WO2013071705A1

WO2013071705A1 - Hub power generator for bicycle

Info

Publication number: WO2013071705A1
Application number: PCT/CN2012/070221
Authority: WO
Inventors: 古进全; 徐浙
Original assignee: 宁波威士顿车业有限公司
Priority date: 2011-11-16
Filing date: 2012-01-11
Publication date: 2013-05-23
Also published as: CN202334208U

Abstract

Disclosed in the present invention is a hub power generator for a bicycle, which comprises an inner stator assembly (13) and an outer rotor assembly, wherein the inner stator assembly (13) comprises an annular coil (26), multiple groups of first stator magnet yokes (21) and multiple groups of second stator magnet yokes are respectively arranged at two axial ends of the annular coil along the circumference in a staggered manner,and the openings of the first stator magnet yokes (21) and the second stator magnet yokes are opposite; each first stator magnet yoke (21) and each second stator magnet yoke consist of multiple layers of silicon steel laminations; the inner edge of each first stator magnet yoke (21) and the inner edge of each second stator magnet yoke are arranged on the inner side of a framework in a staggered manner; axial ends of the inner edge of each first stator magnet yoke (21) and the inner edge of each second stator magnet yoke are connected by a cylindrical core yoke; connection edges of the laminations are stepped at the inner edge ends; and the outer edges of the laminations are stepped at the opening ends. The first stator magnet yokes (21)and the second stator magnet yokes are improved so that vortex and leakage flux are reduced during power generation, thus the power generation efficiency is improved, and the sealing performance and the waterproof performance are improved through the arrangement of seal rings.

Description

Bicycle hub generator

(1) Technical field

The utility model relates to a generator, in particular to a generator applied to a bicycle.

(2) Background technology

Existing bicycle power generating hubs generally include: an inner stator assembly secured to the hub axle and an outer hub shell assembly rotatable relative to the hub center shaft. The inner stator assembly is provided with a hub central shaft, two stator yokes, a cylindrical core yoke connecting the two stator yokes, a skeleton and a winding coil; the outer rotor assembly is provided with a hub shell, an end cover, and a surface of the inner ring of the casing is provided with a permanent magnet. In the permanent magnet, the N pole and the S pole are evenly spaced, and correspond to the stator yoke respectively, and the plurality of spokes of the front wheel are fixed on the flanges on both sides of the hub shell. When the current wheel rotates, an alternating magnetic flux is generated in the cylindrical core yoke inside the coil, thereby inducing a current in the coil, and one end of the coil leads out of the hub shell, and the power output generated when the hub shell is rotated through an insulating socket.

For this kind of power generating hub, based on the shape and cost considerations, the stator yoke is basically manufactured by an electrician pure iron plate with high workability, which will reduce the power generation efficiency due to eddy current generated during power generation. In response to this problem, in the prior art, a yoke composed of a plurality of plate-like laminated sheets is used instead of an yoke made of an electric iron plate, which effectively reduces eddy currents during power generation and improves power generation efficiency. However, there is still a deficiency, and the laminated yoke cannot effectively utilize the space inside the coil, and the leakage magnetic flux is large, thereby reducing the power generation efficiency. In addition, the existing sealing structure at the hub of the power generating hub and the end cap bearing tends to cause dust or muddy water to enter the bearing, affecting the performance and life of the power generating hub.

(3) Invention content

In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a bicycle hub generator which has a simple structure yoke to reduce eddy current and leakage flux during power generation, and to improve power generation efficiency and sealing effect.

The technical solution of the utility model to solve the technical problems thereof is:

