CN212055718U

CN212055718U - Lever driving device

Info

Publication number: CN212055718U
Application number: CN202020591178.9U
Authority: CN
Inventors: 陈勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-12-01
Anticipated expiration: 2030-04-20

Abstract

The utility model discloses a lever driving device, which comprises two sets of levers, two sets of transmission mechanisms, an axle center, a hollow rolling shaft, a rotary gear and a supporting frame; one end of the lever is connected with a transmission mechanism, the transmission mechanism is sleeved on the shaft center and can be rotatably connected with the shaft center, and the support frame is fixed in the middle of the shaft center and is rotatably connected with the hollow rolling shaft; the rotary gear is arranged at the hollow part of the support frame; the transmission mechanism is inserted into the inner cavity of the hollow rolling shaft. The utility model provides a lever drive arrangement with longer power arm reduces power loss, improves power effect, guarantees reasonable rotational speed.

Description

Lever driving device

Technical Field

The utility model relates to a mechanical drive field especially relates to a lever drive arrangement.

Background

The current common transmission modes mainly comprise belt transmission, chain transmission, gear transmission and worm transmission. The belt transmission center distance has the advantages of large change range, stable transmission, low noise, simple structure, low cost, low transmission precision, low efficiency and short service life. The chain transmission has large change range of center distance, can reliably work under severe conditions of high temperature, oil, acid and the like, but has impact, vibration and noise and has shorter service life. The gear transmission has the advantages of small overall size, high efficiency, constant transmission ratio, wide circumferential speed and power range, widest application, higher requirements on manufacturing and mounting precision, no buffering and noise. The worm has compact transmission structure, small overall dimension, constant transmission ratio, stable transmission, low transmission power, high requirement on manufacturing precision and high cutter cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a lever drive arrangement who has longer power arm utilizes the support frame structure to reduce power loss, improves power efficiency, guarantees reasonable rotational speed to drive arrangement's among the prior art transmission mode power arm shorter, and drive power loss is more, and power efficiency scheduling problem not high is provided.

The utility model aims at realizing through the following technical scheme: a lever driving device comprises two sets of levers, two sets of transmission mechanisms, an axis, a hollow rolling shaft, a rotary gear and a support frame; the lever comprises a power arm, two resistance arms and an inner tooth arc, the two resistance arms are connected with the power arm at a fulcrum, and the fulcrum and the axis are relatively static;

the far ends of the resistance arms are respectively connected with two ends of the inner tooth arcs, and the circle centers of the inner tooth arcs are superposed with the fulcrums; the transmission mechanism comprises a gear, a gear ring at the inner side end of the transmission mechanism, a pawl seat at the periphery of the transmission mechanism and a pawl arranged on the pawl seat; the gear is meshed with the inner gear arc; the meshing point of the gear and the inner tooth arc, the circle center of the gear and the fulcrum are positioned on the same straight line;

the transmission mechanism is sleeved on the shaft center and rotatably connected with the shaft center, and the support frame is fixed in the middle of the shaft center and rotatably connected with the hollow rolling shaft; the middle part of the support frame is provided with a hollow structure, and the rotary gear is arranged at the hollow part of the support frame; the gear ring ends of the two sets of transmission mechanisms are respectively arranged in a gap between the hollow rolling shaft and the axis from two sides; the transmission mechanism is rotatably connected with the hollow rolling shaft;

a ratchet ring is arranged on the inner cavity side of the hollow rolling shaft, and the ratchet ring and the pawl form an internal tooth type overrunning ratchet structure;

two sides of the rotary gear are respectively meshed with gear rings at the inner side ends of the two sets of transmission mechanisms;

furthermore, the ratchet mechanism also comprises a clutch fastener used for controlling the extension of the pawl, and the clutch fastener, the ratchet ring and the pawl form a clutch type ratchet structure.

The beneficial effects of the utility model reside in that: the utility model utilizes the supporting frame structure to transmit the main bearing force of the hollow rolling shaft to the axle center through the supporting frame, thereby ensuring that the resistance is extremely small when the transmission mechanism reversely rotates; and the utility model discloses utilize the lever to drive, gear drive, the power arm length, power loss is few, and power efficiency is high, and the precision is high, and can guarantee reasonable rotational speed.

