Double-cylinder damper

Abstract

The utility model discloses a double-cylinder damper which comprises two telescopic units, each telescopic unit comprises a cylinder body, a piston and a piston rod, the piston is connected in the cylinder body in a sealing and sliding mode, a cavity is formed between the piston and the lower end of the cylinder body, the piston rod penetrates through the upper end of the cylinder body and is fixedly connected with the piston, and the damper further comprises a connecting pipe. The connecting pipe is communicated with the cavities of the two telescopic units to form an oil way filled with oil, the oil way is provided with an installation space at least at one end of the connecting pipe, a silencing piece and a throttling piece are installed in the installation space in the extending direction of the oil way, a throttling hole is formed in the throttling piece in a penetrating mode, and flaring chamfers are arranged at the two ends of the throttling hole. Oil liquid flows between the two cavities through the silencing pieces and the throttling holes. The utility model provides a double-cylinder damper which can reduce noise.

Description

Technical Field

[0001] The utility model relates to the technical field of dampers, in particular to a double-cylinder damper. Background Art

[0002] Steppers are popular indoor fitness equipment. Dual-cylinder dampers, a key component in steppers, primarily provide damping and transmission between the left and right pedals. Existing dual-cylinder dampers, such as those described in patent application number CN202321820765.0, consist of two cylinders, pistons slidably connected within the cylinders, and a throttling component mounted within the cylinders. The two cylinders are connected by a connecting pipe. The dual-cylinder damper provides damping by flowing oil through the throttling component. In practice, this produces a high level of noise, impacting the user experience. Utility Model Content

[0003] In order to solve the shortcoming of the existing double-cylinder damper with high noise, the utility model provides a double-cylinder damper to reduce noise.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A double-cylinder damper includes two telescopic units, which include a cylinder body, a piston and a piston rod. The piston is sealed and slidably connected in the cylinder body, and a chamber is formed between the piston and the lower end of the cylinder body. The piston rod passes through the upper end of the cylinder body and is fixedly connected to the piston. The damper also includes a connecting pipe, which connects the chambers of the two telescopic units to form an oil circuit filled with oil. The oil circuit is provided with an installation space at at least one end of the connecting pipe. A silencer plate and a throttling member are installed in the installation space along the extension direction of the oil circuit. A throttling hole is provided on the throttling member, and flared chamfers are provided at both ends of the throttling hole. The oil flows between the two chambers through the silencer plate and the throttling hole.

[0006] With the above arrangement, when the oil flows through the silencer plate, the sound waves in the oil are consumed in the pores in the silencer plate. In addition, the oil passes through the throttle hole through the buffering effect of the flared chamfer, further reducing the damper noise.

[0007] Furthermore, two silencer plates are provided in the installation space, and the throttling member is clamped between the two silencer plates.

[0008] Through the above arrangement, sound waves can rebound between the two sound-absorbing sheets, further reducing noise.

[0009] Furthermore, grooves are provided on opposite sides of the throttling member, and both ends of the throttling hole extend to the center of the groove through flared chamfers.

[0010] Through the above settings, the noise reduction effect of the damper can be further improved.

[0011] Furthermore, a threaded groove is provided on one side of the lower end of the cylinder body, the bottom of the threaded groove is connected to the chamber through an oil channel, both ends of the connecting pipe are threadedly connected in the threaded groove and are against the bottom of the threaded groove, and an installation groove is provided at the end of the connecting pipe, and an installation space is formed between the installation groove and the bottom of the threaded groove.

[0012] Through the above arrangement, both ends of the connecting pipe are connected to the cylinder body through threaded grooves, which makes disassembly and assembly convenient.