A bicycle hub generator comprising a hub central axle fixed to a bicycle, said hub An inner stator assembly and an outer rotor assembly rotatable relative to a central axis of the hub are fixed on the central shaft, the outer rotor assembly includes a hub shell, and both ends of the hub shell are fixed to the hub shaft by bearings a permanent magnet is disposed on an inner surface of the hub shell, the inner stator assembly includes a tubular frame fixed on a shaft of the hub, the bobbin is wound with a loop coil, and the two ends of the loop coil are respectively axially a plurality of sets of first stator yokes and a plurality of sets of second stator yokes are disposed on the circumference, wherein: the first stator yoke and the second stator yoke are composed of a plurality of layers of silicon steel laminations, The first stator yoke and the second stator yoke are identical in shape and have an open frame shape, and the first stator yoke and the second stator yoke opening are opposite and staggered, and the first stator yoke is And the second stator yoke includes an inner side, an outer side and a connecting side connecting the inner side and the outer side, wherein the inner side of the first stator yoke and the inner side of the second stator yoke are staggered on the inner side of the skeleton And the inner side of the first stator yoke and the second stator The axial end of the inner side of the yoke is connected by a cylindrical core yoke, the axial end surface of the inner side of the first stator yoke contacts the side connecting the cylindrical core yoke, and the second stator magnetic An axial end surface of the inner side of the yoke contacts the other side of the cylindrical core yoke, and outer edges of the first stator yoke and the second stator yoke are alternately disposed outside the toroidal coil, the lamination The connecting edge is stepped at the inner end, and the outer edge of the lamination is stepped at the open end.

Preferably, the first stator yoke and the second stator yoke are each composed of 8 sheets of silicon steel lamination, which are, in order, a first piece, a second piece, a third piece, a fourth piece, a fifth piece, a sixth piece, The seventh and eighth pieces, the second to the seventh pieces have the same length on the outer side, and the lengths of the first piece and the eighth piece in the radial direction are smaller than the length of the second to the seventh piece on the outer side, the first The length of the three to six pieces on the connecting side is the same, the length of the second piece and the seventh piece on the connecting side is smaller than the length of the third to six pieces on the connecting side, and the first piece and the eighth piece are on the connecting side. The length is less than the length of the second and seventh sheets on the joined side.

Preferably, the cylindrical core yoke is in the shape of a notched ring, and the cylindrical core yoke is disposed inside the skeleton. Preferably, the outer side of the bearing of the outer rotor assembly is respectively provided with a sealing ring, and the outer end faces of the two ends of the hub shell are respectively provided with a sealing ring groove, and the sealing ring is disposed in the groove of the sealing ring , the radially outer lip portion of the sealing ring, the sealing ring groove interference fit, the diameter of the sealing ring The inward lip contacts the hub center shaft.

Preferably, both sides of the skeleton are provided with a first skeleton flange and a second skeleton flange, and the first skeleton flange and the second skeleton flange are respectively arranged in the circumferential direction with a plurality of sets of first skeleton grooves a slot and a plurality of sets of second frame grooves, wherein the first frame groove and the second frame groove are staggered and circumferentially offset from each other, and the first stator yoke and the second stator yoke are respectively embedded in the The first skeleton groove and the second skeleton groove.

The first stator yoke and the second stator yoke are formed of a silicon steel lamination, and the width on the inner side is formed in a stepped shape, and when the inner side is disposed on the radially inner side of the skeleton, space can be utilized as much as possible to ensure the entire The magnetic circuit has the largest cross-sectional area, and the outermost laminations in the radially outer diameter portion have different lengths, which can reduce the magnetic leakage between the first stator yoke and the second stator yoke in the circumferential direction. Skeleton seals on both sides of the hub shell prevent foreign matter such as dust, mud, mist, etc. from entering the interior of the generator hub.

When the bicycle is riding forward, the front wheel rotates, and the hub shell rotates relative to the central axis of the hub, the permanent magnet rotates relative to the inner stator assembly fixed on the central shaft of the hub, so that the permanent magnet surrounds the toroidal coil and the first stator yoke And rotating outside the second stator yoke, when the outer side of the first stator yoke receives the N-pole magnetic flux from the permanent magnet, the outer side of the second stator yoke receives the S-pole magnetic flux from the permanent magnet. In contrast, when the outer side of the first stator yoke receives the S-pole magnetic flux from the permanent magnet, the outer side of the second stator yoke receives the N-pole magnetic flux from the permanent magnet. Then the hub generator is repeatedly alternately in the following two states: the first state, the first stator yoke is the S pole, the second stator yoke is the N pole, and the second state, the first stator yoke is the N pole, The second stator yoke is an S pole. As a result, the alternating magnetic flux passes through the inner sides of the first stator yoke and the second stator yoke located inside the radial circumference of the toroidal coil, so that an alternating magnetic flux is generated inside the toroidal coil, and the toroidal coil generates a current, and the current flows through the wire. Transfer out to the junction box. The utility model has the beneficial effects that: the utility model improves the first stator yoke and the second stator yoke, so as to reduce eddy current and leakage flux during power generation, improve power generation efficiency, and set through the sealing ring Improved sealing performance and waterproof performance. (4) Description of the drawings

Figure 1 is a schematic view of the external structure of the present invention.

