Elliptical trainer
The elliptical trainer simulates natural heel-to-toe walking or running movements and adjusts resistance for varied training loads, addressing posture issues and enhancing muscle engagement.
Patent Information
- Application Number
- DE202025100473
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-01-30
- Publication Date
- 2025-04-03
- Estimated Expiration
- 2035-01-31
AI Technical Summary
Existing elliptical trainers do not accurately simulate the natural movement of walking or running, leading to potential foot posture issues due to toes being raised to the front edge, which can cause damage over time.
An elliptical trainer design featuring a frame with specific pivot points and chain units that allow the foot pedals to move in a closed path, mimicking the natural heel-to-toe movement of walking or running, while incorporating adjustable resistance for varying training loads.
The design effectively simulates walking and running movements, engaging both lower and upper limbs, and allows for adjustable resistance to enhance training intensity, reducing the risk of foot posture-related injuries.
Smart Images
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Abstract
Description
BACKGROUND OF THE INVENTION (a) Context of the invention
[0001] The present invention relates to a trainer, in particular an elliptical trainer, designed to simulate the actions of walking. (b) Description of the known design
[0002] The gym has various training equipment for physical exercise, such as treadmills, spinning bikes, dumbbells, leg presses, rowing machines, glute kickback machines, and so on.
[0003] To train multiple muscle groups with a single machine, an elliptical trainer is often used. An elliptical trainer is a stationary exercise machine that simulates the actions of cycling, stair climbing, rowing, and running. An elliptical trainer is also known as a cross trainer.
[0004] Patent publication No. TWM383421U from Taiwan describes an elliptical walking machine capable of adjusting stride length. A rotating wheel mount and a rotating wheel are arranged at the front end of a base. A side frame is located on both sides of the base. At the upper end of the side frame is an inward-facing pivot point. A movable linkage is located on each side of the base. The walking linkage is pivotally attached to the shaft of the rotating wheel and the pivot shaft. The connection between a rear connecting rod and a lower connecting rod of the walking linkage is rotated by an adjustable connecting seat that can slide up and down, thus allowing adjustment of the trajectory and stride length of the elliptical walking machine. A pedal rod of the walking linkage is equipped with an up-and-down oscillating pedal bearing.Adjusting the mounting angle between the foot pedal and the pedal bar can effectively improve the comfort for the user's ankles during training.
[0005] Patent publication No. TWI671098B from Taiwan describes a multifunctional elliptical trainer that can automatically determine the stride length and comprises a frame unit, a resistance unit, a gear unit, and two linkage units. The resistance unit includes a first resistance element and a second resistance element. The gear unit comprises a crank drive link, a first gear unit connected between the crank drive link and the first resistance element, and a second gear unit attached to the second resistance element. Each linkage can switch between an up-and-down motion and a forward-and-backward motion. In the up-and-down motion state, the linkage unit sequentially drives the crank drive link, the first gear unit, and the first resistance element.In the forward-backward motion, the connecting unit sequentially drives the second gear unit and the second resistance element. Since the components driven by the connecting unit are different in the up-and-down and forward-and-backward motions, there is no limit to the stride length in either direction, allowing the user to adjust the stride length for a more effective workout. During use, the foot pedal is always tilted forward. When the foot pedal is moved to its forwardmost position, the user's foot, moving towards the front edge, will step onto the pedal on their toes. Prolonged use of this position can lead to foot damage due to poor posture. SUMMARY OF THE INVENTION
[0006] The main objective of the present invention is to create an elliptical trainer with which the actual walking or running motion of the human body can be simulated, i.e., the toes of the foot moving towards the front edge are raised and the heel of the foot moving towards the rear edge is raised.
