A flexible shock absorbing device for an automatic pace running machine

Abstract

The application discloses a flexible damping device suitable for an automatic speed matching treadmill, and relates to the technical field of treadmills. The inner support assembly inside a running belt is optimized based on a conventional treadmill structure, and the essence is that the upper movable plate of the inner support assembly independently exists and does not affect each other in cooperation with the running posture of an exerciser on the basis of serving as a running belt supporting structure. In the running process, the rebound force generated on the knee of the exerciser is indirectly fed back according to the "pressure" applied to the upper movable plate in the corresponding position by the single leg of the exerciser. Specifically, the deflection and inclination action of the upper movable plate is combined in a passive and active form. The reference data of the upper movable plate is passively formed by the "pressure" applied by the single leg without affecting the exercise process, so that the upper movable plate is actively moved. The impact force of the knee part of the exerciser is always in a relatively balanced or low fluctuation state, thereby indirectly playing a buffering and damping protection role.

Description

Technical Field

[0001] This invention relates to the field of treadmill technology, and more specifically to a flexible shock absorption device suitable for automatic pacing treadmills. Background Technology

[0002] The working principle of running mainly involves a motor driving a running belt to reciprocate, which is combined with the passive walking and running of the athlete on the running belt. It is essentially a combination structure of rollers and running belt. By controlling the operating data of the motor, functions such as variable speed running, incline adjustment and shock absorption can be achieved.

[0003] It should be noted that the process of changing the speed of the running belt will inevitably affect the exerciser's exercise process (step frequency, step speed), resulting in differences in the impact force on the knees and lower limbs, especially in the knee area. The running belts in conventional treadmills are mostly made of elastic materials, which have some cushioning capacity, but they are difficult to fully adapt to the difference in impact force during the speed change, thereby aggravating sports injuries in the knee area, such as discomfort and pain in the knee area after exercise.

[0004] This application proposes a solution to this problem. Summary of the Invention

[0005] The purpose of this invention is to provide a flexible shock absorption device suitable for automatic pacing treadmills. The automatic pacing (speed change) function in existing treadmills causes differences in the impact force on the knees and lower limbs during the speed change process. The elastic cushioning capacity of the running belt cannot fully adapt to the differences in impact force during the speed change process, which in particular aggravates sports injuries to the knees.

[0006] The objective of this invention can be achieved through the following technical solution: A flexible shock absorption device suitable for an automatic pacing treadmill, comprising a frame assembly, a drive assembly, and a running belt, wherein an inner support assembly is provided in the frame assembly at a position corresponding to the inside of the running belt, and the inner support assembly comprises a lower fixed plate, an upper movable plate, a drive roller shaft, and a directional roller shaft;

[0007] The lower fixed plate is installed in the frame assembly, and a connecting platform is installed at the center point of the lower fixed plate. The upper movable plate is symmetrically arranged along the connecting platform in the width direction of the running belt, and the upper movable plate and the connecting platform are rotatably connected. The lower fixed plate is provided with a longitudinal axis corresponding to the length direction of the running belt and a transverse axis corresponding to the width direction of the running belt. A pressure sensor is installed at the diagonal point of the lower fixed plate corresponding to the upper movable plate. A ball joint is installed at the transmission end of the pressure sensor, and the upper end of the ball joint corresponds to the upper movable plate.

[0008] The configuration is further defined as follows: the distance between the lower surface of the lower fixed plate and the upper surface of the upper movable plate is equal to the gap height of the running belt in the vertical direction; the drive roller shaft is located at both ends of the running belt; and the directional roller shaft is tangent to the inner contour line of the running belt.

[0009] A further configuration is provided: a buffer spring is installed on the upper surface of the lower fixed plate at a position corresponding to the upper movable plate, and the upper end of the buffer spring is connected to the upper movable plate.

[0010] The lower fixing plate is further configured such that a first motor, a second motor, and a bearing seat corresponding to the transverse and longitudinal axes are mounted on the lower fixing plate. The positions of the transverse and longitudinal axes corresponding to the lower fixing plate are set as smooth portions, and the lower curved surfaces of the smooth portions corresponding to the transverse and longitudinal axes are tangent to the upper surface of the lower fixing plate.

