CN101725680B

CN101725680B - Large-scale continuously variable transmission for snowmobile

Info

Publication number: CN101725680B
Application number: CN200910191865XA
Authority: CN
Inventors: 蒋国峰
Original assignee: Chongqing Yongfa Motorcycle Parts Co Ltd
Current assignee: Chongqing Yongfa Technology Co. Ltd.
Priority date: 2009-12-11
Filing date: 2009-12-11
Publication date: 2012-02-29
Anticipated expiration: 2029-12-11
Also published as: CN101725680A

Abstract

The invention discloses a large-scale continuously variable transmission for snowmobile, comprising a driving wheel, a driven wheel and a driving belt connecting the two wheels. The driven wheel comprises one fixed disc and one movable disc which are provided with exterior conical surface as well as a central axis and is characterized in that the axis of the movable disc is provided with a central sleeve, the back of the exterior conical surface of the movable disc is coaxially extended with a circular column coaxial with the central sleeve, and the internal circumference of the circular column is symmetrically provided with three friction blocks; the other end of the central shaft is fixed with a half coupling sleeve provided with spiral surface, the spiral surface is opposite to the friction blocks, and the movable disc can be close to or far away from the half coupling sleeve when the friction block slides on the spiral surface. The fixed disc and movable disc of the driven wheel can rotate synchronously, reliability and synchronism of power transmission are high, and the movable disc can steadily move at different rotating speeds, thus adjusting the distance between the fixed disc and the movable disc and realizing speed changing.

Description

The large-scale buncher that is used for snowmobile

Technical field

The present invention relates to gear, more particularly, relate to be used for the large-scale buncher of snowmobile.

Background technique

Snowmobile be the accumulated snow district the most extensively, the traffic tool easily because its running environment is abominable, claimed structure is reliable, light and flexible, have good accumulated snow ground (or multiple landform) mobility and certain delivered payload capability.Snowmobile is provided with stepless speed variator system, and it is through driving wheel that can change diameter and follower, and the transmission of being overlapped on the two-wheeled brings transmission.Existing motorcycle institute employing stepless speed changes devices, it is to lean on driving wheel to produce centrifugal force through centrifugal roller, forces to drive follower and overcomes the spring resistance in the follower, makes that follower diminishes, driving wheel becomes big, thereby realizes speed change.The process that follower diminishes is: when the fixed tray of driving wheel and the distance between the displacement disc narrowed down, because of belt width is certain, driving belt will be extruded towards the outer circular direction of wheel disc, and it is big that driving wheel becomes; And because the length of driving belt is certain, when driving wheel became big, driving belt can overcome the spring pressure that acts on the follower displacement disc; Rely on the both sides pushed follower displacement disc of driving belt to move towards direction away from fixed tray; Distance between fixed tray and the displacement disc is broadened, and driving belt is the circular direction motion in follower, and follower diminishes; Velocity ratio diminishes, and snowmobile becomes at a high speed.

Because the fixed tray of follower and the rotation of displacement disc are driven by the side of driving belt; When the motorcycle buncher is used for output power height, the bigger snowmobile of load; The synchronism of transmission of power and poor reliability skid easily between the fixed tray of tradition follower and the displacement disc.Quicken or extraneous resistance when increasing suddenly and snowmobile is suddenly anxious under steam; Tractive force is less than resistance; This resistance passes through crawler belt, rear gear box, clutch transmits to the follower fixed tray, and displacement disc continues under the transmission of driving belt, still keeping a high rotational speed, so produce a speed difference between fixed tray in belt wheel and the displacement disc; Also cause the rotation between two dishes asynchronous, influence the synchronism of transmission of power.

Summary of the invention

Technical problem to be solved by this invention is: a kind of large-scale buncher that is used for snowmobile is provided; The fixed tray of its follower and displacement disc can rotate synchronously; The synchronism of transmission of power and reliability are high; Displacement disc can steadily move under different rotating speeds, thereby the spacing of adjustment fixed tray and displacement disc realizes speed change.