[0007] The elliptical trainer created by the present invention comprises a frame, two pedal bearings, two connecting units, and a resistance unit. The frame includes a base, a post, and a front connecting bracket. The base extends horizontally. The post is attached to the base and projects vertically. The front connecting bracket is attached between the base and the post. The frame has a first rotating part, a second rotating part, and a third rotating part, arranged vertically from top to bottom along the frame. The second rotating part is located horizontally between the first and third rotating parts. The first and second rotating parts are mounted on the post. The third rotating part is mounted on the front connecting bracket. Two pedal bearings are arranged on opposite sides of the frame.The pedal assembly comprises a steering rod, a pedal shaft, a pedal lower shaft, and a foot pedal. The foot pedal has a pedal surface. The upper and lower ends of the steering rod are pivotally attached to the first pivot point and to one end of the pedal lower shaft, respectively. Another end of the lower pedal shaft is pivotally attached to a lower pivot point of the foot pedal. One end of the pedal shaft is pivotally attached to an upper pivot point of the foot pedal. The upper and lower pivot points are positioned vertically adjacent to each other. The pedal shaft has a connection point for the pedal shaft between its two opposite ends. The steering rod has a connection point between its upper and lower ends. The connection point for the pedal shaft is connected to the connection point of the steering rod, so that the pedal shaft is pivotally attached to the steering rod.On opposite sides of the frame are two linkage units, each connected to the two pedal bearings. Each linkage unit comprises a first beam, a second beam, a third beam, a fourth beam, and a connecting element for the rotating shaft. One end of the first beam is pivotally attached to the second rotating part. Another end of the first beam is pivotally attached to one end of the second beam. Another end of the second beam and one end of the third beam are pivotally attached to one end of the connecting element for the rotating shaft. Another end of the connecting element for the rotating shaft is pivotally attached to the third rotating part. The connecting elements for the rotating shaft of the two linkage units on either side of the frame are offset by 180 degrees radially from the third rotating part.The first beam has a first connection point between its two opposite ends. The fourth beam has a fourth connection point between its two opposite ends. One end of the fourth beam is pivotally attached to its first connection point. Another end of the third beam is pivotally attached to the connection point of the fourth beam. The other end of the fourth beam is pivotally attached to the other end of the pedal bar. The resistance unit is mounted on the frame and attached to the third pivot point. The two pedal bearings are attached to the resistance unit via the corresponding linkage units. In use, the foot pedals of the two pedal bearings on either side of the frame are driven to move along a closed path, with the two foot pedals positioned on opposite sides of the center of the closed path when in motion.When the two foot pedals are moved and are located on opposite sides of the center of the closed path in a horizontal direction, the pedal surfaces of the two foot pedals are inclined at an angle to the center of the closed path.
[0008] Preferably, the first beam, the second beam, the third beam and the fourth beam are connected to form a four-part rod.
[0009] Preferably, a first distance from the connection point of the steering rod to the lower end of the steering rod connected to the pedal lower rod is less than a second distance between the upper pivot point and the lower pivot point.
[0010] Preferably, each pedal bearing includes a movable steering rod. The movable steering rod is attached to the upper end of the steering rod. The two movable steering rods of the pedal bearings extend vertically and have a gradually widened section and a gripping element.
[0011] Preferably, the frame also includes an upper arm, two fixed steering rods, and a display screen. The upper arm extends vertically and is attached to the post. The two fixed steering rods are attached to opposite sides of the upper arm. The display screen is attached to one end of the upper arm.
[0012] Preferably, the base consists of a main body and two crossbeams. The two crossbeams are attached to two opposite ends of the main body. Each of the two crossbeams has two support feet and two guide wheels.
[0013] Preferably, the frame includes two side armrests. The front ends of the two side armrests are attached to two opposite sides of the post. The rear ends of the two side armrests are attached to one of the rear crossbeams. The two pedal bearings are located between the two side armrests.
[0014] Preferably, the front connecting bracket comprises a left connecting bracket and a right connecting bracket. The left and right connecting brackets are arranged at a specific distance from each other. The third rotating part comprises two shaft seats and a rotatable shaft. The two shaft seats are attached to the left and right connecting brackets, respectively. The rotating shaft is rotatably connected to the two shaft seats.
