CN2113383U - Big speed regulation scope multi-disc friction stepless gearbox - Google Patents

Abstract

The utility model discloses a multi-disc friction stepless gearbox; a set of T-shaped disk packs are respectively arranged on an input shaft and an output shaft, and a set of cone disk packs are respectively arranged on two middle shafts; the four shafts are paralleled each other, and two middle shafts are symmetrically arranged at both sides of the middle of the input and output shafts; one end of the T-shaped disk pack is provided with a spring hold-down mechanism; the friction plates of each disk pack are mutually inserted, and the dynamic force is exported through the transferring of the friction disc; because the shaft axis of the two middle shafts is controlled by a manual speed change mechanism, and simultaneously can do parallel translation relative to the input and output shaft center connecting line, the transmission radius is altered, and thus the purpose of speed changing can be achieved. The utility model has the advantages of simple structure, small size and increased speed regulation range.

Description

Big speed regulation scope multi-disc friction stepless gearbox

The utility model relates to a kind of multi-disc type friction stepless gearbox.It comprises multi-disc conical disc group and the multi-disc T shape dish group that plugs together mutually.And the centre distance of conical disc group and T shape dish group can be regulated by speed regulating mechanism.Contact pressure between conical disc and T shape dish is regulated by spring pressure mechanism.

The multi-disk type stepless variable speed unit of the 311st page～313 pages of introductions of volume promptly is the typical structure commonly used of this class speed changer in " design handbook " that chemistry of fuel industry publishing house publishes in September, 1971.In this retarder, rotating speed and moment of torsion rely on conical disc and T shape dish to be in contact with one another the surperficial frictional force that produces that goes up and transmit.The variation of output speed mainly realizes by the centre distance that changes T shape dish and conical disc, method is by the speed governing linkage mechanism three groups of outer dishes (T shape dish) that are mutually 120 degree to be moved radially synchronously with respect to inner disc (conical disc), when two disk center distance increased to maximum value, output speed was the highest; Otherwise when centre distance was minimum value, output speed was minimum.Its spring pressure mechanism is at the axle head of conical disc.

The shortcoming of this stepless speed variator is:

1, the moment of torsion that transmits in order to increase adopts three groups of movably T shape dish groups, therefore makes speed changer bulky, and complex structure;

2, because it adopts the mode of one-level speed change,, obviously less than normal so its fundamental mode speed adjustable range is 3.3 and 4.

The purpose of this utility model is to overcome the deficiency of above-mentioned prior art and provide the multi-disc type that a kind of speed adjustable range is big, simple in structure, volume is small and exquisite friction stepless gearbox for industrial quarters.

This purpose can reach by following technical measures:

T shape dish is designed to two groups, wherein one is assembled on the input shaft, another is assembled on the output shaft, and two shaft axiss are parallel to each other and fix; Conical disc also is two groups, be contained in respectively on the jack shaft separately, its shaft axis all is parallel to the shaft axis of T shape dish and between the shaft axis of two groups of T shapes dishes, simultaneously, its shaft axis can be regulated by speed regulating mechanism, and axial connecting line parallel and that be symmetrical in two groups of T shapes dish moves.The drive path of this speed changer is: power is imported from input shaft, drive is contained in the T shape dish group rotation on the axle, this T shape dish group drives two groups of conical disc rotations that are contained in respectively on two jack shafts again, these two groups of conical disc drive the one group of T shape disc spins that is contained on the output shaft more simultaneously, and last power is exported from output shaft.When under the effect of shaft axis at speed regulating mechanism of two groups of conical disc during away from input shaft, velocity ratio is more and more littler.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is the transmission principle schematic front view.

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

Fig. 3 is embodiment's a structural representation.

Fig. 4 is the B-B sectional view of Fig. 3.

