Piston guide, piston cylinder and engine

Abstract

This invention relates to the field of piston guiding technology, and discloses a piston guiding device, a piston cylinder, and an engine. The piston guiding device includes a connecting structure and an elastic structure. The elastic structure includes a first elastic component and a second elastic component. The first elastic component only bears the tensile force generated when the piston rod moves relative to the connecting structure, and the second elastic component only bears the tensile force generated when the connecting structure moves relative to the cylinder. This distributes the larger tensile force generated by the relative movement of the piston rod and cylinder onto the first and second elastic components, ensuring that the elastic deformation of both components is within their respective tolerance ranges. This reduces the likelihood of fatigue in the first and second elastic components, allowing them to adapt to longer stroke conditions with fewer limitations.

Description

Technical Field

[0001] This invention relates to the field of piston guiding technology, and more specifically to a piston guiding device, piston cylinder, and engine. Background Technology

[0002] Piston cylinders are commonly used mechanical components with wide applications in energy conversion and recovery. Free-piston cylinders, because they do not require a conversion device to convert the linear motion of the piston rod into rotational motion, have advantages such as simple structure and high efficiency. Meanwhile, free-piston rod engines, as a clean and versatile power plant, have become a research hotspot worldwide.

[0003] As a guiding device, the leaf spring is a key component inside a piston rod engine. Located within the piston cylinder, it guides and supports the piston rod, providing radial support to prevent lateral deviation. The center of the leaf spring connects to the piston rod, and its edge connects to the inner wall of the cylinder. When the piston rod moves relative to the cylinder, the leaf spring undergoes elastic deformation under the tension generated by the relative movement of the piston rod and cylinder, providing axial restoring force and a certain stroke to the piston rod, thus ensuring that the piston rod can perform reciprocating linear motion.

[0004] When the piston rod has a large stroke, the relative displacement between the piston rod and the cylinder is large, which makes the elastic deformation of the leaf spring large. This makes the leaf spring prone to fatigue, which in turn reduces the strength and function of the leaf spring. If the fatigue strength factor of the leaf spring is considered, the leaf spring can only be used in working conditions with a small piston rod stroke, which is very limited. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem that leaf springs in the prior art are prone to fatigue and cannot be used for the long stroke conditions of piston rods, and to provide a piston guide device, piston cylinder and engine. The piston guide device can reduce the tension applied to a single elastic component and can be used for the long stroke conditions of piston rods.

[0006] To achieve the above objectives, the present invention provides a piston guide device that can be disposed within the cylinder of a piston cylinder. The piston guide device includes: a connecting structure that is movably disposed relative to the cylinder; and an elastic structure that includes: a first elastic component that connects the connecting structure to a piston rod, such that the tension exerted on the first elastic component by the connecting structure and the piston rod when they move relative to each other is converted into elastic deformation of the first elastic component; and a second elastic component that connects the connecting structure to the cylinder, such that the tension exerted on the second elastic component by the connecting structure and the cylinder when they move relative to each other is converted into elastic deformation of the second elastic component.

[0007] Preferably, the connecting structure includes multiple connecting rods, which are spaced apart circumferentially along the piston rod. The connecting rods are parallel to the piston rod and can move in the same direction as the piston rod under the action of the piston rod's movement; and / or, the first elastic component and the second elastic component are located on the same side of the connecting structure, so that the connecting structure can move in a direction opposite to and perpendicular to the piston rod under the thrust generated by the elastic deformation of the first elastic component and the second elastic component.

[0008] Preferably, the first elastic component and the second elastic component are spaced apart along the moving direction of the connecting structure; and / or, the first elastic component and the second elastic component both have an included angle with the connecting structure, and the first elastic component and the second elastic component both form an included angle with the piston rod.

[0009] Preferably, the first elastic component includes a first spring plate, one end of which is connected to the connecting structure, and the other end of which can be connected to the piston rod; and / or, the second elastic component includes a second spring plate, one end of which is connected to the connecting structure, and the other end of which can be connected to the cylinder body.