[0013] Furthermore, the connecting pipe includes a connecting pipe body and a connecting head structure arranged at both ends of the connecting pipe body, the connecting head structure includes a first threaded member and a second threaded member, the first threaded member includes a nut threadedly connected in a threaded groove, and a threaded tube coaxially fixedly connected to the side of the nut away from the cylinder body, the second threaded member is threadedly connected to the outside of the threaded tube, and an annular space is formed between the second threaded member and the end of the threaded tube away from the nut, the end of the connecting pipe body is arranged in the annular space, the second threaded member is threadedly connected to the end of the connecting pipe body, the end of the threaded tube is provided with a conical surface for supporting the end of the connecting pipe body, the mounting groove is arranged on the inner side of the nut, and is connected to the connecting pipe body through the threaded tube.

[0014] Through the above arrangement, the sealing of both ends of the connecting pipe is ensured, and at the same time, the material of the connecting pipe is easily replaced.

[0015] Furthermore, the connecting pipe body adopts a high-pressure hose or a metal pipe.

[0016] Furthermore, the damper also includes a protective cover sleeved on the outside of the cylinder body.

[0017] The above arrangement prevents the damper from heating up and scalding the user during use.

[0018] Furthermore, the protective cover includes two half-tube structures buckled on opposite sides of the cylinder body, and the two half-tube structures are detachably connected together. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of a damper according to an embodiment.

[0020] Figure 2 for Figure 1 Enlarged view of point A. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be further specifically described below with reference to embodiments and in conjunction with the accompanying drawings.

[0022] like Figures 1 to 2As shown, a dual-cylinder damper includes two telescopic units 3, and the telescopic unit 3 includes a cylinder body 31, a piston 32 and a piston rod 33. The piston 32 is sealingly and slidingly connected in the cylinder body 31, and a chamber is formed between the piston 32 and the lower end of the cylinder body 31. The piston rod 33 passes through the upper end of the cylinder body 31 and is fixedly connected to the piston 32. The damper also includes a connecting pipe 9, which connects the chambers of the two telescopic units 3 to form an oil circuit filled with oil. The oil circuit is provided with an installation space at at least one end of the connecting pipe 9, and a silencer 4 and a throttling member 5 are installed in the installation space along the extension direction of the oil circuit. A throttling hole 6 is provided through the throttling member 5, and flaring chamfers 7 are provided at both ends of the throttling hole 6. The oil flows between the two chambers through the silencer 4 and the throttling hole 6.

[0023] With the above arrangement, when the oil flows through the silencer plate 4, the sound waves in the oil are consumed in the pores in the silencer plate 4. In addition, the oil passes through the throttle hole 6 through the buffering effect of the flared chamfer 7, further reducing the damper noise.

[0024] The piston 32 of the present application is sealingly and slidingly connected in the cylinder body 31, so that both ends of the oil circuit are sealed, and the clearance between the piston rod 33 and the upper end of the cylinder body 31 is matched, so that the upper side of the piston 32 is connected to the outside atmosphere; due to the incompressible nature of the oil, when the piston rod 33 of any telescopic unit 3 drives the piston 32 to move downward, the piston rod 33 and piston 32 of the other telescopic unit 3 will move in the opposite direction; specifically, when the piston 32 of any telescopic unit 3 moves downward, the volume of the corresponding chamber decreases, and the internal oil is pressed into the chamber of the other telescopic unit 3 through the muffler plate 4, the throttle hole 6 and the connecting pipe 9, the volume of the chamber of the other telescopic unit 3 increases, and the corresponding piston 32 and piston rod 33 move upward; in the present application, The silencer 4 and the throttling piece 5 are coaxially arranged cylindrical structures, or other shapes. The silencer 4 is a metal silencer made by powder metallurgy technology. It has a porous structure, which increases the contact area with the oil. When the oil flows through the silencer 4, the sound waves in the oil are consumed by the pores in the silencer 4, reducing the diffusion of the sound waves to the outside world; as another implementation method, the silencer can also be made of other materials with the same porous structure; the aperture of the throttling hole 6 is smaller than the inner diameter of the connecting pipe 9, which plays a throttling role. The oil flows through the throttling hole 6 and generates damping. The flared chamfers 7 are set at both ends of the throttling hole 6, so that the two ends of the throttling hole 6 produce a funnel effect. The flared chamfers 7 play a buffering role, reducing the impact between the oil and the throttling hole 6, thereby further reducing the noise generation.

