CN204852216U - Awl tooth swing speed change gear - Google Patents

Abstract

A bevel gear swing speed change device, the device includes a machine body, which includes a main casing and a bevel gear end cover, and the bevel gear end cover is provided with conical teeth; a transmission shaft, which includes a first transmission shaft and a second transmission shaft, the first The axis centers of the first transmission shaft and the second transmission shaft coincide; the skew wheel, which is fixed on the second transmission shaft; the bevel tooth balance, which is fixed on the skew wheel, and the bevel tooth balance meshes with the bevel tooth end cover ; The tooth number difference between the bevel tooth balance wheel and the bevel tooth end cover and the gear ratio of the bevel tooth end cover constitute the transmission ratio of the speed change mechanism; the dial is arranged on the bevel tooth balance wheel; When the wheel rotates, it drives the bevel tooth balance wheel to engage and roll on the bevel teeth of the bevel tooth end cap to form a compound motion of conical swing and rotation, and the rotation drives the first transmission shaft to rotate through the toggle piece. The device has high gear ratio and transmission efficiency, simple structure, easy production and processing, low production cost and wide application.

Description

Bevel gear swing transmission

【Technical field】

The utility model relates to a speed change mechanism, in particular to a bevel gear swing speed change device capable of realizing single-stage large-scale speed change.

【Background technique】

Various speed change mechanisms are widely used in the mechanical field, including speed-increasing mechanisms and deceleration mechanisms, which are used to increase and decrease the output speed of mechanical equipment. Traditional large transmission ratio mechanisms mainly include multi-stage planetary gear transmission mechanisms, harmonic gear transmission mechanisms, worm gear transmission mechanisms, eccentric cycloid transmission mechanisms, etc. have their own limitations. Among them, the disadvantages of the planetary gear transmission mechanism are large volume, heavy weight, complex structure, and high production cost; the transmission efficiency of the worm gear transmission mechanism is low, it can only be used in the reduction mechanism, and it is difficult to process; the harmonic gear transmission mechanism needs to use Manufactured from special materials, processing is difficult, and the production cost is extremely high; the structure of the eccentric cycloid transmission mechanism is complex, and the single-stage transmission ratio is relatively small. Therefore, it becomes an objective demand to develop a speed change mechanism that can improve the speed change ratio of the speed change mechanism, has a simple structure, high transmission efficiency, is easy to produce and process, and has low production cost.

【Content of invention】

The utility model aims to solve the above problems, and provides a bevel gear swing speed changer with high speed ratio and transmission efficiency, simple structure, easy production and processing, low production cost and wide application.

In order to achieve the above purpose, the utility model provides a bevel gear swing speed change device, the mechanism includes:

The machine body includes a main shell and a bevel end cover, one side of the bevel end cover is provided with conical teeth;

The transmission shaft includes a first transmission shaft and a second transmission shaft, the axis centers of the first transmission shaft and the second transmission shaft coincide, the first transmission shaft is supported on the main housing through the first bearing, and the second transmission shaft passes through The second bearing and the third bearing are supported on the bevel end cover and the first transmission shaft;

a skew wheel, which is fixed on the second transmission shaft;

a bevel tooth balance wheel, which is fixed on the skew wheel through a fourth bearing, and the bevel tooth balance wheel is meshed with the bevel tooth end cover;

The tooth number difference between the bevel gear balance wheel and the bevel gear end cap and the gear ratio of the bevel gear end cap constitute the transmission ratio of the speed change mechanism;

a plurality of dials, which are arranged on the opposite side of the bevel tooth balance and its bevel teeth; and

When the second transmission shaft drives the skew wheel to rotate, it drives the bevel tooth balance wheel to engage and roll on the bevel teeth of the bevel gear end cover, forming a compound motion of conical swing and rotation, and it rotates through the bevel gear. The toggle member drives the first transmission shaft to rotate.

One end of the first transmission shaft is provided with a shaft shoulder, and the center of the shaft shoulder is provided with a third bearing hole for installing the third bearing, and a plurality of grooves or grooves for inserting the toggle member are provided on the edge close to the shaft shoulder. The hole, the diameter of the groove or hole is larger than the diameter of the toggle member, forming a movable fit that the toggle member can enter and disengage.

