ring and second ring are the contrary piston ring of distortion; No matter on can effectively controlling in the sideshake of machinery oil between piston ring and piston ring groove, alter, be in piston stroking upward and descending process, and the contrary bipassage ring of distortion all forms linear sealing face with annular groove end face.

Further, described first ring is reverse torsion ring, and described second ring is positive twist type ring; In the time of up-stroke of piston, the outside, lower end surface of reverse torsion ring contacts with annular groove lower end surface, and inner side, positive twist type ring lower end surface contacts with piston ring groove lower end surface, thereby forms the oily passage of altering of sealing; On the other hand, in the time of descent of piston, inner side, reverse torsion ring upper-end surface contacts with annular groove upper-end surface, end in contact on outside, positive twist type ring upper-end surface and annular groove, and shape airtight passage reduces alters oil.

Preferably, the end-gaps of the second ring of described first ring is 0.05 ~ 0.25mm, and this small closed end can dwindle the passage of altering that lubricates in brake pump crankcase effectively, alters oil thereby reduce brake pump.

Further, described first ring and second ring are taper-face ring, and taper-face ring not only has effect of the sealing gas of rectangular ring, also play the effect that increases frizing simultaneously.

Preferably, the conical surface angle of the second ring of described first ring is 2 ° ± 30 ', can increase the contact angle between piston ring and cylinder sleeve, increase the frizing ability of piston ring.

Beneficial effect: the present invention carrys out lift-off seal effect by the contrary direction of twist of piston ring, reduces the lower exhaust of air compressor, controls the air pressure in air compressor crankcase, prevents from altering on machine oil, makes air compressor alter oily failure of removal rate and declines 45%.

Accompanying drawing explanation

Fig. 1 is piston ring and the annular groove situation schematic diagram when up;

Fig. 2 is piston ring and the annular groove situation schematic diagram when descending;

Fig. 3 is the structural representation of piston ring;

Fig. 4 is the sectional drawing of first ring along A-A face in Fig. 3;

Fig. 5 is the sectional drawing of second ring along A-A face in Fig. 3.

Embodiment

Below technical solution of the present invention is elaborated, but protection scope of the present invention is not limited to described embodiment.

embodiment:a kind of brake pump piston ring of vehicle air compressor, comprise first ring 1 and second ring 2, embed the first piston annular groove 4 of first ring 1 and the second-ring groove 5 of embedding second ring 2 along circumferentially having from top to bottom from piston 3 tops, the taper-face ring that first ring 1 is anti-twist, the taper-face ring that second ring 2 is positive distortion, the end-gaps S of bipassage ring is 0.10mm, as shown in Figure 3; The conical surface angle of first ring 1 is 2 ° ± 30 ', as shown in Figure 4; The conical surface angle of second ring 2 is 2 ° ± 30 ', as shown in Figure 5; In the time of piston 3 up stroke, as shown in Figure 1, the positive reverse torsion ring of working state produces small distortion angle α under distortion action, wherein, the anti-twist angle α that reverse torsion ring produces makes the outside, lower end surface of reverse torsion ring contact with annular groove lower end surface, the anti-twist angle α that positive twist type ring produces makes inner side, positive twist type ring lower end surface contact with piston ring groove lower end surface, thereby forms the oily passage of altering of sealing; In like manner, in the time that piston 3 is descending, as shown in Figure 2, inner side, reverse torsion ring upper-end surface contacts with annular groove upper-end surface, end in contact on outside, positive twist type ring upper-end surface and annular groove, channels in crankcase under the gas at shape airtight passage minimizing piston 3 tops, thereby reduces brake pump in the time of negative inspiratory pressure stroke, because the anticyclonic lubricant mist suck-back in crankcase enters piston head, and then discharge to form with gas and alter oil.

As mentioned above, although represented and explained the present invention with reference to specific preferred embodiment, it shall not be construed as the restriction to the present invention self.Not departing under the spirit and scope of the present invention prerequisite of claims definition, can make in the form and details various variations to it.

Claims

1. the brake pump piston ring of a vehicle air compressor, it is characterized in that: comprise first ring and second ring, from piston head, from top to bottom along circumferentially having the first piston annular groove that embeds first ring and the second-ring groove that embeds second ring, described first ring and second ring are the contrary piston ring group of distortion.

2. the brake pump piston ring of vehicle air compressor according to claim 1, is characterized in that: described first ring is reverse torsion ring, and described second ring is positive twist type ring.

3. the brake pump piston ring of vehicle air compressor according to claim 1, is characterized in that: the end-gaps of the second ring of described first ring is 0.05 ~ 0.25mm.

4. the brake pump piston ring of vehicle air compressor according to claim 1, is characterized in that: described first ring and second ring are taper-face ring.

5. the brake pump piston ring of vehicle air compressor according to claim 4, is characterized in that: the conical surface angle of described first ring and second ring is 2 ° ± 30 '.