[0025] As an implementation method, two silencer plates 4 are provided in the installation space, and the throttle member 5 is clamped between the two silencer plates 4 .

[0026] Through the above arrangement, sound waves can rebound between the two sound-absorbing sheets 4, further reducing noise.

[0027] The throttle member 5 of the present application is clamped between two silencer plates 4. When the oil generates noise through the throttle hole 6, the noise can be absorbed by the silencer plates 4 on the one hand, and on the other hand, the sound waves can rebound between the two silencer plates 4, further preventing the noise from being transmitted outward.

[0028] As an implementation method, grooves 8 are provided on opposite sides of the throttle member 5 , and both ends of the throttle hole 6 extend to the center of the groove 8 through flared chamfers 7 .

[0029] Through the above arrangement, the influence of the silencer sheet on damping is reduced.

[0030] The diameter of the throttle hole 6 in the present application is smaller than the diameter of the groove. After the oil passes through the throttle hole and enters the groove, the oil path width increases, the surface area of the muffler facing the oil is larger, and the oil flow through the muffler has less damping, and the muffler has basically no damping effect. The damping of the damper of the present application is achieved by designing the size of the throttle hole 6 on the throttle member 5. The muffler has basically no damping effect, thereby weakening the muffler's influence on the damping of the damper, facilitating the control of the damping size of the damper, and making the damping of the damper more precise.

[0031] As an implementation method, a threaded groove 311 is provided on one side of the lower end of the cylinder body 31, and the bottom of the threaded groove 311 is connected to the chamber through the oil channel 312. The two ends of the connecting pipe 9 are threadedly connected in the threaded groove 311 and are against the bottom of the threaded groove 311. An installation groove 10 is provided at the end of the connecting pipe 9, and an installation space is formed between the installation groove 10 and the bottom of the threaded groove 311.

[0032] Through the above arrangement, both ends of the connecting pipe 9 are connected to the cylinder body 31 through the threaded grooves 311 , which facilitates assembly and disassembly.

[0033] As an implementation method, the connecting pipe 9 includes a connecting pipe body 91 and a connecting head structure 92 arranged at both ends of the connecting pipe body 91, the connecting head structure 92 includes a first threaded member and a second threaded member 921, the first threaded member includes a nut 922 threadedly connected to the thread groove 311, and a threaded tube 923 coaxially fixedly connected to the side of the nut 922 away from the cylinder body 31, the second threaded member 921 is threadedly connected to the outside of the threaded tube 923, and an annular space is formed between the second threaded member 921 and the end of the threaded tube 923 away from the nut 922, the end of the connecting pipe body 91 is arranged in the annular space, the second threaded member 921 is threadedly connected to the end of the connecting pipe body 91, and the end of the threaded tube 923 is provided with a conical surface 924 for supporting the end of the connecting pipe body 91, and the mounting groove 10 is arranged on the inner side of the nut 922 and is connected to the connecting pipe body 91 through the threaded tube 923.

[0034] Through the above arrangement, the sealing of both ends of the connecting pipe 9 is ensured, and at the same time, the material of the connecting pipe 9 is easily replaced.

[0035] The first threaded member and the second threaded member 921 of the present application are made of metal, such as copper or steel, and have good rigidity and strength. One end of the second threaded member 921 is provided with an internal thread for threaded connection with the connecting pipe body 91, and the other end is provided with an internal thread for threaded connection with the threaded pipe 923. The end of the connecting pipe 9 away from the tapered surface 924 is provided with a corresponding external thread. When installing the connecting pipe 9, first tighten the end of the connecting pipe body 91 into one end of the second threaded member 921, and then the first threaded member is provided with a tapered surface 924. One end passes through the other end of the second threaded member 921 and is inserted into the connecting pipe body 91, and the first threaded member is tightened to lock the first threaded member and the second threaded member 921 together. At the same time, during the tightening process, the conical surface 924 gradually enters the connecting pipe body 91, and the end of the connecting pipe 9 main body is stretched and pressed against the inner wall of the second threaded member 921 to ensure the sealing of the end of the connecting pipe body 91. Finally, the silencer 4 and the throttling member 5 are placed in the mounting groove 10, and the nut 922 of the first threaded member is tightened in the threaded groove 311.