The bevel gear end cover is a plate-shaped body, with a second bearing hole in the center, and a bevel gear on the side opposite to the main housing.

The skew wheel is fixed on the middle part of the second transmission shaft through its shaft hole, the center line of the outer circumferential surface of the skew wheel is inclined and intersects the central axis of the first transmission shaft and the second transmission shaft, and the skew wheel The intersection point of the central line of the first transmission shaft and the central axis of the second transmission shaft is located at the intersection of the bevel tooth end cover and the bevel tooth index line of the bevel tooth balance wheel.

The center of the bevel tooth balance wheel is provided with a fourth bearing hole, and the side of the bevel tooth balance wheel opposite to the bevel tooth end cover is provided with conical teeth, and the bevel tooth index line between the bevel tooth balance wheel and the bevel tooth end cover Intersecting at one point, the other side of the bevel tooth balance wheel is provided with a plurality of toggle pieces near the edge, and the end of the toggle piece in contact with the groove on the shoulder of the first transmission shaft is cylindrical or conical, so The bevel tooth end cover and the bevel tooth index line of the bevel tooth balance intersect at one point.

The toggling member is a dial pin, a dial tooth or a dial key, and the said dial pin, dial tooth or dial key is fixed in the hole on the bevel tooth balance wheel or integrally formed on the side surface of the bevel tooth balance wheel, corresponding to it , the slots or holes on the shoulder of the first transmission shaft are respectively pin holes, tooth slots or key slots, and the size of the pin holes, tooth slots or key slots is larger than the size of the dial pin, shift tooth or dial key.

In another solution of the present utility model, the bevel gear swing speed change device includes:

an airframe comprising a main housing and end caps;

The transmission shaft includes a first transmission shaft and a second transmission shaft, the axis centers of the first transmission shaft and the second transmission shaft coincide, the first transmission shaft is provided with a shaft shoulder, and one side of the shaft shoulder is provided with conical gears, The first transmission shaft is supported on the main casing through the first bearing, and the second transmission shaft is supported on the end cover and the first transmission shaft through the second bearing and the third bearing;

a skew wheel, which is fixed on the second transmission shaft;

a bevel tooth balance wheel, which is fixed on the skew wheel through a fourth bearing, and the bevel tooth balance wheel meshes with the conical teeth of the first transmission shaft;

The gear ratio of the speed change mechanism is constituted by the tooth number difference between the bevel tooth balance wheel and the bevel tooth of the first transmission shaft and the bevel tooth balance wheel gear ratio;

a plurality of dials, which are arranged on the opposite side of the bevel tooth balance and its bevel teeth; and

When the second transmission shaft drives the skew wheel to rotate, it drives the bevel tooth balance wheel to perform conical oscillation, and drives the first transmission shaft to rotate through its meshing with the bevel gear of the first transmission shaft.

A third bearing hole for installing a third bearing is provided at the center of the shoulder of the first transmission shaft.

The center of the end cover is provided with a second bearing hole, and the end cover is provided with a plurality of slots or holes near the edge for inserting the toggle piece, and the diameter of the slots or holes is larger than that of the toggle piece.

The skew wheel is fixed on the middle part of the second transmission shaft through its shaft hole, the center line of the outer circumferential surface of the skew wheel is inclined and intersects the central axis of the first transmission shaft and the second transmission shaft, and the skew wheel The intersection point of the central line of the first transmission shaft and the central axis of the second transmission shaft is located at the intersection of the bevel tooth balance wheel and the bevel tooth index line of the bevel gear of the first transmission shaft.

The center of the bevel tooth balance wheel is provided with a fourth bearing hole, and the side of the bevel tooth balance wheel opposite to the shaft shoulder of the first transmission shaft is provided with conical teeth, and the bevel tooth balance wheel is connected to the shaft shoulder of the first transmission shaft. The bevel tooth indexing lines of the bevel teeth intersect at one point, and the other side of the bevel tooth balance near the edge is provided with a plurality of axial toggle pieces, the bevel tooth balance and the conical cone of the shoulder of the first transmission shaft The bevel tooth index lines of the teeth intersect at one point.

