CN203473166U - Torque limiting device in boosting bicycle - Google Patents

Abstract

The utility model discloses a torque limiting device in a boosting bicycle. The torque limiting device comprises a front bicycle frame and a rear bicycle frame, wherein a front wheel is installed on the front bicycle frame, and a rear wheel is installed on the rear bicycle frame. The torque limiting device further comprises a boosting disc internally provided with a force moment conversion device and is further provided with a spring device, wherein the front bicycle frame is fixedly connected with the boosting disc, and the spring device is hinged between the front bicycle frame and the rear bicycle frame. The force moment conversion device comprises a tooth arc frame connected to the interior of the boosting disc in a rotary mode. The rear bicycle frame is connected with a fixing shaft of the tooth arc frame, and a matching part which can be interfered with the inner wall of the boosting disc in the rotation process of the tooth arc frame is arranged on the tooth arc frame. According to the torque limiting device, if the swinging amplitude is excessively large, the side wall of the tooth arc frame will be in contact with the inner wall of the boosting disc, namely interference is generated, the tooth arc frame is prevented from swinging in the boosting disc in the direction, and therefore the change amplitude between the front bicycle frame and the rear bicycle frame is limited; the change amplitude between the front bicycle frame and the rear bicycle frame can be well limited in cooperation with the spring device.

Description

Torque limiting device in a kind of boost bicycle

Technical field

The utility model relates to a kind of bicycle, more precisely, relates to the torque limiting device in a kind of boost bicycle.

Background technology

At present, bicycle, with its economy, environmental protection, the advantage such as convenient, has become the most widely used vehicle in the world, and technical personnel is also constantly making improvements.In existing improvement project, an important directions is exactly that the Gravity changer due to the people's that rides attitude change or the generation of jolting of road in the process of riding is converted into moment, and by complicated step-up system, moment is offered to bicycle middle shaft, for bicycle provides power-assisted.

But Gravity changer is reciprocal, thereby moment direction is also reciprocal.Under prior art condition, be generally to utilize the devices such as ratchet, can only be by the moment loading of a direction in bicycle, the moment of other direction is inoperative, thereby can only be by phased manner for bicycle provides power-assisted.And moment transfer device is as the device being attached on bicycle, need as far as possible compact, lightly, otherwise its deadweight will weaken and even offset power-assisted effect.

In patent CN101683881B, a kind of torque converter is disclosed, the moment of both direction can be converted to the continuous moment output in a direction, but this device is in moment switching process, inside and outside sector is all fixed on sector frame, back and forth moment is only transmitted by a sector frame, easily produces fracture by fatigue.And for making outer sector carry-over moment stable, between outer sector and sector frame, must there is larger fixed area, make the length of sector frame longer, be unfavorable for the compactness of implementation structure.

On the other hand, the vehicle frame of boost bicycle in prior art, it is ridden in process reality, can produce the larger amplitude of jolting (swinging up and down amplitude), although can promote the reinforcement effect of bicycle, can make bicyclist feel obvious discomfort; Meanwhile, the Joint strenght of this kind of structure frame is also difficult to guarantee.

Utility model content

The utility model, in order to solve problems of the prior art, provides the torque limiting device in a kind of boost bicycle, when guaranteeing the reinforcement effect that bicycle is being ridden in process, can reduce the amplitude that it jolts.

In order to realize above-mentioned object, the technical solution of the utility model is: the torque limiting device in a kind of boost bicycle, comprise for the front vehicle frame of front-wheel is installed, and for the rear vehicle frame of trailing wheel is installed, also comprise the booster disc that includes moment transfer device, front vehicle frame is fixedly connected with booster disc, is also provided with the spring installation being hinged between front vehicle frame and rear vehicle frame, described moment transfer device comprises the sector frame being rotatably connected in booster disc, and described rear vehicle frame is connected with the anchor shaft of sector frame; On described sector frame, have at sector frame in rotation process, can produce the auxiliary section of interfering with booster disc inwall.

Preferably, described auxiliary section is the flange that sector frame sidewall extends outward.

Preferably, described sector frame is large, a little sector structure, and auxiliary section is the turning of sector frame stub end both sides.

Preferably, described spring installation is spiral spring, and two ends also tightly polish, and manufactured materials is 60Si2Mn or 55Si2Mn, and spring wire diameter is 8mm-12.5mm, and spring mean coil diameter is 46mm, and spring free height is 100--180mm.

Preferably, the number of active coils of described spring is 3-6 circle.