Fig. 2 is a partial cross-sectional structural view of the embodiment.

3 is a schematic perspective view showing the first stator yoke or the second stator yoke.

4 is a side view of a first stator yoke or a second stator yoke.

Figure 5 is a cross-sectional view of the skeleton of the embodiment.

Figure 6 is a side elevational view of the skeleton of the embodiment.

Fig. 7 is a schematic view showing the structure of a cylindrical core yoke of the embodiment.

Figure 8 is a partial exploded view of the inner stator assembly of the present embodiment.

Figure 9 is a front cross-sectional view of the outer rotor assembly of the present embodiment.

Figure 10 is a side cross-sectional view of the outer rotor assembly of the present embodiment.

Figure 11 is a cross-sectional view showing the relative relationship between the permanent magnet and the yoke of the present embodiment.

Figure 12 is a cross-sectional view of the skeleton sealing mechanism of the present embodiment.

Figure 13 is a comparison diagram of output power of the present embodiment.

(5) Specific implementation methods

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

As shown in Figures 1 and 2, a bicycle hub generator is mounted on the left and right sides 9a and 9b of the bicycle front wheel front fork, and the hub generator includes a hub having both end ends fixed to the front forks 9a and 9b. The center shaft 10, the inner stator assembly 13 fixed to the hub center shaft 10, and the outer rotor assembly rotatable relative to the inner stator assembly 13, the outer rotor assembly including the hub shell 3, the hub shell 3 being fixed in the hub by bearings 11, 12 On the shaft.

As shown in FIGS. 9 and 10, the inner surface of the hub shell 3 is interference-fitted with a permanent magnet steel bushing 4, and the permanent magnet 5 is bonded to the inner ring surface of the permanent magnet steel bushing 4, and the permanent magnet 5 is evenly distributed by four pieces. The magnetic tile is composed, and the permanent magnet 5 is magnetized into 14 N poles and 14 S poles which are evenly staggered. The outer sides of the bearings 11, 12 are respectively provided with a skeleton Sealing rings 30, 31, one end of the hub shell is provided with a hub end cover, and the outer end faces of the hub shell or the hub end cap 8 are respectively provided with sealing ring grooves 17, 18, and the skeleton sealing rings 30, 31 are respectively arranged on the sealing ring In the grooves 17, 18, the skeleton seals 30, 31 rotate with the hub shell 3. As shown in Fig. 12, the radially outer lip portion 27 of the skeleton seal 31 is interference-fitted with the seal groove 18, and the skeleton type The radially inner lip 28 of the sealing ring contacts the hub central shaft. Similarly, as shown in FIG. 12, the radial outer lip portion 35 of the skeleton sealing ring 30 is interference-fitted with the sealing ring groove, and the radially inner lip of the sealing ring The portion 36 contacts the hub central shaft to prevent foreign matter such as dust, muddy water, mist, and the like from entering the inside of the power generating hub. Compared with the existing power generating hub sealing structure, the sealing structure has the advantages of simple, reliable, and low rotational resistance, and can completely prevent moisture from entering the inside of the hub even if the entire hub is placed in water.