The toggling member is a dial pin, a dial tooth or a dial key, and the said dial pin, dial tooth or dial key is fixed in the hole on the bevel tooth balance wheel or integrally formed on the side surface of the bevel tooth balance wheel, corresponding to it , the slots or holes on the end cover are respectively pin holes, tooth slots or key slots, and the size of the pin holes, tooth slots or key slots is larger than the size of the dial pin, shift tooth or dial key.

The setting positions of the toggle piece and the slot or hole for inserting the toggle piece can be interchanged.

The contribution of the utility model is that it effectively solves the problems of the existing transmission mechanism such as small gear ratio, low transmission efficiency, large volume, complex structure and processing. The transmission ratio of the transmission mechanism of the utility model is determined by the tooth number difference between the bevel tooth balance wheel and the bevel tooth end cover and the gear ratio of the bevel tooth end cover. Therefore, the transmission ratio of the transmission mechanism can be greatly improved by changing this ratio, and can The transmission efficiency of the transmission mechanism is greatly improved. The utility model realizes the utility model by setting the meshing rolling structure of the bevel gear balance wheel and the bevel gear end cover to form a compound motion of conical swing and rotation, and drive the first transmission shaft to rotate through the rotating part through the rotating part. The large transmission ratio output of the transmission device. The utility model has the advantages of compact structure, small size, easy production and processing, low production cost and wide application in the field of mechanical transmission.

【Description of drawings】

Fig. 1 is a sectional view of the overall structure of Embodiment 1 of the present utility model.

Fig. 2A is a right view of the bevel gear end cap in Fig. 1 .

Fig. 2B is a side cross-sectional view of Fig. 2A.

Fig. 3A is a right side view of the main casing in Fig. 1 .

Fig. 3B is a side cross-sectional view of Fig. 3A.

Fig. 4A is a left side view of the skew wheel in Fig. 1 .

Fig. 4B is a side cross-sectional view of Fig. 4A.

Fig. 5A is a right side view of the bevel balance wheel in Fig. 1 .

Fig. 5B is a side cross-sectional view of Fig. 5A.

Fig. 6 is a side sectional view of the first drive shaft in Fig. 1 .

Fig. 7 is a sectional view of the overall structure of Embodiment 2 of the present utility model.

Fig. 8A is a right side view of the end cap in Fig. 7 .

Fig. 8B is a side cross-sectional view of Fig. 8A.

Fig. 9 is a side sectional view of the first transmission shaft in Fig. 7 .

【Detailed ways】

The following examples are further explanations and illustrations of the utility model, which do not constitute any limitation to the utility model.

Example 1

As shown in FIGS. 1 to 6 , the bevel gear swing transmission device of the present invention includes a body 10 , a transmission shaft 20 , a skew wheel 30 , a bevel gear balance 40 and a toggle member 50 .

As shown in Fig. 1, Fig. 2A, and Fig. 2B, the body 10 includes a main casing 11 and a bevel tooth end cover 12, wherein the main casing 11 is a hollow disc-shaped casing with one side open, and at its center A first bearing hole 111 is provided for installing the first bearing 23 . The bevel gear end cover 12 is a plate-shaped body corresponding to the shape of the main housing 11 , and the center of the bevel gear end cover 12 is provided with a second bearing hole 121 for installing the second bearing 24 . Conical teeth are provided on the surface near the edge of the side of the bevel tooth end cover 12 opposite to the main housing 11 , and the conical teeth on the bevel tooth end cover 12 are fixed teeth. The bevel tooth end cover 12 is connected with the main housing 11 as a whole by screws.