[0010] Preferably, the first elastic component includes a plurality of first spring plates, which are arranged circumferentially around the piston rod to limit the direction of movement of the piston rod; and / or, the second elastic component includes a plurality of second spring plates, which are arranged circumferentially around the piston rod to limit the direction of movement of the piston rod.

[0011] Preferably, the first spring plate includes a first connecting segment, a first intermediate segment, and a second connecting segment connected in sequence, the first intermediate segment being inclined relative to the first connecting segment and the second connecting segment, the first connecting segment being connected to a connecting structure, and the second connecting segment being able to be connected to a piston rod; and / or, the second spring plate includes a third connecting segment, a second intermediate segment, and a fourth connecting segment connected in sequence, the second intermediate segment being inclined relative to the third connecting segment and the fourth connecting segment, the third connecting segment being connected to a connecting structure, and the fourth connecting segment being able to be connected to a cylinder body.

[0012] Preferably, the extension line of the first intermediate segment has an angle with the connecting structure, the angle being α, where 0° < a < 90° or 90° < a < 180°; the extension line of the first intermediate segment has an angle with the piston rod, the angle being β, where 0° < b < 90° or 90° < b < 180°; and / or, the extension line of the second intermediate segment has an angle with the connecting structure, the angle being β, where 0° < c < 90° or 90° < c < 180°; the extension line of the second intermediate segment has an angle with the piston rod, the angle being d, where 0° < d < 90° or 90° < d < 180°.

[0013] Preferably, the included angles a and c are not equal, and the included angles b and d are not equal; or, the lengths of the first intermediate segment and the second intermediate segment are the same, and the included angles a and c are complementary angles, and the included angles b and d are complementary angles.

[0014] A second aspect of the present invention provides a piston cylinder, including a cylinder body, a piston rod disposed within the cylinder body, and the aforementioned piston guide device.

[0015] A third aspect of the present invention provides an engine, including a housing and the aforementioned piston cylinder, the piston cylinder being disposed within the housing.

[0016] The above technical solution adds a connecting structure and divides the elastic structure into a first elastic component and a second elastic component. The first elastic component connects the piston rod to the connecting structure, and the second elastic component connects the cylinder to the connecting structure. The relative displacement between the piston rod and the cylinder is decomposed into the relative displacement between the piston rod and the connecting structure, and the relative displacement between the connecting structure and the cylinder. The first elastic component only bears the tensile force generated when the piston rod and the connecting structure move relative to each other, and the second elastic component only bears the tensile force generated when the connecting structure and the cylinder move relative to each other. This distributes the larger tensile force generated by the relative movement of the piston rod and the cylinder onto the first and second elastic components, ensuring that the elastic deformation of both components is within their own tolerance range. This makes the first and second elastic components less prone to fatigue, allowing them to adapt to longer stroke conditions with fewer limitations. Attached Figure Description

[0017] Figure 1 This is a front view of the piston guide device of the present invention in cooperation with the piston and cylinder;

[0018] Figure 2 This is a front view of the elastic structure undergoing elastic deformation when the connecting rod in the piston guide device moves in the direction of the arrow.

[0019] Figure 3 This is a front view of the first spring plate of the piston guide device; and

[0020] Figure 4 This is a front view of the second spring plate of the piston guide device.

[0021] Explanation of reference numerals in the attached figures

[0022] 10. Connecting structure; 11. Connecting rod; 20. Elastic structure; 21. First elastic component; 211. First spring plate; 2111. First connecting section; 2112. First spring section; 2113. Second connecting section; 22. Second elastic component; 221. Second spring plate; 2211. Third connecting section; 2212. Second intermediate section; 2213. Fourth connecting section; 30. Mounting structure; 31. First connecting plate; 32. Second connecting plate; 91. Piston rod; 92. Cylinder body. Detailed Implementation

[0023] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0024] See Figures 1 to 4 As shown, the present invention provides a piston guide device that can be disposed within the cylinder body 92 of a piston cylinder. The piston guide device includes: a connecting structure 10, which is movably disposed relative to the cylinder body 92; and an elastic structure 20, which includes: a first elastic component 21, which connects the connecting structure 10 and the piston rod 91 to convert the tension exerted on the first elastic component 21 by the connecting structure 10 and the piston rod 91 during relative movement into elastic deformation of the first elastic component 21; and a second elastic component 22, which connects the connecting structure 10 and the cylinder body 92 to convert the tension exerted on the second elastic component 22 by the connecting structure 10 and the cylinder body 92 during relative movement into elastic deformation of the second elastic component 22.

