Treadmill with impact noise reduction function and method for reducing noise of treadmill

Abstract

The present application relates to the technical field of treadmills, and particularly relates to a treadmill with impact noise reduction function and a treadmill impact noise reduction method, which comprises first and second buffer pads arranged in front of and behind a running board and a main frame, the head of a first bolt insert and a first nut insert in the first buffer pad are both covered with a first polypropylene cover, the second buffer pad is in abutment with the running board and is locked and installed on the main frame through a second bolt insert with a head covered with a second polypropylene cover. The second buffer pad group is arranged in the landing area and the supporting area, the nut insert is cancelled and the running board is pressed on the top of the second buffer pad, the shock absorption and noise reduction function of the TPE elastomer is retained to the maximum extent, the characteristics of the TPE elastomer in inhibiting vibration propagation and the good compatibility between the TPE elastomer and the cover bolt insert and the cover nut insert are utilized, so that the treadmill has good buffer and shock absorption performance and also has the function of effectively reducing the impact noise on the floor.

Description

Technical Field

[0001] This invention relates to the field of treadmill technology, specifically to a treadmill with impact noise reduction function and a treadmill impact noise reduction method. Background Technology

[0002] Treadmills typically use a cushioning pad between the running board and the main frame to absorb shock and reduce the adverse impact of reaction forces on the knees and body. For example, the treadmill shock absorption mechanism disclosed in Chinese patent document (CN203756837U) uses bolts to lock the bottom into a lower fixed seat, and nuts and external bolts to lock the top into an upper fixed seat. The nuts and bolts in this type of shock absorption mechanism are made of metal, and their bonding strength with the natural rubber-based cushioning pad is generally weak. After a period of use, delamination, damage, or breakage can easily occur, leading to abnormal noise during running. Summary of the Invention

[0003] The purpose of this invention is to provide a treadmill with impact noise reduction function and a treadmill impact noise reduction method, which has good cushioning and shock absorption performance while also reducing impact noise on the floor.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A treadmill with impact noise reduction function includes a running board and a main frame, with a first buffer pad group and a second buffer pad group arranged at intervals between the running board and the main frame. The first buffer pad assembly includes first buffer pads symmetrically arranged on the left and right sides of the front of the running board. The first buffer pad includes a first TPE elastomer, a first bolt insert with its head embedded inside the first TPE elastomer, and a first nut insert with its head embedded inside the first TPE elastomer. The top of the first buffer pad is locked onto the running board by the first nut insert, and the bottom of the first buffer pad is locked onto the main frame by the first bolt insert. The head of the first bolt insert and the first nut insert are both covered with a first polypropylene sleeve. The second buffer pad assembly includes second buffer pads symmetrically arranged on the left and right sides of the middle of the running board. The second buffer pad includes a second TPE elastomer and a second bolt insert whose head is embedded inside the second TPE elastomer. The top of the second buffer pad abuts against the running board, and the bottom of the second buffer pad is locked onto the main frame by the second bolt insert. The head of the second bolt insert is covered with a second polypropylene sleeve. The second cushioning pad group has at least two groups; The left and right sides of the rear of the running board are respectively locked onto the main frame by fasteners or a third buffer pad.

[0005] Preferably, the outer wall of the first polypropylene sheath has a first interlocking structure that interlocks with the first TPE elastomer.

[0006] Preferably, the first TPE elastomer has a first deformation hole at its top, and the first deformation hole is coaxially arranged with the first nut insert and the first TPE elastomer.

[0007] Preferably, the outer wall of the second polypropylene sheath has a second interlocking structure that interlocks with the second TPE elastomer.

[0008] Preferably, the second TPE elastomer has a second deformation hole at its top, and the second deformation hole is arranged coaxially with the second TPE elastomer.

[0009] Preferably, both the first TPE elastomer and the second TPE elastomer are cylindrical.

[0010] Preferably, the first buffer pad group has one set, and the second buffer pad group has three sets, which are arranged from front to back as the first set, the second set and the third set. The first set of second buffer pad groups and the second set of second buffer pad groups are arranged adjacent to each other, and the third set of second buffer pad groups, the second set of second buffer pad groups and the first set of buffer pad groups are arranged at equal intervals, or the third set of second buffer pad groups, the first set of second buffer pad groups and the first set of buffer pad groups are arranged at equal intervals.