As shown in FIG. 1 , a transmission shaft 20 is provided inside the machine body 10 , the transmission shaft 20 includes a first transmission shaft 21 and a second transmission shaft 22 , and the axis centers of the first transmission shaft 21 and the second transmission shaft 22 coincide. A first bearing 23 is installed in the first bearing hole 111 of the main housing, and the first transmission shaft 21 is supported on the main housing 11 through the first bearing 23 , and one end thereof extends out of the main housing 11 . A second bearing 24 is installed in the second bearing hole 121 at the center of the bevel gear end cover 12 . As shown in FIG. 1 and FIG. 6 , the end of the first transmission shaft opposite to the second transmission shaft 22 is provided with a disk-shaped shoulder 211 , and there is a rotation gap between it and the main housing 11 . The center of the shaft shoulder 211 is provided with a third bearing hole 2111 for installing the third bearing, and the third bearing hole 2111 is equipped with the third bearing 25 . A plurality of cylindrical pin holes 2112 are provided on the side opposite to the second transmission shaft 22 on the shoulder near the edge of the shoulder 211 for the insertion and disengagement of the toggle member 50. The diameter of the pin holes 2112 is larger than the above-mentioned Diameter of toggle member 50 . The pin hole 2112 can also be a conical pin hole. The diameter of the second transmission shaft 22 is smaller than that of the first transmission shaft 21 , and it is coaxially installed on the other end of the first transmission shaft 21 . A second bearing hole 121 is provided at the center of the bevel gear end cover 12 , and a second bearing 24 is housed in the second bearing hole 121 . A third bearing hole 2111 is provided at the center of the shaft shoulder 211, and a third bearing 25 is installed in the third bearing hole 2111. The second transmission shaft 22 is supported on the bevel end cover 12 and the first transmission shaft 21 through the second bearing 24 and the third bearing 25 , and one end of the second transmission shaft 22 protrudes outside the bevel end cover 12 . In this embodiment, the second transmission shaft 22 may be connected to a rotating drive device such as a motor or a pulley.

As shown in Fig. 1, Fig. 4A and Fig. 4B, a skew wheel 30 is fixed in the middle of the second transmission shaft 22, and the center of the skew wheel 30 is provided with a shaft hole 34, and the skew wheel 30 passes through the shaft hole 34 Sleeved and fixed on the second transmission shaft 22 . The skewed wheel 30 is arranged obliquely, and the centerline of its outer peripheral surface is inclined and intersects the central axes of the first transmission shaft 21 and the second transmission shaft 22. The centerline L2 of the skewed wheel 30 is in line with the first transmission shaft. The intersection point of the central axis L1 of the shaft 21 and the second transmission shaft 22 is located at the intersection point of the bevel tooth end cover 12 and the bevel tooth index line L3 of the bevel tooth balance wheel 40 . A protruding step 31 is provided on one end edge of the skew wheel 30 for restricting the axial movement of the fourth bearing 26 . A snap ring groove 33 for installing a snap ring 32 is provided on the outer peripheral surface of the other end of the skew wheel 30 .

As shown in Fig. 1, Fig. 5A and Fig. 5B, a bevel tooth balance wheel 40 is fixed on the skew wheel 30, and the center of the bevel tooth balance wheel 40 is provided with a fourth bearing hole 41, and the bevel tooth balance wheel 40 and The opposite side of the bevel gear cover 12 is provided with bevel teeth along the circumference, and the bevel gear balance 40 is provided with a protruding step 42 on the edge of the end close to the bevel gear, which is used to limit the axial movement of the fourth bearing 26 . A snap ring groove 43 for installing the snap ring 32 is provided on the outer peripheral surface of the other end of the bevel tooth balance wheel 40 . The fourth bearing 26 is installed in the fourth bearing hole 41 of the bevel tooth balance wheel 40, and the elastic snap ring 32 is installed on the fourth bearing 26. The snap ring 32 is embedded in the snap ring groove 33 of the bevel wheel 30 and the bevel tooth pendulum In the snap ring groove 43 of the wheel 40, the two ends of the fourth bearing 26 are respectively fixed by the snap ring 32, the step 31 on the skew wheel 30, and the step 42 on the bevel tooth balance wheel 40, and the bevel tooth pendulum The wheel 40 is fixed on the skew wheel 30 through the fourth bearing 26. As shown in FIG. The index lines of the bevel teeth of the cover 12 intersect at one point.

As shown in Figure 1, the other side of the bevel tooth balance wheel 40 is provided with a plurality of dials 50 near the edge, and the dials 50 can be dial pins, dial teeth or dial keys. The pin, shift tooth or dial key can be fixed in the hole on the bevel balance 40 , and can also be integrally formed on the side surface of the bevel balance 40 . In this embodiment, the driving member 50 is a dial pin, and the end of the dial pin in contact with the pin hole 2112 on the shoulder 211 of the first transmission shaft is cylindrical or conical. Correspondingly, the groove or hole 2112 on the shoulder of the first transmission shaft can be a pin hole, or a tooth groove or a keyway, and the size of the pin hole, tooth groove or keyway is larger than that of the dial pin, dial The size of the tooth or toggle key is such that the toggle member 50 can freely enter the pin hole, tooth groove or keyway, and disengage from the pin hole, tooth groove or keyway after the toggle action is completed, so that the toggle member 50 can freely enter and Disengaged activity fit.

