CN218845000U - Transmission device - Google Patents

Abstract

The application provides a transmission, wherein, transmission includes: the speed change mechanism comprises at least two transmission shafts and a speed change assembly, and the two transmission shafts are respectively in transmission connection with the speed change assembly; the extension piece is connected with at least one transmission shaft; the interior of the transmission shaft connected with the extension piece is formed with a connecting hole, a part of the extension piece is inserted into the connecting hole, and the extension piece is fixedly connected with the transmission shaft. The application discloses transmission can reduce the stress of junction between extension and the input shaft to improve transmission precision.

Description

Transmission device

Technical Field

The application relates to the technical field of mechanical transmission, in particular to a transmission device.

Background

The transmission is a mechanical structure commonly used in most mechanical devices. The transmission device mainly comprises an input shaft, a speed change component and an output shaft which are connected. In some usage environments, in order to increase the transmission distance of the output shaft in the axial direction thereof, an extension member (e.g., a lead screw) is disposed to be connected to the output shaft, and one end of the extension member is usually fixedly connected to one end of the output shaft, so as to ensure that the output shaft drives the extension member to rotate synchronously.

However, it has been found that during use, the connection between the extension member and the input shaft is typically subjected to significant stresses which can cause deformation of the extension member and/or the input shaft and affect the accuracy of the transmission.

SUMMERY OF THE UTILITY MODEL

The transmission device provided by the embodiment of the application can reduce the stress at the joint between the extension piece and the input shaft and improve the transmission precision.

The embodiment of the application provides a transmission device, wherein, transmission device includes: the speed change mechanism comprises two transmission shafts and a speed change assembly, and the two transmission shafts are respectively in transmission connection with the speed change assembly; the extension piece is connected with at least one transmission shaft; a connection hole is formed inside the transmission shaft to which the extension member is connected, a portion of the extension member is inserted into the connection hole, and the extension member is fixedly connected with the transmission shaft.

The transmission device comprises a transmission shaft, a connecting hole, a connecting rod and a connecting rod, wherein the connecting hole is a through hole which penetrates through the transmission shaft in the axial direction of the transmission shaft, and one end face of the extension piece is flush with one end face of the transmission shaft; the transmission device further comprises a positioning piece which is respectively connected with one end face of the transmission shaft and one end face of the extension piece in a positioning mode.

The transmission device as described above, wherein the speed changing assembly includes at least two gears, each of the transmission shafts is fixedly provided with one of the gears, and the gears are in transmission connection.

The transmission device further comprises a box body, the box body is provided with two opposite first wall parts, and two ends of each transmission shaft are rotatably connected with the two first wall parts through bearings respectively.

The transmission device as described above, wherein the first wall portion has a through hole, the bearing is installed in the corresponding through hole, one side of the bearing away from the corresponding gear is provided with a plurality of blocking pieces, the plurality of blocking pieces are arranged at intervals along the circumferential direction of the bearing, the blocking pieces are connected with the first wall portion, and the blocking pieces are abutted against the corresponding bearing.

The transmission device is characterized in that a separating ring sheet is arranged between each gear and each corresponding two bearings, and the separating ring sheets are sleeved on the transmission shaft.

The transmission device as described above, wherein a limiting member is disposed on a side of the bearing away from the gear, the limiting member is connected to the corresponding transmission shaft, and at least a portion of the limiting member protrudes from an outer circumferential surface of the transmission shaft.

The transmission device as described above, wherein the speed changing assembly further includes at least one transition transmission shaft, two ends of the transition transmission shaft are respectively rotatably connected to the two first wall portions, a transition gear is disposed on the transition transmission shaft, and the transition gear is connected between the two gears in a transmission manner.

The transmission device as described above, wherein the transmission shaft includes a first transmission shaft and a second transmission shaft, the speed change mechanism includes a first gear and a second gear, the first gear is mounted on the first transmission shaft, the second gear is mounted on the second transmission shaft, and the first gear is in transmission connection with the second gear; the first transmission shaft is connected with the driver, and the second transmission shaft is connected with the extension piece.

The transmission device as described above, wherein a mounting seat is disposed at an end portion of the first transmission shaft connected to the driver, the mounting seat is detachably connected to the box body, and a through hole is formed at a position of the mounting seat opposite to the first transmission shaft.

