CN114307049A - Elliptical machine for body building - Google Patents

Abstract

The invention discloses an elliptical machine for body building, which comprises a main frame, a track, an adjusting assembly and two sliding pedal connecting rod assemblies symmetrically arranged on two sides of the main frame, wherein the main frame at least comprises an underframe; the adjusting assembly is a length-adjustable assembly, the length-adjustable assembly is coupled and arranged between the second end of the adjacent track and the underframe of the main frame, and the length-adjustable assembly, the second end of the adjacent track and the underframe form a triangular structure so as to adjust and fix the inclination angle of the track relative to the underframe. Through the structure, the inclination angle of the track can be conveniently adjusted, so that the height of the pedal can be adjusted to adapt to users with different heights, and the adaptability is stronger.

Description

Elliptical machine for body building

Technical Field

The invention relates to the technical field of fitness equipment, in particular to an elliptical machine for fitness.

Background

An elliptical machine, also called a spacewalk machine, is an instrument for exercising the functions of heart and lung, and the elliptical machine in the prior art has the main structure that a flywheel and other parts are arranged in a bottom frame and connected with pedals positioned at two sides of the bottom frame, and a user drives the flywheel to rotate by treading the two pedals, thereby achieving the effect of exercising hands, waist and legs simultaneously.

But the footboard inclination of traditional elliptical machine is fixed, and the user can't be according to the inclination of self height regulation footboard, probably appears because of the footboard is too high or low excessively, leads to the improper motion, appears muscle damage scheduling problem on the contrary, reduces user's use impression. Or the way of adjusting the inclination angle of the pedal of the elliptical trainer is troublesome and complicated, such as the Chinese invention patent number 'CN 201720848328.8', the patent name is 'a mechanism for adjusting the gradient of the pedal', the mechanism comprises an underframe and a guide rail frame which is rotationally connected with the underframe is disclosed; the lifting component is connected between the bottom frame and the guide rail frame; the lifting assembly comprises a lifting motor and a rotating connecting piece, the lifting motor is movably connected to the bottom frame, the other end of the lifting motor is movably connected with the rotating connecting piece through a telescopic rod, and a rolling wheel set is further arranged on the rotating connecting piece; the guide rail frame is provided with a guide rail support, and the self weight of the guide rail support falls on the rolling wheel set so as to enable the rolling wheel to roll along the guide rail support; this application makes the direct application of force to the guide rail frame of rolling wheelset through adopting the flexible of lift motor telescopic link to reach the mesh that the footboard slope was adjusted. The application has a complex structure and needs to be additionally provided with a lifting motor; in addition, the user needs to adjust the telescopic rod of the lifting motor, the position of the telescopic rod is hidden, the operation process is very inconvenient, and the adjusting process wastes time and energy.

Disclosure of Invention

Therefore, the invention provides an elliptical machine for fitness, which is used for solving the technical problem that the inclination angle of a pedal cannot be adjusted or is inconvenient to adjust.

The invention is realized by adopting the following technical scheme:

the invention provides an elliptical machine for body building, which comprises a main frame, a track, an adjusting assembly and two sliding pedal connecting rod assemblies symmetrically arranged on two sides of the main frame, wherein the main frame at least comprises an underframe; the adjusting assembly is a length-adjustable assembly, the length-adjustable assembly is coupled and arranged between the second end of the adjacent track and the underframe of the main frame, and the length-adjustable assembly, the second end of the adjacent track and the underframe form a triangular structure so as to adjust and fix the inclination angle of the track relative to the underframe.

Wherein, for the convenient adjustable subassembly of regulation length, the adjustable subassembly of length specifically is adjustable length and fixed flexible loop bar subassembly, has stiff end and expansion end, the stiff end pivot is established and is connected the chassis, the expansion end is also pivoted and is established the connection and is in the track.

Wherein, based on the consideration of installation convenience and assembly optimization, the adjustable length subassembly includes that the outer tube of mutual sliding sleeve, slide bar and be used for to the slide bar be in the adjustable locating component that the position of outer tube was injectd, the outer end of outer tube is as the stiff end, the outer end of slide bar is as the expansion end.