[0015] Preferably, the third rotating part also includes two adjusting screws. The two adjusting screws are arranged next to the two shaft seats. Each of the two adjusting screws has two setscrews. The two adjusting screws are rotatable and each rests against two opposite ends of a corresponding shaft seat.
[0016] Preferably, the resistance unit comprises a driven wheel, a gear wheel, and a resistance wheel. The driven wheel is mounted on the rotating shaft and rotates synchronously with it. The gear wheel and the resistance wheel are rotatably mounted on the frame. The driven wheel provides the drive and is connected to the driven wheel via a first belt. The gear wheel drives the resistance wheel and is connected to it via a second belt.
[0017] According to the above-mentioned technical features, the following effects can be achieved with the present invention: 1. The elliptical trainer can be used to train cycling, stair climbing, and rowing. When the user's feet are on the pedals for exercise, the toes of the foot moving towards the front edge are lifted, and the heel of the foot moving towards the back edge is lifted. The movements are closer to actual walking or running. 2. The user can not only train their lower limbs, but also grip the movable handlebars to simulate the rowing motion, thus simultaneously training their upper limbs. And when the upper limbs do not need to be trained, the user can rest their hands on the side armrests or the stationary handlebars. 3. By adjusting the resistance of the resistance wheel, the force required to drive the foot pedals can be adjusted to increase or decrease the training load. BRIEF DESCRIPTION OF THE DRAWINGS The Fig. Figure 1 shows a perspective view of the present invention; The Fig. Figure 2 shows another perspective view of the present invention; The Fig. Figure 3 shows a perspective view of the framework of the present invention; The Fig. Figure 4 shows a schematic view illustrating the positions of the first rotating part and the second rotating part of the frame of the present invention; The Fig. Figure 5 shows a schematic view to illustrate the position of the third rotating part of the frame of the present invention; The Fig. Figure 6 shows a schematic view illustrating the linkage unit and pedal bearing on the right side of the frame of the present invention; The Fig. Figure 7 shows a partial exploded view to illustrate the right-hand linking unit, which is pivotably attached to the third rotating part of the present invention; The Fig. Figure 8 shows a side view of the Fig. 6; The Fig. Figure 9 shows a schematic view illustrating the linkage unit and pedal bearing on the left side of the frame of the present invention; The Fig. Figure 10 shows a partial exploded view to illustrate the left linking unit, which is pivotably attached to the third rotating part of the present invention; The Fig. 11 shows a side view of the Fig. 9; The Fig. Figure 12 shows a perspective view of the resistor unit attached to the frame of the present invention; The Fig. Figure 13 shows another perspective view of the resistance unit of the present invention; The Fig. Figure 14 shows a perspective partial view of the resistance unit of the present invention; The Fig. Figure 15 shows a schematic view of the present invention in operation, wherein the foot pedals are moved along the closed path and the right foot pedal is higher than the left foot pedal; The Fig. Figure 16 shows a schematic view of the present invention in operation, wherein the foot pedals are moved along the closed path and the right foot pedal is in front of the left foot pedal; The Fig. Figure 17 shows a schematic view of the present invention in operation, wherein the foot pedals are moved along the closed path and the right foot pedal is lower than the left foot pedal; and The Fig. Figure 18 shows a schematic view of the present invention in operation, wherein the foot pedals are moved along the closed path and the right foot pedal is behind the left foot pedal. DETAILED DESCRIPTION OF PREFERRED EXECUTION EXAMPLES
[0018] The embodiments of the present invention are described below only by way of example with reference to the accompanying drawings.
[0019] The Fig. 1 to Fig. Figure 5 shows that the present invention relates to an elliptical trainer comprising a frame 1, two pedal bearings 2, two linking units 3, a resistance unit 4, a first rotating part 5, a second rotating part 6 and a third rotating part 7.
[0020] The frame 1 consists of a base 11, a post 12, an upper arm 13, a front connecting bracket 14, two fixed handlebars 15, two side armrests 16 and a display screen 17.
