CN110630712A - Transmission and gear selecting and shifting mechanism thereof - Google Patents
Transmission and gear selecting and shifting mechanism thereof Download PDFInfo
- Publication number
- CN110630712A CN110630712A CN201810646383.8A CN201810646383A CN110630712A CN 110630712 A CN110630712 A CN 110630712A CN 201810646383 A CN201810646383 A CN 201810646383A CN 110630712 A CN110630712 A CN 110630712A
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- gear
- shifting
- shaft
- shift
- rack
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
- F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
- F16H19/04—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack
- F16H19/043—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack for converting reciprocating movement in a continuous rotary movement or vice versa, e.g. by opposite racks engaging intermittently for a part of the stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/02—Selector apparatus
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear-Shifting Mechanisms (AREA)
Abstract
The invention discloses a transmission and a gear selecting and shifting mechanism thereof, wherein the gear selecting and shifting mechanism comprises: the back of each gear rack is provided with a shifting finger; the gear shifting shaft is fixedly provided with a gear shifting gear, and the gear shifting gear can be meshed with any gear rack; the gear selecting motor is in transmission connection with the gear shifting shaft and can drive the gear shifting shaft to displace along the axial direction of the gear shifting shaft, so that the gear shifting gear is meshed with different gear racks; the gear shifting motor is in transmission connection with the gear shifting shaft and can drive the gear shifting shaft to rotate around the axial direction of the gear shifting shaft so as to drive the gear shifting rack meshed with the gear shifting gear to move, and then a gear shifting fork arranged in the transmission is shifted through a shifting finger of the gear shifting rack. The gear selecting and shifting mechanism provided by the invention has a simpler structure and higher integration level.
Description
Technical Field
The invention relates to the technical field of transmissions, in particular to a transmission and a gear selecting and shifting mechanism thereof.
Background
In the current automatic Transmission, especially taking DCT (Dual Clutch Transmission) as an example, a shifting mechanism thereof generally adopts a hydraulic actuator, during shifting, the hydraulic actuator can push shifting forks to shift gears, each shifting fork controls two gears, the shifting fork is installed on a housing of the Transmission through a shifting fork shaft, and several such hydraulic actuators are required for several shifting forks.
The gear shifting mechanism in the form has the advantages that the structure is dispersed, the gear shifting is carried out by adopting hydraulic pressure, a special hydraulic oil duct needs to be arranged, and the complexity is high.
Therefore, how to provide a gear shifting mechanism with a simple structure and high integration level remains a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a transmission and a gear selecting and shifting mechanism thereof, wherein the structure of the gear selecting and shifting mechanism is simpler, and the integration level is higher.
In order to solve the above technical problem, the present invention provides a gear selecting and shifting mechanism for a transmission, including: the back of each gear rack is provided with a shifting finger; the gear shifting shaft is fixedly provided with a gear shifting gear, and the gear shifting gear can be meshed with any gear rack; the gear selecting motor is in transmission connection with the gear shifting shaft and can drive the gear shifting shaft to displace along the axial direction of the gear shifting shaft, so that the gear shifting gear is meshed with different gear racks; the gear shifting motor is in transmission connection with the gear shifting shaft and can drive the gear shifting shaft to rotate around the axial direction of the gear shifting shaft so as to drive the gear shifting rack meshed with the gear shifting gear to move, and then a gear shifting fork arranged in the transmission is shifted through a shifting finger of the gear shifting rack.
Compared with the prior art, the gear selecting and shifting mechanism is more compact in structure, higher in integration level, free of arrangement of a special hydraulic oil duct and relatively simple in structure.
Optionally, the rotating shaft of the shift motor and the shift shaft are driven by a gear, a pulley or a sprocket.
Optionally, a first gear is fixed to a rotating shaft of the shift motor, a second gear is sleeved outside the shift shaft, the first gear is meshed with the second gear, and the second gear can rotate synchronously with the shift shaft; the first limiting structure can limit the axial displacement of the second gear.
Optionally, the second gear and the shift gear are both sector gears.
Optionally, the gear selecting device further comprises a lead screw, wherein a polished rod section of the lead screw is connected with a rotating shaft of the gear selecting motor and can synchronously rotate with the rotating shaft of the gear selecting motor; the screw nut is sleeved on the threaded section of the screw, the screw nut is connected with the gear shifting shaft and can push the gear shifting shaft to perform axial displacement, and the screw nut and the gear shifting shaft can rotate relatively.
Optionally, a second limit structure is further disposed between the housing of the transmission and the shift shaft, and the second limit structure can limit the rotation range of the shift shaft.
Optionally, the second limiting structure comprises a limiting groove and a limiting rod, one of the limiting groove and the limiting rod is arranged on the gear shift shaft, and the other is arranged on the shell of the transmission; the limiting rod is inserted into the limiting groove, and when the limiting rod abuts against one side wall of the limiting groove along the rotating direction, the rotation of the gear shifting shaft can be limited.
Optionally, at least one axial end of the gear rack is provided with a return spring, and when no external force acts, the return spring can enable the gear rack to return to the initial position.