Wherein, for the convenience to the slide bar operate, adjustable locating component includes: the sliding rod is provided with a plurality of gear clamping holes arranged along the length direction of the outer sleeve, a clamping block arranged at the inner end of the sliding rod and an operation assembly for driving the clamping block to move, the operation assembly drives the clamping block to move, so that the clamping block is clamped into one of the gear clamping holes to carry out position limitation or the clamping block is separated from the gear clamping holes to carry out length adjustment.

Based on the consideration of the clamping stability of the fixture blocks and the gear clamping holes, the two gear clamping holes are symmetrically formed in the two side walls of the outer sleeve, the two fixture blocks are symmetrically arranged on the two sides of the inner end of the sliding rod, the two fixture blocks are driven to move through the operation assembly, so that the two fixture blocks are clamped into one of the two side walls of the outer sleeve at the same time, the gear clamping holes are formed in the two fixture blocks, or the two fixture blocks are separated from the gear clamping holes.

Based on the consideration of installation convenience and assembly optimization, the two fixture blocks comprise a first lug, a second lug and a butting part which are sequentially arranged from inside to outside, the first lug is used for being clamped and matched with the gear clamping hole, the second lug comprises a butting surface used for being abutted against the inner end of the sliding rod, the operating component comprises a pushing block, the pushing block is provided with two inclined pushing surfaces which respectively act with the butting parts of the two fixture blocks, and the inclined pushing surfaces respectively and the butting parts of the two fixture blocks obliquely slide along the inclined pushing surfaces by driving the pushing block to move, so that the first lugs of the two fixture blocks are driven to be far away or close, and the two fixture blocks are clamped into the gear clamping hole or separated from the gear clamping hole; and the elastic resetting piece applies force to the two clamping blocks to reset reversely.

Wherein, in order to guarantee that the motion of fixture block is more smooth and easy steady, seted up the recess on the both sides wall of the inner of slide bar, the bottom surface of recess is in order to supply the second lug the butt face supports and leans on, two the fixture block is in the position of the opposite side of second lug is equipped with the articulated shaft, passes through the round pin axle the articulated shaft with the slide bar is so that the fixture block can rotate relatively.

In order to ensure that the width of the groove is consistent with the thickness of the second bump under the limiting action of the sliding rod on the second bump, the thickness of the hinge shaft is consistent with the thickness of the sliding rod so as to limit the clamping block.

The operating assembly further comprises an operating end, the operating end is connected with an elastic piece, the pushing block is connected with the operating end through a connecting rod, the operating end is exposed out of the outer end of the sliding rod, the operating end is operated to drive the pushing block to move, and the elastic piece applies force to the connecting rod to perform reverse reset.

Based on the consideration of the use of the user, the outer end of the sliding rod is further connected with an operating handle, and a through hole for extending the operating end is formed in the operating handle.

After the scheme is adopted, the invention has the following beneficial effects: the first end of the track is pivotally connected with the underframe, the adjusting component is a length-adjustable component and is coupled between the second end adjacent to the track and the underframe of the main frame, and the length-adjustable component, the second end adjacent to the track and the underframe of the main frame form a triangular structure.

The invention is described in further detail below with reference to the figures and the specific embodiments.

Drawings

FIG. 1 is a perspective partially exploded view of an embodiment;

FIG. 2 is a first schematic view of an angle configuration according to an embodiment;

FIG. 3 is a second schematic structural view of another embodiment;

FIG. 4 is a schematic structural view of an adjustment assembly of an embodiment;

FIG. 5 is a first cross-sectional view at one of the angles of FIG. 4;

FIG. 6 is an exploded schematic view of an adjustment assembly of an embodiment;

FIG. 7 is a second cross-sectional view of another angle of the embodiment;

fig. 8 is a schematic structural diagram of a cartridge according to an embodiment.

