CN100595024C - Device for assembling piston oil rings - Google Patents

Abstract

The invention discloses a device for assembling piston oil rings. An assembling head is connected to a material storing column, a control rod for respectively controlling two piston oil rings to be arranged in the same annular groove of a piston is arranged in a through-hole in the assembling head, the upper end and the lower end of the control rod extend out of the through-hole, a structure for positioning the extending height of the control rod is arranged at the upper end of the through-hole, the extending height of the upper end of the control rod is enabled to be smaller than the width ofthe oil annular groove on the piston and larger than the height of a pushing-out ring in the oil annular groove, the lower section of the control rod is sleeved with a spring, a device for preventingthe oil rings from shape distortion when moving upwards is sleeved above the assembling head, a drive rod is arranged in an axial through-hole of the material storing column, and the upper end of thedrive rod is contacted with the control rod in the assembling head. The device can respectively assemble the two oil rings of the piston on one service position, and prevent the oil rings from shapedistortion in assembling.

Description

Device for assembling piston oil rings

technical field

The invention relates to an assembly device for piston rings, in particular to a device for assembling piston oil rings of motorcycle engines and general gasoline engines.

Background technique

Piston ring is an important part of the engine, it includes oil ring and gas ring, and its assembly quality has a great influence on the performance of the engine. The current piston is usually equipped with two air rings and two oil rings. The two air rings are respectively assembled in the two air ring grooves on the piston, and the two oil rings are assembled in an oil ring groove on the piston. They are respectively located at the upper and lower positions in the oil ring groove, and the two oil rings are spaced and supported by lining rings. Because the thickness of the gas ring is relatively thick, the assembly of mechanical equipment will generally not affect the quality of the gas ring assembly. Therefore, the existing devices for assembling piston rings of motorcycle engines and general gasoline engines are usually designed for the gas ring assembly of piston rings. For example, the published Chinese patent No. ZL200520010577.7 named "Device for Assembling Piston Rings" and the patent No. ZL200520010578.1 named "Automatic Assembly Machine for Piston Rings", the piston rings disclosed by these technical solutions Assembling machine, the structure of the feeding mechanism is to use the feeding push plate to push the piston ring laterally to feed the material. In order to ensure its rigidity, the feeding push plate must have a sufficient thickness to ensure its rigidity, and this is sufficient to ensure its rigidity. The thickness is often only suitable for assembling relatively thick air rings, but not for oil rings that are much thinner than the air rings, because the thickness of the oil rings of the pistons of motorcycle engines and general-purpose gasoline engines is only about 0.45mm. Light and thin. If the oil ring of the piston is assembled with the assembly device of the above structure, the thickness of the feeding push plate must be thinner than the thickness of the oil ring by about 0.45 mm. However, when the thickness of the feeding push plate is in such a thin state, its rigidity is already Very bad, during the feeding process, the feeding push plate is often deformed and stuck on the equipment, unable to work, and even causing damage to the equipment, resulting in poor reliability and high failure rate of the equipment. At the same time, because the oil ring is both light and thin, in the process of feeding, it will be deformed by a slight partial load force to form a stagnation, causing the oil ring to be stuck and damaged. Therefore, the device of the above-mentioned structure is not suitable for assembling the oil ring of the piston, so now the oil ring assembly of the piston of the motorcycle and the general gasoline engine is often still assembled manually, but the oil ring of the piston is manually assembled. Not only is the labor intensity of the workers high and the production efficiency is low, but once the force is improper, it is also easy to cause the oil ring to warp and deform and be scrapped. If it is not noticed after assembly, it will bury hidden dangers for the normal operation of the engine.

At present, there is also a ring-mounting device that adopts the axial feeding of the sleeve for the piston ring of the automobile engine piston, such as the disclosed technology named "Piston Ring Assembly Equipment" with the patent No. 200620093536.3, although the assembly equipment of this structure avoids However, this kind of piston ring assembly equipment is still designed for assembling the first and second rings of the piston gas ring. If it is used to assemble the oil ring of the piston, it will not prevent the piston ring from warping during the feeding process. Even with the curved structure, there is still a phenomenon that the oil ring warps and cannot be assembled in place when the thin oil ring is assembled, so the piston ring assembly equipment of this structure is still not suitable for assembling the oil ring of the motorcycle engine piston. Moreover, due to the ring installation equipment of this structure, only one piston ring can be assembled in one ring groove of the piston at one station. For example, two piston rings are respectively assembled in the same ring groove of the piston. Two stations must be used for assembly, so the equipment uses two stations for the assembly of the first and second rings of the gas ring. As a result, the assembly efficiency is relatively low, and the equipment occupies a large space, and the enterprise invests The equipment is relatively large, the site invested is relatively large, and the production cost is relatively increased.

