CN207421236U - One kind two keeps off variable speed drive - Google Patents

Abstract

The utility model discloses a two-speed speed change transmission device, which comprises: a speed change mechanism and a wheel. The speed change mechanism includes: a main transmission shaft, a transmission frame and a driven shaft. connected, the main transmission shaft is provided with an input wheel, an output wheel and a driving wheel, and the input wheel is sleeved on the main transmission shaft and can rotate radially and move axially relative to the main transmission shaft. A first meshing portion and a second meshing portion are provided, a third meshing portion matched with the first meshing portion is provided on the driving wheel, and a fourth meshing portion matched with the second meshing portion is provided on the main transmission shaft. Engagement part, the output wheel is fixedly connected with the main transmission shaft, the first driven wheel matched with the driving wheel and the second driven wheel matched with the output wheel are arranged on the driven shaft, the first driven wheel The second driven wheel is respectively fixedly connected with the driven shaft, thereby reducing power loss.

Description

A two-speed transmission

【Technical field】

The utility model relates to the technical field of bicycles, in particular to a two-speed transmission device.

【Background technique】

Referring to Fig. 1, Fig. 1 discloses a two-speed transmission device in the prior art, which includes: a transmission frame 1 ′, an input shaft 2 ′ and an output shaft 3 ′ installed in the transmission frame 1 ′, the The transmission frame 1` is fixedly connected with the vehicle frame or is connected with shock absorption. Two driving wheels 4` are installed on the input shaft 2` in the transmission frame 1`, and the input shaft 2 is installed between the two driving wheels 4`. `The fixedly connected input sprocket 6`, two driven wheels 5` are installed on the output shaft 3`, internal splines are respectively arranged in the two driving wheels 4`, and the input shaft 2` is provided with The external splines matched with the above-mentioned internal splines realize shifting by axially moving the input shaft 2`, and the output shaft 3` of the transmission is connected to the wheel shaft through the differential and the connecting shaft. The defect of the transmission with this structure is that : 1. This kind of transmission is positioned based on the vehicle frame, which makes the positioning and installation of the transmission more inconvenient, and position deviation is prone to occur during the installation process, thereby affecting the transmission stability. 2. The output shaft of this kind of transmission and the wheel shaft pass through The connection between the differential and the connecting shaft makes the entire transmission structure more complicated; 3. When this type of transmission is in high gear, the power needs to reach the output shaft through the transmission of the transmission wheel, so there is power loss, and most bicycles in use The time is to use the high-speed gear, and the less time is to use the low-speed gear. Therefore, designing the high-speed gear as a gear with power loss will greatly increase the power loss of the transmission during bicycle riding.

Therefore, it is necessary to provide a two-speed transmission device that solves the above-mentioned technical problems.

【Content of utility model】

In order to solve the above problems, the purpose of this utility model is to provide a two-speed transmission device with simple structure and convenient manufacture.

A technical solution adopted by the utility model is: a two-speed transmission device, including: a speed change mechanism and wheels, and the speed change mechanism includes: a main transmission shaft, a transmission frame installed on the main transmission shaft, and a transmission frame installed on the transmission The driven shaft in the frame, the main transmission shaft and the transmission frame are connected by bearings, the two ends of the main transmission shaft are respectively connected with the wheel hubs, and the main transmission shaft is provided with input wheels, output wheels and The driving wheel, the input wheel is sleeved on the main transmission shaft and can rotate radially and move axially relative to the main transmission shaft. The input wheel is provided with a first meshing portion and a second meshing portion. The driving wheel A third meshing portion matched with the first meshing portion is provided on the top, a fourth meshing portion matched with the second meshing portion is provided on the main transmission shaft, and the driving wheel is sleeved on the main transmission shaft and can be Rotating relative to the main transmission shaft, the output wheel is fixedly connected to the main transmission shaft, a bearing is provided between the driven shaft and the transmission frame, and a first driven wheel matched with the driving wheel is provided on the driven shaft and a second driven wheel matched with the output wheel, the first driven wheel and the second driven wheel are respectively fixedly connected to the driven shaft.

Preferably, the two-speed variable speed transmission device in the present utility model is further set as follows: the first meshing part and the second meshing part are internal splines, and the third meshing part and the fourth meshing part are external splines .

Preferably, a two-speed transmission device in the present utility model is further set as follows: the driving wheel, the first driven wheel, the second driven wheel and the output wheel are all gears, and the driving wheel and the first driven wheel are in phase with each other. meshed, the second driven wheel meshes with the output wheel.