[0021] The base 11 extends horizontally. The post 12 is attached to the base 11 and extends vertically. The upper arm 13 extends vertically and is attached to one end of the post 12. The display screen 17 is attached to one end of the upper arm 13. The base 11 consists of a base body 111 and two crossbeams 112. The two crossbeams 112 are attached to opposite ends of the base body 111 and are perpendicular to the base body 111. Two support feet 113 and two guide wheels 114 are attached to the underside of one of the crossbeams 112. Two support feet 113 are attached to the underside of the other crossbeam 112.
[0022] The front connecting bracket 14 is attached between the base 11 and the post 12. In particular, the front connecting bracket 14 comprises a left connecting bracket 141 and a right connecting bracket 142. The left connecting bracket 141 and the right connecting bracket 142 are arranged at a specific distance from each other.
[0023] The two fixed handlebars 15 are attached to two sides of the upper arm 13. The front ends of the two side armrests 16 are attached to two opposite sides of the post 12. The rear ends of the two side armrests 16 are attached to the other of the crossbeams 112. The two pedal bearings 2 are located between the two side armrests 16. The display screen 17 is attached to the upper end of the upper arm 13.
[0024] The first rotating part 5, the second rotating part 6, and the third rotating part 7 are arranged vertically, one after the other, from top to bottom on the frame 1. The second rotating part 6 is located horizontally between the first rotating part 5 and the third rotating part 7. The first rotating part 5 and the second rotating part 6 are arranged on the post 12. The third rotating part 7 is arranged on the front connecting bracket 14. The post 12 has a first receiving groove 121 and a second receiving groove 122. The first rotating part 5 is inserted into the first receiving groove 121. The second rotating part 6 is inserted into the second receiving groove 122. The third rotating part 7 comprises two shaft seats 71, two adjusting screws 72, and a rotating shaft 73. The two shaft seats 71 are attached to the left connecting bracket 141 and the right connecting bracket 142, respectively. The rotating shaft 73 is rotatably attached to the two shaft seats 71.The two adjusting screws 72 are each arranged next to the two shaft seats 71. Each adjusting screw 72 has two adjusting screws 721. The two adjusting screws 721 are rotatable in the direction of extension of the front connecting bracket 14 and each bear against two opposite ends of the shaft seat 71.
[0025] The Fig. Figure 6 shows that the two pedal units 2 are arranged on two opposite sides of the frame 1. Each pedal unit 2 comprises a movable handlebar 21, a steering rod 22, a pedal rod 23, a pedal base rod 24, and a foot pedal 25. The foot pedal 25 has a pedal surface 251.
[0026] The upper and lower ends of the steering rod 22 are pivotally connected to the first pivot part 5 and one end of the lower pedal base rod 24, respectively. The other end of the lower pedal base rod 24 is pivotally attached to a lower pivot point 252 of the foot pedal 25. One end of the pedal rod 23 is pivotally attached to an upper pivot point 253 of the foot pedal 25. The upper pivot point 253 and the lower pivot point 252 are arranged next to each other vertically. The pedal rod 23 has a connection point for the pedal rod 231 between its two opposite ends. The steering rod 22 has a connection point for the steering rod 223 between its upper and lower ends. The connection point for the pedal rod 231 is connected to the connection point of the steering rod 223, so that the pedal rod 23 is pivotally attached to the steering rod 22. The movable handlebar 21 is attached to the upper end of the steering rod 22.The two movable steering rods 21 extend vertically and have a gradually increasing section and a gripping element. Specifically, the steering rod 22 comprises a rod-shaped profile 221 and a U-shaped cross-section 222, which is attached to the rod-shaped profile 221. The rod-shaped profile 221 is attached to the first pivoting element 5. The U-shaped cross-section 222 is attached to one end of the pedal lower rod 24. The U-shaped cross-section 222 has the connection point of the steering rod 223. The pedal rod 23 is inserted through the U-shaped cross-section 222, while the connection point for the pedal rod 231 is pivotably attached to the connection point of the steering rod 223. A first distance a from the connection point of the steering rod 223 to the lower end of the steering rod 22 attached to the pedal lower rod 24 is smaller than a second distance b between the upper pivot point 253 and the lower pivot point 252.