Torque limiting device of the present utility model, if make amplitude of fluctuation excessive, sector frame sidewall can be encountered the inwall of booster disc, produced interference, that is to say, stop the continuation of sector frame in booster disc to swing according to this direction, thereby defined the rangeability between front vehicle frame and rear vehicle frame; And spring installation is combined together the rangeability that can limit better between front vehicle frame and rear vehicle frame.

Accompanying drawing explanation

Fig. 1 shows the structural representation of vehicle frame in the utility model.

Fig. 2 shows the connection diagram of amplitude control stalk and pipe link in Fig. 1.

Fig. 3 shows the part-structure schematic diagram of back vent in Fig. 1.

Fig. 4 shows the birds-eye view of torque-transmitting coupling in Fig. 3.

Fig. 5 shows the cutaway view at B-B place in Fig. 4.

Fig. 6 shows the schematic diagram of the another kind of embodiment of torque-transmitting coupling.

Fig. 7 shows the connection diagram of Fig. 1 middle part sub-unit.

Fig. 8 shows the section-drawing of spring installation.

Fig. 9 shows the work schematic diagram of vehicle frame.

Figure 10 shows the front view of booster disc.

Figure 11 shows the cutaway view at A-A place in Figure 10.

Figure 12 shows the partial enlarged drawing at I place in Figure 11.

Figure 13 shows the another kind of booster disc and implements structural representation.

Figure 14 shows the cooperation schematic diagram of transmitter shaft assembly and input shaft assembly.

Figure 15 shows the cooperation schematic diagram of sector frame, outer sector, interior sector.

Figure 16 shows the structural representation of Middle shaft assembly.

Figure 17 shows the schematic diagram of the utility model embodiment medi-spring.

Figure 18 shows the schematic diagram that coordinates of sector frame and booster disc.

The specific embodiment

For the technical matters that the utility model is solved, the technical scheme of employing, the technique effect easy to understand of obtaining, below in conjunction with concrete accompanying drawing, the specific embodiment of the present utility model is described further.

With reference to figure 1, a kind of boost bicycle that the utility model provides, comprises the front vehicle frame with front-wheel, booster disc 8 with annexation, and and trailing wheel, booster disc 8 there is the rear vehicle frame of annexation, also comprise the spring installation that connects front vehicle frame, rear vehicle frame.

The step-up system of the utility model boost bicycle is mainly arranged in booster disc 8, and with reference to Figure 10, Figure 11, booster disc 8 is arranged on cycle frame, substitutes traditional five-way.

Figure 10 is the front view of booster disc, and it is comprised of front case 811 and rear housing 820.On front case 811, there are two bolts hole 812, correspondingly, rear housing 820 has two relative bolts hole, and step-up system packs into after front case 811 or rear housing 820, by the interior inserting bolt of bolt hole 812, two housings are assembled and form booster disc 8 together.Those of ordinary skills can imagine, on front case 811 and rear housing 820, can be provided with according to actual needs the bolt hole 12 more than two, make to connect more firm.On front case 811, there is axis hole 813,814,815, for the installation of the Middle shaft assembly 822 shown in Figure 11, transmitter shaft assembly 823, input shaft assembly 824.Correspondingly, on rear housing 820, there is relative axis hole.In order to coordinate the installation of each axle, all can installation shaft bearing 819 in each axis hole 813,814,815.

Middle shaft assembly 822 need to pass from the two ends of booster disc 8, to sprocket wheel and the pedal of bicycle are installed, simultaneously, the one or both ends of input shaft assembly 824 also need to pass from booster disc 8, to connect outside moment, therefore those of ordinary skills can imagine should at least have axis hole 815,813 on front case 811 and rear housing 820.And the moment that mainly plays of transmitter shaft assembly 823 is changed and transfer function, it can adopt structure known in the art to be arranged in booster disc 8, for example, can be arranged in the inner chamber of booster disc 8 by the bearing being fixed in booster disc sidewall deep gouge.

The upper end of front case 811 has a vehicle frame connecting portion 816, on this vehicle frame connecting portion 816, has bolt hole 817, for booster disc 8 being installed to the front vehicle frame of bicycle.Those of ordinary skills can understand, and vehicle frame connecting portion 816 can directly be fixed together by the modes such as welding and vehicle frame.Adopt the mode of bolt can be so that the Assembly &Disassembly of booster disc 8 is more convenient, be also convenient to the maintenance of the step-up system that wherein held, therefore bolt hole 17 is set obviously has more advantage.On vehicle frame connecting portion 816, knock hole 818 can also be set, wherein can insert locating dowel pin, make the assembling of front case 811, rear housing 820 and step-up system more convenient.Those of ordinary skills can imagine at an easy rate, and vehicle frame connecting portion 816 can either be positioned on front case 811, also can be positioned on rear housing 820, or all have vehicle frame connecting portion 816 on front case 811 and rear housing 820.On front case 811 and rear housing 820, all during tool vehicle frame connecting portion 816, the structure of front case 811 and rear housing 820 is roughly symmetrical.This vehicle frame connecting portion 816 can be booster disc 8 deep gouge in region herein.