Preferably, the two-speed transmission device in the present utility model is further configured as follows: the driving wheel and the first driven wheel are connected through the first transmission medium, and the second driven wheel and the output wheel are connected through the first Two transmission medium connections.

Preferably, a two-speed transmission device in the present utility model is further configured as follows: the driving wheel, the first driven wheel, the second driven wheel and the output wheel are sprockets or pulleys, and the first transmission medium and The second transmission medium is a chain or a transmission belt.

Preferably, the two-speed variable transmission device in the present utility model is further configured as follows: the two ends of the main transmission shaft are respectively connected to the wheel hub through an overrunning clutch or one end of the main transmission shaft is fixedly connected to the wheel hub, The other end of the main transmission shaft is connected with the wheel hub through a bearing.

Preferably, a two-speed transmission device in the present utility model is further set as follows: the main transmission shaft is a three-section shaft, including a first shaft section, a second shaft section, and A third shaft segment between the shaft segments, the diameter of the third shaft segment is smaller than the diameters of the first shaft segment and the second shaft segment, the third shaft segment is a solid shaft, the first shaft segment and the second shaft segment The shaft section is a hollow tube shaft.

Preferably, the two-speed transmission device in the present utility model is further configured as follows: the third shaft section is connected with the first shaft section and the second shaft section by interference fit or screw connection respectively.

Preferably, the two-speed transmission device in the present utility model is further configured as follows: the input wheel includes a shaft sleeve and a wheel body mounted on the shaft sleeve, and an overrunning clutch is provided between the wheel body and the shaft sleeve.

Compared with the prior art, the utility model has the following beneficial effects: the main transmission shaft in the utility model is directly connected with the wheels, and there is no need to connect through a differential in the middle, thereby simplifying the structure. In addition, the entire speed change transmission device is based on The wheel shaft is used as the reference for positioning, which makes the installation and positioning more convenient and ensures good transmission stability. When the variable speed transmission device in the utility model is in high gear, the power is directly output at 1:1, and the power does not need to be driven by the driven wheel, so it is greatly reduced. The power loss is reduced, and the riding performance of the bicycle is improved.

【Description of drawings】

Fig. 1 is a schematic structural diagram of a transmission device in the prior art.

Fig. 2 is a front structural schematic diagram of the variable speed transmission device in the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of the variable speed transmission device in the present invention.

Fig. 4 is a partial enlarged view of A in Fig. 3 .

Fig. 5 is a schematic diagram of an exploded structure of the variable speed transmission device in the present invention.

Among Fig. 1: 1`, transmission frame, 2`, input shaft, 3`, output shaft, 4`, driving wheel, 5`, driven wheel, 6`, input sprocket.

Among Fig. 2 to Fig. 5: 1, left wheel, 2, right wheel, 3, main transmission shaft, 30, the first shaft section, 31, the second shaft section, 32, the 3rd shaft section, 320, the first outer flower Key, 33, input wheel, 330, axle sleeve, 331, wheel body, 332, first inner spline, 333, second inner spline, 34, driving wheel, 340, second outer spline, 35, output wheel , 4, transmission frame, 5, driven shaft, 50, first driven wheel, 51, second driven wheel, 6, first overrunning clutch, 7, second overrunning clutch, 8, first bearing, 9, second bearings.

【Detailed ways】

The two-speed transmission device described in the present utility model will be further described in detail through specific embodiments below.

As shown in Fig. 2 to Fig. 5, the utility model discloses a two-speed transmission device, comprising: left wheel 1, right wheel 2, main drive shaft 3, transmission frame 4 installed on the main drive shaft 3 and installation The driven shaft 5 in the transmission frame 4, the main transmission shaft 3 is a three-section shaft, including a first shaft section 30, a second shaft section 31 and a shaft arranged on the first shaft section 30 and the second shaft section 31. Between the third shaft section 32, the third shaft section 32 is a solid shaft, the first shaft section 30 and the second shaft section 31 are hollow tube shafts, and the diameter of the third shaft section 32 is smaller than the first shaft The diameters of the section 30 and the second shaft section 31 have the advantage of being designed in this way: it not only makes the main transmission shaft 3 have sufficient structural strength, but also reduces the size of the transmission. In this embodiment, the first shaft section 30 1. The second shaft section 31 is respectively sleeved on the third shaft section 32 and fixed with the third shaft section 32 through interference fit. Of course, in other embodiments, other fixing methods such as threaded connection can also be used. , can realize the utility model equally. In this embodiment, the first shaft segment 30 is connected to the hub of the left wheel 1 through the first overrunning clutch 6, and the second shaft segment 31 is connected to the hub of the right wheel 2 through the second overrunning clutch 7. Of course, in other embodiments, the first shaft section 30 is fixedly connected to the hub of the left wheel 1, the second shaft section 31 is connected to the hub of the right wheel 2 through bearings, or the first shaft section 30 is connected to the hub of the left wheel 1. The utility model can be realized through the bearing connection, the fixed connection between the second shaft section 31 and the 2 hubs of the right wheel.