The embodiment of the application provides a transmission includes speed change mechanism and extension, speed change mechanism includes two transmission shafts and speed change unit, two transmission shafts pass through the transmission of speed change unit and connect, the connecting hole is seted up through the transmission shaft that connects the extension in needs, make the extension insert in the connecting hole meet with the transmission shaft is fixed, the extension inserts the outer peripheral face of the part to the connecting hole and the pore wall laminating contact of connecting hole, compare in the technical scheme that the tip of lead screw and the tip of output shaft meet among the prior art, can effectively increase the area of contact between extension and the transmission shaft, make the effort homogeneous action that produces between extension and the transmission shaft on the area of contact between the two, reduce the stress that the unit area on the area of contact received between extension and the transmission shaft, thereby reduce the deformation of extension and transmission shaft, the transmission precision of extension and transmission shaft has been guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a partial schematic view in section of a transmission provided in an embodiment of the present application;

FIG. 2 is an isometric view of a transmission provided by an embodiment of the present application;

FIG. 3 is a top view of a transmission provided in accordance with an embodiment of the present application;

FIG. 4 is a side view of a transmission provided in accordance with an embodiment of the present application;

FIG. 5 is a front view of a transmission provided by an embodiment of the present application;

fig. 6 is a rear view of a transmission provided in an embodiment of the present application.

Detailed Description

Features of various aspects and exemplary embodiments of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of, and not restrictive on, the present application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.

In the design process of the transmission structure, the structure complexity, noise, volume, cost and reliability are the most important design indexes.

Common transmission structures include standardized products including planetary, worm and gear, parallel shaft, and the like, and non-standard design products including gear, chain, belt, and the like. Adopt standardized transmission often can receive the restriction in space in drive arrangement, if use the planetary gear that directly links to occupy length space, use right angle planetary gear machine or worm gear drive machine can occupy width space, if through the arrangement mode that changes such standardized product with reducing space occupancy, have a lot of limitations such as size and reduction ratio.

In order to reduce the space occupation rate, gears with smaller volume are generally adopted for transmission. At present, most of gear transmission speed reducing devices applied to parallel transmission are designed in such a way that a pinion is directly fixed on an output shaft of a driving motor, or the pinion is fixed on an output shaft of a planetary speed reducer, and a gearwheel is fixed on a driven device. However, the center distance between the large gear and the small gear needs to be adjusted when assembling, and the center distance may change in the running process of the device, which is easy to generate the problems of large noise and excessive gear wear; and the big gear and the small gear are both cantilever-mounted, so that the problem of excessive wear of the gears and even shaft breakage is easily caused.

In addition, in order to realize the remote transmission connection between the device to be driven and the gear, in the field of mechanical transmission, a lead screw is usually adopted to connect the two. The common screw rod connection modes include two, wherein one mode is that the screw rod is directly connected with a transmission machine; the other type of the standard transmission is a right-angle transmission and is matched with a coupler to be connected with a lead screw. However, the space requirement of mechanical equipment is often strict, and if a direct-connected driving machine is used, the space in the length direction is occupied, and a right-angle driving machine is used, the space in the width direction is occupied. Compared with the two screw connection modes, the optimal solution is to arrange a power unit (such as a servo motor) and a screw in parallel. The parallel shaft transmission machine can be adopted for realizing the scheme, but because the parallel shaft transmission machine forms a standardized series, the parallel shaft transmission machine has a plurality of limitations such as size, reduction ratio and the like when in selection, and at the moment, a non-standard design scheme is required to be adopted. In the non-standard design scheme of the parallel shaft transmission machine, the chain transmission, the belt transmission and the like occupy larger space, so the gear transmission which occupies smaller space is often the best choice.

At present, when a transmission structure with a lead screw is arranged, a pinion is directly and fixedly connected to an output shaft of a motor, or the motor is connected with a standard planetary reducer, the pinion is fixedly connected to an output shaft of the planetary reducer, and a gearwheel is directly fixed to the lead screw.