Figure 11 is the cutaway view at A-A place in Figure 10, there is shown held step-up system.Front case 811 has formed a container cavity 821 after connecting together with rear housing 820, the Middle shaft assembly 822 of input shaft assembly 824, transmitter shaft assembly 823 and bicycle, and each element between them is all accommodated in wherein.

Figure 12 is the partial enlarged drawing at the I place, position shown in Figure 11.As seen from the figure, the connecting bridge between front case 811 and rear housing 820 is interlaced flange, and after both connect, flange coincide mutually, has sealed well container cavity 821, has protected step-up system wherein.

Figure 13 has illustrated the structure that booster disc is further optimized, and at least in the bottom of booster disc 8, is provided with a plurality of gear teeth 827 that extend along casing thickness direction.In the bottom of booster disc 8, increase tooth-shape structure, make, after it collides with ground (obstacle) suddenly, to only have after the gear teeth 827 rupture and could effectively contact booster disc body, thereby can effectively cushion ground or the impulsive force of obstacle to booster disc body.

This booster disc 8 is preferably flat cylindrical, after it is connected with front vehicle frame, structure based on Regular Bicycle, this booster disc 8 is comparatively near trailing wheel, from the position of front-wheel away from, therefore with clockwise as a reference, the terminal that the gear teeth 827 are set on described booster disc 8 sidewalls is at least positioned at seven o ' clock positions on booster disc 8 bodies, further, starting point is positioned at the position at five o'clock on booster disc 8 bodies at the most.

In order further to improve the intensity of booster disc 8, on the end face of described booster disc 8, along its circumferencial direction bulging, there are a plurality of reinforcement projections 828, this reinforcement projection 828 can effectively strengthen the bulk strength of booster disc.

Below the step-up system in the utility model is described in detail.

With reference to Figure 14, Figure 15, be arranged in the input shaft assembly 824 of booster disc 8 and the fit structure of transmitter shaft assembly 823 is as follows: outer sector 8243 and sector frame 8244 are fixed on axle sleeve 8242, and axle sleeve 8242 is fixed on moment input shaft 8241 by modes such as welding, interference fit or keyway connections again.

Those of ordinary skills can understand, and the object that outer sector 8243 and sector frame 8244 are fixed on axle sleeve 8242 is for easy to assembly, and outer sector 8243 and sector frame 8244 can also be directly fixed to moment input shaft 8241, and do not need axle sleeve 8242.Sector frame 8244 one end far away apart from moment input shaft 8241 is fixed with interior sector 8235.

In the present embodiment, interior sector 8235 is bolted on sector frame 8244, but those of ordinary skills can imagine at an easy rate, interior sector 8235 can be fixed on sector frame 8244 by modes such as welding equally, or with sector frame 8244 by casting integrated moulding.Overriding clutch 8237,8239 is fixed on transmitter shaft 8236 in the same way by interior ring separately, and the outer shroud of overriding clutch 8237 is fixed with outer ring gear 8238, and the outer shroud of overriding clutch 8239 is fixed with outer ring gear 82310.In the present embodiment, outer ring gear the 8238, the 82310th, the separately gear of processing, fixedly be assemblied on overriding clutch 8237,8239, but those of ordinary skills can imagine at an easy rate, outer ring gear 8238,82310 can also be the overriding clutch outer shroud itself with external tooth.In this article, the overriding clutch meaning is in the same way, two overriding clutchs are carry-over moment in the same direction, for example, and when the outer shroud of overriding clutch 8237 is along B to B ₁direction rotation time, in it, encircle synchronous rotary thereupon, on the contrary for idle running, overriding clutch 8239 is as the same.Overriding clutch 8237 is by its outer ring gear 8238 and interior sector 8235 engagements that are fixed on sector frame 8244, and overriding clutch 8239 is by its outer ring gear 82310 and outer sector 8243 engagements.The moment mouth of transmitter shaft 8236 is installed with output gear 82311, for to outside output torque, in the present embodiment, to Middle shaft assembly 822 output torques.Preferably the moment mouth of transmitter shaft 8236 coordinates with Middle shaft assembly 822 by spline, not only easy to assembly, and carry-over moment better effects if.Those of ordinary skills can imagine, the moment mouth of transmitter shaft 8236 can also be by outside output torques of calutron such as friction wheel or coils.

