阅读说明：本技术 一种可变径无级变速器 (Variable diameter continuously variable transmission ) 是由 刘海洋 佟鑫 仇义 张晨 陈智 郭芳 戴念祖 周云鹤 豪宝尔 萨仁娜 汪文静 于 2019-12-12 设计创作，主要内容包括：本发明公开了一种可变径无级变速器,结构相同的所述第一机架和第二机架相互平行的固定连接在壳体上；所述从动模块包括与第一机架转动连接的输出锥轮,输出锥轮固定连接有同心的输出锥型齿轮；主动模块包括固定连接有同心的输出锥型齿轮的输入锥轮,输入锥轮与所述第二机架转动连接；输入锥轮和输出锥轮锥面朝向相反,外周均沿母线方向设有若干滑槽；滑槽内设有带轮滑键；输入锥轮上的若干所述带轮滑键形虚拟的主动带轮；输出锥轮上的若干所述带轮滑键形虚拟的从动带轮；主动带轮与从动带轮通过CVT钢带连接；输出锥轮与输入锥轮锥面朝向相反；调节模块驱动所述带轮滑键沿所述滑槽自由滑动。(The invention discloses a variable-diameter continuously variable transmission, wherein a first rack and a second rack which have the same structure are fixedly connected to a shell in parallel; the driven module comprises an output cone pulley which is rotationally connected with the first frame, and the output cone pulley is fixedly connected with a concentric output cone-shaped gear; the driving module comprises an input cone pulley fixedly connected with a concentric output cone-shaped gear, and the input cone pulley is rotationally connected with the second rack; the conical surfaces of the input conical pulley and the output conical pulley face opposite directions, and a plurality of sliding grooves are formed in the periphery of the input conical pulley and the periphery of the output conical pulley along the direction of a bus; a pulley sliding key is arranged in the sliding chute; inputting a plurality of belt wheel sliding key-shaped virtual driving belt wheels on a cone pulley; a plurality of pulley sliding key-shaped virtual driven pulleys on the output cone pulley; the driving belt wheel is connected with the driven belt wheel through a CVT steel belt; the conical surfaces of the output conical pulley and the input conical pulley face opposite directions; the adjusting module drives the pulley sliding key to freely slide along the sliding groove.)

1. A variable diameter continuously variable transmission comprising a housing characterized in that: a first rack (4), a second rack (20), a driving module, a driven module and an adjusting module are arranged in the shell; the first rack (4) and the second rack (20) which have the same structure are parallel to each other and are fixedly connected to the shell; the driven module comprises an output cone pulley (12) which is rotationally connected with the first rack (4), and the output cone pulley (12) is fixedly connected with a concentric output cone-shaped gear (8); the driving module comprises an input cone pulley (17) which is rotationally connected with the second rack (20), and the input cone pulley (17) is fixedly connected with a concentric input cone-shaped gear (7); the conical surfaces of the input conical pulley (17) and the output conical pulley (12) face opposite directions, and a plurality of sliding grooves (15) are formed in the periphery of the input conical pulley and the output conical pulley along the direction of a bus; a pulley sliding key (16) is arranged in the sliding groove (15); a plurality of pulley sliding keys (19) on the input cone pulley (17) form virtual driving pulleys; a plurality of pulley sliding keys (16) on the output cone pulley (12) form virtual driven pulleys; the driving belt wheel is connected with the driven belt wheel through a CVT steel belt; the adjusting module drives the pulley sliding key (16) to only slide along the sliding groove (15).

2. The variable-diameter continuously variable transmission according to claim 1, wherein the adjustment module comprises a first control long draw bar (3), a second control long draw bar (19), a first polygonal draw bar (11), a second polygonal draw bar (18), a connecting member (2), and a driving member; the first control long pull rod (3) sequentially penetrates through the first rack (4), the output cone pulley (12) and the second rack (20) and then is in bearing connection with the connecting piece (1); the second control long pull rod (19) sequentially penetrates through the first rack (4), and is connected with the bearing of the connecting piece (1) after being input into the cone pulley (17) and the second rack (20); the first polygonal pull rod (11) is connected with the first control long pull rod (3) through a bearing; the first polygonal pull rod (11) is hinged with the first short pull rod (10); the first short pull rod (10) is hinged with a pulley sliding key on the output cone pulley (12); the second polygonal pull rod (18) is connected with the second control long pull rod (19) through a bearing; the second polygonal pull rod (18) is hinged with a second short pull rod (21); the second short pull rod (21) is hinged with a pulley sliding key (16) on the input cone pulley (17); the first polygonal pull rod (11) is centrosymmetric with the second polygonal pull rod (18); the driving part can drive the connecting piece (1) to move back and forth.