Description of reference numerals:

the device comprises a main frame 1, an underframe 11, a mounting groove 111, a vertical frame 12 and a flywheel 13;

track 2, first end 21, second end 22;

the adjusting component 3, a fixed end 301, a movable end 302, a sliding support sleeve 303, an outer sleeve 31, a gear clamping hole 311, a sliding rod 32 and a groove 321;

the sliding and stepping connecting rod assembly 4, the first movable rod 41, the pedal 411, the second movable rod 42, the rolling piece 421, the crank 43 and the handle 431;

the adjustable positioning component 5, the latch 51, the first protrusion 511, the second protrusion 512, the abutting surface 5121, the abutting portion 513, the elastic reset piece 514, the hinge shaft 515, the operating component 52, the pushing block 521, the inclined pushing surface 5211, the operating end 522, the elastic piece 5221, the connecting rod 5222 and the operating handle 523.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

Meanwhile, the directions of front, rear, left, right, and the like referred to in the present embodiment are only used as a reference for one direction, and do not represent directions in actual use.

The invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1 to 8, the elliptical exercise machine for exercise includes a main frame 1, a rail 2, an adjusting assembly 3, and two sliding pedal connecting rod assemblies 4 symmetrically disposed on two sides of the main frame 1. The main frame 1 comprises an underframe 11, a vertical frame 12 and a flywheel 13, the flywheel 13 is installed on one side of the underframe 11, the vertical frame 12 is arranged on the top side of the flywheel 13, and the track 2 is arranged on the other side of the underframe 11. The two sliding and stepping connecting rod assemblies 4 comprise a first movable rod 41, a second movable rod 42 and a crank 43, the first movable rod 41 and the second movable rod 42 are arranged in a crossed manner and are fixedly connected at the crossed connection part, a pedal 411 is arranged at one end of the first movable rod 41, the other end of the first movable rod 41 is connected with one end of the crank 43, the other end of the crank 43 is fixedly arranged on the vertical frame 12, the crank 43 is fixedly arranged at one end of the vertical frame 12 and extends outwards to form a handle 431 for a hand to hold, one end of the second movable rod 42 is connected with the flywheel 13, the other end of the second movable rod 42 is connected with a rolling piece 421, the rolling piece 421 slides and moves along the track 2, in such a way, when a user uses the sliding and stepping type bicycle, the handle 431 swings forwards and backwards through the hand, and simultaneously steps on the pedal 411 to do the forward and backward movements, the first movable rod 41 drives the flywheel 13 to rotate, so as to be transmitted to the second movable rod 42, so as to drive the rolling member 421 to slide on the track 2, which is the action process of the elliptical machine for body building, and the user can exercise the hand, waist and leg at the same time. In the present embodiment, the direction of the elliptical trainer in the use state of being fixedly placed on the ground is taken as a description direction, that is, one side of the underframe 11 is a bottom side, and the side facing the stand 12 is a top side.

Referring to fig. 1 to 3, the rail 2 includes a first end 21 and a second end 22, the first end 21 of the rail 2 is pivotally connected to the chassis 11, and specifically, a hinge groove is formed on the chassis 11, and the rail 2 is connected to the hinge groove through a hinge shaft, so that the end of the rail 2 can rotate around the hinge shaft. The adjusting component 3 is a length-adjustable component, and is coupled between the second end 22 of the adjacent track 2 and the chassis 11 of the main frame 1, and the adjusting component, the second end 22 of the adjacent track 2 and the chassis 11 form a triangular structure so as to adjust the inclination angle of the track 2 relative to the chassis 11. In this embodiment, the mounting groove 111 is formed in the bottom frame 11, the adjusting component 3 is hinged to the mounting groove 11, the rotation range of the adjusting component 3 is limited to be 0-90 degrees, and the rotation of the adjusting component 3 is combined with the position relation between the adjusting track 2 and the adjusting component 3, so that the inclination angle range adjusted by the track 2 is larger, namely, the height difference range of the pedal is larger, and the adaptability is stronger. Of course, in other embodiments, the adjusting assembly 3 can be fixed on the chassis 11 at a certain inclination angle, which is not limited herein.

