CN217401341U

CN217401341U - Piston assembly with long service life and low loss

Info

Publication number: CN217401341U
Application number: CN202220987149.3U
Authority: CN
Inventors: 王辉; 吴丽萍; 郭伟波; 黄世芳; 马辉; 马龙辉
Original assignee: Zhejiang Hengcheng Cemented Carbide Co Ltd
Current assignee: Zhejiang Hengcheng Cemented Carbide Co Ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2022-09-09
Anticipated expiration: 2032-04-25

Abstract

The utility model relates to a piston technical field specifically is a piston assembly of high life low loss, and it includes piston and drive arrangement, drive arrangement include at least one moving gear and with the fixed gear of moving gear internal gearing, the fixed gear has the ring gear, the tooth ratio of moving gear and fixed gear is 1:2, the one end of piston is fixed with the piston rod, the one end of piston rod is connected with the rotation of a point on the reference circle of moving gear, the direction of motion of piston rod is parallel with the terminal surface of moving gear. The internal meshing of the moving gear and the fixed gear is realized, the radius ratio is 1:2, the hypocycloid is ensured to be a straight line when the moving gear moves, the motion track of the connecting point of the piston rod and the moving gear is also a straight line, the force transmitted to the piston rod by the moving gear is only the force along the reciprocating motion direction, and no force in other directions exists, so that the friction loss between the piston rod and the side wall of the piston rod is reduced, and the service life of the piston is prolonged.

Description

Piston assembly with long service life and low loss

Technical Field

The utility model belongs to the technical field of the piston technique and specifically relates to a piston assembly of high life low loss is related to.

Background

The piston rod is a connecting part for supporting the piston to do work, most of the piston rod is applied to an oil cylinder and an air cylinder movement execution part, the piston rod is a movement part with frequent movement and high technical requirements, the hydraulic oil cylinder is taken as an example and consists of a cylinder barrel, a piston rod, a piston and an end cover, the service life and the reliability of the whole product are directly influenced by the quality of the processing quality of the piston rod, the processing requirement of the piston rod is high, the surface roughness requirement of the piston rod is Ra0.4-0.8 mu m, and the requirements on coaxiality and wear resistance are strict.

For example, chinese utility model patent with application number 202121517764.X discloses a long service life's antifriction piston rod, including piston rod and pressure release mechanism, pressure release mechanism comprises connecting piece, retaining ring, round pin axle and bearing block, and the left end fixed mounting of piston rod has the stress end, and pressure release mechanism's right side fixed mounting has the piston. Although the friction-resistant piston rod with long service life uses rolling to replace relative sliding, friction still exists, and the problem of friction between the piston rod and the side wall is not solved from the source.

Disclosure of Invention

The utility model aims at providing a piston assembly of high life low loss through intermeshing's gear, offsets the power of other directions beyond the piston reciprocating motion direction for piston rod and lateral wall do not have the relative motion of slip ground, and the loss of the piston rod lateral wall that significantly reduces improves piston life.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a piston assembly with long service life and low loss is characterized by comprising a piston and a driving device, wherein the driving device comprises at least one moving gear and a fixed gear meshed with the moving gear, the fixed gear is provided with an inner gear ring, the gear ratio of the moving gear to the fixed gear is 1:2, a piston rod is fixed at one end of the piston, the piston rod is rotatably connected with the moving gear, the axis of the piston rod rotatably connected with the moving gear is positioned on the reference circle of the moving gear and is parallel to the axis of the moving gear, and the movement direction of the piston rod is parallel to the end face of the moving gear. The internal meshing of the moving gear and the fixed gear is realized, the radius ratio is 1:2, the hypocycloid is ensured to be a straight line when the moving gear moves, the motion track of the connecting point of the piston rod and the moving gear is also a straight line, the force transmitted to the piston rod by the moving gear is only the force along the reciprocating motion direction, and no force in other directions exists, so that the friction loss between the piston rod and the side wall of the piston rod is reduced, and the service life of the piston is prolonged.

Preferably, the moving gear and the fixed gear are straight gears, a mandrel for driving the moving gear is arranged at the center of the moving gear, and the mandrel penetrates through the moving gear. The internal meshing straight gear transmission of moving gear and fixed gear for axial force is not transmitted during the transmission, when transmitting to piston department, reduces the piston along the axial power of dabber, further reduces the friction loss between the lateral wall of piston rod and piston rod, thereby increases piston life.