Due to the defects of the existing technology, the oil ring assembly production of motorcycle engine and general gasoline engine pistons has not been reliably realized on the equipment. Therefore, the enterprises that manufacture motorcycle engines and general gasoline engines can only Manual assembly is adopted, the production efficiency is extremely low, and the labor intensity of workers cannot be reduced.

Contents of the invention

The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, to provide a device for assembling the oil rings of the pistons of motorcycle engines and general gasoline engines, which is used to control the installation of two oil rings on a piston by setting the assembly head The control rod and the device used to prevent the oil ring from warping and deforming when the oil ring moves upwards are placed on the assembly head. It can not only realize the assembly of two oil rings of a piston at one station, but also completely avoid the oil ring. Warpage occurs during assembly.

The object of the present invention is achieved in the following way: comprising a storage column and an assembly head, the assembly head is connected to the upper end of the storage column, the curved surfaces of the two transition smoothly, the assembly head is connected with the storage column through thread fit, and the upper end surface of the assembly head The bottom of the concave cavity is provided with an axial through hole, and a control rod for controlling the assembly of two oil rings in the same ring groove of the piston is telescopically arranged in the through hole, and the upper and lower ends of the control rod are respectively Extending out of the through hole, the middle section of the control rod is provided with a boss for limiting the position, and the upper end of the through hole is provided with a structure for positioning the protrusion height of the control rod, so that the protrusion height of the upper end of the control rod is smaller than the width of the oil ring groove on the piston. It is higher than the height of the support ring in the oil ring groove. The lower section of the control rod is covered with a compression spring. The compression spring is limited by the limit device provided on the boss in the middle section of the control rod and the lower end of the through hole. A device warping and deforming during movement, the storage column is provided with an axial through hole, a transmission rod is arranged in the axial through hole, and the upper end of the transmission rod is in contact with the control rod in the assembly head.

Due to the adoption of the above scheme, the bottom of the cavity on the upper end surface of the assembly head is provided with an axial through hole, and a control rod for controlling the assembly of the two oil rings in the same ring groove of the piston is telescopically arranged in the through hole. In the hole, the upper and lower ends of the control rod extend out of the through hole respectively, and the structure for positioning the height of the control rod protruding from the upper end of the through hole limits the position of the upward movement of the control rod through the boss used for limiting the position in the middle section of the control rod. , so that the protruding height of the upper end of the control rod is smaller than the width of the oil ring groove on the piston, and greater than the height of the support ring in the oil ring groove, and the elastic force of the compression spring on the lower part of the control rod makes the upper end of the control rod protrude in the compression spring The positioning height is maintained under the action of tension, which is the distance between two oil rings assembled in the same oil ring groove of the piston. In this way, when assembling the oil ring, put the piston in the cavity on the upper end surface of the assembly head so that the piston contacts the control rod. At this time, the upper end surface of the assembly head is just at the position of the lower groove wall of the oil ring groove about higher than the piston, and then Apply pressure to the piston so that the control rod retracts into the through hole to store force in the compression spring, and the control rod drives the transmission rod in the storage column to move downward to trigger the signaling device, and the sensor of the equipment sends out an instruction, at this time the assembly head The upper end surface is just below the upper groove wall of the oil ring groove of the piston. The power transmission mechanism of the equipment pushes the stacked piston rings stored on the storage column to move upwards by the thickness of a piece of oil ring, and the uppermost Push a piece of oil ring into the oil ring groove of the piston, and assemble it at the position above the existing supporting ring in the oil ring groove; then relax the pressure on the piston, the control rod returns under the tension of the compression spring, and pushes the piston to move up Back to the position, the upper end surface of the assembly head is just at the position of the lower groove wall of the oil ring groove about higher than the piston, the transmission rod in the storage column returns upward to break away from the contact with the signaling device, and the sensor of the equipment sends out a signal again. command, the power transmission mechanism of the equipment pushes several piston rings stacked on the storage column to move upward as a whole by the thickness distance of a piece of oil ring, pushes the top piece of oil ring into the oil ring groove of the piston, and assembles it in the oil ring groove in the position below the existing brace ring. Because the protruding height of the upper end of the control rod is smaller than the width of the oil ring groove on the piston, and greater than the height of the support ring in the oil ring groove, the positioning of the oil rings assembled twice in the same oil ring groove can be formed, and the oil ring can be assembled in one process. Press down the piston at one position and release it once, and you can complete the assembly of two oil rings in the same oil ring groove of a piston at one station, which is not available in any existing device for assembling piston rings. .