[0027] The two linking units 3 are arranged on the two opposite sides of the frame 1 and are each attached to the two pedal bearings 2. Each linking unit 3 comprises a first beam 31, a second beam 32, a third beam 33, a fourth beam 34 and a connecting element 35 of the rotating shaft 35.
[0028] One end of the first beam 31 is pivotally attached to the second rotating part 6. The other end of the first beam 31 is pivotally attached to one end of the second beam 32. The other end of the second beam 32 and one end of the third beam 33 are pivotally attached to one end of the connecting element of the rotating shaft 35. The other end of the connecting element of the rotating shaft 35 is pivotally attached to the third rotating part 7. The connecting elements of the rotating shafts 35 of the two linking units 3 on both sides of the frame 1 are arranged radially offset by 180 degrees from the third rotating part 7. The first beam 31 has a first connection point of beam 311 between the two opposite ends of the first beam 31. The fourth beam 34 has a fourth connection point of beam 341 between the two opposite ends of the fourth beam 34.One end of the fourth beam 34 is pivotally attached to the first connection point of beam 311. The other end of the third beam 33 is pivotally attached to the fourth connection point of beam 341. The other end of the fourth beam 34 is rotatably attached to the other end of the pedal rod 23. In particular, the first beam 31, the second beam 32, the third beam 33, and the fourth beam 34 are connected to each other to form a four-part linkage. One end of the second beam 32 is U-shaped. The two opposite ends of the fourth beam 34 and the fourth connection point of beam 341 are U-shaped. The other end of the connecting element of the rotating shaft 35 has a clamping groove 351. The end of the rotating shaft 73 is secured by the clamping groove 351, so that the connecting element of the rotating shaft 35 rotates synchronously with the rotating shaft 73.
[0029] The Fig. 1, Fig. 12, Fig. 13 and Fig. Figure 14 shows that the resistance unit 4 is arranged on the frame 1 and attached to the third rotating part 7. The two pedal bearings 2 are attached to the resistance unit 4 via the corresponding linkage units 3. Specifically, the resistance unit 4 comprises a driven gear 41, a gear wheel 42, a tensioning gear set 43, and a resistance wheel 44. The driven gear 41 is arranged on the rotating shaft 73 and rotates synchronously with the rotating shaft 73. The driven gear 41 is located within the specified distance and between the left connecting bracket 141 and the right connecting bracket 142.
[0030] The gear wheel 42 and the resistance wheel 44 are rotatably mounted on the frame 1. The output wheel 41 drives the gear wheel 42 and is connected to it via a first belt 45. The gear wheel 42 is located on the front connecting bracket 14 near the post 12. Two support plates 143 are provided on the front connecting bracket 14. Each of the two support plates 143 has a bearing and a bearing seat. The gear wheel 42 has a transmission shaft 421 and a gear wheel body 422. The transmission shaft 421 passes through the bearing and the bearing seat. The gear wheel body 422 is attached to the transmission shaft 421 and rotates synchronously with it. The first belt 45 is wound around the output wheel 41 and the transmission shaft 421. A second belt 46 is wound around the gear wheel body 422 and the resistance wheel 44. The tensioning wheel set 43 comprises a swivel arm 431, a tensioning wheel body 432, a pull rod 433 and an adjusting nut 434.The tensioning wheel body 432 is pivotable and attached to one of the support plates 143 via the swivel arm 431. The tensioning wheel body 432 rests against the first belt 45. The adjusting nut 434 is adjustable and located on the drawbar 433. One end of the drawbar 433 is attached to the swivel arm 431. The other end of the drawbar 433 passes through the right connecting bracket 142, with the position of the drawbar 433 being limited by the adjusting nut 434, thereby changing the force exerted by the tensioning wheel body 432 on the first belt 45.