A first bearing 8 is provided between the third shaft section 32 of the main transmission shaft 3 and the transmission frame 4, and an input wheel 33, a driving wheel 34 and an output wheel 35 are arranged on the main transmission shaft 3, and the driving wheel 34 is arranged between the input wheel 33 and the output wheel 35, the input wheel 33 can be relatively rotated and moved axially with respect to the main transmission shaft 3, the input wheel 33 includes a shaft sleeve 330 and a shaft mounted on the shaft sleeve 330 The wheel body 331, a third overrunning clutch (not shown) is arranged between the axle sleeve 330 and the wheel body 331, the effect is: when the input wheel 33 has no power input, the wheel can still continue to rotate with the inertia, the One end of the shaft sleeve 330 is provided with a first internal spline 332, and the third shaft section 32 of the main transmission shaft 3 is provided with a first external spline 320 matched with the first internal spline 332, and the input wheel 33 It can move axially relative to the third shaft section 32. The other end of the input wheel 33 sleeve 330 is provided with a second internal spline 333, and one end of the driving wheel 34 is provided with a second internal spline 333. Cooperating with the second external spline 340 , the drive wheel 34 is sheathed on the third shaft segment 32 and can rotate relative to the third shaft segment 32 , and the output wheel 35 is fixedly connected with the first shaft segment 30 . In this embodiment, the engagement between the input wheel 33 and the driving wheel 34 is achieved through spline fit, of course, in other embodiments, other engagement methods such as steel ball steel groove, pawl engagement, etc. can also be used to achieve engagement. . In this embodiment, the first internal spline 332 and the second internal spline 333 are respectively arranged on both sides of the shaft sleeve 330. Of course, in other embodiments, the first internal spline 332 and the second internal spline The inner spline 333 can also be arranged on the same side, which can also realize the utility model.

A second bearing 9 is provided between the driven shaft 5 and the transmission frame 4, a first driven wheel 50 is provided at one end of the driven shaft 5, and a second driven wheel is provided at the other end of the driven shaft 5. 51, the first driven wheel 50 and the second driven wheel 51 are respectively fixedly connected to the driven shaft 5, and the first driven wheel 50 is connected to the driving wheel 34 through a first transmission medium (not shown), so The second driven wheel 51 is connected to the output wheel 35 through a second transmission medium (not shown). In this embodiment, the driving wheel 34, the first driven wheel 50, the second driven wheel 51 and the output wheel 35 is a sprocket, and the first transmission medium and the second transmission medium are chains. Of course, in other embodiments, the driving wheel 34, the first driven wheel 50, the second driven wheel 51 and the output wheel 35 can also be It is belt pulley, and described first transmission medium and second transmission medium also can be transmission belt, can realize the utility model equally, perhaps do not adopt transmission medium, directly drive wheel 34, first driven wheel 50, second driven wheel 51 And output wheel 35 is designed as gear transmission, can realize the utility model equally.

The working principle of the speed change device in this embodiment is: when in high gear, the first inner spline in the bushing 330 of the input wheel 33 meshes with the first outer spline 320 on the third shaft section 32 of the main transmission shaft 3, The power is input by the input wheel 33, 1:1 is directly output by the main transmission shaft 3 and drives the wheels at both ends of the main transmission shaft 3 to rotate. Disengage with the first external spline 320 on the main transmission shaft 3, and make the second internal spline 333 at one end of the input wheel 33 mesh with the second external spline 340 at one end of the driving wheel 34. The input wheel 33 inputs, because the input wheel 33 is meshed with the driving wheel 34, so the driving wheel 34 rotates, because the driving wheel 34 and the first driven wheel 50 are driven by a chain, so the power is transmitted to the first driven wheel 50, due to the second driven wheel 50 A driven wheel 50 and a second driven wheel 51 are fixedly connected with the driven shaft 5 respectively, so the second driven wheel 51 rotates, because the second driven wheel 51 and the output wheel 35 are driven by a chain, so the output wheel 35 rotates, because The output wheel 35 is fixedly connected with the main transmission shaft 3 , so the power is finally transmitted to the main transmission shaft 3 and is output by the main transmission shaft 3 .