And because the assembly head is equipped with a device used to prevent warping and deformation of the oil ring when it moves upwards, the device can lightly press on the uppermost oil ring of several stacked piston rings, when the power transmission mechanism of the equipment pushes the piston When the ring moves upwards, the device used to prevent warping and deformation of the oil ring when it moves upwards is lightly pressed on the oil ring and moves up together with the oil ring, so that the oil ring with a relatively thin thickness can have a thrust state under a certain pressure The bottom remains flat and will not be warped due to diameter expansion and upward movement, which effectively ensures the reliability of mechanical assembly of the piston oil ring and eliminates assembly damage of the oil ring and hidden troubles.

The structure of the invention is simple to manufacture and is convenient for implementation. It not only improves the reliability and production efficiency of the mechanical assembly of the piston oil ring, but also can reduce the setting of stations, reduce the labor intensity of workers, and reduce the production cost. The present invention is popularized and applied in the manufacturing industry of motorcycle engines and general gasoline engines, and will certainly produce good effects.

The present invention will be further described below in conjunction with drawings and embodiments.

Description of drawings

Fig. 1 is a kind of embodiment structural representation of the present invention;

Fig. 2 is a schematic structural view of another embodiment of the present invention;

Fig. 3 is a structural schematic diagram of another embodiment of the present invention.

In the accompanying drawings, 1 is the assembly head, 2a and 2b are the pressure plates, 3 is the compression spring, 4 is the control rod, 4a is the boss, 5 is the positioning sleeve, 6a and 6b are the pressure plates, 7 is the telescopic shaft, and 8 is the nut , 9 is a cover plate, 10 is a compression spring, 11 is a support cantilever, 12 is a column, 13 is a machine table, 14 is a storage column, 15 is a counterweight ring sleeve, 16 is a transmission rod, 17 is a piston, and 18 is an oil Ring, 19 is a compression spring, 20 is a cylinder, and 21 is a connecting arm.