In the present utility model, the tooth number difference between the bevel tooth balance wheel 40 and the bevel tooth end cover 12 and the gear ratio of the bevel tooth end cover 12 constitute the transmission ratio of the speed change mechanism, which determines that by changing the bevel tooth balance wheel 40 and the bevel tooth end cover 12 The gear ratio of the speed change device can be changed by the ratio of the tooth number difference between the bevel tooth end cover 12 and the bevel tooth end cover 12. Obviously, the more teeth of the bevel gear balance wheel 40 and the bevel tooth end cover 12 and the smaller the tooth number difference, The larger the transmission ratio, the transmission ratio of the transmission device can be effectively changed by increasing the number of teeth of the bevel gear balance wheel 40 and the bevel gear end cover 12 and reducing the difference between the two, thereby realizing single-stage large-scale speed change.

The working principle of the utility model is shown in Figure 1, when the second drive shaft 22 drives the skew wheel 30 to rotate, it drives the bevel gear balance wheel 40 to engage and roll on the bevel teeth of the bevel gear end cover 12, A compound motion of conical swing and rotation is formed. Every time the second transmission shaft 22 rotates one revolution, the bevel tooth balance 40 meshes with the bevel teeth of the bevel tooth end cover 12 once. At the same time, the dial on the other side of the bevel tooth balance 40 The moving part 50 rotates the first transmission shaft 21 through the groove or the hole 2112 on the shoulder of the first transmission shaft, and transmits the increased or decelerated power to the first transmission shaft 21 . The tooth number difference between the bevel gear balance wheel 40 and the bevel gear end cap 12 and the gear ratio of the bevel gear end cap 12 constitute the transmission ratio of the speed change mechanism, realizing a single-stage large-ratio speed change.

Example 2

In this embodiment, the basic structure of the bevel gear swing transmission device of the present invention is the same as that in Embodiment 1. As shown in FIGS. 7 to 9 , the bevel gear oscillating speed change device includes a body 10 , a transmission shaft 20 , a skew wheel 30 , a bevel gear balance 40 and a dial 50 .

As shown in FIG. 1 and FIG. 8A and FIG. 8B , the body 10 includes a main casing 11 and an end cover 70 , wherein the structure of the main casing 11 is the same as that of the first embodiment. The end cover 70 is a circular plate-shaped body, the center of which is provided with a second bearing hole 71, and the end cover 70 is provided with a plurality of cylindrical pin holes 72 near the edge for inserting the toggle member 50. The pin holes The diameter of 72 is greater than the diameter of described toggle member 50, so that toggle member 50 can freely enter the pin hole, and disengage from pin hole 72 after the toggle action is completed, forming the toggle member 50 that can freely enter and disengage. Activity coordination. The structures of the skew wheel 30 and the bevel balance wheel 40 are the same as in the first embodiment.

As shown in Fig. 7 and Fig. 9, the transmission shaft 20 includes a first transmission shaft 21 and a second transmission shaft 22, the axes of the first transmission shaft 21 and the second transmission shaft 22 coincide, and on the first transmission shaft 21 A shaft shoulder 211 is provided, and one side of the shaft shoulder 211 is provided with conical gears. The first transmission shaft 21 is supported on the main housing 11 through the first bearing 23, and the second transmission shaft 22 passes through the second bearing 24 and the third bearing. 25 is supported on the end cover 70 and the first transmission shaft 21. The plurality of toggle pieces 50 are fixed on the opposite side of the bevel tooth balance wheel 40 and its bevel teeth.

In this embodiment, the gear ratio of the speed change mechanism is constituted by the gear ratio between the bevel gear balance 40 and the bevel teeth of the first transmission shaft 21 and the gear ratio of the bevel gear balance 40 .