[0025] In this embodiment, when the piston rod 91 moves axially, the piston rod 91 drives the connecting structure 10 to move in the same direction through the first elastic component 21, so that the connecting structure 10 and the cylinder 92 move relative to each other. At the same time, the connecting structure 10 is constrained by the cylinder 92 through the second elastic component 22, so that the connecting structure 10 and the piston rod 91 move relative to each other. The tension on the first elastic component 21 is generated by the relative movement between the connecting structure 10 and the piston rod 91, and the tension on the second elastic component 22 is generated by the relative movement between the connecting structure 10 and the cylinder 92. The relative displacement between the piston rod 91 and the cylinder 92 is the sum of the relative displacement between the connecting structure 10 and the piston rod 91 and the relative displacement between the connecting structure 10 and the cylinder 92. This allows the tension that should have been borne by a single leaf spring in the prior art to be distributed to the first elastic component 21 and the second elastic component 22. The sum of the tension that the two elastic components can withstand is greater than the tension that a single leaf spring can withstand. Therefore, the elastic structure 20, including the first elastic component 21 and the second elastic component 22, can withstand greater tension, and the stroke of the piston rod 91 can be extended, with fewer limitations.

[0026] Specifically, the connecting structure 10 is suspended inside the cylinder 92, and the piston rod 91 is connected to the cylinder 92 through the entire piston guide device, so that the piston rod 91 and the cylinder 92 have a non-frictional fit relationship, which can be applied to piston cylinders without lubricating oil and there is no problem of lubricating oil contamination.

[0027] See Figures 1 to 4 As shown, in some embodiments of the present invention, the connecting structure 10 includes a plurality of connecting rods 11, which are spaced apart circumferentially along the piston rod 91. The connecting rods (11) are parallel to the piston rod (91), and the connecting rods 11 can move in the same direction as the piston rod 91 under the action of the piston rod 91.

[0028] In this embodiment, the axial direction of the connecting rod 11 is parallel to the axial direction of the piston rod 91, and the piston rod 91 can be subjected to the reaction force of the first elastic component 21 on the connecting rod 11 in the circumferential direction, so that the movement direction of the piston rod 91 is limited to its axial direction only.

[0029] Specifically, the number of connecting rods 11 is an even number, such as four. To ensure uniform circumferential force on the piston rod 91, this force is the reaction force applied by the first elastic component 21. Every two connecting rods 11 are symmetrically arranged along the piston rod 91. The first elastic component 21 on the two symmetrical connecting rods 11 applies the same reaction force to the piston rod 91 in opposite directions, which can cancel each other out. This prevents the piston rod 91 from being subjected to forces other than its own axial force, ensuring that the piston rod 91 can always move along its axial direction without any deviation in other directions.

[0030] See Figures 1 to 4 As shown, in some embodiments of the present invention, the first elastic component 21 and the second elastic component 22 are located on the same side of the connecting structure 10, so that the connecting structure 10 can move in a direction opposite to and perpendicular to the piston rod 91 under the thrust generated by the elastic deformation of the first elastic component 21 and the second elastic component 22.

[0031] In this embodiment, with Figure 1 The orientation shown is for reference. The first elastic component 21 and the second elastic component 22 are both located between the piston rod 91 and the connecting rod 11, so that the connecting rod 11 can move horizontally in a direction away from the piston rod 91. When the first elastic component 21 and the second elastic component 22 are stretched under tension, the connecting rod 11 can reduce or eliminate the change in length of the first elastic component 21 and the second elastic component 22 by moving horizontally, thereby reducing the elastic deformation amplitude of the first elastic component 21 and the second elastic component 22, increasing their fatigue resistance, and extending their service life.