[0011] The configuration is further defined as follows: the transverse axis is located at the midpoint between the upper surface of the lower fixed plate and the upper part of the running belt; the longitudinal axis is located at the midpoint between the upper surface of the lower fixed plate and the lower surface of the upper movable plate; the diameter of the smooth portion in the longitudinal axis is equal to the distance between the upper surface of the lower fixed plate and the lower surface of the upper movable plate; and the diameter of the smooth portion in the transverse axis is less than the distance between the upper surface of the lower fixed plate and the lower surface of the upper movable plate.

[0012] Further configuration: the longitudinal axis is configured as a relief portion along the curved surface away from the buffer spring, the transverse axis is configured as an opposite protrusion near the upper end of the upper movable plate, the diameter of the relief portion is smaller than the diameter of the smooth portion in the longitudinal axis, and the diameter of the opposite protrusion is equal to the distance between the upper surface of the lower fixed plate and the lower surface of the upper movable plate.

[0013] The present invention has the following beneficial effects:

[0014] The overall structure is based on the conventional treadmill structure and is optimized and improved to obtain the inner support assembly inside the running belt. The upper movable plate in the inner support assembly still serves as the support structure of the running belt, but the difference is that the upper movable plate is symmetrically set along the width of the running belt. It can move independently according to the running posture of the athlete and is not related to each other. During its operation, it mainly indirectly feeds back the reaction force generated on the athlete's knee based on the "pressure" applied by the athlete's single leg to the corresponding position of the upper movable plate. Specifically, the upper movable plate adopts a deflection and tilting process that combines passive and active forms.

[0015] To reiterate the above, the overall device employs a combination of passive and active tilting motions for the upper movable plate. Specifically, it synchronously activates the second motor at the corresponding position based on the user's stride frequency, causing the longitudinal axis at that position to rotate in a specific direction. Simultaneously, it records the pressure difference value at a single stride frequency. The specific value of the pressure difference is used to determine whether the treadmill has any issues related to sports injuries. Furthermore, based on the pressure difference value, the angle of the upper movable plate's tilting process is limited. Essentially, it uses an "autonomous application" and "autonomous adjustment" approach to keep the impact force on the user's knees in a relatively balanced or low-fluctuation state, thereby indirectly playing a role in cushioning and shock absorption protection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a flexible shock absorption device suitable for an automatic pacing treadmill proposed in this invention;

[0018] Figure 2 This is a cross-sectional view of the inner support assembly in a flexible shock absorption device suitable for an automatic pacing treadmill proposed in this invention.

[0019] Figure 3 This is a schematic diagram of the inner support assembly in a flexible shock absorption device suitable for an automatic pacing treadmill proposed in this invention.

[0020] Figure 4 This is an exploded view of the inner support assembly in a flexible shock absorption device suitable for an automatic pacing treadmill proposed in this invention.

[0021] Figure 5 This is a cross-sectional view of the running belt along the longitudinal axis in a flexible shock absorption device suitable for an automatic pacing treadmill proposed in this invention.

[0022] Figure 6 This is a cross-sectional view of the running belt corresponding to the transverse axis in a flexible shock absorption device suitable for an automatic pacing treadmill proposed in this invention.

[0023] In the diagram: 1. Frame assembly; 2. Drive assembly; 3. Running belt; 4. Buffer spring; 5. Upper movable plate; 6. Lower fixed plate; 7. Pressure sensor; 8. Orientation roller; 9. Drive roller; 10. Transverse axis; 1001. Smooth part; 1002. Opposite protrusion; 11. First motor; 12. Connecting platform; 13. Second motor; 14. Longitudinal axis; 1401. Clearance part. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1: Regarding the automatic pacing (speed change) function in current treadmills, because the impact force on the knees and lower limbs varies during speed changes, the elastic cushioning capacity of the running belt cannot fully adapt to the impact force differences during speed changes, especially aggravating sports injuries to the knees. The following technical solution is proposed to address this:

[0026] Reference Figures 1-6 A flexible shock absorption device suitable for an automatic pacing treadmill in this embodiment includes a frame assembly 1, a drive assembly 2 and a running belt 3. An inner support assembly is provided in the frame assembly 1 at a position corresponding to the inside of the running belt 3. The inner support assembly includes a lower fixed plate 6, an upper movable plate 5, a drive roller 9 and a directional roller 8.