Technological scheme of the present invention is following: a kind of large-scale buncher that is used for snowmobile comprises driving wheel, follower and is connected the driving belt of two-wheeled that said follower has fixed tray and the displacement disc and the central shaft of band male cone (strobilus masculinus); Said fixed tray is fixed on central shaft one end; Said displacement disc slides on this central shaft, and the male cone (strobilus masculinus) of fixed tray and displacement disc is relative, and the axis of the said displacement disc in edge is provided with central sleeve; Extend axially the annulated column coaxial at the back side of said displacement disc male cone (strobilus masculinus) with this central sleeve; In this annulated column, circumferentially be symmetrically distributed with three pairs of brake pads, be fixed with half joint sleeve at the other end of said central shaft, an end of this half joint sleeve circumferentially is symmetrically distributed with three double wedges of band helicoid; The front portion of said double wedge is stretched in the annulated column of said displacement disc; Helicoid on the double wedge is relative with said brake pad, and the lift angle of said helicoid is 37～42 degree, between said half joint sleeve and displacement disc, spring is housed; When brake pad slides on said helicoid, said displacement disc can near or away from said half joint sleeve;

The interior round Spielpassung of the cylindrical of said half joint sleeve and said annulated column; The oblique triangle of presenting the drift angle abate after three double wedges on said half joint sleeve launch; Two oblique sides of said double wedge are respectively long helicoid and short helicoid, and the lift angle of long helicoid is 37～42 degree and less than the lift angle of lacking helicoid, when said spring is not compressed; The top of said long helicoid is near said brake pad, and long helicoid is the working screw face;

The bottom surface of said annulated column is provided with three limited impressions that circumferentially are symmetrically distributed; This limited impression is between two adjacent said brake pads; When said brake pad slides to the root of long helicoid and during to limit position; The top of said double wedge falls into said limited impression, thereby the restriction displacement disc is near the limit position of half joint sleeve.

The present invention is provided with half joint sleeve on the central shaft of follower; Driving wheel becomes big during speedup, and the follower displacement disc receives axial force under the extruding of the inclined-plane of driving belt, and the brake pad of displacement disc overcomes spring pressure under this axial force; Helicoid top by half joint sleeve slides to root; Displacement disc moves axially in rotation, and displacement disc steadily slides to half joint sleeve, thereby the distance between fixed tray and the displacement disc is broadened; Because when work, displacement disc offseted and synchronous the rotation through brake pad and flank of thread and half joint sleeve; And half joint sleeve is fixed on the central shaft, has so just realized the synchronous rotation of the fixed tray on displacement disc and the central shaft, and the synchronism of transmission of power and reliability are high; Suddenly anxious the acceleration or extraneous resistance when increasing suddenly in going, tractive force are during less than resistance, and resistance is delivered on fixed tray and half joint sleeve through crawler belt, rear gear box, clutch, follower central shaft; The half joint sleeve speed that makes reduces; Between half joint sleeve and the displacement disc by the driving belt drive, have speed difference, the brake pad of displacement disc just slides to the top by its root on the helicoid of half joint sleeve, and displacement disc steadily slides to fixed tray; Thereby the distance between fixed tray and the displacement disc is narrowed down; It is big that follower becomes, and speed reduces, and tractive force increases.

As preferably; Said brake pad is a pair of by left and right half side group; Left and right half side three both sides that are the installation base of 120 degree distributions that are separately fixed at; Said installation base extends axially from the bottom surface of said annulated column and reclines mutually with the inner cylindrical surface of annulated column, and the last drift angle of a relative side with helicoid is a circular arc on the said brake pad.Because three double wedges lay respectively between the installation base, this just make half joint sleeve just changeing still counter-rotating all with the circular arc of brake pad on drift angle offset, thereby protection displacement disc and half joint sleeve are avoided vibrations and noise.

As preferably, the two ends seat ring of said spring is enclosed within respectively on the interior ring of central sleeve and half joint sleeve of said displacement disc, and the two ends of said spring is inserted respectively in the axial bore set on displacement disc and half joint sleeve.When displacement disc during near half joint sleeve; Spring not only is compressed and also bears moment of torsion, makes that working as the deceleration follower will become greatly, when needing displacement disc near fixed tray; Brake pad slides to the restoring force at top by its root on helicoid bigger, and two dishes are closed smooth and easy, steadily rapidly.

The invention has the beneficial effects as follows: can guarantee that the fixed tray of follower and displacement disc rotate synchronously, the synchronism of transmission of power and reliability are high, and displacement disc can steadily move under different rotating speeds, thereby the spacing of adjustment fixed tray and displacement disc realizes speed change.

Description of drawings

Fig. 1 is the schematic representation of follower end on projection of the present invention.

Fig. 2 is the A-A sectional view of Fig. 1.

Fig. 3 is the B-B sectional view of Fig. 1.

Fig. 4 is the schematic perspective view of displacement disc among Fig. 2.