[0031] The Fig. 15, Fig. 16, Fig. 17 and Fig.Figure 18 shows that the user, when using the device, presses both feet onto the foot pedals 25, which are located on both sides of the frame 1. Pressing the foot pedals 25 drives the pedal bearings 2 and the linkage units 3, causing the foot pedals 25 located on both sides of the frame 1 to move along a closed path. The two foot pedals 25 are located on opposite sides of the center of the closed path when they are in motion. When the two foot pedals 25 are in motion and are located horizontally on opposite sides of the center of the closed path, the pedal surfaces 251 of the two foot pedals 25 are inclined at an angle to the center of the closed path. This simulates the back-and-forth movement of the feet, i.e.,The toes of the foot moving towards the front edge are lifted, and those of the foot moving towards the back edge are lifted, so that the movements are closer to actual walking or running.
[0032] An elliptical trainer thus consists of a frame (1); two pedal bearings (2) arranged on two opposite sides of the frame (1); two linkage units (3) arranged on the two opposite sides of the frame (1) and attached to the two pedal bearings (2); and a resistance unit (4) arranged on the frame (1). The two pedal bearings (2) are attached to the resistance unit (4) via the corresponding linkage units (3).
[0033] Despite the detailed description of specific embodiments of the present invention for illustrative purposes, it is understood that various modifications and improvements can be made without deviating from the spirit and scope of the present invention. Accordingly, the present invention is to be limited only by the attached claims.
Claims
[1] Elliptical trainer, including: a frame (1) with a base (11), a post (12) and a front connecting bracket (14), the base (11) extends horizontally, the post (12) is fixed to the base (11) and extends vertically, the front connecting bracket (14) is arranged between the base (11) and the post (12) is attached, the frame (1) has a first rotating part (5), a second rotating part (6) and a third rotating part (7) which are arranged on the frame (1) one after the other from high to low in the height direction, the second rotating part (6) is arranged between the first rotating part (5) and the third rotating part (7) in the horizontal direction, the first rotating part (5) and the second rotating part (6) are arranged on the post (12), the third rotating part (7) is arranged on the front connecting bracket (14); two pedal bearings (2) arranged on two opposite sides of the frame (1), the pedal bearings (2) each comprising a handlebar (22), a pedal rod (23) and a foot pedal (25), wherein the foot pedal (25) has a pedal surface (251), one end of the handlebar (22) is pivotally attached to the first pivot part (5), one end of the pedal rod (23) is pivotally attached to an upper pivot point (253) of the foot pedal (25), the pedal rod (23) has a connection point for the pedal rod (231) between two opposite ends thereof, the handlebar (22) has a connection point for the pedal rod (231) between the upper and lower ends of the handlebar, the connection point for the pedal rod (231) being attached to the connection point of the handlebar (223), so that the pedal rod (23) is pivotally attached to the handlebar (22); two linking units (3) arranged on the two opposite sides of the frame (1) and attached to the two pedal bearings (2), the linking units (3), each of which has a first beam (31), a second beam (32), a third beam (33), a fourth beam (34) and a connecting element of the rotating shaft (35), one end of the first beam (31) is pivotally attached to the second rotating part (6), another end of the first beam (31) is attached to one end of the second beam (32), another end of the second beam (32) and one end of the third beam (33) are pivotally attached to one end of the connecting element of the rotating shaft (35), another end of the connecting element of the rotating shaft (35) is pivotally attached to the third rotating part (7), the connecting element of the rotating shaft (35) of the two linking units (3) on the two sides of the frame (1), which are arranged at a distance of 180 degrees from each other in the radial direction of the third rotating part (7);wherein the first beam (31) has a first connection point of the beam (311) between the two opposite ends of the first beam (31), the fourth beam (34) has a fourth connection point of the beam (341) between two opposite ends of the fourth beam (34), the fourth beam (34) is pivotally