However, the problem with this solution is that the center distance between the large gear and the small gear needs to be adjusted during assembly, which makes assembly difficult, and the center distance between the large gear and the small gear may change during transmission, which is likely to cause problems of excessive noise and excessive wear of the gears.

To solve the above-mentioned problems of the related art, embodiments of the present application provide a transmission device. The transmission provided by the embodiments of the present application will be described in detail below.

As shown in fig. 1, an embodiment of the present application provides a transmission, wherein the transmission includes: the speed change mechanism 10 comprises two transmission shafts 11 and a speed change component 12, wherein the two transmission shafts 11 are respectively connected with the speed change component 12 in a transmission way; an extension member 20, at least one transmission shaft 11 is connected with the extension member 20; the interior of the driving shaft 11 to which the extension piece 20 is coupled is formed with a coupling hole 13, a portion of the extension piece 20 is inserted into the coupling hole 13, and the extension piece 20 is fixedly coupled to the driving shaft 11.

One transmission shaft 11 of the two transmission shafts 11 of the speed change mechanism 10 of the embodiment of the present application is an input shaft, and the other transmission shaft is an output shaft; the driving rotation speed is transmitted in through the input shaft, and the driving rotation speed is transmitted to the output shaft after the variable speed of the variable speed assembly 12, and the input shaft and the output shaft can both be connected with the extension piece 20, and the extension piece 20 rotates along with the input shaft or the output shaft synchronously, and the transmission device can realize the transmission distance along the axial direction of the transmission shaft 20 by arranging the extension piece 20.

Compared with the technical scheme that the end part of the lead screw is connected with the end part of the output shaft in the prior art, the extension piece 20 can effectively increase the contact area between the extension piece 20 and the transmission shaft 11, so that the acting force generated between the extension piece 20 and the transmission shaft 11 is uniformly applied to the contact area between the extension piece 20 and the transmission shaft 11, the stress received by the unit area of the contact area between the extension piece 20 and the transmission shaft 11 is reduced, the deformation of the extension piece 20 and the transmission shaft 11 is reduced, and the transmission accuracy of the extension piece 20 and the transmission shaft 11 is ensured.

Specifically, extension 20 is the lead screw, and transmission shaft 11 is rotatory and drives the lead screw and take place to rotate, can connect the movable block soon on the lead screw, rotates the in-process at the lead screw structure, makes the movable block along the axial reciprocating motion of lead screw to convert the rotation into rectilinear movement, realize the conversion of motion mode.

The end of the screw rod is formed with a smooth connecting section which extends into the connecting hole 13 to be connected with the transmission shaft 11. A key or other circumferential positioning pieces are arranged between the connecting section and the connecting hole 13 to realize the positioning connection of the screw rod and the transmission shaft 11, so that the screw rod and the transmission shaft 11 are kept circumferentially static to synchronously rotate along with the transmission shaft 11.

Optionally, the connecting section is of a prism structure, the connecting hole 13 is a polygonal hole, and the radial cross section of the connecting section and the radial cross section of the connecting hole 13 are the same in shape and size, so that the connecting section and the connecting hole can rotate synchronously after being plugged.

As shown in fig. 1, 4 and 6, the transmission device according to the embodiment of the present application is provided, wherein the connection hole 13 is a through hole penetrating in an axial direction of the transmission shaft 11, and an end surface of one end of the extension member 20 is flush with an end surface of one end of the transmission shaft 11; the transmission device further comprises a positioning member 30, and the positioning member 30 is respectively connected with one end face of the transmission shaft 11 and one end face of the extension member 20 in a positioning manner.

The end face of one end of the extension piece 20, which is connected with the connecting hole 13, is flush with the end face of one end of the transmission shaft 11, so that the positioning standard is provided between the extension piece 20 and the transmission shaft 11, and in the assembling process of the transmission device, whether the end face of one end of the extension piece 20, which is inserted into the connecting hole 13, is flush with the end face of one end of the transmission shaft 11 or not can be judged, so that whether the extension piece 20 is assembled in place or not can be judged.

The positioning piece 30 is respectively connected with the extension piece 20 and the transmission shaft 11 in a positioning mode, so that the relative positions of the extension piece 20 and the transmission shaft 11 can be fixed, the extension piece 20 cannot axially move in the connecting hole 13, and the connecting stability between the extension piece 20 and the connecting hole 13 is ensured.