[0011] The present invention also provides a treadmill impact noise reduction method, which uses the above-mentioned treadmill with impact noise reduction function, wherein the running board is locked and installed with the first buffer pad group and abuts against the second buffer pad group, and the second buffer pad group corresponds to the landing area and the support area of ​​the running board.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This invention includes a first buffer pad assembly and a second buffer pad assembly between the running board and the main frame. The first buffer pad assembly is positioned at the front of the running board and is secured to both the running board and the main frame using sleeve bolt inserts and sleeve nut inserts, thus stabilizing the running board on the main frame. Since the main areas of impact from the runner during running are concentrated in the foot landing area and support area of ​​the running board, the second buffer pad assembly is positioned in these areas. The bottom of the second buffer pad assembly is secured to the main frame using sleeve bolt inserts to fix the second buffer pad to the main frame. The top of the second buffer pad assembly does not require a nut insert. Instead of using a running plate, the first and second buffer pads are pressed against the top of the second buffer pad. This eliminates the need for the metal rigidity of the nut insert and preserves the shock absorption and noise reduction functions of the TPE elastomer to the greatest extent. The main body of both the first and second buffer pads in this invention is made of TPE elastomer. By utilizing the effective vibration suppression properties of TPE elastomer and the good compatibility between TPE elastomer and the sheathed bolt insert and sheathed nut insert, combined with the arrangement of the first and second buffer pad groups and the connection design with the running plate, it has good buffering and shock absorption performance while also effectively reducing the impact noise on the floor. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the installation of the running board, main frame, first buffer pad group, and second buffer pad group of the present invention.

[0014] Figure 2 for Figure 1 The enlarged view of part A shown in the image.

[0015] Figure 3 for Figure 1 The enlarged view of part B shown in the image.

[0016] Figure 4 This is a schematic diagram of the molding process and structure of the first buffer pad of the present invention.

[0017] Figure 5 This is a schematic diagram of the molding process and structure of the second buffer pad of the present invention.

[0018] The markings in the diagram are: 10, running board; 20, main frame; 21, first bearing seat; 22, second bearing seat; 30, first buffer pad; 31, first TPE elastomer; 32, first nut insert; 33, first bolt insert; 34, first polypropylene sleeve; 35, first deformation hole; 301, first engagement groove; 40, second buffer pad; 41, second TPE elastomer; 43, second bolt insert; 44, second polypropylene sleeve; 45, second deformation hole; 401, second engagement groove. Detailed Implementation

[0019] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0020] like Figure 1 As shown, this embodiment provides a treadmill with impact noise reduction function, including a running board 10 and a main frame 20. A first buffer pad group and a second buffer pad group are arranged at intervals between the running board 10 and the main frame 20. The first buffer pad group includes first buffer pads 30 symmetrically arranged on the left and right sides of the front part of the running board 10, and the second buffer pad group includes second buffer pads 40 symmetrically arranged on the left and right sides of the middle part of the running board 10. The left and right sides of the rear part of the running board 10 are respectively locked onto the main frame 20 by fasteners. The combined buffer device of the first buffer pads 30 and the second buffer pads 40 gives the treadmill a good cushioning and shock absorption effect.

[0021] like Figure 2 and Figure 4 As shown, the first buffer pad group has one set, with one first buffer pad 30 arranged on each of the left and right sides of the front part of the running plate 10. The first buffer pad 30 includes a first TPE elastomer 31, a first bolt insert 33 with its head embedded inside the first TPE elastomer 31, and a first nut insert 32 with its head embedded inside the first TPE elastomer 31. The top of the first buffer pad 30 is locked onto the running plate 10 by the first nut insert 32 in conjunction with external bolt fasteners, while the bottom of the first buffer pad 30 is locked onto the main frame 20 by the first bolt insert 33. A first bearing seat 21 is fixedly installed on the main frame 20, and the first bearing seat 21 has a first threaded mounting hole that is threaded to engage with the first bolt insert 33.

[0022] In this embodiment, the first TPE elastomer 31 is a cylinder with a first deformation hole 35 at its top. The first deformation hole 35 is coaxially arranged with the first TPE elastomer 31, and the first deformation hole 35 can achieve greater deformation and absorb more impact.