In another embodiment of the present utility model, outer sector 8243 can be fixed on sector frame 8244, and sector frame 8244 is a fan-shaped fluted disc, and it has a mounting hole.Interior sector and outer sector are all fixed on the sidewall of mounting hole.Interior sector 8235 is arranged in mounting hole away from one end of moment input shaft 8241, outer sector 8243 is arranged in mounting hole near one end of moment input shaft 8241, the center of circle of the circle at interior sector 8235 and outer sector 8243 places is same, it is the center of moment input shaft 8241, therefore when fan-shaped fluted disc is during along with moment input shaft 8241 swing rotary, interior sector 8235 and outer sector 8243 can continuous workings.Interior sector 8235 is positioned at the first half of fan-shaped fluted disc, the outer ring gear of its engagement overriding clutch.Outer sector 8243 is positioned at the lower part of fan-shaped fluted disc, and it meshes the outer ring gear of another overriding clutch.Interior sector 8235 and outer sector be (plane herein refers to sector frame inswept plane when rotating) in different planes, can regard interior sector as and outer sector staggers mutually.Overriding clutch is installed in the same way, and they are to same direction transmission campaign.

Below in conjunction with Figure 14 and 15, with the outer shroud of overriding clutch 8237,8239 only along B to B ₁direction rotation time, in it ring just thereupon synchronous rotary be example, the principle of work of step-up system of the present utility model is described.

When moment input shaft 8241 is subject to the moment M shown in Figure 14 ₁do the used time, moment input shaft 8241 is along A ₀to A ₁direction rotation, outer sector 8243 and sector frame 8244 are thereupon along A ₀to A ₁direction rotation.As can be seen from Fig. 14, now outer sector 8243 drives the outer shroud of overriding clutch 8239 along B ₁to the direction rotation of B, now, the interior ring of overriding clutch 8239 can not rotate thereupon, i.e. carry-over moment not, and the interior sector 8235 being now fixed on sector frame 8244 drives the outer shroud of overriding clutchs 8237 along B to B ₁direction rotation, now, the interior ring of overriding clutch 8237 rotates thereupon, thereby drives transmitter shaft 8236 along B to B ₁direction rotation.

When moment input shaft 8241 is subject to the moment M shown in Figure 14 ₂do the used time, moment input shaft 8241 is along A ₁to A ₀direction rotation, outer sector 8243 and sector frame 8244 are thereupon along A ₁to A ₀direction rotation.As can be seen from Fig. 14, now outer sector 8243 drives the outer shroud of overriding clutch 8239 along B to B ₁direction rotation, now, the interior ring of overriding clutch 8239 rotates thereupon, thereby drives transmitter shaft 8236 along B to B ₁direction rotation.From Figure 14, Figure 15, now interior sector 8235 drives the outer shroud of overriding clutchs 8237 along B ₁to the direction rotation of B, now, the interior ring of overriding clutch 8237 can not rotate thereupon, i.e. carry-over moment not.

Therefore,, in moment switching process, outer sector 8243 is carry-over moment M only ₂, interior sector 8235 is carry-over moment M only ₁, make power transmission more reliable.Although that moment input shaft 8241 is subject to is M ₁, M ₂the moment of two different directions, but transmitter shaft 8236 is finally all along B to B ₁direction rotation, export the moment of equidirectional.Those of ordinary skills can imagine at an easy rate, when needs transmitter shaft 8236 is all the time along B ₁during to B direction rotation, only overriding clutch 8237,8239 need to be changed to a direction simultaneously and install.For more clear, the non-major parts such as the bearing shown in Figure 14, bearing seat (not mark) are all omitted in Figure 15.

Figure 16 shows the cutaway view of Middle shaft assembly 822, is arranged in the Middle shaft assembly 822 of booster disc 8, and axis 8221 inserts in long sleeve 8222, forms moving cooperation with long sleeve 8222.According in Figure 16 by left-to-right order, on long sleeve 8222, be provided with in order: bearing seat 8226, bearing 8228, force-increasing gear 8223, shaft retaining ring 8225.The Main Function of bearing seat 8226 and bearing 8228 is that Middle shaft assembly 822 is rotatably connected in booster disc 8.The position that long sleeve 8222 passes booster disc has terminal pad 82210 structures, can be used to install the sprocket wheel 8227 of bicycle.

