CN206329702U - Cut cam - Google Patents

Abstract

The utility model is related to a kind of transmission mechanism, specially one kind cuts cam, including frame, drive gear, a number driven tooth, No. two driven tooths, No. three driven tooths, take over a business, cam disc and driven lever, drive gear is articulated with frame, drive gear engages a driven tooth, a number driven tooth is fixedly and coaxially connected with No. two driven tooths and is articulated with frame, No. two driven tooths engage No. three driven tooths, No. three driven tooths are fixedly and coaxially connected, take over a business the breach for having sector, the radius of drive gear is less than a driven tooth, a number driven tooth is more than No. two driven tooths, No. two driven tooths are less than No. three driven tooths, the radius taken over a business is equal to the greatest radius of cam disc, driven lever is fixed with left follower and right follower, left follower is with taking over a business to be affixed, right follower is affixed with cam disc.The utility model in order to solve cam jacking during the larger situation of pressure angle, it is intended that one kind less cam mechanism of pressure angle during jacking is provided.

Description

Cut cam

Technical field

The utility model is related to a kind of transmission mechanism, and specially one kind cuts cam.

Background technology

Cam mechanism is usually by cam, the higher pair mechanism of three component compositions of driven member and frame.Cam is generally made to connect Continuous constant velocity rotation, driven member designs the motion cam mechanisms for enabling it to obtain certain rule and realizes complexity according to requirements Movement needs, are widely used in various automated and semi-automatic mechanical devices.Cam mechanism is generally made up of two part moving parts, That is cam and follower, both are both secured on mounting.Cam gear is quite diverse, therefore nearly all any action is equal It can be produced through a thus mechanism.Cam can be defined as a parts with curved surface or crank slot, can using its swing or revolution So that another component-follower provides motion set in advance.The big portion in path of follower is limited in a chute, to obtain Past it must cover motion.In the stroke of its reply, sometimes by the weight of itself, but some mechanisms is obtain definite action, Often using spring as the power of reply, some then utilize guide groove, it is moved on specific path.

Cam in the heavier object of jacking, and jacking cycle it is shorter when, will have the larger situation of pressure angle, this Drive mechanism to cam generates huge load.

Utility model content

The utility model in order to solve cam jacking during the larger situation of pressure angle, it is intended that provide one kind in jacking During the less cam mechanism of pressure angle.

The utility model provides base case：Cut cam, it is characterised in that including frame, drive gear, No. one it is driven Tooth, No. two driven tooths, No. three driven tooths, take over a business, cam disc and driven lever, the drive gear is articulated with frame, described Drive gear engages a driven tooth, and a driven tooth is fixedly and coaxially connected with No. two driven tooths and is articulated with frame, institute State No. two driven tooths and engage No. three driven tooths, No. three driven tooths are fixedly and coaxially connected, it is described to take over a business to have lacking for sector Mouthful, the radius of the drive gear is less than a driven tooth, with diameter greater than No. two driven tooths of a driven tooth, described two The diameter of number driven tooth is less than No. three driven tooths, it is described take over a business radius be equal to the greatest radius of cam disc, the driven lever Frame is articulated with, the driven lever is fixed with left follower and right follower, and the left follower is with taking over a business to be affixed, the right side Follower is affixed with cam disc.

Operation principle：Use by the larger driven lever jack-up of load within the cycle of a quarter when taking over a business needs When, pressure angle is larger, and the pressure that drive device is born is also just larger.Therefore in this programme, put down side by side using one with taking over a business The cam disc that row is set, the cam disc is with taking over a business to use same drive system, the gear train conduct used in the present embodiment The drive system of power is transmitted, gear train includes drive gear, driven tooth, No. two driven tooths, No. three driven tooths, due to making Same drive system is used, so when take over a business the timing of gearratio one with cam disc, takes over a business the ratio between cycle with cam disc also just Necessarily, in the present embodiment, taking over a business in a quarter cycle, cam disc will rotate a cycle.It is relatively direct to use top The larger pressure angle produced when disk is by driven lever jack-up, in the present embodiment, driven lever is at the sector notch taken over a business When directly can be in contact with cam disc, until driven lever depart from sector notch before, cam disc can carry out the rotation of a cycle. Therefore within the identical time, the pressure angle that cam disc can be in contact with it driven pallet is smaller, therefore back transfer is to drive The power of dynamic system is also just smaller.

Compared with prior art, the advantage of this programme is：1. the cam disc passed through realize reduce pressure angle work With making drive gear be easier jack-up driven lever.

2. when needing the mechanical periodicity of jack-up driven lever, it is only necessary to redesign the size for the sector notch taken over a business then Adjust gear train it is achieved that relative to redesign a new cam it is more easy.

Scheme two：Based on scheme it is preferred, left follower and right follower are roller shape.Beneficial effect：It is left and right from When dynamic friction between portion and driven lever is rolling friction, rub smaller.

Scheme three：For the preferred of scheme two, the rotary speed of drive gear is 4 times of No. three driven tooth rotary speeies, fan The central angle of the breach of shape is 90 °.Beneficial effect：The rotary speed of drive gear be 4 times of No. three driven tooth rotary speeies with The central angle of fan-shaped breach is a preferred value for 90 °, when both are the value, and what driven lever can be natural is transitioned into cam On disk, also can be naturally be transitioned into from cam disc.