3. The variable diameter continuously variable transmission of claim 2, wherein: the driving component comprises a stepping motor and a pushing rack (1); the pushing rack (1) is fixedly connected with the connecting piece (2); the stepping motor is meshed with the propelling rack (1) through a gear.

4. A variable diameter continuously variable transmission according to any one of claims 1 to 3, wherein: the device also comprises a tubular first rotating shaft bracket (5) and a tubular second rotating shaft bracket (6); a first through hole is formed in the middle of the output cone pulley (12), and the large conical surface faces the first rack (4); a first deep groove ball bearing (13) and a second deep groove ball bearing (14) are respectively arranged at two ends of the first through hole; one end of the first rotary shaft support (5) is fixedly connected with the first machine frame, the other end of the first rotary shaft support is fixedly connected with the first deep groove ball bearing (13) and the second deep groove ball bearing (14) respectively, and the first control long pull rod (3) penetrates through the first rotary shaft support (5); a second through hole is formed in the middle of the input cone pulley (17), and the large conical surface faces the second rack (20); a first deep groove ball bearing (13) and a second deep groove ball bearing (14) are respectively arranged at two ends of the second through hole; one end of the first rotary shaft support is fixedly connected with the first machine frame, the other end of the first rotary shaft support is fixedly connected with the first deep groove ball bearing (13) and the second deep groove ball bearing (14) respectively, and the first control long pull rod (3) penetrates through the first rotary shaft support (5).

5. The variable diameter continuously variable transmission of claim 4, wherein: the first polygonal pull rod (11) is located between the output cone pulley (12) and the second machine frame (20), and the second polygonal pull rod (11) is located between the input cone pulley (17) and the first machine frame (4).

6. The variable diameter continuously variable transmission of claim 5, wherein: the output bevel gear (8) is fixedly connected with the large conical surface end of the output bevel gear (12); the input bevel gear (5) is fixedly connected with the large bevel end of the input bevel gear (17).

Technical Field

The invention relates to the field of mechanical transmissions, in particular to a variable-diameter continuously variable transmission.

Background

The automobile transmission has the function of expanding the variation range of the torque and the rotating speed of a driving wheel by changing the transmission ratio so as to adapt to the frequently-changed running condition and ensure that an engine works under the favorable working condition; under the condition that the rotation direction of the engine is unchanged, the automobile can run backwards; with neutral, power transfer is interrupted, enabling the engine to start, idle, and facilitating transmission gear shifting or power take off. The prior art is mature and the speed changer applied to the automobile is available; manual Transmission (MT), AMT transmission, Automatic Transmission (AT), CVT continuously variable transmission, dual clutch transmission. The CVT can intelligently match the optimal gear and the speed ratio is continuous when the gears are shifted, so that the CVT has no pause and frustration feeling when being driven, and the comfort and the fuel economy are improved. However, the steel belt, which is a main component, is frequently pressed by the platens on both sides, so that the steel belt is easily worn and has low mechanical efficiency. At present, the bearing force of a steel belt is limited, so that the CVT only needs to be applied to a small-displacement automobile.

A chinese patent document named a stepless speed change device discloses a stepless speed change structure, which includes an input cone pulley and an output cone pulley with parallel axes and opposite conical surface orientations, and a transmission chain connecting them, wherein the peripheries of the input cone pulley and the output cone pulley are provided with chutes along the bus direction, the transmission chain is installed on a variable diameter slide block, and the variable diameter slide block moves along the chutes under the coordination of a ball discharging pump and steel balls installed in the chutes to realize speed change. Compared with the traditional CVT, the stepless speed change device has the advantages of more complex structure, higher processing precision requirement and higher cost.

Disclosure of Invention

The invention provides a method for making up the defects of the prior art.