[0032] See Figures 1 to 4As shown, in some embodiments of the present invention, the first elastic component 21 and the second elastic component 22 are spaced apart along the moving direction of the connecting structure 10.

[0033] Specifically, multiple first elastic components 21 and second elastic components 22 are provided, for example, four. Each first elastic component 21 is connected to all the connecting rods 11, and each second elastic component 22 is connected to all the connecting rods 11, so that the first elastic components 21 and second elastic components 22 can adapt to multiple connecting rods 11 arranged on the outer periphery of the piston rod 91 to guide the piston rod 91. The first elastic components 21 and second elastic components 22 are arranged sequentially at intervals along the axial direction of the connecting rods 11.

[0034] In other embodiments, one of the number of the first elastic component 21 and the number of the second elastic component 22 is multiple, and the sum of the two is greater than or equal to three.

[0035] See Figures 1 to 4 As shown, in some embodiments of the present invention, the first elastic component 21 and the second elastic component 22 both have an included angle with the connecting structure 10, and the first elastic component 21 and the second elastic component 22 both form an included angle with the piston rod 91.

[0036] In this embodiment, the first elastic component 21 connects the piston rod 91 to the connecting structure 10. Therefore, an angle must be formed between the first elastic component 21 and the connecting structure 10, as well as between the first elastic component 21 and the piston rod 91; otherwise, the function of the first elastic component 21 cannot be realized. Similarly, the second elastic component 22 connects the cylinder body 92 to the connecting structure 10. Therefore, an angle must be formed between the second elastic component 22 and the connecting structure 10; otherwise, the function of the second elastic component 22 cannot be realized. Since the connecting structure 10 is parallel to the piston rod 91, an angle is also formed between the second elastic component 22 and the piston rod 91.

[0037] See Figures 1 to 4 As shown, in some embodiments of the present invention, the first elastic component 21 includes a first spring sheet 211, one end of which is connected to the connecting structure 10, and the other end of which can be connected to the piston rod 91. The second elastic component 22 includes a second spring sheet 221, one end of which is connected to the connecting structure 10, and the other end of which can be connected to the cylinder 92.

[0038] In this embodiment, both the first spring plate 211 and the second spring plate 221 are sheet-like structures that can undergo large elastic deformation, enabling the first spring plate 211 and the second spring plate 221 to adapt to the working conditions of the piston rod 91 with a large stroke.

[0039] See Figures 1 to 4 As shown, in some embodiments of the present invention, the first elastic component 21 includes a plurality of first spring plates 211, which are arranged at intervals along the circumference of the piston rod 91 to limit the movement direction of the piston rod 91. The second elastic component 22 includes a plurality of second spring plates 221, which are arranged at intervals along the circumference of the piston rod 91 to limit the movement direction of the piston rod 91.

[0040] In this embodiment, the first spring plates 211 are evenly spaced along the circumference of the piston rod 91, so that the reaction forces of all the first spring plates 211 on the piston rod 91 can cancel each other out, avoiding the piston rod 91 from being subjected to forces other than its own axial force, and ensuring that the piston rod 91 always moves along the axial direction; similarly, the second spring plates 221 are evenly spaced along the axial direction of the piston rod 91, so that the indirect reaction forces of all the second spring plates 221 on the piston rod 91 through the connecting rod 11 can cancel each other out, avoiding the piston rod 91 from being subjected to forces other than its own axial force, and ensuring that the piston rod 91 always moves along the axial direction.

[0041] Specifically, the first spring plates 211 in each first elastic component 21 are evenly spaced along the outer periphery of the piston rod 91, and the first spring plates 211 of every two adjacent first elastic components 21 overlap in the top view direction. The second spring plates 221 in each second elastic component 22 are also evenly spaced along the outer periphery of the piston rod 91, and the second spring plates 221 of every two adjacent second elastic components 22 overlap in the top view direction.