Ratchet or overriding clutch (not shown) have been installed in sprocket wheel 8227, and the outside thread of the termination of axis 8221 is connected and fixes with the negative thread of long sleeve 8222 termination terminal pads 82210.Those of ordinary skills can imagine at an easy rate, bearing seat 8226 and/or bearing 8228 can be arranged in advance and be similar to bicycle bottom bracket equally, or other holds in the device of Middle shaft assembly, but be contained in advance on Middle shaft assembly, more there is the integral installation of being convenient to Middle shaft assembly, therefore have more advantage.Equally, the alternate manners such as sprocket wheel 8227 can also be bolted, rivets, welding are arranged on the terminal pad of long sleeve 8222, but for installation, maintenance object easily, adopt the mode being threaded obviously to have more advantage.In the present embodiment, force-increasing gear 8223 is arranged on long sleeve 8222 by flat key 8224, and preferably flat key 8224 is round end flat key, makes the assembling of force-increasing gear 8223 more convenient.But those of ordinary skills can imagine, force-increasing gear can also be installed on long sleeve 8222 by modes such as welding, splines.Preferred axes back-up ring 8225 has negative thread, and the right side of long sleeve 8222 has outside thread, makes shaft retaining ring 8225 be screwed to the position of being close to force-increasing gear 8223, and force-increasing gear 8223 is carried out to axial location.Certainly, shaft retaining ring 8225 can be welded on long sleeve 8222 equally.

In a concrete embodiment of the present utility model, with reference to Figure 11, Figure 14, Figure 16, the output gear 82311 in transmitter shaft assembly 823 meshes together with the force-increasing gear 8223 in Middle shaft assembly 822.When the output gear 82311 of transmitter shaft assembly 823 drives force-increasing gear 8223 to rotate, can be by driving long sleeve 8222 to rotate, and then drive the sprocket wheel 8227 being contained on long sleeve 8222 terminal pads to rotate, for bicycle provides a proal moment, thereby drive bicycle to move ahead, realized the effect of reinforcement.That is that, regardless of moment input shaft 8241, be subject to is M ₁direction or M ₂the moment of direction, but transmitter shaft 8236 is finally all along B to B ₁direction rotation, export the moment of equidirectional, thus the rotation of drive sprocket in same direction.

When manpower is ridden, due to ratchet being installed in sprocket wheel 8227, thereby limited long sleeve 8222 rotation directions, can not hinder normally and ride.This sprocket wheel with ratchet structure belongs to existing technology, at this, goes its detailed inner structure to repeat no more.

With reference to figure 1, Fig. 7, Fig. 9, the vehicle frame in the utility model comprises front vehicle frame and rear vehicle frame, and described front vehicle frame comprises head tube 1, front pipe 2, standpipe 3, crossbeam 7, and rear vehicle frame comprises back vent 6.

Head tube 1 is for bicycle front fork is installed, and front fork, through head tube 1, is installed front-wheel below, above parts such as installation car handle grade.Head tube 1 is fixedly connected on one end of front pipe 2, and the upper end of standpipe 3 is used for installing the parts such as bike saddle, and the rear prong of back vent 6 is used for installing bicycle rear.The free end of front pipe 2 and standpipe 3 has been fixedly attached on connection auxiliary section 80, is generally the mode of taking welding.Those of ordinary skills can imagine at an easy rate, this connection auxiliary section 80 can be to be bent to form by front pipe 2 or standpipe 3, now, pipe 2 is directly fixedly connected with standpipe 3, for example, or connecting auxiliary section 80 can be also independent member, independent template member or tubular member, front pipe 2 or standpipe 3 are welded to respectively and connect on auxiliary section 80, but adopt template member as linkage section, be more conducive to the installation of figure bicycle with power-increasing dish 8, therefore have more advantage.Although the connection auxiliary section 80 shown in Fig. 7 is fan-shaped, those of ordinary skills can imagine, it can be oblong or other suitable shape.In one of utility model concrete embodiment, the vehicle frame connecting portion 816 on booster disc 8 is made similar fan-shaped deep gouge, connects auxiliary section 80 and can be that to have a cross-sectional plane be U-lag the structure that be combined together corresponding to vehicle frame connecting portion 816.When coordinating, by the U-lag mouth of the 816 Snap joint auxiliary sections 80 of the vehicle frame connecting portion on booster disc, by bolt, be fixed, shape, size between the two match.

It should be noted that back vent 6 there is no annexation with being connected between auxiliary section 80, this makes the front end of back vent 6 have higher degree of freedom.On back vent 6, have a lug, have through hole on lug, hinged for piston sleeve assembly 40, correspondingly, also has similarly the lug 41 for the Hinged piston sleeve assembly other end on standpipe 3.Certainly, those of ordinary skills can imagine, on standpipe 3 or back vent 6, directly open hole, equally can Hinged piston sleeve assembly 40.On piston sleeve assembly 40, spring 4 of the present utility model is installed.Spring 4 and piston sleeve assembly 40 have formed the spring installation in the utility model.