The invention is realized by the following technical scheme:

a variable-diameter continuously variable transmission comprises a shell, wherein a first rack, a second rack, a driving module, a driven module and an adjusting module are arranged in the shell; the first rack and the second rack which have the same structure are parallel to each other and are fixedly connected to the shell; the driven module comprises an output cone pulley which is rotationally connected with the first frame, and the output cone pulley is fixedly connected with a concentric output cone-shaped gear; the driving module comprises an input cone pulley which is rotationally connected with the second rack, and the input cone pulley is fixedly connected with a concentric input cone-shaped gear; the conical surfaces of the input conical pulley and the output conical pulley face opposite directions, and a plurality of sliding grooves are formed in the periphery of the input conical pulley and the periphery of the output conical pulley along the direction of a bus; a pulley sliding key is arranged in the sliding groove; a plurality of belt wheel sliding key-shaped virtual driving belt wheels on the input cone pulley; a plurality of pulley sliding key-shaped virtual driven pulleys on the output cone pulley; the driving belt wheel is connected with the driven belt wheel through a CVT steel belt; the adjusting module drives the pulley sliding key to freely slide along the sliding groove.

The adjusting module comprises a first control long pull rod, a second control long pull rod, a first multi-edge pull rod, a second multi-edge pull rod, a connecting piece and a driving part; the first control long pull rod sequentially penetrates through the first rack, the output cone pulley and the second rack and then is connected with the connecting piece bearing; the second control long pull rod sequentially penetrates through the first rack, is input into the cone pulley and the second rack and then is connected with the connecting piece bearing; the first polygonal pull rod is connected with the first control long pull rod through a bearing; the first polygonal pull rod is hinged with the first short pull rod; the first short pull rod is hinged with a pulley sliding key on the output cone pulley; the second polygonal pull rod is connected with the second control long pull rod through a bearing; the second short pull rod of the second polygonal pull rod is hinged; the second short pull rod is hinged with a pulley sliding key on the input cone pulley; the first polygonal pull rod and the second polygonal pull rod are centrosymmetric; the driving component can drive the connecting piece to move back and forth.

The driving part comprises a stepping motor and a pushing rack; the pushing rack is fixedly connected with the connecting piece; the stepping motor is meshed with the propelling rack through a gear.

The device also comprises a first tubular rotating shaft bracket and a second tubular rotating shaft bracket; a first through hole is formed in the middle of the output cone pulley, and the large cone surface faces the first rack; a first deep groove ball bearing and a second deep groove ball bearing are respectively arranged at two ends of the first through hole; one end of the first rotary shaft support is fixedly connected with the first machine frame, the other end of the first rotary shaft support is fixedly connected with the first deep groove ball bearing and the second deep groove ball bearing respectively, and the first control long pull rod penetrates through the first rotary shaft support; a second through hole is formed in the middle of the input cone pulley, and the large cone surface faces the second rack; a first deep groove ball bearing and a second deep groove ball bearing are respectively arranged at the two ends of the second through hole; one end of the first rotary shaft support is fixedly connected with the first machine frame, the other end of the first rotary shaft support is fixedly connected with the first deep groove ball bearing and the second deep groove ball bearing respectively, and the first control long pull rod penetrates through the first rotary shaft support.

The first multi-edge pull rod is positioned between the output cone pulley and the second machine frame, and the second multi-edge pull rod is positioned between the input cone pulley and the first machine frame.

The output bevel gear is fixedly connected with the large conical surface end of the output bevel gear; the input bevel gear is fixedly connected with the large bevel end of the input bevel gear.

The invention has simple and reliable structure, easy maintenance, low cost and no limit of fixed gears, and compared with the traditional CVT transmission, the steel belt can not receive extrusion abrasion in the using process, so that the invention has higher transmission efficiency and longer service life; compared with the traditional hydraulic regulation, the hydraulic regulation adopts the stepping motor for regulation, not only can save space, but also has lower requirements on the processing technology, and can effectively reduce cost.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a front view of the present invention.

Fig. 3 is a partial mechanism diagram at a.

Fig. 4 is a partial mechanism diagram at B.