[0042] See Figures 1 to 4 As shown, in some embodiments of the present invention, the first spring plate 211 includes a first connecting segment 2111, a first intermediate segment 2112, and a second connecting segment 2113 connected in sequence. The first intermediate segment 2112 is inclined relative to the first connecting segment 2111 and the second connecting segment 2113. The first connecting segment 2111 is connected to the connecting structure 10, and the second connecting segment 2113 can be connected to the piston rod 91. The second spring plate 221 includes a third connecting segment 2211, a second intermediate segment 2212, and a fourth connecting segment 2213 connected in sequence. The second intermediate segment 2212 is inclined relative to the third connecting segment 2211 and the fourth connecting segment 2213. The third connecting segment 2211 is connected to the connecting structure 10, and the fourth connecting segment 2213 can be connected to the cylinder 92.

[0043] In this embodiment, the first connecting segment 2111, the second connecting segment 2113, the third connecting segment 2211, and the fourth connecting segment 2213 are all horizontally arranged. The first intermediate segment 2112 and the second intermediate segment 2212, as the main parts that undergo elastic deformation, are inclined. Compared with the horizontal arrangement, the inclined first intermediate segment 2112 can withstand a larger relative displacement between the connecting rod 11 and the piston rod 91. Similarly, the inclined second intermediate segment 2212 can withstand a larger relative displacement between the connecting rod 11 and the cylinder 92. This allows the first spring plate 211 and the second spring plate 221 to be suitable for working conditions with a larger stroke of the piston rod 91.

[0044] like Figure 2 As shown, when the piston rod 91 moves upward, the connecting rod 11 moves downward relative to the piston rod 91. The first connecting section 2111 and the second connecting section 2113 are subjected to force first. The first connecting section 2111 is curved in an arc shape and transmits the force to the first intermediate section 2112. The first intermediate section 2112 gradually curves in an arc shape from its connection end with the first connecting section 2111 towards the middle. The second connecting section 2113 is curved in an arc shape and transmits the force to the first intermediate section 2112. The first intermediate section 2112 gradually curves in an arc shape from its connection end with the second connecting section 2113 towards the middle. This causes the bending of the first spring plate 211 to accumulate in the length direction, forming an "S"-shaped elastic deformation. Simultaneously, connecting rod 11 moves upward relative to cylinder 92. The third connecting section 2211 and the fourth connecting section 2213 are initially subjected to force. The third connecting section 2211 curves upward in an arc, simultaneously transmitting force to the second intermediate section 2212. The second intermediate section 2212 gradually curves upward in an arc from its connection point with the third connecting section 2211 towards the center. The fourth connecting section 2213 curves downward in an arc, simultaneously transmitting force to the second intermediate section 2212. The second intermediate section 2212 gradually curves downward in an arc from its connection point with the fourth connecting section 2213 towards the center. This causes the bending of the second spring plate 221 to accumulate along its length, forming an "S"-shaped elastic deformation. The shapes formed by the elastic deformation of the first spring plate 211 and the second spring plate 221 are symmetrical on the horizontal plane.

[0045] Specifically, the first connecting segment 2111, the first intermediate segment 2112, and the second connecting segment 2113 are integral structures, as are the third connecting segment 2211, the second intermediate segment 2212, and the fourth connecting segment 2213. Both are "Z"-shaped structures. The first spring sheet 211 and the second spring sheet 221 are formed by bending the edge of an elastic sheet structure. The structure is simple and easy to process. The sheet structure can be rectangular or other regular shapes that are close to rectangular, avoiding obvious stress concentration and greatly improving the stress on the first spring sheet 211 and the second spring sheet 221.