Referring to Fig. 1, Fig. 2.O1 is an input shaft among the figure, and one group of T shape dish is housed on the axle, and its effective transmission radius is R1; O4 is an output shaft, and one group of T shape dish also is housed on the axle, and its effective transmission radius is R4; O2 and O3 are two jack shafts, adorn one group of conical disc on the axle respectively, and shaft axis O1, O2, O3, O4 are all parallel to each other.O2, O3 are between O1, O4, and O2 and O3 can be parallel to O1 under speed regulating mechanism control, O4 moves.When conical disc was positioned at uppermost position in fig-ure, the axle center was O2, O3 position, and its effective transmission radius that contacts with R1 is that the effective radius that r2 ' contacts with R4 is r2; When conical disc is arranged in the most following time (position shown in the figure dotted line), its axle center is O2 ', O3 ' position, and the effective transmission radius that contacts with R1 is r2, and the effective radius that contacts with R4 is r2 '.In the design of present embodiment, make R1=R4=r2=3r2 ', velocity ratio i=(R1)/(r2 ') when then conical disc is in uppermost position in fig-ure (r2)/(R4)=3, promptly the rotating speed of output shaft O4 is 3 times of input shaft O1.Velocity ratio i=(R1)/(r2) (r2 ')/(R4)=1/3 when conical disc is positioned at upper/lower positions, promptly the output shaft rotating speed is 1/3 of an input shaft rotating speed.As seen speed adjustable range is between 1/3～3, and multiple is 9.In like manner, as satisfying R1=R4=r2=4r2 ', then speed adjustable range can be at 1/4～4 when design, and multiple is 16.

Referring to Fig. 3, Fig. 4.There is shown a concrete structure of the utility model speed changer.Input shaft is shaped on spline on (10), and spline upper sleeve is adorned one group of T shape dish (17), and the quantity of T shape dish is according to the torque arithmetic decision of being transmitted.Between per two T shapes dish, insert a slice conical disc (21).Input shaft (10) is by the fore bearing (13) and rear bearing (50) supporting that are contained on the gearbox casing (6).The front end of input shaft is equipped with two locknuts (14), in order to the tightness of Regulation spring (15).Spring (15) heads on gland (16) °, T shape dish (17), pad lid (46).Pad lid (46) abuts against on the shoulder of input shaft (10) right-hand member.Gland (12), filler (11) are that sealing lubricating oil leaks.

Two jack shafts (19) symmetry is positioned at the below of input shaft (10), and parallel with input shaft.Also be shaped on spline on the jack shaft, spline upper sleeve is adorned one group of conical disc (21), and insert between two T shape dishes that are contained on the input shaft on the top of every conical disc, and insert between two T shape dishes that are contained in output shaft (25) bottom.Support by the bearing (20) in the hole that is contained in front axle board (5) and rear axle board (45) respectively at the two ends of jack shaft (19).Bearing gland (18) is contained in the outside of bearing (20).

The structure of output shaft (25) and input shaft (10) is basic identical, it be positioned at input shaft under.The same with input shaft, the spline upper sleeve of output shaft is being adorned one group of T shape dish (31).Locknut (26) Regulation spring (27) of axle front end is to the pressure of gland (30), T shape dish (31), pad lid (34).The two ends of axle are by fore bearing (22) and rear bearing (37) supporting.(24) and (38) be respectively forward and backward bearing cap.Output shaft (25) can stretch out gearbox casing (6) from the right side, drives the working machine of back.Another way of output as shown in Figure 3, output shaft (25) does not stretch out casing (6), adorns a gear (39) at right-hand member, by screw (41) and pad (40) axially locating.Adorn a transmission shaft (55) at the right part box cavity that is arranged in same axis with input shaft (10) in addition, fixed gear on it (54) and gear (39) engagement, the transmission shaft two ends are respectively by bearing (52), (57) supporting, (51) be spacer ring, (53), (56) are bearing cap, its right-hand member stretches out outside the casing, to drive the working machine of back.Dome (58) is shut the hand hole on the casing.Use when hand hole assembling and dismounting.

The drive path of this speed changer is: power is imported into by input shaft (10), and the spline on the axle drives T shape dish and rotates.Because the conical disc that spring (15) coils T shape and be contained on the jack shaft compresses, therefore, conical disc is along with T shape dish rotates synchronously.In like manner, conical disc drives the T shape dish that is contained on the output shaft (25) again and rotates, and the spline of this T shape dish drives output shaft and rotates, and outputs power.