Detailed ways

Referring to Fig. 1, it is an embodiment of the device for assembling the piston oil ring, including a storage column 14, an assembly head 1, etc., the lower end of the storage column is connected with the guide column of the pushing system of the machine tool equipment, and the pushing system The pushing device is slidingly fitted with the storage column (not shown), and the oil rings 18 to be assembled are overlapped and put on the storage column 14 and supported by the pushing device of the pushing system. The assembly head 1 is an inverted round platform, and its upper part has a cylindrical section. The upper end surface of the cylindrical section of the assembly head 1 is provided with a concave cavity for positioning the piston 17, and the lower end surface of the assembly head 1 is provided with a concave cavity with internal threads. The upper end of the column 14 is provided with a boss with external threads. The assembly head 1 is connected to the upper end of the storage column 14, and the assembly head 1 is connected to the storage column 14 through screw fit, and the curved surfaces of the two are smoothly transitioned. The bottom of the concave cavity on the upper end surface of the assembly head is provided with an axial through hole penetrating to the top of the concave cavity on the lower end surface, and a control rod 4 for controlling the assembly of two oil rings in the same ring groove of the piston in sequence is set telescopically In the through hole, the upper and lower ends of the control rod 4 extend out of the through hole respectively, the middle section of the control rod 4 is provided with a boss 4a for limiting, and the upper end of the through hole is provided with a structure for positioning the control rod 4 to extend the height. The structure for positioning the height of the control rod is a positioning sleeve 5, the positioning sleeve 5 is connected and fixed on the upper end of the through hole, the upper end of the control rod 4 is extended through the positioning sleeve 5, and the middle section of the control rod 4 is used for positioning. The boss 4a is limited by the positioning sleeve 5, so that the extension height of the upper end of the control rod 4 is less than the width of the oil ring groove on the piston, and greater than the height of the support ring in the oil ring groove. The positioning sleeve 5 in this embodiment is screwed into the through hole, and can also be fixed in the through hole by interference fit. The lower part of the control rod 4 is covered with a compression spring 3, and the compression spring 3 is limited by a stopper provided on the boss 4a in the middle part of the control rod 4 and the lower end of the through hole. The stopper is a pressure plate fixed on the assembly head 1 with screws 2a, the lower end of the control rod 4 protrudes from the pressure plate 2a; or the limit device at the lower end of the through hole is a pressure sleeve that is threadedly engaged with the through hole, and the lower end of the control rod protrudes from the pressure sleeve. The storage column 14 is provided with an axial through hole, and a transmission rod 16 is arranged in the axial through hole, the upper end of the transmission rod 16 is in contact with the lower end of the control rod 4 in the assembly head 1, and the end of the control rod 4 lower end is set It is a spherical arc to ensure that the transmitted force can be concentrated at one point. The axial through hole of the storage column 14 is a stepped hole, the upper end of the stepped hole is a large-diameter end, and a compression spring 19 is arranged in the large-diameter end, and the transmission rod 16 passes through the compression spring 19 and fits in the axial through hole Among them, the upper end of the compression spring 19 is limited to the boss on the transmission rod 16, the upper end of the storage column 14 is fixedly connected to the pressure plate 2b that limits the transmission rod 16 by screws, and the upper end of the transmission rod 16 stretches out from the pressure plate 2b and is connected to the assembly head 1. The lever 4 contacts. The assembly head 1 is provided with a device for preventing the oil ring 18 from warping and deforming when it moves upwards. In this embodiment, the device for preventing the oil ring from warping and deforming when it moves upwards is set outside the assembly head 1 when it is in a free state. A round pressure plate 6a, the aperture of the pressure plate 6a is larger than the outer diameter of the free state of the oil ring, and smaller than the outer diameter of the oil ring in the expanded state. Several telescopic shafts 7 are fixedly connected to the pressure plate 6a, and the telescopic shafts 7 are connected by threads or through Conventional fixing methods such as positive fit connection are connected with the pressure plate 6a. The number of the telescopic shafts 7 is preferably 4 to 6, and the telescopic shafts 7 are connected to the support cantilever 11 provided with a relief hole, so that the pressure plate 6a is located below the support cantilever 11 and can move up and down. The support cantilever 11 is fixedly connected to the column 12 provided on the machine table 13 by bolts, and the outer circumference of the relief hole of the support cantilever 11 is uniformly provided with stepped holes with the same number as the telescopic shaft 7 . The telescopic shaft 7 is a stepped cylinder, the large-diameter end of which is connected to the pressure plate 6a is slidingly fitted with the small-diameter hole section of the stepped hole outside the circumference of the support cantilever 11, and the small-diameter end is covered with a compression spring 10, and the compression spring 10 is formed by The cover plate 9 that is arranged on the support cantilever 11 is limited, and the cover plate 9 is fixed on the upper end surface of the support swing arm 11 with bolts. The total elastic force is less than the thrust that promotes the oil ring to rise, so that the pressure plate 6a lightly pressed on the oil ring 18 can be pushed upwards with the oil ring.

The present invention is not only limited to the above-mentioned embodiment, the structure on the described assembly head 1 that stretches out the height of the control rod can also be a small-diameter section opening arranged at the upper end of the through hole, and the upper end of the control rod 4 extends from the diameter section opening. It can be seen that the boss 4a used for position-limiting in the middle section of the control rod 4 is limited by the hole shoulder of the small-diameter section.

Referring to Figure 2, it is another embodiment of the device for assembling the piston oil ring. The difference between this embodiment and the above embodiment is that the device for preventing the oil ring from warping and deforming when it moves upward is an empty sleeve The pressure plate 6b on the outer circle of the assembly head 1 is controlled by the cylinder. The inner diameter of the pressure plate 6b is larger than the outer diameter of the oil ring in the free state and smaller than the outer diameter of the oil ring in the expanded state. The pressure plate 6b is connected to the piston rod of the cylinder 20 through the connecting arm 21 Connect, the connecting arm 21 is transversely connected between the pressure plate 6b and the cylinder 20, one end is connected and fixed with the pressure plate 6b with a pin or screw, and the other end is connected with the piston rod shaft of the cylinder 20 with a pin or screw, and the shell of the cylinder 20 The body is fixed on the column 12 provided on the machine table 13 by bolts, and the downward thrust of the piston rod of the cylinder 20 is less than the upward thrust of the oil ring, so that the pressure plate 6b lightly pressed on the oil ring 18 can be pushed upward with the oil ring.