Wherein, the two tracks 2 are arranged in parallel, so that the rolling members 421 of the two sliding-pedal connecting rod assemblies 4 can move in a sliding manner, and the adjusting assembly 3 is located between the two tracks 2 and is respectively hinged with the two tracks 2, so that the adjusting assembly 3 is located at a position adjacent to the second end 22 of the track 2; in other embodiments, the track 2 may be a plate-shaped structure, and two sides of the plate-shaped structure are respectively provided with a guide rail for supporting the rolling members 421, so that the adjusting assembly 3 can only be disposed at the end of the second end 22 of the track 2, but in this embodiment, two tracks are symmetrically disposed in parallel, so that a triangular structure formed by the adjusting assembly, the track 2 and the chassis 11 is smaller, and a smaller acting force can be applied to drive the inclination angles of the two tracks 2 relative to the chassis 11 to be adjusted and fixed, so that the structure is more stable.

Referring to fig. 4 to 6, the adjusting assembly 3 is a length-adjustable assembly, which is specifically a telescopic bar assembly with adjustable length and fixed length, and has a fixed end 301 and a movable end 302, the fixed end 301 is pivotally connected to the bottom frame 11, and the movable end 302 is also pivotally connected to the track 2. Specifically, the length adjustable assembly comprises an outer sleeve 31, a sliding rod 32 and an adjustable positioning assembly 5 for limiting the position of the sliding rod 32 on the outer sleeve 31, wherein the outer end of the outer sleeve 31 is used as a fixed end 301, and the outer end of the sliding rod 32 is used as a movable end 302. The end of the inner end of the outer sleeve 31 is fixedly provided with a sliding support sleeve 303, the sliding rod 32 is slid in the sliding support sleeve 303, the sliding support sleeve 303 can be made of plastic or the like, or the sliding rod 32 is provided with a buffer part to reduce the friction between the sliding support sleeve 303 and the sliding rod 32, so that the sliding action of the sliding rod 32 is smoother.

With continued reference to fig. 6, the adjustable positioning assembly 5 includes: the plurality of shift position clamping holes 311 are arranged along the length direction of the outer sleeve 31, the clamping block 51 is arranged at the inner end of the sliding rod 32, and the operating assembly 52 drives the clamping block 51 to move, so that the clamping block 51 is clamped in one of the shift position clamping holes 311 for position limitation or the clamping block 51 is separated from the shift position clamping hole 311 for length adjustment through the operating assembly 52 driving the clamping block 51 to move. Therefore, when the user adjusts the inclination angle of the track 2, only the operation assembly 52 needs to be operated, which is convenient and fast, and is beneficial to the user to adjust. In order to stably clamp the fixture block 51 in one of the gear clamp holes 311, a plurality of gear clamp holes 311 are symmetrically disposed on two side walls of the outer sleeve 31, and the number of the gear clamp holes 311 can be set according to the size of the actual elliptical machine. The two latch blocks 51 are symmetrically arranged on two sides of the inner end of the sliding rod 32, and the operating assembly 52 drives the two latch blocks 51 to move, so that the two latch blocks 51 are simultaneously latched into one of the gear latching holes 311 arranged on two side walls of the outer sleeve 31 or the two latch blocks 51 are disengaged from the gear latching holes 311.