Drawings

FIG. 1 is a schematic view of a lever actuator in its entirety;

FIG. 2 is a lever diagram;

FIG. 3 is a schematic structural view of an internal tooth type overrunning ratchet;

FIG. 4 is a schematic structural diagram of a core component of the driving device;

in the figure, a fulcrum O, a lever 1, a power arm 11, a resistance arm 12, an internal tooth arc 13, a transmission mechanism 2, a gear 21, a gear ring 22, a pawl seat 23, a pawl 24, an axis 3, a hollow rolling shaft 4, a ratchet ring 41, a rotary gear 5 and a support frame 6.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

The utility model provides a pair of lever drive device, including two sets of levers 1, two sets of drive mechanism 2, axle center 3, cavity roll over axle 4, slewing gear 5 and support frame 6. The ends of the gear rings 22 of the two sets of transmission mechanisms 2 are respectively arranged in a gap between the hollow rolling shaft 4 and the shaft center 3 from two sides; the two sets of transmission mechanisms 2 are respectively meshed with two sides of the rotary gear 5 through a gear ring 22 in the inner cavity of the hollow rolling shaft 4. Two sets of levers 1 are respectively arranged at the outer side end of the transmission mechanism 2.

As shown in fig. 1 and 2, the lever 1 includes a power arm 11, two resistance arms 12 and an inner toothed arc 13, the two resistance arms 12 are connected to the power arm 11 at a pivot point O, the power arm 11 and the resistance arms 12 rotate synchronously around the pivot point O, and the pivot point O is kept stationary relative to the shaft center 3. The far ends of the resistance arms 12 are respectively connected with the two ends of the inner tooth arcs 13, and the circle centers of the inner tooth arcs 13 are superposed with the supporting point O; the inner toothed segment 13 meshes with a gear wheel 21 in the gear mechanism 2.

As shown in fig. 3 and 4, the transmission mechanism 2 comprises a gear 21, a toothed ring 22 at the inner end of the transmission mechanism 2, a pawl seat 23 at the periphery of the transmission mechanism 2, and a plurality of pawls 24 mounted on the pawl seat 23; the meshing point of the gear 21 and the inner gear arc 13, the circle center of the gear 21 and the fulcrum O are positioned on the same straight line.

The transmission mechanism 2 is sleeved on the shaft center 3 and rotatably connected with the shaft center 3, and the support frame 6 is fixed in the middle of the shaft center 3 and rotatably connected with the hollow rolling shaft 4 through a bearing; the middle part of the support frame 6 is provided with a hollow structure, and the rotary gear 5 is arranged at the hollow part of the support frame 6; the main bearing force of the hollow rolling shaft 4 is transmitted to the shaft center 3 by the support frame 6, so that the resistance is extremely small when the transmission mechanism 2 rotates reversely.

The inner side of the hollow rolling shaft 4 is provided with a ratchet ring 41, and the ratchet ring 41 and the plurality of pawls 24 form an internal tooth type overrunning ratchet structure.

The central shaft of the rotary gear 5 is vertical to the axis 3, and two sides of the rotary gear 5 are respectively meshed with the gear rings 22 at the inner side ends of the two sets of transmission mechanisms 2;

the slewing gear 5 of the utility model is the common general knowledge in the field, and the synchronous reverse gyration of input and output is realized to the transmission that utilizes two slewing gear 5.

In a particular embodiment, fulcrum O and hub 3 are typically fixed by a bracket such that fulcrum O remains stationary relative to hub 3.

Applying a downward acting force to the power arm 11 of the left lever 1 to make the left inner tooth arc 13 move around the fulcrum O, so as to drive the gear 21 engaged with the fulcrum O to rotate clockwise; the gear 21 on the left side is coaxially connected with the toothed ring 22 and the pawl seat 23, so that the toothed ring 22 and the pawl seat 23 on the left side are driven to rotate clockwise; at this time, pawls 24 on left pawl seat 23 are held tightly with left ratchet ring 41, and hollow tumble shaft 4 is driven to rotate clockwise. Meanwhile, the gear ring 22 on the left side is meshed with the left side of the rotary gear 5, the rotary gear 5 rotates along with the rotary gear, and the right side of the rotary gear 5 is meshed with the gear ring 22 of the transmission mechanism 2 on the right side, so that the gear ring 22 on the right side synchronously rotates in the reverse direction, the pawl seat 23 on the right side, the pawl 24 and the gear 21 are driven to synchronously rotate anticlockwise, the gear 21 drives the resistance arm 12 to move downwards through the inner tooth arc 13 on the right side, and the power arm 11 moves upwards; while the counterclockwise rotating pawls 24 are in an overrunning-like state with the right ratchet ring 41. Therefore, the left and right ratchet rings 41 alternately output driving force to drive the hollow tumble shaft 4 to roll in one direction.