1-a propulsion rack, 2-a connecting piece, 3-a first control long pull rod, 4-a first frame, 5-a first rotating shaft support, 6-a second rotating shaft support, 7-an input bevel gear, 8-an output bevel gear, 9-a CVT steel belt, 10-a first short pull rod, 11-a first multi-edge pull rod, 12-an output bevel wheel, 13-a first deep groove ball bearing, 14-a second deep groove ball bearing, 15-a chute, 16-a belt pulley sliding key, 17-an input bevel wheel, 18-a second multi-edge pull rod, 19-a second control long pull rod, 20-a second frame and 21-a second short pull rod.

Detailed Description

The following are only embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention are intended to be covered by the scope of the present invention.

In the embodiment, words such as "left", "right", "inside", "outside", etc. describing the directional relationship are only for convenience of description of the embodiment, and are not to be construed as limiting the present invention. The terms "first," "second," and the like, are used solely to distinguish one from another in the description, and are not to be construed as indicating or implying relative importance, nor should they be construed as distinguishing between structures. The fixed connection means includes, but is not limited to, welding, screwing, etc. known in the art.

Fig. 1 to 4 show an embodiment of the present invention. This embodiment provides a variable diameter continuously variable transmission. The variable-diameter continuously variable transmission is integrally in a central symmetry shape and comprises a shell (not shown), wherein a first rack 4, a second rack 20, a driving module, a driven module and an adjusting module are arranged in the shell.

The first machine frame 4 and the second machine frame 20 are in an oblong shape and are fixedly connected with the shell, the first machine frame 4 and the second machine frame 20 are parallel to each other and have the same structure, two ends of the first machine frame are provided with unthreaded holes, and grease grooves are arranged in the unthreaded holes.

The driven module comprises a cylindrical first rotating shaft bracket 5 fixedly connected with one unthreaded hole of the first frame 4, namely one end of the first rotating shaft bracket 5 is fixedly connected with one unthreaded hole of the first frame 4 and extends between the first frame 4 and the second frame 20. The other end of the first rotating shaft bracket 5 is rotatably connected with an output cone pulley 12.

The middle of the output cone pulley 12 is provided with a first through hole, and the two ends of the first through hole are respectively provided with a first deep groove ball bearing 13 and a second deep groove ball bearing 14. The large conical surface of the output conical wheel 12 faces the first frame 4 and is fixedly connected with the output conical gear 8. The first rotary shaft bracket 5 passes through the output bevel gear 8 and enters the first through hole and is tightly connected with the first deep groove ball bearing 13 and the second deep groove ball bearing 14 respectively. The first spindle support 5 supports the output cone 12 through the first and second deep groove ball bearings 13 and 14 so that the output cone 12 can freely rotate around the first spindle support 5.

The active module comprises a cylindrical second rotating shaft support 6 fixedly connected with an unthreaded hole of the second rack 20, namely, one end of the second rotating shaft support 6 is fixedly connected with an unthreaded hole of the second rack 20 and extends between the first rack 4 and the second rack 20. The other end of the first rotary shaft support 5 is rotatably connected with an input cone pulley 17.

The middle of the input cone pulley 17 is provided with a second through hole, and the two ends of the second through hole are respectively provided with a first deep groove ball bearing 13 and a second deep groove ball bearing 14. The big conical surface of the input conical wheel 17 faces the second frame 20 and is fixedly connected with the input conical gear 7. The second rotating shaft bracket 6 passes through the input bevel gear 7, enters the second through hole and is respectively and tightly connected with the first deep groove ball bearing 13 and the second deep groove ball bearing 14. The second spindle support 6 supports the input cone pulley 17 through the first deep groove ball bearing 13 and the second deep groove ball bearing 14, so that the input cone pulley 17 can freely rotate around the second spindle support 6.

The conical surfaces of the output conical pulley 12 and the input conical pulley 17 are opposite in direction, namely the large conical surface of the output conical pulley 12 faces the first frame 4 and is fixedly connected with the output conical gear 8. The peripheries of the output cone pulley 12 and the input cone pulley 17 are provided with a plurality of sliding grooves 15 along the bus direction. A pulley spline 16 is mounted in the chute 15, and the pulley spline 16 includes a lower slider and an upper U-shaped groove, the slider being engaged in the chute 15 so that the pulley spline 16 can slide freely along the chute 15, and the U-shaped groove being adapted to receive the CVT steel belt 9. The pulley slider 16 is driven by the adjustment module to slide back and forth along the slide slot 15. A plurality of pulley splines 16 on the output cone 12 form a virtual driven pulley. A plurality of pulley sliding keys 16 on the input cone pulley 17 form a virtual driving pulley. The driving pulley and the driven pulley are connected through a CVT steel belt 9.