Referring to fig. 7 to 8, the two latch blocks 51 include a first protruding block 511, a second protruding block 512, a contact portion 513 and an elastic reset member 514, which are sequentially arranged from inside to outside, the first protruding block 511 is used for being engaged with the shift position latch hole 311, the second protruding block 512 includes a contact surface 5121 for being abutted against the inner end of the slide rod 32, the operating assembly 52 includes a pushing block 521, the pushing block 521 is provided with two inclined pushing surfaces 5211 respectively acting on the contact portions 513 of the two latch blocks 51, and the inclined pushing surfaces 5211 and the contact portions 513 of the two latch blocks 51 respectively slide along the inclined pushing surfaces 5211 by driving the pushing block 521 to move, so as to drive the first protruding blocks 511 of the two latch blocks 51 to move away from or close to realize being latched into the shift position latch hole 311 or being disengaged from the shift position latch hole 311; the elastic reset piece 514 applies force to the two latch blocks 51 to perform reverse reset. In this embodiment, two side walls of the inner end of the sliding rod 32 are provided with grooves 321, the bottom surface of the groove 321 is used for the abutting surface 5121 of the second protrusion 512 to abut against, and the two fixture blocks 51 are provided with hinge shafts 515 at positions of the other sides of the second protrusion 512, and the hinge shafts 515 and the sliding rod 32 are penetrated through by pin shafts to enable the fixture blocks 51 to rotate relatively. In order to ensure the limiting effect of the slide rod 32 on the second projection 512, the width of the groove 321 is consistent with the thickness of the second projection 512, and the thickness of the hinge shaft 515 is consistent with the thickness of the slide rod 32, so as to limit the latch 51. Thus, the latch 51 uses the hinge shaft 515 as a pivot to make the first protrusion 511 and the abutting portion 513 on both sides of the latch 51 move oppositely, and the pushing block 521 is driven to drive the abutting portion 513 to move, so as to drive the first protrusion 511 to move, so that the first protrusion 511 is clamped in the gear engaging hole 311 or disengaged from the gear engaging hole 311. Further, in the present embodiment, when the first protrusion 51 is engaged with the shift lock hole 311, the surface of the first protrusion 51 abutting against the shift lock hole 311 is parallel to the abutting surface 5121 of the second protrusion 512, so that the direction of the force of the pushing block 521 is perpendicular to the first protrusion 51, and the force of the pushing block 521 is maximally applied to the lock block 51.

In this embodiment, as shown in fig. 7, the elastic reset element 514 may adopt an elastic element such as a reset spring, a tension spring, etc., the two inclined pushing surfaces 5211 of the pushing block 521 are inclined outward from inside to outside, the first protruding block 511, the second protruding block 512 and the abutting portion 513 are gradually narrowed, by driving the pushing block 521 to move inward, the pushing block 521 abuts against the abutting portions 513 of the two latch blocks 51, the abutting portions 513 of the two latch blocks 51 are driven to be away from each other along the inclined pushing surfaces 5211, so that the first protruding blocks 511 of the two latch blocks 51 are disengaged from the gear position latch holes 311, and the elastic reset element 514 is contracted; through the drive promotion piece 521 outwards movement, promote piece 521 and the butt portion 513 butt of two fixture blocks 51, the first lug 511 of two fixture blocks 51 restores under the effect of elasticity reset key 514, keeps away from each other to the joint is in one of them gear card hole 311, so realize to promote the operation of piece 521 with the joint of control fixture block 51 and gear card hole 311 whether. Of course, in other embodiments, a structure may also be adopted in which the two inclined pushing surfaces 5211 of the pushing block 521 are inclined inward from inside to outside, and the inclination direction of the abutting portion 513 is opposite to that of the present embodiment, by driving the pushing block 521 to move inward, the pushing block 521 abuts against the abutting portions 513 of the two latch blocks 51, so as to drive the abutting portions 513 of the two latch blocks 51 to approach each other along the inclined pushing surfaces 5211, so as to make the first protrusions 511 of the two latch blocks 51 move away from each other and be clamped in one of the shift position latch holes 311, and by driving the pushing block 521 to move outward, the first protrusions 511 of the two latch blocks 51 approach each other under the action of the elastic resetting piece 514, so that the first protrusions 511 of the two latch blocks 51 are disengaged from the shift position latch holes 311, so that the action principle is opposite to that the action principle of the present embodiment, whether the latch blocks 51 are clamped with the shift position latch holes 311 can also be controlled by operating the pushing block 521, and are not intended to be limiting herein.