Referring to Figure 3, it is another embodiment of the device for assembling the piston oil ring. The difference between this embodiment and the above two embodiments is that the device for preventing the oil ring from warping and deforming when it moves upwards is in the form of The counterweight ring sleeve 15 that is free and empty is placed on the outer circle of the assembly head 1. The inner diameter of the counterweight ring sleeve 15 is larger than the outer diameter of the oil ring in a free state and smaller than the outer diameter of the oil ring in an expanded state. The weight ring sleeve 15 The lower end surface is provided with a notch groove for accommodating the oil ring, the depth of the notch groove is less than the height of each oil ring, and the gravity of the counterweight ring sleeve 15 is less than the thrust pushing the oil ring up, so that light pressure on the oil ring 18 The counterweight ring sleeve 15 on the top can be pushed up along with the oil ring.

When using this device to assemble the oil ring of the piston, put several stacked oil rings on the storage column, push the oil ring upwards to the assembly head by the pushing device for diameter expansion, wait for assembly, and then place the head of the piston to be installed Place it downwards in the positioning cavity on the upper end of the assembly head, so that the piston is in contact with the control rod and is in a ready state for ring installation. Press down on the piston, the piston pushes against the control rod, so that the control rod retracts downward into the through hole, and the piston contacts with the structure that positions the height of the control rod to form a positioning position. At this time, the upper side wall of the oil ring groove of the piston is exactly It is located at a position higher than the upper end surface of the assembly head, leaving a space for a piece of oil ring to be assembled into the oil ring groove, and at the same time, the control rod drives the transmission rod in the storage column downward to trigger the signaling device. The sensor of the equipment sends out an instruction, and the power transmission mechanism of the equipment drives the pushing device to push the stacked piston rings stored on the storage column to move upwards by the thickness of a piece of oil ring, and push the top piece of oil ring away from the assembly head. , the reduced diameter of the oil ring snaps into the oil ring groove of the piston, and is assembled above the existing support ring in the oil ring groove; after a piece of oil ring is assembled in the oil ring groove, the pressure on the piston is relaxed, and the control rod is compressed Return under the tension of the spring, and push the piston upward to move back to the original position, and the upper end surface of the assembly head is just at the position of the lower groove wall of the oil ring groove about higher than the piston, and the transmission rod in the storage column returns upward and disengages. Contact with the sending device, the sensor of the equipment sends another instruction, and the power transmission mechanism of the equipment drives the pushing device to push the stacked piston rings stored on the storage column to move upwards as a whole by the thickness distance of a piece of oil ring. The upper piece of oil ring is pushed into the oil ring groove of the piston and fits under the existing support ring in the oil ring groove. Thus, the up and down movement of the support rings respectively assembling the two oil rings in the oil ring grooves in sequence on one station is completed. Before the pushing device pushes the oil ring to the assembly position, since the assembly head is covered with a device to prevent the oil ring from warping and deforming when it moves upwards, that is, the pressure plate or the counterweight ring sleeve, when the oil ring is pushed up, use The device used to prevent warping and deformation of the oil ring when it moves upward is lightly pressed on the oil ring to ensure the smoothness of the oil ring. Press on the oil ring and be pushed up together to prevent the oil ring from warping and deformation. After the last piece of oil ring is installed in the oil ring groove, the device used to prevent the oil ring from warping and deforming when it moves upward presses the next piece of oil ring, thus repeatedly ensuring that each piece of oil ring will not be damaged during the assembly process. produce warping. As a result, the mechanical device is used to assemble the oil rings of the pistons of the motorcycle engine and the general gasoline engine, the assembly quality is guaranteed, and the production efficiency is improved.

Claims (10)

1. device that assembles oil piston ring, comprise the storing post, assembly head, assembly head is inverted round platform, its top has a cylindrical section, assembly head is connected storing post upper end, both curved surfaces seamlessly transit, it is characterized in that: described assembly head is connected with the storing post by threaded engagement, the cavity bottom of assembly head upper surface is provided with axial through hole, one is used for controlling the control lever telescopically that two oil rings are assemblied in the same annular groove of piston respectively successively and is arranged in the through hole, the upper and lower side of this control lever stretches out through hole respectively, the stage casing of control lever is provided with and is used for spacing boss, the through hole upper end is provided with stretches out the highly structure of location to control lever, what make control lever upper end extension stretches out the width of height less than oil ring groove on the piston, greater than the bottom of pushing out ring in the oil ring groove height to the top, the control lever hypomere is with the compression spring, the compression spring is spacing by the stopping means that the boss and the through hole lower end in control lever stage casing is provided with, be set with the device that is used to prevent buckling deformation when oil ring moves up on the assembly head, described storing post is provided with axially extending bore, one drive link is located in the axially extending bore, and the upper end of drive link contacts with control lever in the assembly head.