The adjusting module comprises a first control long pull rod 3, a second control long pull rod 19, a first polygonal pull rod 11, a second polygonal pull rod 18, a connecting piece 2 and a driving part; the drive means comprise a stepper motor and a drive rack 1.

The first control long pull rod 3 passes through the first frame 4, the first rotating shaft bracket 5 and the second frame 20 in sequence and is in rotating connection with the connecting piece 2 through an angular contact bearing. The part of the first control long pull rod 3, which is positioned on the output cone pulley 12 and the second frame 20, is rotationally connected with the first polygonal pull rod 11 through an angular contact bearing. The first polygonal pull rod 11 is composed of a plurality of first connecting rods with equal length which are radially distributed from the center of a circle to the periphery to form a star-wheel structure. The first connecting rod on the first multi-edge pull rod 11 is hinged with a first short pull rod 10, and the first short pull rod 10 is hinged with a pulley sliding key 16 on the output cone pulley 12. The first control long pull rod 3 is not in direct contact with the first frame 4 and the second frame 20, namely, the first control long pull rod 3 penetrates through the unthreaded holes of the first frame 4 and the second frame 20 and is lubricated by lubricating oil in the grease grooves in the unthreaded holes; the first control long pull rod 3 is in contact with the inner surface of the first rotating shaft bracket 5 and lubricated by grease.

The second control long pull rod 19 passes through the first frame 4, the second rotating shaft bracket 6 and the second frame 20 in sequence and is rotationally connected with the connecting piece 2 through an angular contact bearing. The second control long pull rod 19 is positioned between the second-input cone wheel 17 and the first machine frame 4 and is rotationally connected with the second polygonal pull rod 18 through an angular contact bearing. The second polygonal pull rod 18 is composed of a plurality of second connecting rods with equal length which are radially distributed from the center of the circle to the periphery, and a star-shaped wheel-shaped structure is formed. The second connecting rod on the second polygonal pull rod 18 is hinged with a second short pull rod 21, and the second short pull rod 21 is hinged with the pulley sliding key 16 on the input cone pulley 17. The second control long pull rod 19 is not in direct contact with the first frame 4 and the second frame 20, that is, the second control long pull rod 19 passes through the unthreaded holes of the first frame 4 and the second frame 20 and is lubricated by the lubricating oil in the grease groove in the unthreaded hole. The second control long pull rod 19 is contacted with the inner surface of the second rotating shaft bracket 6 and lubricated by grease

The pushing rack 1 is fixedly connected with the connecting piece 2 and extends along the direction from the second frame 20 to the first frame 4, and the part motor is meshed with the pushing rack 1 through a gear. The stroke of the pushing rack 1 is less than the length of the slide slot 15.

When the variable-diameter continuously variable transmission works, power is input into the input bevel gear 7 through the bevel gear to drive the input bevel wheel 17, and the input bevel wheel 17 drives the second polygonal pull rod 18, the second control long pull rod 19 and the driven module to rotate through driving the belt pulley sliding key 16, the second short pull rod 21 and the CVT steel belt 9. The output bevel gear 8 of the driven module rotates to output power. When the speed is changed, the stepping motor regulates and controls the forward and backward movement of the first control length 3 and the second control length 19 through the pushing rack 1 and the connecting piece 2, and further drives the first polygonal pull rod 11 and the second polygonal pull rod 18 to move forward and backward. The first polygonal pull rod 11 and the second polygonal pull rod 18 respectively drive the pulley sliding key 16 to move back and forth in the sliding chute 15 through the first short pull rod 10 and the second short pull rod 21. The pulley sliding key 16 is positioned at different positions and drives the steel belt to move forward and backward, so that the diameters of the driving pulley and the driven pulley are changed correspondingly to complete the speed change.

It should be noted that the driving component of the present invention can also be realized by using push-pull structures such as hydraulic push rods, lead screws, etc.; the adjusting module can be replaced by a transmission mechanism such as a lead screw, a pull cable or a push-pull rod.