[0023] Since the first bolt insert 33 and the first nut insert 32 are made of metal, the compatibility between metal and TPE elastomer is poor. After a period of use, separation, delamination, or even detachment of the metal insert and TPE elastomer is likely to occur, leading to significant abnormal noise during running. To solve this technical problem, this embodiment further proposes to cover the head of the first bolt insert 33 and the first nut insert 32 with a first polypropylene sheath 34. That is, before embedding the first bolt insert 33 and the first nut insert 32 into the first TPE elastomer 31, the first bolt insert 33 and the first nut insert 32 are first covered with PP melt to form a sheath insert. The good compatibility between the first polypropylene sheath 34 and the first TPE elastomer 31 enhances strength while reducing noise.

[0024] To increase the bonding force between the first polypropylene sheath 34 and the first TPE elastomer 31 in the first buffer pad 30, the outer wall of the first polypropylene sheath 34 in this embodiment has a first interlocking structure that engages and interlocks with the first TPE elastomer 31. Specifically, the first polypropylene sheath 34 outside the first bolt insert 33 and the first polypropylene sheath 34 outside the first nut insert 32 are both circumferentially spaced with multiple first interlocking grooves 301. This allows the circumferentially arranged first interlocking structure to enhance the firm bond between the first polypropylene sheath 34 and the first TPE elastomer 31 during rotational installation. Of course, the first interlocking grooves 301 can also be replaced with first interlocking teeth.

[0025] like Figure 3 and Figure 5 As shown, the second cushioning pad group has three sets, arranged from front to back as the first set, the second set, and the third set. The first and second sets of second cushioning pads are arranged adjacent to each other and correspond to the landing area of ​​the running board 10. The third set of second cushioning pads corresponds to the support area of ​​the running board 10. The third set, the second set, and the first set of second cushioning pads are evenly spaced (note that in other examples, the third set, the first set, and the first set of second cushioning pads can also be evenly spaced). The landing area refers to the area on the running board 10 when the foot is the swinging foot during the gait cycle. The support area refers to the area on the running board 10 when the foot is the supporting foot during the gait cycle. Because the reaction force of the running board 10 on the foot is relatively large upon landing, the second cushioning pads are concentrated in this area.

[0026] Each second buffer pad assembly includes two second buffer pads 40 symmetrically arranged on the left and right sides of the middle of the running plate 10. The second buffer pad 40 includes a second TPE elastomer 41 and a second bolt insert 43 whose head is embedded inside the second TPE elastomer 41. The top of the second buffer pad 40 abuts against the running plate 10, and the bottom of the second buffer pad 40 is locked onto the main frame 20 by the second bolt insert 43. A second bearing seat 22 is fixedly installed on the main frame 20, and the second bearing seat 22 has a second threaded mounting hole that is threaded to engage with the second bolt insert 43.

[0027] In this embodiment, the second TPE elastomer 41 is a cylinder with a second deformation hole 45 at its top. The second deformation hole 45 is coaxially arranged with the second TPE elastomer 41, and the second deformation hole 45 can achieve greater deformation and absorb more impact.

[0028] Similarly, the head of the second bolt insert 43 is covered with a second polypropylene sleeve 44. Before embedding the second bolt insert 43 into the second TPE elastomer 41, the second bolt insert 43 is first covered with PP melt to form a sleeve insert. The good compatibility between the second polypropylene sleeve 44 and the second TPE elastomer 41 enhances the strength while reducing noise.

[0029] To increase the bonding force between the second polypropylene sheath 44 and the second TPE elastomer 41 in the second buffer pad 40, the outer wall of the second polypropylene sheath 44 in this embodiment has a second interlocking structure that engages and interlocks with the second TPE elastomer 41. Specifically, the second polypropylene sheath 44 outside the second bolt insert 43 has a plurality of second interlocking grooves 401 arranged circumferentially. This allows the circumferentially arranged second interlocking structure to enhance the firm bond between the second polypropylene sheath 44 and the second TPE elastomer 41 during rotational installation. Of course, the second interlocking grooves 401 can also be replaced with second interlocking teeth. The first TPE elastomer 31 and the second TPE elastomer 41 are preferably Kuraray HYBRAR series styrene triblock copolymer thermoplastic elastomers, having polystyrene end caps and an intermediate segment rich in ethylene branched polydiene.