The main transmission shaft 3 in the utility model is directly connected with the wheels, and there is no need to connect through a differential in the middle, thereby simplifying the structure. In addition, the entire speed change transmission device is positioned on the basis of the wheel shaft, which makes the installation and positioning more convenient and ensures In order to ensure good transmission stability, the variable speed transmission device in the utility model directly outputs power at a high speed 1:1, and the power does not need to be driven by the driven wheel, so the power loss is greatly reduced and the riding performance of the bicycle is improved.

The above-mentioned embodiments only illustrate the principles and effects of the invention of the utility model, and partially used embodiments, rather than limit the utility model; it should be pointed out that for those of ordinary skill in the art, without departing Under the premise of the inventive concept of the utility model, some deformations and improvements can also be made, and these all belong to the protection scope of the utility model.

Claims (9)

1. A two-speed transmission device, characterized in that it comprises: a speed change mechanism and a wheel, and the speed change mechanism includes: a main transmission shaft, a transmission frame installed on the main transmission shaft and a driven shaft installed in the transmission frame , the main transmission shaft is connected with the transmission frame through bearings, the two ends of the main transmission shaft are respectively connected with the wheel hub, the main transmission shaft is provided with an input wheel, an output wheel and a driving wheel, and the input The wheel is sleeved on the main transmission shaft and can rotate radially and move axially relative to the main transmission shaft. The input wheel is provided with a first meshing portion and a second meshing portion. The driving wheel is provided with a The third meshing portion matched with the meshing portion, the main drive shaft is provided with a fourth meshing portion matched with the second meshing portion, the drive wheel is sleeved on the main drive shaft and can rotate relative to the main drive shaft , the output wheel is fixedly connected with the main transmission shaft, a bearing is arranged between the driven shaft and the transmission frame, and a first driven wheel matched with the driving wheel and a first driven wheel matched with the output wheel are arranged on the driven shaft The second driven wheel, the first driven wheel and the second driven wheel are respectively fixedly connected with the driven shaft. 2. A two-speed variable speed transmission device according to claim 1, characterized in that: the first meshing part and the second meshing part are inner splines, and the third meshing part and the fourth meshing part are outer splines. splines. 3. A two-speed transmission device as claimed in claim 1, characterized in that: the driving wheel, the first driven wheel, the second driven wheel and the output wheel are all gears, and the driving wheel and the first driven wheel The driving wheel is meshed, and the second driven wheel is meshed with the output wheel. 4. A two-speed transmission device as claimed in claim 1, characterized in that: said driving wheel and first driven wheel are connected through a first transmission medium, and between said second driven wheel and output wheel The connection is via the second transmission medium. 5. A two-speed transmission device as claimed in claim 4, characterized in that: the driving wheel, the first driven wheel, the second driven wheel and the output wheel are sprockets or pulleys, and the first transmission The medium and the second transmission medium are chains or transmission belts. 6. A two-speed transmission device as claimed in claim 1, characterized in that: the two ends of the main transmission shaft and the wheel hub are respectively connected by an overrunning clutch or one end of the main transmission shaft is fixed to the wheel hub Connection, the other end of the main transmission shaft and the wheel hub are connected by bearings. 7. A two-speed variable speed transmission device according to claim 1, characterized in that: the main drive shaft is a three-section shaft, comprising a first shaft section, a second shaft section, and A third shaft segment between the second shaft segments, the diameter of the third shaft segment is smaller than the diameters of the first shaft segment and the second shaft segment, the third shaft segment is a solid shaft, the first shaft segment and The second shaft section is a hollow tube shaft. 8 . The two-speed transmission device according to claim 7 , wherein the third shaft section is connected with the first shaft section and the second shaft section by interference fit or screw thread respectively. 9 . 9. A two-speed transmission device as claimed in claim 1, characterized in that: the input wheel includes a shaft sleeve and a wheel body mounted on the shaft sleeve, and an overrunning gear is provided between the wheel body and the shaft sleeve. clutch.