CN2434640Y

CN2434640Y - Moment sensor

Info

Publication number: CN2434640Y
Application number: CN 00217870
Authority: CN
Inventors: 叶雪峰; 孙学伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-06-01
Filing date: 2000-06-01
Publication date: 2001-06-13
Anticipated expiration: 2010-06-01

Abstract

The utility model relates to a moment sensor, comprising a front cover, a rear cover, a quadrate tenon hole-shaped cam which is arranged in the center of the front cover and the rear cover, a radial thrust bearing which is sheathed on the quadrate tenon hole-shaped cam, more than two guide bars with springs which are arranged on the rear cover, a displacement nail which is arranged on the lining pad in the radial thrust bearing, and a displacement signal converter which is arranged on the surface of the displacement nail. The liner in the radial thrust bearing is provided with a cam contact head; the lining pad is provided with the limiting nail of the axial displacement which can limit that the quadrate tenon hole-shaped cam is towards the outside, and the rear cover is provided with a rear cover steel ball. The utility model can be arranged on the middle shafts of the bicycle and the wheel chair, and the sensing effect of the moment can be effectively realized.

Description

Torque sensor

The utility model relates to the measurement mechanism of rotary body interaction moment, particularly a kind of torque sensor that is used for the torgue measurement of mechanical transmission course such as bicycle and wheelchair.

In order to protect environment, the electronic aiding bicycle of a large amount of multi-form non-exhaust emissions has appearred on the domestic and international market.Many countries and regions regulation, driven by power and electronic aiding bicycle ownership that need not the manpower effect is motor vehicles only, electronic aiding bicycle then must have the manpower effect, power driven system only gives power and replenishes, Here it is truly electronic aiding bicycle has been made respective specified to the effect ratio of manpower and electric power simultaneously.Replenish in order to make power driven system provide power in proportion, each moment that begins back (comprising static state) from static state all must be measured people's opplied moment, and therefore, electronic aiding bicycle must be equipped with torque measuring device.

For body-building apparatus that is similar to electronic power-assist or wheelchair etc., the user need understand the physical efficiency effect situation of self, also should be equipped with the torque measuring device of this respect on product.

Existing torque sensor then exists following weak point:

1, adopts the complicated sensing principle of tradition, as the strain resistor form.The manufacturing process complexity of its product own, cost height, debug difficulties; Product requires high to actual working environment; The product actual installation needs gearing (as bicycle middle shaft cucurbit part) is implemented repacking, is difficult to generally be applicable to various vehicles.

2, adopt approximate sensing principle, as chain tension gear and axis eccentric wheel mode.Its shortcoming is the actual measurement link instability of moment, exists many enchancement factors and has influence on measurement result; Follow-up circuit modifications compensation can't be described working condition fully.

3, adopt whole method for designing, promptly all need global design that sensing device, manufacturing cost height are installed each vehicle.In fact, for each random vehicle, it can not be as a torque sensor and exist and use independently.

The purpose of this utility model provides a kind of improved torque sensor, and it need not implement repacking to the gearing of bicycle, wheelchair, installs and is applied to carry out on the various vehicles torgue measurement, can realize the sensing effect easily.

A kind of torque sensor described in the utility model is installed on the bicycle middle shaft, it comprises a protecgulum, one bonnet that tightens up by screw and protecgulum, one square mortise shape cam in protecgulum and the setting of bonnet center, radial thrust bearing on one side's of being sleeved on mortise shape cam, inlay the guide rod that is loaded on the bonnet more than two together with the spring that is sleeved on the guide rod, one inlays and is loaded on the nail of the displacement on the liner in the radial thrust bearing, and the displacement signal converter that is installed in displacement nail surface; Described radial thrust bearing comprises the lining on the side's of being sleeved on mortise shape cam, and one to be installed in lining inboard and be threaded onto liner on the guide rod, and a circle is arranged on the liner and is shelved on the liner steel ball along circumferential arrangement on the steel ball shaft shoulder of bonnet; Inlay on the described lining cam contact be housed, also be equipped with on the lining can the outside axial displacement of the side's of restriction mortise shape cam banking pin; Be equiped with the bonnet steel ball on the described bonnet, bonnet steel ball and bonnet and square mortise shape cam constitute an end face thrust bearing.