[0027] The lower fixed plate 6 is installed in the frame assembly 1, and a connecting platform 12 is installed at the center point of the lower fixed plate 6. The upper movable plate 5 is symmetrically arranged along the connecting platform 12 in the width direction of the running belt 3, and the upper movable plate 5 and the connecting platform 12 are rotatably connected. The lower fixed plate 6 is provided with a longitudinal shaft 14 corresponding to the length direction of the running belt 3, and a transverse shaft 10 corresponding to the width direction of the running belt 3. A pressure sensor 7 is installed on the lower fixed plate 6 at the diagonal point corresponding to the upper movable plate 5. A ball joint is installed at the transmission end of the pressure sensor 7, and the upper end of the ball joint corresponds to the upper movable plate 5.

[0028] The distance between the lower surface of the lower fixed plate 6 and the upper surface of the upper movable plate 5 is equal to the gap height of the running belt 3 in the vertical direction. The drive roller shaft 9 is set at both ends of the running belt 3. The directional roller shaft 8 is tangent to the inner contour line of the running belt 3. A buffer spring 4 is installed on the upper surface of the lower fixed plate 6 at the position corresponding to the upper movable plate 5. The upper end of the buffer spring 4 is connected to the upper movable plate 5.

[0029] Working principle: First, a brief explanation of the treadmill: Essentially, it uses a motor to drive the running belt 3 in a continuous reciprocating rotation, thus assisting the user in running training. Specifically... Figure 2 The drive assembly 2 and drive roller 9 drive the running belt 3 to rotate continuously. To meet different exercise requirements, the running belt 3 can be controlled by controlling the operating parameters of the motor, thereby achieving the purpose of variable speed running. However, it is important to note that:

[0030] The speed change process will inevitably affect the athlete's walking speed / step frequency. Under the premise of correct running posture, when the running speed increases from low speed to high speed, the force of the athlete "stepping" on the running belt will be different, and thus the reaction force generated by the running belt on the athlete's lower limbs will be different. In particular, it will increase the risk of sports injuries to related structures in the knee, such as meniscus wear. The treadmill proposed in this invention differs from the conventional structure in that the inner support assembly of this invention is reflected in the treadmill.

[0031] The upper movable plate 5 in the inner support assembly serves as a structure supporting the upper part of the running belt 3. However, it needs to be configured as two plates along the width of the running belt 3, and both plates can rotate freely along the connecting platform 12. During running, the athlete's left leg primarily steps on the upper movable plate 5 on the left side, and the right leg primarily steps on the upper movable plate 5 on the right side. This can be understood as: a single upper movable plate 5 mainly bears the "pressure" of one leg. (The last sentence appears to be incomplete and possibly refers to a different context.) Figure 5 When one of the upper movable plates 5 is subjected to the "pressure" of a single leg, the "pressure" of the single leg during running can be detected by the pressure sensor 7.

[0032] Conventional running belts 3 are mostly made of flexible materials, which have a certain cushioning and protection capacity, but their cushioning and protection capacity is low. To address this, multiple buffer springs 4 are added between the upper movable plate 5 and the lower fixed plate 6. However, it should be noted that the spring structure is essentially a process of absorbing and releasing "energy". Although it has a cushioning capacity, its protection capacity is not high due to the release of "energy". In this invention, the tilt angle of the upper movable plate 5 in the relative horizontal direction is passively changed by the longitudinal axis 14, and the tension of the running belt 3 is passively changed by the transverse axis 14. Specifically, the tension is adjusted autonomously according to the pressure of the athlete on the upper movable plate 5. By combining these methods, the reaction force on the athlete's lower limbs is reduced, thereby achieving the effect of shock absorption and protection.

[0033] Example 2: This example explains the longitudinal and transverse axes from Example 1:

[0034] The lower fixed plate 6 is equipped with a first motor 11, a second motor 13 and a bearing seat corresponding to the transverse shaft 10 and the longitudinal shaft 14. The positions of the transverse shaft 10 and the longitudinal shaft 14 corresponding to the lower fixed plate 6 are set as smooth parts 1001, and the lower curved surfaces of the smooth parts 1001 corresponding to the transverse shaft 10 and the longitudinal shaft 14 are tangent to the upper surface of the lower fixed plate 6.