Specifically, setting element 30 includes locating plate and positioning bolt, the locating plate respectively with the one end terminal surface of extension 20 and the one end terminal surface looks butt of transmission shaft 11 that the parallel and level set up, the through-hole has been seted up on the locating plate, positioning bolt's screw rod part run through the through-hole and with extension 20 threaded connection, positioning bolt's bolt head and locating plate looks butt, make the locating plate and the inseparable butt of the one end terminal surface of extension 20 and transmission shaft 11, the terminal surface that makes extension 20 and transmission shaft 11 looks parallel and level can keep the state of parallel and level, connection stability has been strengthened.

Optionally, the axis of the positioning bolt coincides with the axis of the extension 20 and the axis of the transmission shaft to ensure that the positioning bolt is evenly stressed during the rotation of the extension 20 and the transmission shaft 11.

Optionally, a plurality of through holes may be formed in the positioning plate, and a plurality of positioning bolts may be correspondingly disposed in the plurality of through holes, so that the connection between the positioning plate and the extension piece 20 is more stable, and the connection stability between the extension piece 20 and the connection hole 13 is further improved.

Optionally, the positioning plate may be welded and fixed to one end of the transmission shaft; or a plurality of positioning screws are arranged, so that the positioning screws penetrate through the positioning plate and are connected with the transmission shaft, and the positioning connection between the positioning plate and the transmission shaft 11 is realized.

As shown in fig. 1, the transmission device according to the embodiment of the present application is provided, wherein the speed changing assembly 12 includes at least two gears 14, one gear 14 is fixedly mounted on each transmission shaft 11, and the gears 14 are in transmission connection.

A key or other circumferential positioning member is provided between each gear 14 and the corresponding drive shaft 11 to ensure that the gears 14 and the drive shafts 11 rotate synchronously.

One transmission shaft 11 (input shaft) of the speed change mechanism 10 rotates to drive the corresponding gear 14 mounted thereon to rotate and to drive the gear 14 mounted on the other transmission shaft 11 (output shaft) and the transmission shaft 11 to rotate, which are engaged therewith.

Alternatively, the transmission assembly 12 has only two gears 14, and the two gears 14 are directly meshed to realize the transmission between the two transmission shafts 11. The speed change, including acceleration and deceleration, is achieved by adjusting the radial dimensions and number of teeth of the two gears 14.

Alternatively, the radial dimensions and the number of teeth of the two gears 14 can be equal to realize a uniform transmission.

Optionally, the speed change assembly 12 further comprises at least one transition transmission shaft in addition to the two gears 14 connected to the two transmission shafts 11, the transition transmission shaft is provided with a transition gear, and the transition gear is engaged between the two gears 14. Transition transmission shaft and transition gear can be equipped with a plurality ofly, and each transition gear's radial dimension and number of teeth all can be the same or different to realize multistage variable speed, further promoted speed control's effect.

In the transmission provided in other embodiments of the present application, the speed change mechanism 10 further includes at least one transition transmission shaft, a transition gear is disposed on the transition transmission shaft, and the transition gear is in transmission connection between the first gear 141 and the second gear 142. In the case of using two transmission shafts 11 and two gears 14 in cooperation, the transmission requirement between the driver 50 and the extension 20 still cannot be satisfied, and a transition transmission shaft and a transition gear are added between the two transmission shafts 11 and the two gears 14 to perform multi-stage rotation speed transmission so as to satisfy the rotation speed requirement of the extension 20.

Optionally, the radial dimensions and the number of teeth of the two gears 14 and the transition gears are different, and during the transmission process, the angular velocity of each gear 14 is different, so as to realize the variable speed transmission between the two gears 14 and each transition gear, and thus realize the variable speed transmission between the two transmission shafts 11.

Alternatively, the gear 14 may be a straight gear or a helical gear, and both gears have good transmission effects.

Preferably, the gear 14 is a spur gear which is convenient to process, and in the transmission process, the spur gear is subjected to small axial stress along the spur gear in the transmission process, so that the axial relative acting force between the gear 14 and the transmission shaft 11 can be reduced, the deformation of the gear 14 and the transmission shaft 11 is reduced, and the transmission precision is ensured.