[0046] Specifically, the piston guide device also includes a mounting structure 30, which includes a first connecting plate 31 and a second connecting plate 32. The first connecting plate 31 is connected to the outer periphery of the piston rod 91. The first connecting plate 31 can be a ring plate sleeved on the outer periphery of the piston rod 91, or it can be multiple plate structures evenly spaced along the circumference of the piston rod 91. When the first connecting plate 31 is multiple plate structures, the number of plate structures is the same as the number of first spring plates 211, and the two correspond one-to-one. The first spring plates 211 are connected to the piston rod 91 through the first connecting plate 31. The second connecting section 2113 of the first spring plate 211 is parallel to the first connecting plate 31. On the one hand, this facilitates the second connecting section 2113 to bear the tension of the piston rod 91; on the other hand, it makes the connection between the second connecting section 2113 and the first connecting plate 31 more secure, thereby preventing the first spring plate 211 from detaching from the first connecting plate 31 during the process of being stressed. The second connecting plates 32 are evenly arranged along the inner wall of the cylinder 92. The number of the second connecting plates 32 is the same as the number of the second spring plates 221, and they correspond one-to-one. The second spring plates 221 are connected to the cylinder 92 through the second connecting plates 32. The fourth connecting segment 2213 of the second spring plate 221 is parallel to the second connecting plate 32. On the one hand, it is convenient for the fourth connecting segment 2213 to bear the tension of the cylinder 92. On the other hand, it makes the connection between the fourth connecting segment 2213 and the second connecting plate 32 more secure, thereby preventing the second spring plate 221 from detaching from the second connecting plate 32 during the process of being stressed.

[0047] Specifically, the first spring plate 211 and the second spring plate 221 can be exactly the same or different. When they are different, in Figure 1In the indicated orientation, the horizontal dimensions of the first spring plate 211 are the same as those of the second spring plate 221. In other embodiments, the first spring plate 211 includes only a first intermediate section 2112, with its two ends connected to the piston rod 91 and the connecting rod 11, respectively. The second spring plate 221 includes only a second intermediate section 2212, with its two ends connected to the piston rod 91 and the cylinder 92, respectively. When the piston rod 91 moves upward, the connecting rod 11 moves downward relative to the piston rod 91. The two ends of the first intermediate section 2112 are simultaneously subjected to force. The first intermediate section 2112 gradually curves in an arc from the end connected to the connecting rod 11 towards the center, and gradually curves in an arc from the end connected to the piston rod 91 towards the center. This causes the bending of the first intermediate section 2112 to accumulate along its length, forming an "S"-shaped elastic deformation. Simultaneously, the connecting rod 11 moves upward relative to the cylinder 92, and both ends of the second intermediate section 2212 are simultaneously subjected to force. The second intermediate section 2212 gradually curves upward from the end connected to the connecting rod 11 towards the center, and gradually curves downward from the end connected to the cylinder 92 towards the center, causing the bending of the second intermediate section 2212 to accumulate in the length direction, forming an "S"-shaped elastic deformation. The shapes formed by the elastic deformation of the first intermediate section 2112 and the second intermediate section 2212 are symmetrical on the horizontal plane.

[0048] See Figures 1 to 4 As shown, in some embodiments of the present invention, the extension line of the first intermediate segment 2112 and the connecting structure 10 form an angle α, where 0° < a < 90° or 90° < a < 180°; the extension line of the first intermediate segment 2112 and the piston rod 91 form an angle b, where 0° < b < 90° or 90° < b < 180°; the extension line of the second intermediate segment 2212 and the connecting structure 10 form an angle c, where 0° < c < 90° or 90° < c < 180°; the extension line of the second intermediate segment 2212 and the piston rod 91 form an angle d, where 0° < d < 90° or 90° < d < 180°.

[0049] In this embodiment, the first intermediate segment 2112 and the second intermediate segment 2212 form an angle with the horizontal line, meaning that neither the first intermediate segment 2112 nor the second intermediate segment 2212 is perpendicular to the connecting rod 11. Compared to a perpendicular arrangement, the non-perpendicular first intermediate segment 2112 can withstand a larger relative displacement between the connecting rod 11 and the piston rod 91. Similarly, the non-perpendicular second intermediate segment 2212 can withstand a larger relative displacement between the connecting rod 11 and the cylinder 92, thereby enabling the first spring plate 211 and the second spring plate 221 to be suitable for working conditions with a larger stroke of the piston rod 91. Furthermore, the angles a, c, b, and d are set so that the amplitude of the piston rod 91 can be distributed to the first spring plate 211 and the second spring plate 221.

[0050] See Figures 1 to 4 As shown, in some embodiments of the present invention, the included angle a is not equal to the included angle c, and the included angle b is not equal to the included angle d.