As shown in Figures 5 and 6, the inner stator assembly 13 includes a tubular frame 23 fixed to the hub 10 of the hub. The frame 23 is injection molded from a plastic material. The frame 23 is wound with a toroidal coil 26, and the ends of the frame 23 are respectively provided with The first skeleton flange 24 and the second skeleton flange 25 are respectively provided with 14 first skeleton grooves 14 and 14 second skeleton grooves in the circumferential direction of the first skeleton method 24 and the second skeleton flange 25, respectively. In the slot 15, the first skeletal groove and the second skeletal groove are staggered and circumferentially offset from each other by 12.86 degrees, and the first stator magnetic body is respectively embedded in the first skeletal groove 14 and the second skeletal groove 15 The yoke 21 and the second stator yoke 22, the first stator yoke 21 and the second stator yoke 22 are identical in shape and have an open frame shape, and the first stator yoke and the second stator yoke opening are opposed to each other and are alternately arranged. The first stator yoke 21 and the second stator yoke 22 each include an inner side 21a (22a), an outer side 21b (22b), and a connecting side 21c (22c) connecting the inner side and the outer side, the first stator yoke The inner side 21a and the inner side 22a of the second stator yoke are alternately disposed on the inner side of the skeleton, and the inner side of the first stator yoke is The axial end of the inner side of the second stator yoke is connected by a cylindrical core yoke 20, the axial end surface of the inner side of the first stator yoke contacts the side connecting the cylindrical core yoke, and the second stator yoke The axial end surface of the inner side contacts the other side of the cylindrical core yoke 20, and the outer edges 21b, 22b of the first stator yoke and the second stator yoke are alternately disposed on the outer side of the toroidal coil, as shown in FIG. The connecting edges 21c, 22c of the sheet are stepped at the inner end, and the outer edges 21b, 22b of the lamination are stepped at the open end. As shown in FIG. 3 and FIG. 4, the first stator yoke 21 and the second stator yoke 22 are formed by stacking eight 0.5 mm thick non-oriented silicon steel laminations, which are the first piece, the second piece, and the Three, fourth, fifth, sixth, seventh and eighth, the second to the seventh in the middle are the same length, the outermost first and eighth 211 are outside The length of the second to seventh pieces is half of the outer length, the third to sixth pieces 213 in the middle have the same length on the connecting side, and the lengths of the second and seventh pieces 212 on the outer side are on the connecting side. Less than the length of the third "" six piece 213 on the connecting side, the length of the first and eighth pieces 211 on the outermost side on the connecting side is smaller than the length of the second piece and the seventh piece 212 on the connecting side, ie The width of the inner side is stepped, and the first stator yoke and the second stator yoke can fully utilize the size of the inner side of the skeleton to ensure the maximum cross-sectional area of the entire magnetic circuit, and the length of the radial outer diameter can be different. The magnetic leakage in the circumferential direction of the first stator yoke and the second stator yoke is reduced.

As shown in FIG. 7, the cylindrical core yoke 20 is in the shape of a notched ring. The cylindrical core yoke is disposed inside the skeleton 23. The cylindrical core yoke is formed by a non-oriented silicon steel sheet not exceeding 0.5 mm thick and is discontinuous in the circumferential direction. For example, a lmm wide groove, the structural cylindrical core yoke can ensure the maximum contact area of the yoke on both sides, that is, the magnetic circuit has the largest cross-sectional area, reduces the magnetic saturation of the magnetic circuit, and reduces the leakage of magnetic flux passing therethrough. It can also compress the eddy current generated during operation to improve power generation efficiency.

As shown in Fig. 1, the hub shell 3 is forged by an aluminum alloy and then machined to a design size. Both sides of the hub shell 3 are provided with flanges 6, 7, and the flanges 6, 7 are evenly distributed to mount the spokes 1. The spoke hole at the inner end of 2.

As shown in Fig. 9, the first stator yoke and the outer radial claw pole of the second stator yoke in each of the individual magnetic poles and the inner stator assembly correspond to the outer side.

As shown in Fig. 8, the outer portions of the first stator yoke 21 and the second stator yoke 22 are located in the toroidal coil.

Between 26 and the permanent magnet 5, the inner side is located inside the radial circumference of the toroidal coil. One end of the hub shell 3 is provided with a hub end cap 8 for connecting the generated electric energy to the outside of the hub, and the wire 34 passing through the groove in the end cap bearing bushing from the inner surface of the inner bore of the bearing 12 Through the wire to the junction box fixing bushing 29 In the slot, it is connected to the power output plug 19 and is fixed to the hub center shaft 10 through the junction box 16.

When the bicycle is riding forward, the front wheel, that is, the hub shell 3, rotates relative to the hub center shaft 10, the permanent magnet 5 rotates relative to the inner stator assembly 13 fixed to the hub center shaft 10, so that the permanent magnet 5 surrounds the toroidal coil 26. Rotating with the outer sides of the first stator yoke and the second stator yoke, when the outer side of the first stator yoke 21 receives the N-pole magnetic flux from the permanent magnet 5, the outer side of the second stator yoke 22 is from the permanent magnet 5 Receive S pole flux. On the contrary, when the outer side of the first stator yoke 21 receives the S pole magnetic flux from the permanent magnet 5, the outer side of the second stator yoke 22 receives the N pole magnetic flux from the permanent magnet 5.