[0030] During installation, the first buffer pad 30 is locked to the main frame 20 by the exposed threaded part of the first bolt insert 33. The second buffer pad 40 is locked to the main frame 20 by the exposed threaded part of the second bolt insert 43 according to the layout of the second buffer pad group. Then, the running plate 10 is pressed on the first buffer pad 30 and the second buffer pad 40. The running plate 10 is locked together with the first nut insert 32 by the external bolt fastener. The running plate 10 is pressed against the top of the second buffer pad 40. Then, the rear end of the running plate 10 is locked to the main frame 20 by the fastener. (Note that in some other examples, a third buffer pad can also be installed between the rear end of the running plate 10 and the main frame 20. The third buffer pad can be exactly the same as the first buffer pad 30 or it can be an airbag pad, etc.)

[0031] During running, the first and second cushioning pad groups provide shock absorption and also effectively reduce the impact noise of the treadmill on the floor, resulting in a more worry-free user experience. Tests showed that with a runner weighing 110 kg and an ambient noise level of 30 decibels, the impact noise from below was 32-33 decibels. However, under the same test conditions and cushioning pad arrangement, using natural rubber with unencased metal inserts resulted in an impact noise level of 41-43 decibels. Furthermore, if the second cushioning pad 40 of the second cushioning pad group has the same construction as the first cushioning pad 30 (also having a nut insert and being locked onto the running board 10 using the nut insert), the impact noise reduction under the same test conditions is significantly less than that of this embodiment.

[0032] The foregoing has shown and described the basic principles, main features and advantages of this invention. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of this invention. Various changes and modifications can be made to this invention without departing from the spirit and scope of this invention. All such changes and modifications fall within the scope of this invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A treadmill with impact noise reduction function, comprising a running board and a main frame, characterized in that: A first buffer pad group and a second buffer pad group are arranged at intervals between the running board and the main frame. The first buffer pad assembly includes first buffer pads symmetrically arranged on the left and right sides of the front of the running board. The first buffer pad includes a first TPE elastomer, a first bolt insert with its head embedded inside the first TPE elastomer, and a first nut insert with its head embedded inside the first TPE elastomer. The top of the first buffer pad is locked onto the running board by the first nut insert, and the bottom of the first buffer pad is locked onto the main frame by the first bolt insert. The head of the first bolt insert and the first nut insert are both covered with a first polypropylene sleeve. The second buffer pad assembly includes second buffer pads symmetrically arranged on the left and right sides of the middle of the running board. The second buffer pad includes a second TPE elastomer and a second bolt insert whose head is embedded inside the second TPE elastomer. The top of the second buffer pad abuts against the running board, and the bottom of the second buffer pad is locked onto the main frame by the second bolt insert. The head of the second bolt insert is covered with a second polypropylene sleeve. The first TPE elastomer has a first deformation hole on its top, and the first deformation hole is coaxially arranged with the first nut insert and the first TPE elastomer; the second TPE elastomer has a second deformation hole on its top, and the second deformation hole is coaxially arranged with the second TPE elastomer. The second cushioning pad group has three groups, which are arranged from front to back as the first group, the second group and the third group. The first group of second cushioning pads and the second group of second cushioning pads are arranged adjacent to each other and correspond to the landing area of ​​the running board. The third group of second cushioning pads corresponds to the support area of ​​the running board. The left and right sides of the rear of the running board are respectively locked onto the main frame by fasteners or a third buffer pad.

2. The treadmill with impact noise reduction function according to claim 1, characterized in that: The outer wall of the first polypropylene sheath has a first interlocking structure that interlocks with the first TPE elastomer.

3. The treadmill with impact noise reduction function according to claim 1, characterized in that: The outer wall of the second polypropylene sheath has a second interlocking structure that interlocks with the second TPE elastomer.

4. The treadmill with impact noise reduction function according to claim 1, characterized in that: Both the first TPE elastomer and the second TPE elastomer are cylindrical.

5. The treadmill with impact noise reduction function according to any one of claims 1 to 4, characterized in that: The first buffer pad group has one group, a third group of second buffer pad groups, a second group of second buffer pad groups and the first buffer pad group arranged at equal intervals, or a third group of second buffer pad groups, a first group of second buffer pad groups and the first buffer pad group arranged at equal intervals.

6. A method for reducing impact noise in treadmills, characterized in that: The treadmill with impact noise reduction function as described in any one of claims 1 to 5 is used, wherein the running board is locked and installed with the first cushioning pad group and abuts against the second cushioning pad group, and the second cushioning pad group corresponds to the foot landing area and support area of ​​the running board.

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