Preferably, the mandrel is connected with a connecting rod, one end of the connecting rod is fixed with the mandrel, the other end of the connecting rod is hinged with the piston rod, and a hinged point is located on a graduated circle of the moving gear. The connecting rod is hinged with the piston rod to form a structure that one end of the piston rod is rotationally connected with one point on the reference circle of the moving gear, the connecting rod is used for transmitting power, and the fact that the piston rod is directly connected with one point on the reference circle of the moving gear in a rotating mode cannot be achieved, so that the theoretical position of the reference circle is reflected in the real object position through the connecting rod which is long enough, and therefore the moving gear is connected with the piston rod.

Preferably, the driving device comprises a rotating part which is used for driving the moving gear to move in a meshing manner with the fixed gear. The rotating piece is used as a power source and provides power for rotating the moving gear.

Preferably, one end of the mandrel is fixed with the connecting rod, and the other end of the mandrel is connected with the rotating piece. The mandrel is used for transmitting the power provided by the rotating part to the moving gear and the connecting rod at the same time, and the connecting rod and the piston rod rotate relatively while the moving gear and the fixed gear are driven to be meshed.

Preferably, the mandrel is connected with the moving gear through a first key, the mandrel is connected with the rotating member through a second key, and the first key and the second key are distributed at an angle of 180 degrees. The two keys distributed on the mandrel reduce the weakening of the strength of the shaft in a 180-degree distribution mode, so that the shaft can absorb torsional circumferential force, the force is prevented from being transmitted to the piston rod, the original movement track of the piston rod is deviated, the friction loss between the piston rod and the side wall of the piston rod is further reduced, and the service life of the piston is prolonged.

Preferably, the rotating member rotates in the same direction as the moving gear, and the rotating member is close to the moving gear. The rotating piece is close to the moving gear to reduce couple along the axial direction, so that friction loss between the piston rod and the side wall of the piston rod is further reduced, and the service life of the piston is prolonged.

Preferably, the rotating part comprises a balancing weight, the balancing weight is located on one side of a rotating center of the rotating part, and the connecting parts of the rotating part and the mandrel are located on the other side of the rotating center of the rotating part respectively. The balancing weight is used for balancing the rotating center at the centroid when rotating, so that the rotating couple is prevented from influencing the piston rod, the loss is further reduced, and the service life is prolonged.

The utility model has the advantages that: reduce the atress from other directions beyond piston rod reciprocating motion, thereby reduce the influence of external force and avoid piston rod unnecessary friction, improve piston life: the internal engagement straight gear transmission is adopted, so that the axial force borne by the piston rod is reduced; the gear diameter ratio of 1:2 is adopted, so that the radial force borne by the piston rod is reduced; and the counter weight is used, so that the influence of the rotational inertia of gear transmission is eliminated.

Drawings

Fig. 1 is a side axial view of the rotating member of the piston assembly with long service life and low loss of the present invention.

Fig. 2 is a side view of the piston rod of the piston assembly with long service life and low loss.

Fig. 3 is a side view of the high life low loss piston assembly of the present invention.

Detailed Description

The invention will be further described with reference to the drawings and the specific embodiments.

From fig. 1, 2 and 3, a piston assembly with long service life and low loss comprises a piston 1 and a driving device, wherein a piston rod 2 is fixed at one end of the piston 1, the driving device comprises a connecting rod 3, a pair of internal engaged moving gear 4 and fixed gear 5, the fixed gear 5 is provided with an internal gear ring, the gear ratio of the moving gear to the fixed gear is 1:2, a mandrel 6 for driving the moving gear 4 is arranged at the center of the moving gear 4, the mandrel 6 penetrates through the moving gear 4, one end of the connecting rod 3 is fixedly connected with the mandrel 6, the other end of the connecting rod 3 is hinged with the piston rod 2, and a hinged point is positioned on a graduated circle of the moving gear 4.

The gear 4 is internally meshed with the fixed gear 5, the radius ratio is 1:2, the hypocycloid is ensured to be a straight line when the movable gear 4 moves, the connecting rod 3 is fixed with the mandrel 6 of the movable gear 4, therefore, the motion track of the hinged point of the connecting rod 3 and the piston rod 2 is also a straight line, after the motion track of the hinged point of the connecting rod 3 and the piston rod 2 is set, the force transmitted to the piston rod 2 by the movable gear 4 is only the force along the reciprocating motion direction, no force in other directions exists, the friction loss between the piston rod 2 and the side wall of the piston rod 2 is further reduced, and the service life of the piston is prolonged.

As shown in fig. 1 or 2, the moving gear 4 and the fixed gear 5 are spur gears that mesh with each other, and the moving gear 4 is located inside the fixed gear 5. The internal meshing straight gear transmission of moving gear 4 and fixed gear 5 for do not transmit axial force during the transmission, when transmitting to piston department, reduce the piston along 6 axial power of dabber, further reduce the friction loss between the lateral wall of piston rod 2 and piston rod 2, thereby increase piston life.