[0035] The transverse axis 10 is located at the midpoint between the upper surface of the lower fixed plate 6 and the upper part of the running belt 3. The longitudinal axis 14 is located at the midpoint between the upper surface of the lower fixed plate 6 and the lower surface of the upper movable plate 5. The diameter of the smooth portion 1001 in the longitudinal axis 14 is equal to the distance between the upper surface of the lower fixed plate 6 and the lower surface of the upper movable plate 5. The diameter of the smooth portion 1001 in the transverse axis 10 is smaller than the distance between the upper surface of the lower fixed plate 6 and the lower surface of the upper movable plate 5. The longitudinal axis 14 is curved along the side away from the buffer spring 4 and is provided with a relief portion 1401. The transverse axis 10 is provided with an anti-directional protrusion 1002 near the upper end of the upper movable plate 5. The diameter of the relief portion 1401 is smaller than the diameter of the smooth portion 1001 in the longitudinal axis 14. The diameter of the anti-directional protrusion 1002 is equal to the distance between the upper surface of the lower fixed plate 6 and the lower surface of the upper movable plate 5.

[0036] Solution Description: In the initial state, the clearance part 1401 does not contact the upper movable plate 5, mainly relying on its smooth part 1001. Since the diameter of the smooth part 1001 is equal to the vertical distance between the upper movable plate 5 and the lower fixed plate 6, the upper movable plate 5 always remains horizontal. Figure 6 For reference, when the longitudinal axis 14 rotates clockwise, the clearance portion 1401 is released from the upper movable plate 5, thereby Figure 6 The upper movable plate 5 in the middle deflects downward and tilts;

[0037] And reference Figure 5 It should be noted that in the initial state, the upper part of the running belt 3 needs to be kept horizontal so that the irregular protrusion 1002 is kept vertical. Then, the reverse can be understood as: as the irregular protrusion 1002 gradually deflects, the running belt 3 changes from tension to relaxation at a relatively slow speed.

[0038] The above two parts constitute the basic technical points of this invention. Specifically, the upper moving plate 5 is used to "consume" the single-leg "pressure" borne by the treadmill through active cushioning. Specifically, when the treadmill switches from low speed to high speed, the single-leg "pressure" borne by the upper moving plate 5 increases, resulting in a greater reaction force on the user's knee. During this process, the upper moving plate 5 forms an active pressure-reducing motion pattern. (Refer to...) Figure 6As shown, when an athlete steps on one of the upper movable plates 5 with one leg, the upper movable plate 5 tilts and deflects in an active manner. It can be understood that the reaction force generated by the single leg "pressure" applied to the upper movable plate 5 is reduced due to the tilting and deflecting action. Specifically, some of the single leg "pressure" is actively "consumed".

[0039] Furthermore, it should be explained that, based on the running posture, when the left leg steps on one of the upper movable plates 5, the athlete's right leg will definitely leave the other upper movable plate 5. Then, during the continuous running process, when the upper movable plate 5 on the left side is stepped on and actively deflects and tilts, the buffer spring 4 at that position is compressed. Subsequently, when the athlete's left leg leaves the upper movable plate 5 on the left side, the upper movable plate 5 on the left side tends to be horizontal, and the "release" process of energy in the buffer spring 4 will not directly act on the athlete's left leg. In this way, the active deflection, absorption of "energy" and release of "energy" continue, and in this process, it is crucial to change the reaction force of the upper movable plate 5 on the athlete's knee.

[0040] Example 3: This example proposes the following technical solution by combining the relevant technical content from Examples 1 and 2:

[0041] The drive assembly 2 in the overall device consists of a motor assembly and a controller. The motor assembly drives the running belt 3 to rotate, while the controller controls the operation of the motor assembly, the first motor 1, and the second motor 13. It mainly relies on the detection data in the pressure sensor 7, and the detection data in the pressure sensor 7 represents the pressure value. According to the setting position of the two sets of upper movable plates 5, they are respectively represented as Fz and Fy. Fz and Fy represent the pressure value of the pressure sensor 7 in the left position and the pressure value of the pressure sensor 7 in the right position, respectively. In use, the intermediate pressure value Fo is first set according to the weight of the athlete. If the athlete's weight is M, then Fo = k * M, where k > 1 and M is a relative constant. According to the running posture, if the human body runs at a low speed, the reaction force generated is approximately equal to the athlete's own weight. Therefore, the intermediate pressure value Fo in this embodiment is also a relative constant.