[0051] In this embodiment, the first intermediate segment 2112 and the second intermediate segment 2212 are non-parallel, which makes the first spring plate 211 and the second spring plate 221 generate a large constraint stiffness on the axial displacement of the connecting rod 11. The axial stiffness can be adjusted by the number of the first spring plate 211 and the second spring plate 221 arranged in the axial direction of the connecting rod 11. By selecting appropriate included angles a, c, b, and d, the moving direction of the connecting rod 11 can be made the same as the moving direction of the piston rod 91, and the displacement of the connecting rod 11 is less than the displacement of the piston rod 91. When the first connecting segment 2111 and the second connecting segment 2113 of the first spring plate 211 undergo relative displacement along the axial direction of the piston rod 91, the first connecting segment 2111 and the second connecting segment 2113 are in a relatively stable position. Figure 1 The horizontal distance remains constant. Similarly, when the third connecting segment 2211 and the fourth connecting segment 2213 of the second spring plate 221 undergo relative displacement along the axial direction of the piston rod 91, the horizontal distance between the third connecting segment 2211 and the fourth connecting segment 2213 remains constant, thus preventing the displacement of the piston rod 91 from generating significant axial tension on the first spring plate 211 and the second spring plate 221. The displacement of the connecting rod 11 is controlled by the first spring plate 211 and the second spring plate 221. The first spring plate 211 and the second spring plate 221 adjacent to each other in the axial direction of the connecting rod 11 maintain a constant length ( Figure 1The closer the required displacement of connecting rod 11 is to the piston rod 91 and the cylinder 92, while keeping the horizontal dimension constant, the more significant the effect of reducing the tension of the first spring plate 211 and the second spring plate 221 will be. Therefore, it is necessary to avoid arranging the center lines of the first intermediate section 2112 of the first spring plate 211 and the second intermediate section 2212 of the second spring plate 221 on a straight line. That is, it is necessary to avoid the included angles a and c being equal, and included angles b and d being equal. The selection of included angles a, c, b, and d can be achieved through experience, theoretical analysis, calculation, etc. in related fields, all of which are existing technologies and will not be detailed here.

[0052] The axial constraint stiffness of the first spring plate 211 and the second spring plate 221 on the connecting rod 11 can improve the overall stiffness of the entire piston guide device, and can raise the natural frequency of the piston guide device to a level close to the natural frequency of a single spring plate. Increasing the thickness of the first spring plate 211 and the second spring plate 221 ( Figure 1 The vertical dimension) and the length of the first spring plate 211 and the second spring plate 221 are reduced. Figure 1 The dimensions in the horizontal direction can increase the natural frequency of the first spring plate 211 and the second spring plate 221, thereby increasing the natural frequency of the entire piston guide device. By selecting appropriate dimensions for the first spring plate 211 and the second spring plate 221, the force on the first spring plate 211 and the second spring plate 221 can be controlled within their permanent lifespan, allowing for permanent or long-term use with minimal maintenance.

[0053] Specifically, the length of the first intermediate segment 2112 is the same as the length of the second intermediate segment 2212, and the included angles a and c are supplementary angles, as are the included angles b and d. This ensures that the force on the first spring plate 211 is the same as the force on the second spring plate 221.

[0054] See Figures 1 to 4 As shown, the present invention also provides a piston cylinder, including a cylinder body 92, a piston rod 91 disposed within the cylinder body 92, and the aforementioned piston guide device.

[0055] In this embodiment, the piston guide device for the piston cylinder has all the technical solutions and effects of the aforementioned piston guide device, which will not be repeated here.

[0056] The present invention also provides an engine, including a housing and the aforementioned piston cylinder, wherein the piston cylinder is disposed within the housing.

[0057] In this embodiment, the piston cylinder of the engine has all the technical solutions and effects of the aforementioned piston cylinder, which will not be repeated here.