Fig. 5 is the schematic representation of the end face direction of half joint sleeve.

Fig. 6 is the C-C sectional view of half joint sleeve.

Fig. 7 is that the D of Fig. 5 is to launching schematic representation.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described further:

The present invention is a kind of large-scale buncher that is used for snowmobile; Comprise driving wheel, follower and be connected driving wheel and the driving belt of follower; Driving wheel changes the distance of driving disc and displacement disc through centrifugal principle; The structure of its follower, to shown in Figure 4, follower mainly is made up of fixed tray 1, displacement disc 2, central shaft 3, half joint sleeve 4, brake pad 5 and spring 6 like Fig. 1.Wherein, The fixed tray 1 and the displacement disc 2 of follower have male cone (strobilus masculinus); The male cone (strobilus masculinus) of fixed tray 1 and displacement disc 2 is relative, and fixed tray 1 is fixed on central shaft 3 one ends, and the central sleeve 2a that displacement disc 2 is provided with through its axis slides on the central shaft 3; Extend axially the annulated column 2b coaxial with this central sleeve 2a at the back side of displacement disc 2 male cone (strobilus masculinus)s; In this annulated column 2b, circumferentially be symmetrically distributed with three pairs of brake pads 5, every pair of brake pad 5 is by left and right half side the composition, the left and right half side both sides that are fixed on three installation base 2d respectively through its bottom surface to the latch that extends below; Three installation base 2d are 120 degree and are distributed on the bottom surface of annulated column 2b, and this installation base 2d extends axially from the bottom surface of annulated column 2b and reclines mutually with the inner cylindrical surface of annulated column 2b.

Like Fig. 2, Fig. 5 to shown in Figure 7; The other end at central shaft 3 is fixed with half joint sleeve 4 through key; Between half joint sleeve 4 and displacement disc 2, spring 6 is housed; The two ends seat ring of spring 6 is enclosed within respectively on the interior ring of central sleeve 2a and half joint sleeve 4 of displacement disc 2, and the two ends 6a of

spring

6,6b insert respectively in the axial bore set on displacement disc 2 and half joint sleeve 4, make spring 6 not only as stage clip also as torsion spring.Circumferentially be symmetrically distributed with three double wedge 4a of band helicoid on the one end outer shroud of half joint sleeve 4; The oblique triangle that double wedge 4a presents the drift angle abate after launching; The two oblique sides of double wedge 4a are respectively long helicoid 4b and short helicoid 4c, and the lift angle a of long helicoid 4b is 40 degree, and the lift angle b of short helicoid 4c is 50 degree; The front portion of double wedge 4a is stretched among the annulated column 2b of displacement disc 2; The last drift angles that brake pad 5 left and right half side goes up with two helicoid opposite flanks are circular arc, and three double wedge 4a lay respectively between the installed adjacent boss 2d, and this just makes half joint sleeve 4 just change still to reverse that all drift angle offsets on the circular arc with brake pad 5; Thereby protection displacement disc 2 and half joint sleeve 4 are avoided vibrations and noise.When spring 6 is not compressed; The top of long helicoid 4b is near half side brake pad 5 and relative with the last drift angle of its circular arc; The interior round Spielpassung of the cylindrical of half joint sleeve 4 and annulated column 2b, when half side brake pad 5 slides on long helicoid 4b, displacement disc 2 can near or away from half joint sleeve 4.

Like Fig. 2 and shown in Figure 5; On the bottom surface of annulated column 2b, be provided with three limited impression 2c that circumferentially are symmetrically distributed; This limited impression 2c is between two pairs of adjacent brake pads 5; When brake pad 5 slides to the root of long helicoid 4b and during to limit position, the top of double wedge 4a falls into limited impression 2c, thereby restriction displacement disc 2 is near the limit position of half joint sleeve 4.