[0042] The treadmill belt 3 is set to i stages based on its speed, where i is a natural number. In stage i, the treadmill belt 3 runs at a low speed, and the pressure value of the pressure sensor 7 is close to or equal to the intermediate pressure value, which is then directly represented by Fo. In stage i+1, the treadmill belt 3 runs at a higher speed, and Fz or Fy is greater than Fo. Based on the upper movable plate 5 on the left side, after entering stage i+1, the pressure difference value N is calculated as N = (Fz - Fo) / Fo+1. The intermediate level of the pressure difference value N is set to 1.09. If N > 1.09, it indicates an abnormal state of sports injury during exercise. Conversely, if 1 < N < 1.09, it indicates a normal state during exercise.

[0043] Subsequently, in abnormal conditions where sports injuries exist, priority should be given to adjusting the longitudinal axis 14, specifically as follows: Figure 6 As shown, when the longitudinal axis 14 rotates clockwise, the upper movable plate 5 on the left side tilts downwards, and the second motor 13 corresponding to the longitudinal axis 14 coordinates with the athlete's step frequency. Specifically, when the athlete's left leg steps onto the upper movable plate 5 on the left side, the second motor 13 starts, driving the longitudinal axis 14 to rotate clockwise by an angle A. After the longitudinal axis 14 rotates clockwise by an angle A, the pressure value of the pressure sensor 7 at the corresponding position is recorded again, and the athlete's step frequency is set to T, where T represents 1, 2, 3...T-1. This results in multiple sets of data: Fz1, Fz2, Fz3...FzT. It should be noted that:

[0044] N was calculated based on FzT. T The pressure difference value, if N T If the value is greater than 1.09, then during the step frequency movement in step T+1, an angle enhancement process needs to be performed based on the rotation angle in step frequency T, so that the rotation angle in step frequency T+1 is optimized to A*[1+(N T-1 -N T Regarding this, it should be noted that the single rotation angle A is a small-amplitude fine-tuning, rather than a direct and large change in the tilt angle of the upper movable plate 5. If in the step frequency T+1, A*[1+(N T-1 -N T After fine-tuning, the calculated value is 1 < N. T+1 If <1.09, then in stage i+1, the upper active plate 5 will all use A*[1+(N)]. T-1 -N T The rotation angle of the [] symbol is used to deflect and tilt the object;

[0045] Conversely, when switching from a higher speed to a lower speed, the upper movable plate 5 does not perform the deflection and tilting action at first, but still performs the process of calculating the pressure difference value, and according to the state of N>1.09, performs the above deflection and tilting process again, and further optimizes the rotation angle of the upper movable plate 5 in a single step frequency.

[0046] Reference Figure 5 To explain, the lateral axis 10 does not support the upper movable plate 5, but only changes the tension of the running belt 3. Furthermore, the lateral axis 10 needs to move synchronously with the movement of the longitudinal axis 14. Therefore, it can be understood that the lateral axis 10 and the longitudinal axis 14 start synchronously. Specifically, when the athlete steps on one of the upper movable plates 5 with one leg, the lateral axis 10 rotates in a specific direction.

[0047] Specifically, the running belt 3 is changed from a fully taut state to a relaxed state, mainly to adapt to the deflection and tilting process of the upper movable plate 5. This is also one of the means of utilizing the elasticity of the running belt 3 itself. However, in the overall structure, the longitudinal axis 14 drives the upper movable plate 14 to deflect and tilt, thereby passively "reducing" the impact force difference on the athlete's knee. Its essence is to keep the impact force transmitted to the athlete's knee in a relatively balanced or low-fluctuation state, thereby indirectly playing a role in cushioning and shock absorption protection.