As shown in FIG. 11, by the rotation of the permanent magnet 5 around the outer sides of the first stator yoke 21 and the second stator yoke 22, the power generating hub is repeatedly alternately in the following two states: First state first stator magnet Yoke 21 is

The S pole, the second stator yoke 22 is an N pole, and in the second state, the first stator yoke 21 is an N pole, and the second stator yoke is an S pole. As a result, the alternating magnetic flux passes through the inner sides of the first stator yoke and the second stator yoke located inside the radial circumference of the toroidal coil, so that an alternating magnetic flux is generated inside the toroidal coil, and the toroidal coil generates a current. Figure 13 shows the power output graph for the hub generator. It can be clearly seen that the output power of the hub motor of the present invention is significantly increased compared to the output power of the existing hub generator.

Claims

Claim

A bicycle hub generator comprising a hub central shaft fixed to a bicycle, wherein said hub has a fixed inner stator assembly and an outer rotor assembly rotatable relative to a hub central shaft, said outer rotor assembly a hub shell, wherein both ends of the hub shell are fixed to the hub central shaft by bearings, and an inner surface of the hub shell is provided with permanent magnets, and the inner stator assembly includes a tubular tube fixed on the shaft of the hub a skeleton, the bobbin is wound with a loop coil, and two ends of the loop coil are circumferentially disposed with a plurality of sets of first stator yokes and a plurality of sets of second stator yokes, wherein: The first stator yoke and the second stator yoke are composed of a plurality of layers of silicon steel lamination, and the first stator yoke and the second stator yoke have the same shape and are open frame shapes, and the first predetermined The sub yoke and the second stator yoke opening are opposite and staggered, and the first stator yoke and the second stator yoke each include an inner side, an outer side, and a connecting side connecting the inner side and the outer side, Inner edge of the first stator yoke The inner sides of the second stator yoke are alternately disposed on the inner side of the bobbin, and the inner side of the first stator yoke and the inner end of the inner side of the second stator yoke are connected by a cylindrical core yoke, the An axial end surface of the inner side of the stator yoke contacts a side connecting the cylindrical core yoke, and an axial end surface of the inner side of the second stator yoke contacts the other side of the cylindrical core yoke, The outer sides of the first stator yoke and the second stator yoke are alternately arranged on the outer side of the toroidal coil, the connecting sides of the laminations are stepped at the inner end, and the outer side of the lamination is formed at the open end. Stepped.

2. The bicycle hub generator according to claim 1, wherein: the first stator yoke and the second stator yoke are each formed of eight silicon steel laminations, which are in turn, the first piece, the first piece. Two pieces, a third piece, a fourth piece, a fifth piece, a sixth piece, a seventh piece, and an eighth piece, the second to the seventh pieces are the same in outer length, the first piece and the eighth piece are in the diameter The length of the outward direction is smaller than the length of the second to the seventh piece on the outer side, the length of the third to sixth pieces is the same on the connecting side, and the length of the second piece and the seventh piece on the connecting side is less than the third to the sixth piece. The length of the first and eighth sheets on the joined side is less than the length of the second and seventh sheets on the joined side.

3. A bicycle hub generator according to claim 1 or 2, wherein: said cylinder The core yoke is in the shape of a notched ring, and the cylindrical core yoke is disposed inside the skeleton.

4. The bicycle hub generator according to claim 3, wherein: a bearing ring is disposed on each of the outer ends of the outer rotor assembly, and the outer end faces of the two ends of the hub shell are respectively provided with a seal. a ring groove, the sealing ring is disposed in the sealing ring groove, the radially outer lip of the sealing ring is interference fit with the sealing ring groove, and the radial inner lip of the sealing ring The part contacts the hub center shaft.

The bicycle hub generator according to claim 4, wherein: the two sides of the skeleton are provided with a first skeleton flange and a second skeleton flange, and the first skeleton flange and the second a plurality of sets of first skeleton grooves and a plurality of sets of second skeleton grooves are uniformly distributed in a circumferential direction of the skeleton flange, and the first skeleton grooves and the second skeleton grooves are alternately arranged and circumferentially offset from each other, The first stator yoke and the second stator yoke are respectively embedded in the first skeleton groove and the second skeleton groove.