The working principle of the present utility model is shown in Figure 7, when the second transmission shaft 22 drives the skew wheel 30 to rotate, it drives the bevel gear balance wheel 40 to perform conical swing, and through it and the first transmission shaft 21 The meshing of the conical teeth on the shoulder drives the first transmission shaft 21 to rotate. At the same time, the driving member 50 provided on the other side of the bevel tooth balance 40 is inserted into or disengaged from the pin hole 72 on the end cover 70 , so that the insertion of the driving member 50 prevents the bevel tooth balance 40 from rotating.

In the first and second embodiments, the setting positions of the toggle member 50 and the slots or holes 2112 and 72 for inserting the toggle member 50 can be interchanged.

Although the utility model has been disclosed through the above embodiments, the scope of protection of the utility model is not limited thereto. Under the condition of not departing from the concept of the utility model, the deformation and replacement of the above components will fall into place. Into the scope of claims of the present utility model.

Claims (13)

1. bore tooth and swing a speed change gear, it is characterized in that, this device comprises:

Body (10), it comprises main casing (11) and cone increment lid (12), and the side of described cone increment lid (12) is provided with circular cone tooth;

Transmission shaft (20), it comprises the first transmission shaft (21) and second driving shaft (22), the axis coinciding of this first transmission shaft (21) and second driving shaft (22), first transmission shaft (21) is supported on main casing (11) by clutch shaft bearing (23), and second driving shaft (22) is supported on cone increment lid (12) and the first transmission shaft (21) by the second bearing (24), the 3rd bearing (25);

Tiltedly partially take turns (30), it is fixed on second driving shaft (22);

Cone tooth escapement (40), it is fixed on described tiltedly inclined wheel (30) by the 4th bearing (26), and described cone tooth escapement (40) is meshed with described cone increment lid (12);

Described cone tooth escapement (40) forms the velocity ratio of this gear with the number of teeth difference of cone increment lid (12) and the gear ratio of cone increment lid (12);

Multiple shifting part (50), it is located at described cone tooth escapement (40) one side contrary with its cone tooth; And

When described second driving shaft (22) drives tiltedly wheel (30) rotation partially, described cone tooth escapement is driven to make engagement rolling on the cone tooth of cone increment lid (12), form circular cone to swing and the compound motion rotated, and rotated and drive described first transmission shaft (21) to rotate through described shifting part (50).

2. cone tooth as claimed in claim 1 swings speed change gear, it is characterized in that, the shaft shoulder (211) is provided with in one end of described first transmission shaft (21), the center of this shaft shoulder (211) is provided with the 3rd bearing hole (2111) of installing the 3rd bearing, multiple groove of inserting for shifting part (50) or hole (2112) are being provided with near the edge of the shaft shoulder (211), the diameter of this groove or hole (2112) is greater than the diameter of described shifting part (60), forms the activity cooperation that shifting part (50) can enter and throw off.

3. cone tooth as claimed in claim 1 swings speed change gear, it is characterized in that, described cone increment lid (12) is tabular body, and its center is provided with the second bearing hole (121), and its side relative with described main casing (11) is provided with circular cone tooth.

4. cone tooth as claimed in claim 1 swings speed change gear, it is characterized in that, described tiltedly inclined wheel (30) is fixed on the middle part of described second driving shaft (22) by its axis hole, tiltedly partially the outer peripheral surface of wheel (30) centerline dip and intersect at the central axis of the first transmission shaft (21) and second driving shaft (22), described intersection point of tiltedly partially taking turns the center line of (30) and the central axis of described first transmission shaft (21) and second driving shaft (22) is positioned at the intersection point of the cone tooth reticule of described cone increment lid (12) and cone tooth escapement (40).

5. cone tooth as claimed in claim 4 swings speed change gear, it is characterized in that, the center of described cone tooth escapement (40) is provided with the 4th bearing hole (41), the side that cone tooth escapement (40) is relative with described cone increment lid (12) is provided with circular cone tooth, described cone tooth escapement (40) intersects at a point with the cone tooth reticule of cone increment lid (12), the opposite side proximal edge place of cone tooth escapement (40) is provided with multiple shifting part (50), and described cone increment lid (12) intersects at a point with the cone tooth reticule of cone tooth escapement (40).