Scheme four：For the preferred of scheme three, the distance variable of drive gear and frame.Beneficial effect：Extract drive gear out, Contact position of the cam disc in fan-shaped breach and driven lever is adjusted, after the completion of regulation, drive gear is pushed back again with one The engagement of number driven tooth.

Scheme five：For the preferred of scheme four, the gear bush of drive gear is provided with spring.Beneficial effect：Due to scheme four In refer to that drive gear is movable, but in order to avoid in daily normal work its is disengaged with a driven tooth, setting spring makes drive Moving gear is all the time by a thrust, so as to cannot come off.

Scheme six：For the preferred of scheme five, cam disc is overcoating to be stamped wearing layer.Beneficial effect：Cam disc and driven lever Friction is told, so part needs are protected from deformation emphatically and can not used.

Brief description of the drawings

Fig. 1 cuts the structural representation of cam embodiment for the utility model.

Embodiment

The utility model is described in further detail below by embodiment：

Reference in Figure of description includes：Frame 1, drive gear 2, driven tooth 3, No. two driven tooths 4, three Number driven tooth 5, take over a business 6, cam disc 7, driven lever 8, right roller 82, left wheel 81.

As shown in Figure 1 cuts cam, wherein, including frame 1, drive gear 2, driven tooth 3, No. two driven tooths 4, three Number driven tooth 5, take over a business 6, cam disc 7 and driven lever 8, drive gear 2 is articulated with frame 1, drive gear 2 engage No. one from Dynamic tooth 3, a driven tooth 3 and No. two driven tooths 4 are fixedly and coaxially connected and are articulated with frame 1, No. two engagements of driven tooths 4 three from Dynamic tooth 5, No. three driven tooths 5 are fixedly and coaxially connected 6, and taking over a business 6 has a breach of sector, the radius of drive gear 2 for No. one from / 2nd of dynamic tooth 3, the radius of a driven tooth 3 is twice of No. two driven tooths 4, and the radius of No. two driven tooths 4 is No. three / 2nd of driven tooth 5, thus No. three driven tooths 5 rotating speed be driving tooth a quarter, take over a business it is 6 generally discoid, Sector notch is overall a quarter size, the radius of cam disc 7 with take over a business 6 maximum radius it is equal.Driven lever 8 Left wheel and right roller are fixed with, left wheel is contacted with taking over a business 6, right roller is contacted with cam disc 7.

Operation principle, is pushed up the larger driven lever 8 of load with taking over a business 6 when taking over a business 6 needs within the cycle of a quarter When rising, pressure angle is larger, and the pressure that drive device is born is also just larger.Therefore in this programme, using one with taking over a business 6 side by side The cam disc 7 be arrangeding in parallel, the cam disc 7 uses same drive system, the gear train used in the present embodiment with taking over a business 6 As the drive system of transmission power, gear train includes drive gear 2, driven tooth 3, No. two driven tooths 4, No. three driven tooths 5, due to using same drive system, so when the timing of gearratio one for taking over a business 6 and cam disc 7, taking over a business 6 and cam disc 7 The ratio between cycle is also just certain, in the present embodiment, is taking over a business in 6 a quarter cycles, cam disc 7 will rotate a cycle. The larger pressure angle that relatively direct use is produced when taking over a business 6 by 8 jack-up of driven lever, in the present embodiment, driven lever 8 exists Directly it can be in contact when taking over a business at 6 sector notch with cam disc 7, until driven lever 8 departs from before sector notch, cam disc 7 The rotation of a cycle can be carried out.Therefore within the identical time, cam disc 7 can make the pressure angle that driven pallet is in contact with it It is smaller, therefore back transfer is also just smaller to the power of drive system.

Claims (6)

1. cut cam, it is characterised in that including frame, drive gear, driven tooth, No. two driven tooths, No. three driven tooths, a tops Disk, cam disc and driven lever, the drive gear are articulated with frame, and the drive gear engages a driven tooth, described A number driven tooth is fixedly and coaxially connected with No. two driven tooths and is articulated with frame, and No. two driven tooths engage No. three driven tooths, No. three driven tooths are fixedly and coaxially connected, and described to take over a business to have the breach of sector, the radius of the drive gear is less than one Number driven tooth, with diameter greater than No. two driven tooths of a driven tooth, the diameters of No. two driven tooths be less than No. three it is driven Tooth, it is described take over a business radius be equal to the greatest radius of cam disc, the driven lever is articulated with frame, and the driven lever is fixed There are left follower and right follower, the left follower is with taking over a business to be affixed, and the right follower is affixed with cam disc.

2. according to claim 1 cut cam, it is characterised in that：The left follower is roller shape with right follower.

3. according to claim 2 cut cam, it is characterised in that：The rotary speed of the drive gear is No. three driven tooths 4 times of rotary speed, the central angle of the fan-shaped breach is 90 °.

4. according to claim 3 cut cam, it is characterised in that：The distance variable of the drive gear and frame.

5. according to claim 4 cut cam, it is characterised in that：The gear bush of the drive gear is provided with spring.

6. according to claim 5 cut cam, it is characterised in that：The cam disc is overcoating to be stamped wearing layer.