Gear is constructed as follows: the right-hand member of handle (1) is hinged on the top of pillar (44) by pin (43).Pillar (44) bottom has screw thread to be packed on the case lid (3) (or casing).The middle part of handle (1) is connected in the upper end of directional post (2) with pin (42).Handle (1) can be done circular motion around pin (43), and it is upper and lower mobile to drive directional post (2) simultaneously.The center position that case lid (3) is welded on cap ned (4) is passed in the bottom of directional post (2).The both sides of cap ned (4) are fixed by bolts to respectively on front axle board (5) and the rear axle board (45).4 elongated slots are respectively arranged on each shaft bearing plate, bolt (9), (47), (28), (36) are housed respectively in the elongated slot and hold plate (33) and link with preceding supporting plate (32), the rami posterior inferior down that are fixed on preceding supporting plate (7), the back supporting plate (49) on the wall box and are fixed on bottom half respectively, but shaft bearing plate relatively each supporting plate move up and down.(8), (29), (48), (35) are the circular washer equipped with bolt among the figure.

The method of speed change is: when desiring to make output speed to improve, handle (1) upwards can be carried, then drive forward and backward shaft bearing plate (5), (45) simultaneously with respect to moving on the supporting plate, even move on two jack shafts (19), so output speed is accelerated by directional post (2), cap ned (4).When the axle center of jack shaft O2, O3 move among Fig. 1 solid line position, then be maximum speed.Otherwise, to pressing down output speed is reduced on handle (1).When the axle center of jack shaft O2, O3 move among Fig. 1 dotted line position, then be minimum speed.

If also need further to add big speed ratio, can adopt two kinds of approach.The first is with above-mentioned two covers or overlap the disc type stepless speed changer more and directly connect and constitute multistage stepless speed variator.Specifically, be exactly with the output shaft of first order speed changer input shaft as second level speed changer, the same speed changer of thereunder connecting, and the like get final product.

Two of approach is: transmission shaft (55) as output shaft, removed gear (39), (54), gets final product at its right side above-mentioned speed changer of series connection again with spline structure, and the formation of multiple-speed gear-box, and the like.

The utlity model has following advantage:

1, owing to three groups of T shapes dishes that are mutually 120 degree with prior art are reduced to a pair of T shape dish group and conical disc group with frictional drive of overlapping the conical disc group, thereby greatly simplifies the structure, dwindled volume. Can adopt the sheet number that increases every group of T shape dish and conical disc to realize and transmit same torque. And do like this, the increase of speed changer axial dimension is also not obvious.

2, because the one-level speed change of prior art is changed into the two-stage speed change, gearratio is increased greatly, namely speed adjustable range enlarges greatly. Its volume is again much smaller than the dual-range transmission series connection of prior art, thereby has enlarged the scope of application of buncher at mechanical field.

Claims (2)

1, a kind of multi-disc type friction stepless gearbox comprises:

Multi-disc conical disc group that plugs together mutually and multi-disc T shape dish group, and

The centre distance of conical disc group and T shape dish group can be regulated by speed regulating mechanism,

Contact pressure between conical disc and T shape dish is regulated by spring pressure mechanism,

It is characterized in that:

A, T shape dish are two groups, wherein one are assembled on the input shaft, and another is assembled on the output shaft, and two shaft axiss are parallel to each other,

B, conical disc also are two groups, be contained in respectively on two jack shafts, two jack shafts are parallel to input, output shaft and are symmetrical in its middle both sides, simultaneously, the shaft axis of two jack shafts can be controlled by speed regulating mechanism, with respect to input, parallel moving of output axial connecting line while.

2, stepless speed variator according to claim 1 is characterized in that said speed regulating mechanism is to make parallel mobile mechanical mechanism by the bearing spider that a handle that is contained on gearbox casing or the case lid drives two jack shafts.

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