It will be following that the utility model discloses a lever drive device is used for the rear wheel drive of bicycle, specifically as follows:

the hollow rolling shaft 4 is used as a rear wheel hub, and an axle center 3 and a lever fulcrum which are positioned in the rear wheel hub are fixed on the frame. A pedal is arranged at the tail end of the power arm. When the pedal on one side is stepped down, the bicycle moves forwards, and the pedal on the other side synchronously rises for the next stepping. The bicycle is driven alternately and moves forward stably.

The total length of the lever is 60cm, wherein the power arm 11 is 45cm, the two resistance arms 12 are 15cm, and the length of the inner tooth arc 13 is calculated to be 1/3 which is about the maximum moving distance of the pedal according to a similar triangle. The maximum distance traveled by the pedals (distance between the highest and lowest points) is typically around 40cm on a conventional bicycle basis, so the length of the inner arc 13 is about 13.33 cm.

The diameter of the gear is 4cm, the circumference is 12.56cm, and the first gear rotates more than one circle when being treaded once, so that the rear wheel also synchronously rotates more than one circle to reach the speed of the universal chain type bicycle. In addition, as the lever type driving and supporting frame is adopted to bear the main load force, the driving force is saved, the energy loss is reduced, and the force effect is improved.

As is well known in the art, the driving device may further include a clutch member, such as a spring, for controlling the extension and retraction of the pawls 24, and the clutch member forms a clutch type ratchet with the ratchet ring 41 and the plurality of pawls 24. When the bicycle needs to back, the pawl 24 is controlled by the clutch fastener to be separated from the ratchet ring 41, and the bicycle is in a non-holding state, so that the bicycle can freely back.

The above-mentioned embodiments are provided for explaining the present invention, not for limiting the present invention, and any modifications and changes made to the present invention are within the spirit of the present invention and the scope of the claims and fall within the scope of the present invention.

Claims

1. A lever driving device is characterized by comprising two sets of levers (1), two sets of transmission mechanisms (2), an axle center (3), a hollow rolling shaft (4), a rotary gear (5) and a support frame (6); the lever (1) comprises a power arm (11), two resistance arms (12) and an inner tooth arc (13), wherein the two resistance arms (12) are connected with the power arm (11) at a fulcrum, and the fulcrum and the axis (3) are relatively static;

the far ends of the resistance arms (12) are respectively connected with two ends of an inner tooth arc (13), and the circle center of the inner tooth arc (13) is superposed with the fulcrum; the transmission mechanism (2) comprises a gear (21), a toothed ring (22) at the inner end of the transmission mechanism (2), a pawl seat (23) at the periphery of the transmission mechanism (2) and a pawl (24) arranged on the pawl seat; the gear (21) is meshed with the inner gear arc (13); the meshing point of the gear (21) and the inner gear arc (13), the circle center of the gear (21) and the fulcrum are positioned on the same straight line;

the transmission mechanism (2) is sleeved on the shaft center (3) and rotatably connected with the shaft center (3), and the support frame (6) is fixed in the middle of the shaft center (3) and rotatably connected with the hollow rolling shaft (4); the middle part of the support frame (6) is provided with a hollow structure, and the rotary gear (5) is arranged at the hollow part of the support frame (6); the gear ring ends of the two sets of transmission mechanisms (2) are respectively arranged in a gap between the hollow rolling shaft (4) and the shaft center (3) from two sides; the transmission mechanism (2) is rotatably connected with the hollow rolling shaft (4);

a ratchet ring (41) is arranged on the inner cavity side of the hollow rolling shaft (4), and the ratchet ring (41) and the pawl (24) form an internal tooth type overrunning ratchet structure;

two sides of the rotary gear (5) are respectively meshed with gear rings (22) at the inner side ends of the two sets of transmission mechanisms (2).

2. The lever driving device according to claim 1, further comprising a clutch fastener for controlling the extension and retraction of the pawl (24), and the clutch fastener, the ratchet ring (41) and the pawl (24) form a clutch type ratchet.