In the present embodiment, the first state (initial state) in which the push block 4221 does not abut against the abutment block 4213 of the buckle 421 and the buckle 421 is engaged with the slot 411 is described, and the second state in which the push block 4221 is driven to move forward and abuts against the abutment block 4213 of the buckle 421 and the buckle 421 is disengaged from the slot 411 is described as the injection mold. In other applications, the first state and the second state of the latch 421 and the slot 411 may be interchanged.

In order to facilitate the operation of the pushing block 521, referring to fig. 6, the operating assembly 52 further includes an operating end 522, the operating end 522 is connected to an elastic member 5221, the pushing block 521 is connected to the operating end 522 through a connecting rod 5222, the operating end 522 is exposed out of the outer end of the sliding rod 32, the pushing block 521 is driven to move by operating the operating end 522, and the elastic member 5221 applies a force to the connecting rod 5222 to perform reverse reset. For example, in the embodiment, the operating end 522 adopts a button, and the pushing block 521 is driven to move inward by pressing the button, so that the latch 51 is disengaged from the shift block hole 311, and the elastic member 5221 retracts; when the button is released, the elastic member 5221 is restored under the elastic restoring force, and drives the pushing block 521 to move outward, so that the latch 51 is latched in the gear latching hole 311. Alternatively, in other embodiments, the operating end 522 may be a pull ring, etc. and the pushing block 521 is driven to move outward by pulling the pull ring, so that the latch 51 is disengaged from the shift lock hole 311, and the elastic member 5221 retracts; when the pull ring is released, the elastic member 5221 returns under the action of the elastic restoring force and drives the pushing block 521 to move outward, so that the latch 51 is latched in the gear latching hole 311, which is not limited herein.

Furthermore, in order to facilitate the user's grasp, in order to better operate the operating component 52, the outer end of the sliding rod 32 is connected with an operating handle 523, a through hole for the operating end 522 to stretch out is opened on the operating handle 523, so, the operating handle 523 is grasped by the palm of the user, the operating end 522 can be conveniently operated by the thumb, the operating handle is grasped by the palm and the remaining four fingers, the operating end 522 can also be conveniently pulled or pushed, only one hand is needed to complete the track inclination angle, namely, the adjustment of the pedal height is very convenient.

The specific process of adjusting the track inclination angle of the elliptical exercise machine for body building is as follows:

when the inclination angle of the track 2 needs to be adjusted, a user holds the operating handle 523 with a palm, presses the button with a thumb, and drives the pushing block 521 to move inward, so that the abutting portions 513 of the two latch blocks 51 are away from each other along the inclined pushing surfaces 5211 of the pushing block 521, the first protruding blocks 511 of the two latch blocks 51 are driven to approach each other, and the elastic resetting piece 514 retracts, so that the first protruding blocks 511 of the latch blocks 51 are disengaged from the gear position latching holes 311; the slide bar 32 is pushed afterwards, the slide bar 32 slides relative to the outer sleeve 31, thereby the inclination angle of the track 2 is driven to change, according to the self condition of the user, the position relation between the slide bar 32 and the outer sleeve 31 is adjusted, the outer sleeve 31 is aligned with the gear clamping hole 311 at a proper position, the button is released, the pushing block 521 is driven to move outwards, the pushing block 521 is not abutted to the abutting block 513, under the action of the elastic restoring force of the elastic restoring piece 514, the first convex blocks 511 of the two clamping blocks 51 are clamped in the gear clamping hole 311, the adjustment of the inclination angle of the track 2 is realized, namely, the height of the pedal 411 is adjusted. The operation process is simple, the user can complete the operation only by one hand, and the height of the pedal can be adjusted by the user according to the self condition.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides an elliptical machine is used in body-building, includes main frame, track, adjusting part and symmetry and locates two smooth step on link assembly of main frame both sides, its characterized in that: the main frame at least comprises an underframe, the track comprises a first end and a second end, the first end of the track is pivotally connected with the underframe, and the sliding and stepping connecting rod assembly comprises a rolling piece which is supported on the track and slides along the track; the adjusting assembly is a length-adjustable assembly, the length-adjustable assembly is coupled and arranged between the second end of the adjacent track and the underframe of the main frame, and the length-adjustable assembly, the second end of the adjacent track and the underframe form a triangular structure so as to adjust and fix the inclination angle of the track relative to the underframe.