As shown in fig. 1, the transmission device according to the embodiment of the present application further includes a case 40, the case 40 has two opposite first wall portions 41, two opposite second wall portions 42 and a bottom plate, the two first wall portions 41 and the two second wall portions 42 enclose to form a frame structure and are mounted on the bottom plate to form the case 40 with an open top, and the two transmission shafts 11 and the transmission assembly 12 are mounted inside the case 40. The two transmission shafts 11 and the transmission assembly 12 are protected by the box body 40, so that the normal operation of the two transmission shafts 11 and the transmission assembly 12 is ensured, and meanwhile, the transmission assembly 12 is prevented from being exposed to be easily contacted with and hurt a worker.

Both ends of each transmission shaft 11 are rotatably connected to the first wall portions 41 through bearings 15.

The first wall portion 41 is provided with a hole structure, the bearing 15 is installed in the hole structure, and an outer ring of the bearing 15 and an inner wall of the hole structure are kept relatively static; the inner ring of the bearing 15 is sleeved on the outer peripheral surface of the end part of the transmission shaft 11, and the inner ring of the bearing 15 and the transmission shaft 11 keep relatively static. Specifically, the outer ring of the bearing 15 is connected with the inner wall of the hole structure in an interference fit manner, and the inner ring of the bearing 15 is connected with the corresponding transmission shaft 11 in an interference fit manner.

The hole structure may be a blind hole recessed on the inner surface of the first wall portion 41 or a through hole penetrating the first wall portion 41.

Both ends at every transmission shaft 11 all set up bearing 15, can provide holding power for it at the both ends of transmission shaft 11 to make transmission shaft 11 atress in the rotation process even, reduce transmission shaft 11 because the atress is uneven and lead to local stress too big, the condition that appears broken axle or excessive wear.

Optionally, a lubricating medium is injected into the box 40, at least a part of the transmission assembly 12 is immersed in the lubricating medium, and the transmission assembly 12 is lubricated by the lubricating medium, so that friction force between components of the transmission assembly in a transmission process is reduced, the wear rate of the transmission assembly is reduced, and the service life of the transmission assembly is prolonged.

As shown in fig. 2 and 3, a cover plate 43 is disposed on the top of the casing 40, the cover plate 43 is a transparent organic glass plate or plastic plate, and an operator can observe the working conditions of the transmission shaft 11 and the transmission assembly 12 inside the casing 40 through the transparent cover plate 43, and check whether the lubricating medium in the casing is sufficient and the wear condition of the transmission assembly in real time, so as to replace the wear parts of the transmission assembly 12 even if the lubricating medium is replenished.

The cover plate 43 is detachably connected with the box body 40 and seals the top opening of the box body 40, and when each part in the box body 40 is damaged, the cover plate 43 can be timely detached to maintain and replace the part in the box body 40.

Alternatively, as shown in fig. 1, in the transmission device provided in the embodiment of the present application, the hole structure is a through hole 44, the bearing 15 is installed in the corresponding through hole 44, a plurality of blocking pieces 16 are disposed on a side of the bearing 15 away from the corresponding gear 14, the plurality of blocking pieces 16 are disposed at intervals along a circumferential direction of the bearing 15, each blocking piece 16 is connected to the first wall portion 41, and a portion of the blocking piece 16 abuts against a side of the corresponding bearing 15 away from the gear 14.

The bearing 15 can be axially limited by arranging the baffle 16, when the bearing 15 receives an axial force towards the outside of the box body 40, the baffle 16 blocks the bearing 15 to prevent the bearing 15 from moving towards the outside of the box body 40 along the axial direction, so that the axial positions of the bearing 15, the transmission shaft and the gear are maintained; the bearing 15 is limited by the blocking pieces 16, and compared with an integral annular blocking ring, the integral size of the blocking pieces 16 is smaller, so that the whole weight of the transmission device is lighter, the processing is simpler and more convenient, and the cost is lower.