[0058] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A guide device for a piston, characterized in that, The piston guide device, which can be disposed within the cylinder body (92) of the piston cylinder, includes: A connecting structure (10) movably disposed relative to the cylinder body (92); and An elastic structure (20) comprising: A first elastic component (21) is configured to connect the connecting structure (10) to the piston rod (91), thereby converting the tension exerted on the first elastic component (21) by the connecting structure (10) and the piston rod (91) during relative movement into elastic deformation of the first elastic component (21); and The second elastic component (22) is capable of connecting the connecting structure (10) to the cylinder (92) to convert the tension exerted on the second elastic component (22) by the connecting structure (10) and the cylinder (92) when they move relative to each other into elastic deformation of the second elastic component (22).

2. The piston guide device according to claim 1, characterized in that, The connecting structure (10) includes a plurality of connecting rods (11), which are spaced apart circumferentially along the piston rod (91). The connecting rods (11) are parallel to the piston rod (91) and are capable of moving in the same direction as the piston rod (91) under the action of its movement; and / or, The first elastic component (21) and the second elastic component (22) are located on the same side of the connecting structure (10) so that the connecting structure (10) can move in a direction opposite to and perpendicular to the piston rod (91) under the thrust generated by the elastic deformation of the first elastic component (21) and the second elastic component (22).

3. The piston guide device according to claim 2, characterized in that, The first elastic component (21) and the second elastic component (22) are spaced apart along the moving direction of the connecting structure (10); and / or, The first elastic component (21) and the second elastic component (22) each have an angle with the connecting structure (10), and the first elastic component (21) and the second elastic component (22) each form an angle with the piston rod (91).

4. The piston guide device according to any one of claims 1 to 3, characterized in that, The first elastic component (21) includes a first spring plate (211), one end of which is connected to the connecting structure (10), and the other end of which is connected to the piston rod (91); and / or, the second elastic component (22) includes a second spring plate (221), one end of which is connected to the connecting structure (10), and the other end of which is connected to the cylinder (92).

5. The piston guide device according to claim 4, characterized in that, The first elastic component (21) includes a plurality of first spring plates (211) arranged circumferentially spaced along the piston rod (91) to limit the direction of movement of the piston rod (91); and / or, The second elastic component (22) includes a plurality of second spring plates (221) arranged circumferentially spaced along the piston rod (91) to limit the direction of movement of the piston rod (91).

6. The piston guide device according to claim 5, characterized in that, The first spring plate (211) includes a first connecting segment (2111), a first intermediate segment (2112), and a second connecting segment (2113) connected in sequence. The first intermediate segment (2112) is inclined relative to the first connecting segment (2111) and the second connecting segment (2113). The first connecting segment (2111) is connected to the connecting structure (10), and the second connecting segment (2113) can be connected to the piston rod (91); and / or, The second spring plate (221) includes a third connecting section (2211), a second intermediate section (2212) and a fourth connecting section (2213) connected in sequence. The second intermediate section (2212) is inclined relative to the third connecting section (2211) and the fourth connecting section (2213). The third connecting section (2211) is connected to the connecting structure (10), and the fourth connecting section (2213) can be connected to the cylinder (92).

7. The piston guide device according to claim 6, characterized in that, The extension of the first intermediate segment (2112) forms an angle with the connecting structure (10), the angle being α, where 0° < α < 90° or 90° < α < 180°; the extension of the first intermediate segment (2112) forms an angle with the piston rod (91), the angle being β, where 0° < β < 90° or 90° < β < 180°; and / or, The extension line of the second intermediate segment (2212) has an angle with the connecting structure (10), the angle being c, 0° < c < 90° or 90° < c < 180°, and the extension line of the second intermediate segment (2212) has an angle with the piston rod (91), the angle being d, 0° < d < 90° or 90° < d < 180°.

8. The piston guide device according to claim 7, characterized in that, Angle a and angle c are not equal, and angle b and angle d are not equal; or, The length of the first intermediate segment (2112) is the same as the length of the second intermediate segment (2212), and the included angles a and c are complementary angles, and the included angles b and d are complementary angles.

9. A piston cylinder, characterized in that, It includes a cylinder body (92), a piston rod (91) disposed within the cylinder body (92), and a piston guide device as claimed in any one of claims 1 to 8.

10. An engine, characterized in that, It includes a housing and a piston cylinder as described in claim 9, the piston cylinder being disposed within the housing.

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