Fig. 8 shows the spring fastenings adopting in embodiment of the present utility model, and the piston sleeve assembly 40 in Fig. 7, has installed spring 4 on it.The big nut 50511 that the inside of sleeve 4051 has deep hole, appearance to have part screw thread and be connected with thread segment, the lower end of sleeve 4051 has a flat connector, is movably connected on the lug of back vent 6; On piston rod 4052, stretch into the piston that position in sleeve 5051 deep holes is provided with several intervals, the other end of piston rod 4052 is hinged on the lug 41 of standpipe 3, and the deep hole bearing fit of these several pistons and sleeve 4051.One backstop dish 40521 also can be set on piston rod 4052.Power transmission spring 4 is arranged between the big nut 50511 of sleeve 4051 and the backstop dish 40521 of piston rod 4052, the elastic force of regulating spring 4 is carried out in the position of rotatable big nut 50511 on sleeve 4051, make the elastic force of spring 4 both can reach the effect of abundant transmission Gravity changer, can adapt to again the people that rides of different weight.Piston sleeve assembly 40 has played connection, fixes, leads and has adjusted and limit the effect of maximum compression stroke.Although in the present embodiment, spring fastenings with piston sleeve assembly 40 for exemplifying, but those of ordinary skills can imagine at an easy rate, spring fastenings can also have with general damping bicycle in the similar structure that adopts of bumper, or other suitable structure.Meanwhile, the mechanism that spring 4 and spring fastenings form, equally can be as bicycle damper, combination in advance, and according to the place of riding, the people's that rides body weight, choose the combination of the different number of coils, different presetting elastic force and carry out rapid-assembling, this seems particularly important when match.

Figure 17 shows structure and several principal parameter of spring 4.H is spring free height, and d is spring wire diameter, and D is spring mean coil diameter.Spring 4 shown in figure is for typically spiral-shaped, and two ends also tightly polish, and supports the number of turns and adopts 1.5 general circles, 2 circles, 2.5 circles all can.Generally, the adult people's that rides body weight should be between 50kg to 100kg, and the forced stroke of the power transmission spring that Gravity changer causes should be between 5-15mm.Forced stroke is excessive, illustrates that spring is excessively soft; Forced stroke is too small, illustrates that spring is really up to the mark, and the unfavorable effect producing is described above.Therefore, the utility model is when carrying out power transmission spring design, and take above-mentioned body weight, two parameters of forced stroke is basis, considers the factors such as acceleration/accel while jolting, safety factor, and requiring the actual maximum rigidity scope of spring is 42-398N/mm.The manufactured materials of spring is generally spring steel, preferably adopt 60Si2Mn or 55Si2Mn, after bakingout process, can reach the requirement of allowable shear stress 628Mpa left and right, flexure stress 785Mpa left and right, modulus in shear 78.5Mpa left and right, modulus of elasticity 196Gpa left and right.Although also can adopt other alloy spring steel, by other processing mode, reach designing requirement, obviously adopt 60Si2Mn or 55Si2Mn to have more economic advantages.And select spring wire diameter d, be that 8mm-12.5mm, spring mean coil diameter D are 46mm, spring free height H while being 100--180mm, can meet design requirement well.Preferably active spring coils number is 3-6 circle.Spring 4 is after surface granosealing, antirust, corrosion-proof performance is better.

With reference to figure 1, Fig. 7, Fig. 9, the front end of back vent 6 is torque-transmitting coupling 62, and centre is longeron part 61, and rear end is rear prong 63.Torque-transmitting coupling 62 coordinates for the booster disc 8 with shown in Fig. 9, transmitting torque.Rear prong 63 is for installing bicycle rear.Therefore spring is passed to Gravity changer on oscillating rod type back vent 6, and on oscillating rod type back vent 6, produces moment of torsion, oscillating rod type back vent 6 by torque-transmitting coupling 62 by moment of torsion pass to booster disc 4 in moment input shaft 8241.