6. cone tooth as claimed in claim 5 swings speed change gear, it is characterized in that, described shifting part (50) is finger, moving tooth or dial key, described finger, moving tooth or group key are fixed in the hole on cone tooth escapement (40) or are integrally formed at the side surface of cone tooth escapement (40), correspond, groove on the shaft shoulder of described first transmission shaft or hole (2112) are respectively pin-and-hole, teeth groove or keyway, and the size of this pin-and-hole, teeth groove or keyway is greater than described finger, moving tooth or dials the size of key.

7. bore tooth and swing a speed change gear, it is characterized in that, this device comprises:

Body (10), it comprises main casing (11) and end cap (70);

Transmission shaft (20), it comprises the first transmission shaft (21) and second driving shaft (22), the axis coinciding of this first transmission shaft (21) and second driving shaft (22), first transmission shaft (21) is provided with the shaft shoulder (211), the side of the shaft shoulder (211) is provided with circular cone tooth, this first transmission shaft (21) is supported on main casing (11) by clutch shaft bearing (23), and second driving shaft (22) is supported on end cap (70) and the first transmission shaft (21) by the second bearing (24), the 3rd bearing (25);

Tiltedly partially take turns (30), it is fixed on second driving shaft (22);

Cone tooth escapement (40), it is fixed on described tiltedly inclined wheel (30) by the 4th bearing (26), and described cone tooth escapement (40) is meshed with described first transmission shaft (21) circular cone tooth;

Number of teeth difference and cone tooth escapement (40) gear ratio of described cone tooth escapement (40) and the first transmission shaft (21) circular cone tooth form the velocity ratio of this gear;

Multiple shifting part (50), it is located at described cone tooth escapement (40) one side contrary with its cone tooth; And

When described second driving shaft (22) drives tiltedly wheel (30) rotation partially, drive described cone tooth escapement (40) to make circular cone to swing, and drive the first transmission shaft (21) to rotate by it with engaging of the first transmission shaft (21) circular cone tooth.

8. cone tooth as claimed in claim 7 swings speed change gear, it is characterized in that, is provided with the 3rd bearing hole (2111) of installing the 3rd bearing at the center of the shaft shoulder (211) of described first transmission shaft.

9. cone tooth as claimed in claim 7 swings speed change gear, it is characterized in that, the center of end cap (70) is provided with the second bearing hole (71), end cap (70) keeps to the side, and it is multiple for shifting part (50) groove that inserts or hole (72) to be provided with, and the diameter of this groove or hole (72) is greater than the diameter of described shifting part (50).

10. cone tooth as claimed in claim 7 swings speed change gear, it is characterized in that, described tiltedly inclined wheel (30) is fixed on the middle part of described second driving shaft (22) by its axis hole, tiltedly partially the outer peripheral surface of wheel (30) centerline dip and intersect at the central axis of the first transmission shaft (21) and second driving shaft (22), described intersection point of tiltedly partially taking turns the center line of (30) and the central axis of described first transmission shaft (21) and second driving shaft (22) is positioned at the intersection point of the cone tooth reticule of described cone tooth escapement (40) and the first transmission shaft (21) circular cone tooth.

11. bore tooth as claimed in claim 10 swings speed change gear, it is characterized in that, the center of described cone tooth escapement (40) is provided with the 4th bearing hole (41), the side that cone tooth escapement (40) is relative with the shaft shoulder (211) of described first transmission shaft is provided with circular cone tooth, described cone tooth escapement (40) intersects at a point with the cone tooth reticule of the circular cone tooth of the shaft shoulder (211) of the first transmission shaft, the opposite side proximal edge place of cone tooth escapement (40) is provided with multiple axial shifting part (50), described cone tooth escapement (40) intersects at a point with the cone tooth reticule of the circular cone tooth of the shaft shoulder (211) of the first transmission shaft.

12. cone teeth as described in claim 2 or 9 swing speed change gear, it is characterized in that, described shifting part (50) is finger, moving tooth or dial key, described finger, moving tooth or group key are fixed in the hole on cone tooth escapement (40) or are integrally formed at the side surface of cone tooth escapement (40), correspond, groove on described end cap or hole (72) are respectively pin-and-hole, teeth groove or keyway, and the size of this pin-and-hole, teeth groove or keyway is greater than described finger, moving tooth or dials the size of key.

13. cone teeth as described in claim 2 or 9 swing speed change gear, it is characterized in that, described shifting part (50) can exchange with the setting position of the groove inserted for shifting part (50) or hole (2112,72).