As shown in fig. 1, in the transmission device provided in the embodiment of the present application, a separating ring 17 is disposed between each gear 14 and each of the two corresponding bearings 15, and the separating ring 17 is sleeved on the transmission shaft 11. The separating ring sheet 17 has the effect of separating the gear 14 and the two bearings 15, so that direct friction between the gear 14 and the two bearings 15 is avoided, the loss of the gear 14 and the bearings 15 is reduced, and the service life is prolonged.

As shown in fig. 1, in the transmission device provided in the embodiment of the present application, a limiting member 18 is disposed on a side of the bearing 15 away from the gear 14, the limiting member 18 is connected to the corresponding transmission shaft 11, and at least a portion of the limiting member 18 protrudes out of an outer peripheral surface of the transmission shaft 11. The part of the limiting member 18 protruding out of the outer circumferential surface of the transmission shaft 11 abuts against one side of the bearing 15 away from the gear 14, and the limiting member 18 limits the relative position between the bearing 15 and the transmission shaft 11 along the axial direction of the transmission shaft 11, so that the bearing 15 is prevented from being separated from the transmission shaft 11 by the end part of the transmission shaft 11.

Optionally, the limiting part 18 is a snap spring, the transmission shaft 11 has a limiting groove adapted to the snap spring, in the use process of the snap spring, the snap spring is installed in the limiting groove of the transmission shaft 11, the relative position between the transmission shaft 11 and the snap spring is maintained through the limiting groove, and a part of the snap spring protrudes out of the transmission shaft 11, and the protruding part abuts against one side, far away from the gear 14, of the bearing 15, so that the bearing 15 can be axially limited.

Exemplarily, as shown in fig. 1 and fig. 5, the transmission device provided in the embodiment of the present application, wherein the transmission shaft 11 includes a first transmission shaft 111 and a second transmission shaft 112, the transmission mechanism 10 includes a first gear 141 and a second gear 142, the first gear 141 is mounted on the first transmission shaft 111, the second gear 142 is mounted on the second transmission shaft 112, and the first gear 141 is in transmission connection with the second gear 142; a first drive shaft 111 is connected to the drive 50 and a second drive shaft 112 is connected to the elongate member 20.

The driver 50 drives the first transmission shaft 111 to rotate, the first transmission shaft 111 drives the first gear 141 to rotate, the rotation of the first gear 141 drives the second gear 142 to rotate, the rotation of the second gear 142 drives the second transmission shaft 112 to rotate, and finally the extension piece 20 connected with the second transmission shaft 112 has an output rotation speed, so that the variable speed transmission of the whole device is realized. The transmission device of the embodiment of the application only comprises the two transmission shafts 11, the two gears 14 and the extension piece 20, has a very simple structure, can effectively reduce the manufacturing cost of the transmission device, and is beneficial to the miniaturization development of the transmission device.

Specifically, as shown in fig. 2, a support 21 is disposed at an end of the extension 20 away from the transmission shaft 11, and the support 21 is used for supporting the end of the extension 20 away from the transmission shaft 11, so as to avoid fracture caused by excessive radial force applied to the extension 20; the anti-collision blocks 22 are arranged at the support 21 and the box body 40 and used for preventing the extension piece 20 from moving to collide with the support 21 and the box body 40, so that the probability of damage to the box body 40, the extension piece 20 and the support 21 is reduced, and the service life is prolonged.

In the transmission device provided in the embodiment of the present application, an installation seat 19 is disposed at an end of the first transmission shaft 111 connected to the driver 50, the installation seat 19 is detachably connected to the box 40, and a through hole 191 is formed at a position of the installation seat 19 corresponding to the first transmission shaft 111.

The mounting seat 19 abuts against a side of the bearing 15 away from the gear, and it can be understood that, in the case of the mounting seat 19, the bearing 15 can be axially limited by the mounting seat 19, and the limiting member 18 can be omitted. The mounting base 19 is fixedly connected to the driver 50, and specifically, one end of the first transmission shaft 111 penetrates through the through hole 191 of the mounting base 19 and is fixedly connected to the driver 50.

Specifically, mount pad 19 is the flange, and one side that the flange deviates from the box is equipped with the recess, and during the recess was gone into to some card of driver 50, can carry out spacing and support to driver 50 through the recess to relative position between driver and the mount pad keeps, optimizes the atress of driver simultaneously, shares the effort that driver and first transmission shaft meet the part through the mutual contact between driver and the recess, reduces stress concentration, promotes the life of first transmission shaft and driver.