Fig. 4 shows the concrete structure of torque-transmitting coupling 62.As seen from the figure, total is roughly symmetrical about axis A-A, comprises torque-transmitting coupling body 6232.Two spacing section 6231 side from torque-transmitting coupling body 6232 stretched out, two spacing section 6231 and torque-transmitting coupling body 6232 have formed U-shaped prong, each end of spacing section 6231 has downward opening U-lag 62311, for interlock moment input shaft 8241.On torque-transmitting coupling body 6232, have lug 62321, as shown in Figure 5, lug 62321 has bolt hole 62323, for hinged with spring installation.Those of ordinary skills can imagine, lug 62321 can be positioned at longeron part 61 equally, does not affect power transmission effect, but consider from the comfort feature of maintenance, and lug 62321 is positioned at and on torque-transmitting coupling 62, obviously has more advantage.On torque-transmitting coupling body 6232, also there are a plurality of through holes 62322, as lightening hole, further saved material, alleviated weight.Connecting bridge 6233, for to stretch out from the opposite side of torque-transmitting coupling body 6232, is connected in longeron part 61 by modes such as welding, bolt connection, riveted joints, preferably by welding manner, connects.Spacing section 6231, torque-transmitting coupling body 6232 and connecting bridge 6233 form " work " word shapes, preferably by aluminum alloy materials, and YZAlSi12Cu2 for example, die cast, to possess some strength, can bear reciprocal moment of torsion.In order to improve the structural strength of torque-transmitting coupling 62, spacing section 6231 with torque-transmitting coupling body 6232 on also designed strengthening rib 62324.

Fig. 5 is the cutaway view at B-B place in Fig. 4.On spacing section 6231, the both sides of U-lag 62311 extend to form flange downwards, on flange, there is through hole 62312, two spacing section 6231 U-lag 62311 interlocks that form are lived after moment input shaft 8241, and hold-down bolt in through hole 62312 is locked in U-lag 62311 by moment input shaft 8241.

Fig. 6 shows the another kind of embodiment of the utility model torque-transmitting coupling.In this embodiment, in U-lag 62311, embedded prong insert 625.Because U-lag 62311 interlock moment input shafts 8241 are with to its transmitting torque, so its occlusal surface is often stressed, needs higher hardness, to reduce U-lag 62311 distortion, wearing and tearing risk.Prong insert 625 is manufactured by steel material, preferably by Q235 steel making, after surface granosealing, can further improve its hardness.Preferably the outside of prong insert 625 has a plurality of teeth, to improve the chimeric steadiness of itself and U-lag 62311.

On moment input shaft 8241 in the utility model, can make cuboid with the sealed position of U-lag 62311 so that and U-lag 62311 coordinate, prevent that moment input shaft 8241 from skidding in the U-lag 62311 of torque-transmitting coupling 62.

Fig. 9 is the work schematic diagram of the bicycle rack of embodiment of the present utility model, wherein with dotted line, has schematically shown bicycle rear 11, and booster disc 8 is installed in and connects on auxiliary section 80 simultaneously.At road bump or ride people's attitude change in the situation that, on spring 4, draw or press down, and to back vent 6 application of forces, the wheelbase of trailing wheel 11 height overhead remains unchanged substantially, therefore back vent 6 can be take the axle of trailing wheel 11 and swung up and down as pivot, the Gravity changer producing in vertical direction is converted into twisting resistance, by its torque-transmitting coupling 62, pass to the moment input shaft 8241 in booster disc, through intermediate shaft assembly 822, pass to the sprocket wheel 8227 in Middle shaft assembly 822, thereby promote trailing wheel, move ahead.So, just the variation of road bump or the people's posture of riding is converted into the auxiliary power that bicycle advances.Spring installation in the utility model not only plays the effect of reset.More than the elastic force of itself and bicycle rack transmission can reach the twice of the body weight for humans of riding.

Vehicle frame in the utility model, the front vehicle frame that front-wheel is installed is fixedly connected with booster disc body, moment input shaft 8241 after rear vehicle frame is installed trailing wheel and in booster disc 8 is fixing, when riding, variation due to road bump or riding posture, the moment that can produce relative rotation between rear vehicle frame and front vehicle frame, not only can cushion this variation by spring installation, can also play the effect of reset.The vehicle frame of this spline structure, make the intensity of connection lower, particularly, in turning of bicycle, can cause the damage of booster disc and rear vehicle frame junction, and by the rangeability between vehicle frame and front vehicle frame (also can regard Oscillation Amplitude as) after the more difficult control of spring installation.