[0036] As an implementation method, the connecting pipe body 91 adopts a high-pressure hose or a metal pipe.

[0037] When the connecting pipe body 91 of the present application adopts a high-pressure hose, it is convenient to bend and install; when a metal pipe is adopted, it has better strength.

[0038] As an implementation method, the damper further includes a protective cover 11 sleeved on the outside of the cylinder 31 .

[0039] The above arrangement prevents the damper from heating up and scalding the user during use.

[0040] As an implementation method, the protective cover 11 includes two half-tube structures buckled on opposite sides of the cylinder body 31, and the two half-tube structures are detachably connected together. Specifically, the two half-tube structures can be installed together by fasteners, buckles, or other tight-fitting methods.

[0041] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to this utility model.

Claims

1. A twin-cylinder damper, characterized in that: The invention relates to a novel telescopic damper comprising two telescopic units, which include a cylinder, a piston and a piston rod. The piston is sealingly and slidingly connected to the cylinder, and a chamber is formed between the piston and the lower end of the cylinder. The piston rod passes through the upper end of the cylinder and is fixedly connected to the piston. The damper also includes a connecting pipe, which connects the chambers of the two telescopic units to form an oil circuit filled with oil. The oil circuit is provided with an installation space at at least one end of the connecting pipe. A silencer and a throttling member are installed in the installation space along the extension direction of the oil circuit. A throttling hole is provided on the throttling member, and flared chamfers are provided at both ends of the throttling hole. The oil flows between the two chambers through the silencer and the throttling hole.

2. A dual-cylinder damper according to claim 1, characterized in that: Two silencer plates are arranged in the installation space, and the throttling member is clamped between the two silencer plates.

3. A dual-cylinder damper according to claim 1, characterized in that: Grooves are provided on opposite sides of the throttling member, and both ends of the throttling hole extend to the center of the groove through the flared chamfers.

4. A dual-cylinder damper according to claim 1, characterized in that: A thread groove is provided on one side of the lower end of the cylinder body, and the bottom of the thread groove is connected to the chamber through an oil channel. Both ends of the connecting pipe are threadedly connected to the thread groove and abut against the bottom of the thread groove. An installation groove is provided at the end of the connecting pipe, and the installation space is formed between the installation groove and the bottom of the thread groove.

5. A twin-cylinder damper according to claim 4, characterized in that: The connecting pipe includes a connecting pipe body and a connecting head structure arranged at both ends of the connecting pipe body, the connecting head structure includes a first threaded member and a second threaded member, the first threaded member includes a nut threadedly connected to the threaded groove, and a threaded tube coaxially fixedly connected to the nut on the side away from the cylinder body, the second threaded member is threadedly connected to the outside of the threaded tube, and an annular space is formed between the second threaded member and the end of the threaded tube away from the nut, the end of the connecting pipe body is arranged in the annular space, the second threaded member is threadedly connected to the end of the connecting pipe body, the end of the threaded tube is provided with a conical surface for supporting the end of the connecting pipe body, and the mounting groove is arranged on the inner side of the nut and is connected to the connecting pipe body through the threaded tube.

6. A dual-cylinder damper according to claim 5, characterized in that: The connecting pipe body is a high-pressure hose or a metal pipe.

7. The dual-cylinder damper according to claim 1, characterized in that: The damper further comprises a protective cover sleeved on the outside of the cylinder.

8. A twin-cylinder damper according to claim 7, characterized in that: The protective cover comprises two half-tube structures buckled on opposite sides of the cylinder body, and the two half-tube structures are detachably connected together.

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