[0048] In summary, the inner support assembly of the running belt, optimized based on the conventional treadmill structure, essentially functions as follows: the upper movable plate of the inner support assembly, while serving as a support structure for the running belt, can exist independently and without interfering with the runner's running posture. During operation, it indirectly reflects the reaction force generated on the runner's knee based on the "pressure" applied by the runner's single leg to the corresponding position of the upper movable plate. Specifically, it employs a combination of passive and active deflection and tilting movements on the upper movable plate. Without affecting the exercise process, the "pressure" applied by the single leg passively forms reference data for the upper movable plate, prompting it to actively move. The impact force on the runner's knee remains relatively balanced or with low fluctuations, thus indirectly providing cushioning and shock absorption protection.

[0049] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0050] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flexible shock absorption device suitable for an automatic pacing treadmill, comprising a frame assembly (1), a drive assembly (2), and a running belt (3), characterized in that, The frame assembly (1) is provided with an inner support assembly in the position corresponding to the inside of the running belt (3). The inner support assembly includes a lower fixed plate (6), an upper movable plate (5), a drive roller (9), and a directional roller (8). The lower fixed plate (6) is installed in the frame assembly (1), and a connecting platform (12) is installed at the center point of the lower fixed plate (6). The upper movable plate (5) is symmetrically arranged along the connecting platform (12) in the width direction of the running belt (3), and the upper movable plate (5) and the connecting platform (12) are rotatably connected. The lower fixed plate (6) is provided with a longitudinal shaft (14) corresponding to the length direction of the running belt (3), and the lower fixed plate (6) is provided with a transverse shaft (10) corresponding to the width direction of the running belt (3). A pressure sensor (7) is installed on the lower fixed plate (6) at the diagonal point corresponding to the upper movable plate (5). A ball joint is installed at the transmission end of the pressure sensor (7), and the upper end of the ball joint corresponds to the upper movable plate (5). The lower fixed plate (6) is equipped with a first motor (11), a second motor (13), and a bearing seat corresponding to the transverse shaft (10) and the longitudinal shaft (14). The transverse shaft (10) is located at the middle position between the upper surface of the lower fixed plate (6) and the upper part of the running belt (3). The longitudinal shaft (14) is located at the middle position between the upper surface of the lower fixed plate (6) and the lower surface of the upper movable plate (5). The diameter of the smooth part (1001) in the longitudinal shaft (14) is equal to the distance between the upper surface of the lower fixed plate (6) and the lower surface of the upper movable plate (5). The diameter of the smooth part (1001) in the transverse shaft (10) is smaller than the distance between the upper surface of the lower fixed plate (6) and the lower surface of the upper movable plate (5). The longitudinal shaft (14) is set as a relief part (1401) along the curved surface away from the buffer spring (4). The upper end of the transverse shaft (10) near the upper movable plate (5) is set as an anti-directional protrusion (1002).

2. The flexible shock absorption device suitable for an automatic pacing treadmill according to claim 1, characterized in that, The distance between the lower surface of the lower fixed plate (6) and the upper surface of the upper movable plate (5) is equal to the gap height of the running belt (3) in the vertical direction. The drive roller (9) is set at both ends of the running belt (3). The directional roller (8) is tangent to the inner contour line of the running belt (3).

3. A flexible shock absorption device suitable for an automatic pacing treadmill according to claim 1, characterized in that, A buffer spring (4) is installed on the upper surface of the lower fixed plate (6) at the position corresponding to the upper movable plate (5), and the upper end of the buffer spring (4) is connected to the upper movable plate (5).

4. A flexible shock absorption device suitable for an automatic pacing treadmill according to claim 1, characterized in that, The positions of the transverse axis (10) and the longitudinal axis (14) corresponding to the lower fixing plate (6) are set as smooth parts (1001), and the lower curved surfaces of the smooth parts (1001) corresponding to the transverse axis (10) and the longitudinal axis (14) are tangent to the upper surface of the lower fixing plate (6).

5. A flexible shock absorption device suitable for an automatic pacing treadmill according to claim 1, characterized in that, The diameter of the clearance portion (1401) is smaller than the diameter of the smooth portion (1001) in the longitudinal shaft (14), and the diameter of the anisotropic protrusion (1002) is equal to the distance between the upper surface of the lower fixed plate (6) and the lower surface of the upper movable plate (5).

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