So, in another preferred embodiment of the present utility model, increased amplitude control stalk 5, with reference to figure 1, Fig. 2, a hinged pipe link 9 on standpipe 3, particularly will, on the sidewall of standpipe 3, fix a mounting bracket 9, also can regard one as is mounting lug, and pipe link 9 is hinged on this mounting bracket 9 or mounting lug, one end of amplitude control stalk 5 is hinged on back vent 6, and the other end is hinged on the free termination of pipe link 9.When the relative position of rear vehicle frame and front vehicle frame changes (while having produced rotating torque), setting angle between amplitude control stalk 5 and pipe link 9, allowing amplitude control stalk 5 to promote pipe link 9 rotates, now, run-on point has three, is respectively the junction, pipe link 9 of the junction, amplitude control stalk 5 of amplitude control stalk 5 and back vent 6 and pipe link 9 and the junction of standpipe 3.By the rotation of these three junctions, make amplitude control stalk 5 can control the rangeability between rear vehicle frame and front vehicle frame, promoted bicyclist's comfort level, also strengthened the Joint strenght between rear vehicle frame and front vehicle frame simultaneously.

On the axle of trailing wheel that above-mentioned amplitude control stalk 5 also can be hinged, mounting bracket 9 also can be fixed on front pipe 2 or crossbeam 7.Vehicle frame in the utility model, the lower end of standpipe 3 and front pipe 2 is fixed on booster disc 8 jointly, moment input shaft 8241 interlocks in back vent 6 and booster disc 8, one end of amplitude control stalk 5 is hinged on back vent, and the other end is hinged in front vehicle frame, and standpipe 3, front pipe 2, back vent 6, amplitude control stalk 5 form four bar structures of vehicle frame, together with booster disc, when having guaranteed the good reinforcement effect of this bicycle, make this vehicle frame there is higher Joint strenght, also controlled the cost of manufacturing simultaneously.

The utility model also provides another to control the structure of rangeability between front vehicle frame and rear vehicle frame, in a concrete enforcement, a kind of torque limiting device is provided, with reference to Figure 10 and Figure 15, booster disc is a flat cylindrical structural, and sector frame 8244 is sector structure, the arc that its side that interior sector 8235 is installed is this sector structure.After being arranged in booster disc 8, moment input shaft 8241 drives sector frame 8244 to swing up and down in booster disc 8, with reference to Figure 18, if amplitude of fluctuation is excessive, the inwall of booster disc 8 can be encountered in the both sides of sector frame 8244 terminations, in the region, C place at the place of meaning shown in Figure 18, interferes, and that is to say, stop the continuation of sector frame 8244 in booster disc 8 to swing according to this direction, thereby defined the rangeability between front vehicle frame and rear vehicle frame.

This torque limiting device can be used in conjunction with spring installation, jointly limits the rangeability between vehicle frame, also can be used in conjunction with together with amplitude control stalk.

In another embodiment of the present utility model, the flange that can stretch out in the sidewall setting of sector frame 8244, when rotating sector frame 8244 to certain angle, the sidewall of this flange and booster disc interferes, thereby stop being rotated further of sector frame 8244, realized equally the position-limiting action of moment of torsion.

The utility model is by preferred embodiment having carried out detailed explanation.Yet, by studying carefully above, to the variation of each embodiment with to increase be also that one of ordinary skill in the art institute is apparent.Being intended that all these variations and increasing of applicant all dropped in the scope that the utility model claim protects.

Similar numbering refers to similar element in the whole text.For clarity, may there is in the accompanying drawings the situation that some line, layer, element, parts or feature are amplified.

Term used herein is only for to be illustrated specific embodiment, and it is not intended to the utility model to limit.Unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) are all identical with the utility model one of ordinary skill in the art's understanding.

Claims (5)

1. the torque limiting device in a boost bicycle, comprise for the front vehicle frame of front-wheel is installed, and for the rear vehicle frame of trailing wheel is installed, also comprise the booster disc that includes moment transfer device, front vehicle frame is fixedly connected with booster disc, also be provided with the spring installation being hinged between front vehicle frame and rear vehicle frame, it is characterized in that: described moment transfer device comprises the sector frame being rotatably connected in booster disc, described rear vehicle frame is connected with the anchor shaft of sector frame; On described sector frame, have at sector frame in rotation process, can produce the auxiliary section of interfering with booster disc inwall.

2. torque limiting device according to claim 1, is characterized in that: described auxiliary section is the flange that sector frame sidewall extends outward.

3. torque limiting device according to claim 1, is characterized in that: described sector frame is large, a little sector structure, and auxiliary section is the turning of sector frame stub end both sides.

4. torque limiting device according to claim 1, is characterized in that: described spring installation is spiral spring, and two ends also tightly polish, manufactured materials is 60Si2Mn or 55Si2Mn, spring wire diameter is 8mm-12.5mm, and spring mean coil diameter is 46mm, and spring free height is 100--180mm.

5. torque limiting device according to claim 4, is characterized in that: the number of active coils of described spring is 3-6 circle.

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