The utility model can be directly installed on the axis of bicycle, wheelchair of various vehicles, need not implement repacking to its gearing, and its compact conformation, volume are little, easy for installation; Its manufacturing process is simple, and low cost of manufacture is debugged easy, stable; Can be used for the torgue measurement of vehicle according to fully accurate principle, its measurement links fixes, reliable and stable, measurement result accurately and need not follow-up circuit additional corrections compensation, thereby realize the moment sensing effect effectively.

Below in conjunction with accompanying drawing the utility model is elaborated.

Fig. 1 is the installation decomposing schematic representation of a kind of torque sensor and bicycle drive.

Fig. 2 is the structural representation after above-mentioned torque sensor and bicycle drive are installed.

Referring to Fig. 1 and Fig. 2, a kind of torque sensor is installed on the bicycle middle shaft, it comprises a protecgulum 1, one bonnet 2 that tightens up by screw 21 and protecgulum 1, one square mortise shape cam 3 in protecgulum 1 and the setting of bonnet 2 centers, radial thrust bearing on one side's of being sleeved on mortise shape cam 3, inlay the guide rod 4 that is loaded on the bonnet 2 more than two together with the spring 5 that is sleeved on the guide rod 4, one inlays and is loaded in the radial thrust bearing nail of the displacement on the liner 86, and is installed in the displacement signal converter 7 that 6 surfaces are followed closely in displacement.

It is inboard and be threaded onto liner 9 on the guide rod 4 that radial thrust bearing comprises that the lining 8, on the side's of being sleeved on mortise shape cam 3 is installed in lining 8, and a circle is arranged on the liner 9 and is shelved on the liner steel ball 10 along circumferential arrangement on the steel ball shaft shoulder of bonnet 2.

Two are embedded on the bonnet 2 with top guide bar 4, and spring 5 is sleeved on the guide rod 4, and liner 9 also is threaded onto on the guide rod 4, just produce axial displacement and compression spring 5 after liner 9 is stressed, and passed to spring 5 with power this moment.The quantity that guide rod 4 is set can be that measurement performance and structural parameters are decided according to actual conditions.

Inlay on the lining 8 cam contact 11 is housed.Also be equipped with on the lining 8 can the mortise shape cam 3 outside axial displacements of the side of restriction banking pin 12.

Protecgulum 1 forms enclosed construction by the common circular conical surface with lining 8, and it can protect and prevent dust inner structure, can also limit lining 8 outside axial displacements.

Be equiped with bonnet steel ball 13 on the bonnet 2, bonnet steel ball 13 constitutes an end face thrust bearing with bonnet 2 and square mortise shape cam 3.

The outside of side's mortise shape cam 3 is provided with and can installs the stepped slotted eye of banking pin 12 on lining 8, but also is provided with the slotted eye of setting-in cam contact 11.In the stepped slotted eye of banking pin 12 by its mortise shape cam 3 outsides, head of a nail side of being stuck in, promptly come off, realized the structure sealing thereby limited square mortise shape cam 3 outside axial displacements.The cam surface 31 of side's mortise shape cam 3 takes the form of inclined plane.By the width of controlling party mortise shape cam 3 outer slotted eyes, can control the size of the relative rotation between lining 8 and the square mortise shape cam 3, skid off from the cam ramp 31 of square mortise shape cam 3 to prevent cam contact 11, cause sensor failure.

The inboard of side's mortise shape cam 3 is for being set in the groove on the bicycle middle shaft 41.

The course of work of the utility model during as measurement links is as follows:

When square mortise shape cam 3 passes through cam ramp 31 and 11 accurate points of force application of cam contact, power is passed to cam contact 11, produce moment thus and drive lining 8, bicycle chainwheel 42 rotations, because the effect of cam ramp 31, the acting force of side's mortise 3 pairs of cam contacts 11 of shape cam and lining 8 is after decomposing, generation in sensor construction to axial force, promptly lining 8 be subjected in structure to axle pressure.

Lining 8 passes to liner 9 by liner steel ball 10 with the axle pressure that is subjected to, liner 9 stressed backs are to spring 5, guide rod 4 generation effects, be that liner 9 passes to spring 5 along guide rod 4 with axle pressure, deform after spring 5 is stressed, make liner 9 produce measurable axial displacement.