An engagement groove is concavely formed on a surface of one side of the driver 50 facing the box body 40, one end of the first transmission shaft 111 penetrates through the through hole 191, extends to the outside of the box body 40, and then is inserted into the engagement groove to be connected with the driver 50, and a key or other circumferential positioning pieces are arranged between the first transmission shaft 111 and the engagement groove. Make first transmission shaft 111 insert in the scarf joint groove of connecting in driver 50, can effectively increase the area of contact between the two to optimize the atress of junction between the two, reduce the unit area atress in the contact surface connects, reduce the condition that the stress is too big and lead to the deformation between first transmission shaft 111 and the driver 50, promote the life of the two.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. A transmission, characterized in that it comprises:

the speed change mechanism (10) comprises two transmission shafts (11) and a speed change assembly (12), wherein the two transmission shafts (11) are respectively in transmission connection with the speed change assembly (12);

an extension (20), said extension (20) being connected to at least one of said drive shafts (11); a connection hole (13) is formed inside the transmission shaft (11) to which the extension piece (20) is connected, a portion of the extension piece (20) is inserted into the connection hole (13), and the extension piece (20) is fixedly connected with the transmission shaft (11).

2. The transmission device according to claim 1, wherein the connecting hole (13) is a through hole passing through in the axial direction of the transmission shaft (11), and one end surface of the extension piece (20) is flush with one end surface of the transmission shaft (11);

the transmission device further comprises a positioning piece (30), and the positioning piece (30) is connected with one end face of the transmission shaft (11) and one end face of the extension piece (20) in a positioning mode.

3. Transmission according to claim 1, wherein said speed change assembly (12) comprises at least two gears (14), one gear (14) being fixedly mounted on each of said transmission shafts (11), said gears (14) being drivingly connected to each other.

4. A transmission according to claim 3, further comprising a housing (40), wherein the housing (40) has two first wall portions (41) opposite to each other, and wherein both ends of each of the transmission shafts (11) are rotatably connected to the two first wall portions (41) through bearings (15), respectively.

5. The transmission device according to claim 4, wherein the first wall portion (41) is provided with a through hole (44), the bearing (15) is installed in the corresponding through hole (44), one side of the bearing (15) away from the corresponding gear (14) is provided with a plurality of blocking pieces (16), the blocking pieces (16) are arranged at intervals along the circumferential direction of the bearing (15), the blocking pieces (16) are connected with the first wall portion (41), and the blocking pieces (16) are connected with the corresponding bearing (15).

6. The transmission device according to claim 4, characterized in that a separating ring piece (17) is arranged between the gear (14) and the two corresponding bearings (15), and the separating ring piece (17) is sleeved on the transmission shaft (11).

7. The transmission device according to claim 4, wherein a limiting member (18) is disposed on a side of the bearing (15) away from the gear (14), the limiting member (18) is connected to the corresponding transmission shaft (11), and at least a portion of the limiting member (18) protrudes from an outer circumferential surface of the transmission shaft (11).

8. Transmission according to claim 4, wherein said speed change assembly (12) further comprises at least one transition transmission shaft, both ends of said transition transmission shaft are rotatably connected to said two first wall portions (41), respectively, said transition transmission shaft is provided with a transition gear, said transition gear is drivingly connected between said two gears (14).

9. The transmission according to any one of claims 4 to 8, wherein the transmission shaft (11) comprises a first transmission shaft (111) and a second transmission shaft (112), the speed change assembly (12) comprises a first gear (141) and a second gear (142), the first gear (141) is mounted on the first transmission shaft (111), the second gear (142) is mounted on the second transmission shaft (112), and the first gear (141) is in transmission connection with the second gear (142); the first transmission shaft (111) is connected with a driver (50), and the second transmission shaft (112) is connected with the extension piece (20).

10. The transmission device according to claim 9, wherein a mounting seat (19) is provided at an end of the first transmission shaft (111) connected to the driver (50), the mounting seat (19) is detachably connected to the box body (40), and a through hole (191) is formed at a position of the mounting seat (19) opposite to the first transmission shaft (111).

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