The present invention is work like this: along with the raising of engine speed, the driving wheel displacement disc moves the spacing increase between the two-wheeled because the effect of centrifugal mechanism deviates from fixed tray; It is big that driving wheel becomes; Because driving belt length is constant, the driving belt on the follower can move by inside circular direction, and follower displacement disc 2 receives axial force under the extruding of the inclined-plane of driving belt; Brake pad 5 on the displacement disc 2 overcomes the pressure and the torsion of spring 6 under this axial force; Long helicoid 4b top by half joint sleeve 4 slides to root, and displacement disc 2 moves axially in rotation, and displacement disc 2 steadily slides to half joint sleeve 4; Thereby the distance between fixed tray 1 and the displacement disc 2 is broadened; Brake pad 5 offsets with long helicoid 4b all the time during work, and displacement disc 2 is just realized rotation synchronously through half joint sleeve 4 and central shaft 3 and fixed tray 1, and the synchronism of transmission of power and reliability are high; Suddenly anxious the acceleration or extraneous resistance when increasing suddenly in going, tractive force are during less than resistance, and resistance is delivered on fixed tray 1 and half joint sleeve 4 through crawler belt, rear gear box, clutch, follower central shaft 3; Make half joint sleeve, 4 speed reduce; Between half joint sleeve 4 and the displacement disc 2 by the driving belt drive, have speed difference, the brake pad 5 on the displacement disc 1 just slides to the top from the long helicoid 4b root of half joint sleeve 4, and displacement disc 2 steadily slides to fixed tray 1; Thereby the distance between fixed tray 1 and the displacement disc 2 is narrowed down; It is big that follower becomes, and speed reduces, and tractive force increases; When engine retard, driving wheel diminishes, and the outside circular direction of the driving belt on the follower moves; Imposing on displacement disc 2 axial forces by driving belt reduces; Displacement disc 2 is under the pressure and torsion of spring 6, and brake pad 5 slides to the top by the long helicoid 4b root of half joint sleeve 4, and displacement disc 2 moves axially to fixed tray 1 in rotation reposefully; Thereby the distance between fixed tray 1 and the displacement disc 2 is narrowed down, realize slowing down.

Claims

1. large-scale buncher that is used for snowmobile; Comprise driving wheel, follower and be connected the driving belt of two-wheeled; Said follower has fixed tray (1) and the displacement disc (2) and the central shaft (3) of band male cone (strobilus masculinus), and said fixed tray (1) is fixed on central shaft (3) one ends, and said displacement disc (2) slides on this central shaft (3); The male cone (strobilus masculinus) of fixed tray (1) and displacement disc (2) is relative; Axis along said displacement disc (2) is provided with central sleeve (2a), extends axially the annulated column (2b) coaxial with this central sleeve (2a) at the back side of said displacement disc (2) male cone (strobilus masculinus), it is characterized in that: in this annulated column (2b), circumferentially be symmetrically distributed with three brake pads (5); The other end at said central shaft (3) is fixed with half joint sleeve (4); One end of this half joint sleeve (4) circumferentially is symmetrically distributed with three double wedges (4a) of band helicoid, and the front portion of said double wedge (4a) is stretched in the annulated column (2b) of said displacement disc (2), and helicoid on the double wedge (4a) and said brake pad (5) are relative; The lift angle of said helicoid is 37～42 degree, between said half joint sleeve (4) and displacement disc (2), spring (6) is housed; When brake pad (5) slides on said helicoid, said displacement disc (2) can near or away from said half joint sleeve (4);

The interior round Spielpassung of the cylindrical of said half joint sleeve (4) and said annulated column (2b); The oblique triangle that three double wedges (4a) on said half joint sleeve are presented the drift angle abate after launching; Two oblique sides of said double wedge (4a) are respectively long helicoid (4b) and short helicoid (4c); The lift angle of long helicoid (4b) is 37～42 degree and less than the lift angle of short helicoid (4c), said spring (6) is not when being compressed, and the top of said long helicoid (4b) is near said brake pad (5);

The bottom surface of said annulated column (2b) is provided with three limited impressions (2c) that circumferentially are symmetrically distributed; This limited impression (2c) is positioned between the two adjacent said brake pads (5); When said brake pad (5) slides to the root of long helicoid (4b) and during to limit position, the top of said double wedge (4a) falls into said limited impression (2c).

2. the large-scale buncher that is used for snowmobile according to claim 1; It is characterized in that: said brake pad (5) is a pair of by left and right half side group; Left and right half side three both sides that are the installation base (2d) of 120 degree distributions that are separately fixed at; Said installation base (2d) extends axially from the bottom surface of said annulated column (2b) and reclines mutually with the inner cylindrical surface of annulated column (2b), and the last drift angle that said brake pad (5) is gone up a relative side with helicoid is a circular arc.

3. the large-scale buncher that is used for snowmobile according to claim 1; It is characterized in that: the two ends seat ring of said spring (6) is enclosed within respectively on the interior ring of central sleeve (2a) and half joint sleeve (4) of said displacement disc (2), and the two ends of said spring (6) (6a, 6b) inserts displacement disc (2) respectively and half joint sleeve (4) is gone up in the set axial bore.