attached to the first connection point of the beam (311), another end of the third beam (33) is pivotally attached to the fourth connection point of the beam (341), the fourth beam (34) is pivotally attached to the other end of the pedal rod (23); a resistance unit (4) arranged on the frame (1) and fastened to the third rotating part (7), the two pedal bearings (2) being fastened to the resistance unit (4) via the corresponding linking units (3); wherein, during use, the foot pedals (25) of the two pedal bearings (2) on the two sides of the frame (1) are driven to move along a closed path, the two foot pedals (25) being located on two opposite sides of a center point of the closed path when moving. [2] The elliptical trainer of claim 1, wherein the first beam (31), the second beam (32), the third beam (33) and the fourth beam (34) are attached to form a four-link linkage. [3] Elliptical trainer according to claim 1, wherein the respective pedal bearing (2) has a pedal lower rod (24), the other end of the handlebar (22) being pivotally attached to one end of the pedal lower rod (24), wherein; wherein a first distance from the connection point of the handlebar (223) to the lower end of the handlebar (22) attached to the pedal lower rod (24) is less than a second distance between the upper pivot point (253) and the lower pivot point (252); wherein the pedal surfaces (251) of the two foot pedals (25) are inclined at an angle to the center of the closed path when the two foot pedals (25) are moved and are located on the two opposite sides of the center of the closed path in the horizontal direction. [4] Elliptical trainer according to claim 1, wherein the pedal bearings (2) each comprise a movable handlebar (21), the movable handlebar (21) is fixed to the upper end of the handlebar (22), and the two movable handlebars (21) of the pedal bearings (2) extend in the height direction and have a gradually enlarged portion and a gripping part. [5] The elliptical trainer according to claim 1, wherein the frame (1) further comprises an upper arm (13), two fixed links (21) and a display screen (17), the upper arm (13) extends in the height direction and is fixed to the support (12), the two fixed links (21) are fixed to two sides of the upper arm (13), and the display screen (17) is fixed to an upper end of the upper arm (13). [6] Elliptical trainer according to claim 1, wherein the base (11) comprises a main body (111) and two cross beams (112), the two cross beams (112) are attached to two opposite ends of the main body (111), and the two cross beams (112) each have two support feet (113) and two guide wheels (114). [7] Elliptical trainer according to claim 6, wherein the frame (1) comprises two lateral armrests (16), the front ends of the two lateral armrests (16) are attached to two opposite sides of the post (12), the rear ends of the two lateral armrests (16) are connected to one of the rear of the two cross members (112) and the two pedal bearings (2) are arranged between the two lateral armrests (16). [8] Elliptical trainer according to claim 1, wherein the front connecting bracket (14) comprises a left connecting bracket (141) and a right connecting bracket (142), the left connecting bracket (141) and the right connecting bracket (142) are arranged at a certain distance from each other, the third rotating part (7) comprises two shaft seats (71) and a rotating shaft (73), the two shaft seats (71) are respectively fixed to the left connecting bracket (141) and the right connecting bracket (142), the rotating shaft (73) being rotatably fixed to the two shaft seats (71). [9] Elliptical trainer according to claim 8, wherein the third rotating part (7) further comprises two adjusting screws (72), the two adjusting screws (72) are each arranged side by side on the two shaft seats (71), the two adjusting screws (72) each have two adjusting screws (721), and the two adjusting screws (721) are rotatable and lie against two opposite ends of a corresponding one of the shaft seats (71). [10] Elliptical trainer according to claim 8, wherein the resistance unit (4) comprises a driven gear (41), a gear gear (42) and a resistance gear (44), the driven gear (41) is arranged on the rotating shaft (73) and rotates synchronously with the rotating shaft (73), the gear gear (42) and the resistance gear (44) are rotatably attached to the frame (1), the driven gear (41) drives and is attached to the gear gear (42) via a first belt (45) and drives the gear gear (42) and is connected to the resistance gear (44) via a second belt (46).