Simultaneously, the displacement nail 6 that is embedded on the liner 9 produces same displacement, becomes the output terminal of a displacement value.

Because the structure and the rigidity parameter of cam ramp 31 parameters of the length of bicycle crank 45, square mortise shape cam 3 and radius of action, spring 5 are known, so the size that 6 axial displacements are followed closely in displacement has just accurately reflected that manpower gives the size of driving force for bicycles.

By follow closely the displacement signal converter of adorning on 6 surfaces 7 in displacement, the value that displacement can be followed closely 6 axial displacement and be driving force converts electric weight to, for the usefulness of follow-up control, demonstration.

During use, the utility model is installed on the bicycle, elder generation's prefabricated three apertures that can pass screw 43 on bicycle chainwheel 42, to develop on the center pit cover side of the installing to mortise shape cam 3 of bicycle chainwheel 42 and with lining 8, three apertures on the bicycle chainwheel 42 are aimed at three screws on the lining 8, with screw 43 that bicycle chainwheel 42 is fixing with lining 8.

Square tenon with the square hole alignment bicycle middle shaft 41 of square mortise shape cam 3 installs to the utility model cover on the bicycle middle shaft 41 again, and its bonnet 2 and the plane of bicycle middle shaft cucurbit 44 are developed.

With the square tenon of the square hole alignment bicycle middle shaft 41 in bicycle crank 45 endoporus, again bicycle crank 45 covers are installed on the bicycle middle shaft 41, and contact with square mortise shape cam 3.Be screwed on the bicycle middle shaft 41 with nut 46 then and also tightened, make the plane of bicycle middle shaft cucurbit 44 keep having contacting of certain pressure each other with square mortise shape cam 3 with 2 bonnets, bicycle crank 45.

The course of work of the present utility model is as follows:

When the cyclist firmly stepped bicycle pedal, because bicycle crank 45 has certain length, manpower had caused certain moment, drove bicycle crank 45 around the rotation of bicycle middle shaft 41 axial lines, made this moment side's of passing to mortise shape cam 3 fully.Side's mortise shape cam 3 passes to cam contact 11 by cam ramp 31 and 11 accurate points of force application of cam contact with power.The power that side's mortise shape cam 3 passes to cam contact 11 has driven the rotation of bicycle chainwheel 42 and lining 8 to the moment that bicycle middle shaft 41 axial lines are produced, and then makes bicycle chainwheel 42 drive chains and drive bicycle and advance.

The embodiment that the utility model is installed on bicycle, the electronic aiding bicycle is the most typical, its embodiment and the embodiment all fours that is applied to wheelchair.

Claims

1. torque sensor, it is installed on the bicycle middle shaft, it is characterized in that, it comprises a protecgulum, a bonnet that tightens up by screw and protecgulum, a square mortise shape cam that is provided with at protecgulum and bonnet center, radial thrust bearing on one side's of being sleeved on mortise shape cam, inlay the guide rod that is loaded on the bonnet more than two together with the spring that is sleeved on the guide rod, one inlays and is loaded on the nail of the displacement on the liner in the radial thrust bearing, and the displacement signal converter that is installed in displacement nail surface; Described radial thrust bearing comprises the lining on the side's of being sleeved on mortise shape cam, and one to be installed in lining inboard and be threaded onto liner on the guide rod, and a circle is arranged on the liner and is shelved on the liner steel ball along circumferential arrangement on the steel ball shaft shoulder of bonnet; Inlay on the described lining cam contact be housed, also be equipped with on the lining can the outside axial displacement of the side's of restriction mortise shape cam banking pin; Be equiped with the bonnet steel ball on the described bonnet, bonnet steel ball and bonnet and square mortise shape cam constitute an end face thrust bearing.

2. torque sensor according to claim 1 is characterized in that, the outside of described side's mortise shape cam is provided with and can installs the stepped slotted eye of banking pin on lining, but also is provided with the slotted eye of setting-in cam contact.

3. torque sensor according to claim 1 is characterized in that, the inboard of described side's mortise shape cam is for being set in the groove on the bicycle middle shaft.

4. torque sensor according to claim 1 is characterized in that, the cam surface of described side's mortise shape cam takes the form of inclined plane.