2. the device of the oil ring of assembling piston according to claim 1, it is characterized in that: described assembly head lower surface is provided with the boss threaded engagement that is provided with on tapped cavity and the storing post, and the through hole on the assembly head is positioned at tapped cavity top, assembly head lower surface.

3. the device of assembling oil piston ring according to claim 1, it is characterized in that: the structure that control lever is stretched out highly the location on the described assembly head is a positioning sleeve, this positioning sleeve is fastened on aperture, through hole upper end, it is overhanging that positioning sleeve is passed in the upper end of control lever, and the control lever stage casing is used for spacing boss and is subject to positioning sleeve.

4. the device of assembling oil piston ring according to claim 1, it is characterized in that: the structure that control lever is stretched out highly the location on the described assembly head is the path sector hole mouth that the through hole upper end is provided with, and the control lever stage casing is used for spacing boss and is subject to path sector hole shoulder.

5. according to the device of the arbitrary described assembling oil piston ring of claim 1～4, it is characterized in that: the stopping means of described through hole lower end is the pressing plate that is screwed through hole lower end on assembly head, and pressing plate is stretched out in the control lever lower end.

6. according to the device of the arbitrary described assembling oil piston ring of claim 1～4, it is characterized in that: the gland of the stopping means of described through hole lower end for cooperating with through hole whorl, gland is stretched out in the control lever lower end.

7. the device of assembling oil piston ring according to claim 1, it is characterized in that: describedly be used to prevent that the device of buckling deformation is the empty platen that is enclosed within the assembly head cylindrical when oil ring from moving up, the aperture of platen is greater than the external diameter of oil ring free state, external diameter less than the oil ring expansion state, be fixedly connected with a plurality of telescopic shafts on the platen, telescopic shaft is connected with the supporting cantilever that is provided with resigning hole, make platen be positioned at supporting cantilever below and can move up and down, supporting cantilever is fixedly connected on the column that is provided with on the lathe table top, described telescopic shaft is the ladder cylinder, its bigger diameter end shoulder hole outer with being arranged on supporting cantilever resigning hole circumference that connects platen is slidingly matched, its miner diameter end is with the compression spring, the compression spring is spacing by the cover plate that is arranged on the supporting cantilever, and the total elastic force of a plurality of compression springs is less than promoting the thrust that oil ring rises.

8. the device of assembling oil piston ring according to claim 1, it is characterized in that: describedly be used to prevent that the device of buckling deformation is the empty platen by cylinder control that is enclosed within the assembly head cylindrical when oil ring from moving up, platen internal diameter greater than the external diameter of oil ring free state, external diameter less than the oil ring expansion state, platen is connected with cylinder by linking arm, cylinder is fixed on the column that is provided with on the lathe table top, and the downward thrust of cylinder is less than promoting the thrust that oil ring rises.

9. the device of assembling oil piston ring according to claim 1, it is characterized in that: describedly be used to prevent that the device of buckling deformation is to be the counterweight ring set that free shape sky is enclosed within the assembly head cylindrical when oil ring from moving up, the internal diameter of described counterweight ring set is greater than the external diameter of oil ring free state, external diameter less than the oil ring expansion state, the lower surface of counterweight ring set has the seam groove that is used to hold oil ring, the degree of depth of seam groove is less than the height of every oil ring, and the gravity of described counterweight ring set is less than promoting the thrust that oil ring rises.

10. the device of assembling oil piston ring according to claim 1, it is characterized in that: the axially extending bore of described storing post is a shoulder hole, the upper end of shoulder hole is a bigger diameter end, be provided with the compression spring in this bigger diameter end, drive link passes the compression gapping of spring and is engaged in the axially extending bore, compression spring upper end is limited in the boss on the drive link, the fixedly connected pressing plate spacing on the storing post to drive link, and the upper end of drive link is stretched out pressing plate and is contacted with control lever on the assembly head.