2. The elliptical exercise machine according to claim 1, wherein: the adjustable length subassembly specifically is adjustable length and fixed flexible loop bar subassembly, has stiff end and expansion end, the stiff end pivot is established and is connected the chassis, the expansion end is also pivoted and is established the connection and be in the track.

3. The elliptical exercise machine according to claim 2, wherein: the adjustable length assembly comprises an outer sleeve, a sliding rod and an adjustable positioning assembly, wherein the outer sleeve and the sliding rod are mutually sleeved in a sliding manner, the adjustable positioning assembly is used for limiting the position of the outer sleeve, the outer end of the outer sleeve is used as the fixed end, and the outer end of the sliding rod is used as the movable end.

4. The elliptical exercise machine for fitness of claim 3, wherein: the adjustable positioning assembly comprises: the sliding rod is provided with a plurality of gear clamping holes arranged along the length direction of the outer sleeve, a clamping block arranged at the inner end of the sliding rod and an operation assembly for driving the clamping block to move, the operation assembly drives the clamping block to move, so that the clamping block is clamped into one of the gear clamping holes to carry out position limitation or the clamping block is separated from the gear clamping holes to carry out length adjustment.

5. The elliptical exercise machine for fitness of claim 4, wherein: the two side walls of the outer sleeve are symmetrically provided with the plurality of gear clamping holes, the two clamping blocks are symmetrically arranged on the two sides of the inner end of the sliding rod, and the two clamping blocks are driven by the operation assembly to move so that the two clamping blocks are clamped into one of the gear clamping holes formed in the two side walls of the outer sleeve simultaneously or the two clamping blocks are separated from the gear clamping holes.

6. The elliptical exercise machine according to claim 5, wherein: the two fixture blocks comprise a first lug, a second lug and a butting part which are sequentially arranged from inside to outside, the first lug is used for being clamped and matched with the gear position clamping hole, the second lug comprises a butting surface which is used for being abutted against the inner end of the slide rod, the operation assembly comprises a pushing block, the pushing block is provided with two inclined pushing surfaces which respectively act with the butting parts of the two fixture blocks, the inclined pushing surfaces respectively and the butting parts of the two fixture blocks are obliquely and slidably moved along the inclined pushing surfaces by driving the pushing block to move, so that the first lugs of the two fixture blocks are driven to be far away or close, and the fixture blocks are clamped into the gear position clamping hole or separated from the gear position clamping hole; and the elastic resetting piece applies force to the two clamping blocks to reset reversely.

7. The elliptical exercise machine according to claim 6, wherein: the two side walls of the inner end of the sliding rod are provided with grooves, the bottom surfaces of the grooves are used for the abutting surfaces of the second convex blocks to abut against, the positions of the two clamping blocks on the other sides of the second convex blocks are provided with hinged shafts, and the hinged shafts and the sliding rod penetrate through hinge pins to enable the clamping blocks to rotate relatively.

8. The elliptical exercise machine of claim 7, wherein: the width of the groove is consistent with the thickness of the second bump, and the thickness of the hinge shaft is consistent with the thickness of the slide rod so as to limit the clamping block.

9. The elliptical exercise machine according to claim 6, wherein: the operating assembly further comprises an operating end, the operating end is connected with an elastic piece, the pushing block is connected with the operating end through a connecting rod, the operating end is exposed out of the outer end of the sliding rod, the operating end is operated to drive the pushing block to move, and the elastic piece applies force to the connecting rod to perform reverse reset.

10. The elliptical exercise machine for fitness of claim 9, wherein: the outer end of the sliding rod is further connected with an operating handle, and a through hole for the operating end to extend out is formed in the operating handle.

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