As shown in fig. 1, 2 and 3, the driving device includes a rotating member 7, the rotating member 7 is used for driving the moving gear 4 and the fixed gear 5 to move in a meshing manner, one end of the mandrel 6 is fixed to the connecting rod 3, and the other end of the mandrel 6 is connected with the rotating member 7. The mandrel 6 is used for simultaneously transmitting the power provided by the rotating piece 7 to the moving gear 4 and the connecting rod 3, and the connecting rod 3 and the piston rod 2 rotate relatively while the moving gear 4 is driven to be meshed with the fixed gear 5.

As shown in fig. 1 and 3, the spindle 6 is connected with the moving gear 4 through a first key 8, the spindle 6 is connected with the rotating member 7 through a second key 9, and the first key 8 and the second key 9 are distributed at 180 degrees. Two keys distributed on the mandrel 6 reduce the weakening of the strength of the shaft in a 180-degree distribution mode, so that the shaft can absorb torsional circumferential force, the force is prevented from being transmitted to the piston rod 2, the piston rod 2 deviates from the original motion track, the friction loss between the piston rod 2 and the side wall of the piston rod 2 is further reduced, and the service life of the piston is prolonged.

As shown in fig. 2 and 3, the rotating member 7 rotates in the same direction as the moving gear 4, and the rotating member 7 approaches the moving gear 4. The rotating part 7 is close to the moving gear 4 to reduce couple along the axial direction, so that the friction loss between the piston rod 2 and the side wall of the piston rod 2 is further reduced, and the service life of the piston is prolonged.

As shown in fig. 1, the rotating member 7 includes a weight block 10, the weight block 10 is located on one side of the rotation center of the rotating member 7, and the connection points of the rotating member 7 and the spindle 6 are located on the other side of the rotation center of the rotating member 7. The balancing weight 10 is used for balancing the center of rotation in the centroid during rotation, preventing the rotating couple from influencing the piston rod 2, further reducing the loss and prolonging the service life.

In this embodiment, before using, with moving gear 4 preinstallation, control piston rod 2 is located the vertical central line of fixed gear 5 with the pin joint of connecting rod 3, when using, the output shaft of external motor rotates the center of rotation of piece 7, it rotates to rotate piece 7 and drives moving gear 4 and connecting rod 3 and rotate, connecting rod 3 and the articulated department of piston rod 2 are reciprocating motion on the vertical central line of fixed gear 5 all the time, and there is not relative slip on the lateral wall of piston rod 2 and piston 1, reduce the friction with this, greatly increased piston 1's life.

Claims

1. A piston assembly with long service life and low loss is characterized by comprising a piston and a driving device, wherein the driving device comprises at least one moving gear and a fixed gear meshed with the moving gear, the fixed gear is provided with an inner gear ring, the gear ratio of the moving gear to the fixed gear is 1:2, a piston rod is fixed at one end of the piston, the piston rod is rotatably connected with the moving gear, the axis of the piston rod rotatably connected with the moving gear is positioned on the reference circle of the moving gear and is parallel to the axis of the moving gear, and the movement direction of the piston rod is parallel to the end face of the moving gear.

2. The piston assembly with long service life and low loss as claimed in claim 1, wherein the moving gear and the fixed gear are straight gears, a mandrel for driving the moving gear is arranged at the center of the moving gear, and the mandrel penetrates through the moving gear.

3. A long-life low-loss piston assembly as claimed in claim 2, wherein said mandrel is connected to a connecting rod, one end of said connecting rod is fixed to said mandrel, the other end of said connecting rod is hinged to said piston rod, and the hinge point is located on the pitch circle of said moving gear.

4. A long-life low-loss piston assembly as claimed in claim 2, wherein said drive means includes a rotary member for driving said movable gear into meshing motion with said fixed gear.

5. The piston assembly of claim 4 wherein one end of said mandrel is fixed to said connecting rod and the other end of said mandrel is connected to said rotor.

6. The piston assembly of claim 5 wherein the spindle is connected to the moving gear by a first key and the spindle is connected to the rotating gear by a second key, the first key and the second key being disposed at 180 °.

7. A long life low loss piston assembly as claimed in claim 5 or 6, wherein said rotating member rotates in the same direction as said moving gear, said rotating member being adjacent to said moving gear.

8. The high life, low loss piston assembly of claim 7 wherein said rotating member includes a weight disposed on one side of the center of rotation of said rotating member, the connection of said rotating member to said spindle being disposed on the other side of the center of rotation of said rotating member.