Optionally, the gear racks comprise a forward gear rack and a reverse gear rack; the forward gear racks are sequentially arranged along the axial direction of the gear shifting shaft, and gears corresponding to the forward gear racks sequentially change.
The invention also provides a transmission which comprises a shell, wherein the shell is provided with a gear selecting and shifting mechanism, and the gear selecting and shifting mechanism is the gear selecting and shifting mechanism.
Since the above-mentioned gear selecting and shifting mechanism has the technical effects, the transmission having the gear selecting and shifting mechanism also has similar technical effects, and therefore, the detailed description thereof is omitted.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a gear selection and shift mechanism provided in the present invention;
FIG. 2 is a view of FIG. 1 from another perspective;
FIG. 3 is a schematic structural diagram of the gear selecting and shifting mechanism of FIG. 1 when shifting to first gear;
fig. 4 is a schematic structural diagram of the gear selecting and shifting mechanism in fig. 1 when the gear selecting and shifting mechanism is switched to the third gear.
The reference numerals in fig. 1-4 are illustrated as follows:
1-gear rack, 11-shifting finger, 12-return spring, 13-1/2 gear rack, 14-3/4 gear rack, 15-5/6 gear rack and 16 reverse gear rack;
2-gear shifting shaft, 21-gear shifting gear, 22-second gear, 23-limiting wheel and 231-limiting groove;
3-a gear selecting motor;
4-shift motor, 41-first gear;
5-a lead screw;
6-limiting rod.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As used herein, the term "plurality" refers to an indefinite number of plural, usually more than two; and when the number of "a few" is used to indicate the number of some of the components, it does not indicate that the number of these components is the same.
The terms "first", "second", and the like, as used herein are used for convenience only to describe two or more structures or components that are the same or similar in structure, and do not denote any particular limitation on the order.
Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of a gear selecting and shifting mechanism according to an embodiment of the present invention, fig. 2 is a view of fig. 1 from another perspective, fig. 3 is a schematic structural diagram of the gear selecting and shifting mechanism in fig. 1 when shifting to a first gear, and fig. 4 is a schematic structural diagram of the gear selecting and shifting mechanism in fig. 1 when shifting to a third gear.
As shown in fig. 1 to 4, the present invention provides a gear selecting and shifting mechanism for a transmission, which includes a plurality of gear racks 1, where each gear rack 1 corresponds to two gears, or alternatively, each gear rack 1 may correspond to one gear, and the gear selecting and shifting mechanism may be specifically set according to a use requirement. The back surface (the surface opposite to the tooth surface and reflecting the figure as the lower end surface) of each gear rack 1 is provided with a shifting finger 11, one gear rack 1 corresponds to one shifting fork in the transmission, and when the gear rack 1 is controlled to move along the axial direction of the gear rack, the shifting finger 11 arranged on the gear rack 1 can push the corresponding shifting fork to move, so that gear shifting is completed.
In a specific embodiment, each gear rack 1 can be driven by an electric motor and a gear shift shaft 2. In detail, a shift gear 21 is fixed on the shift shaft 2, and the shift gear 21 can be meshed with any one of the gear racks 1 so as to drive the corresponding gear rack 1 to act; the gear selecting motor 3 is in transmission connection with the gear shifting shaft 2 and can drive the gear shifting shaft 2 to axially displace, so that the gear shifting gear 21 can be meshed with different gear racks 1 to complete gear selecting operation; the gear shifting motor 4 is also in transmission connection with the gear shifting shaft 2 and can drive the gear shifting shaft 2 to rotate around the axial direction of the gear shifting shaft, so as to drive the gear rack 1 and the shifting finger 11 which are meshed with the gear shifting gear 21 to move, and thus the gear shifting operation is completed. It should be noted that at any moment, the above-mentioned shift gear 21 can only mesh with one gear rack 1 at most, so as to avoid the situation that multiple gears are engaged at the same time due to the simultaneous actions of multiple gear racks 1.
Therefore, the gear selecting motor 3 and the gear shifting motor 4 are matched with the gear shifting shaft 2, and the corresponding gear rack 1 can be easily driven to move so as to complete gear selecting and gear shifting. Compared with the scheme of shifting by adopting a hydraulic actuator in the prior art, the gear selecting and shifting mechanism provided by the invention has the advantages that the structure is more compact, the integration level is higher, in addition, a special hydraulic oil duct is not required to be configured in the implementation process, and the structure can also be greatly simplified.
In detail, the rotating shaft of the gear shifting motor 4 and the gear shifting shaft 2 can be driven by gears, belt wheels or chain wheels, so that the rotating shaft of the gear shifting motor 4 drives the gear shifting shaft 2 to rotate. Particularly, in the embodiment of the invention, gears are preferably adopted between the gear shifting motor 4 and the gear shifting shaft 2 for transmission, so that the occupied space of a connecting structure between the gear shifting motor and the gear shifting shaft is reduced, and the integration level of the gear shifting mechanism provided by the invention can be further improved; compare in band pulley and sprocket feed, gear drive is the rigid engagement, and its response speed is faster, more is favorable to realizing shifting fast, and the reliability of connecting is also higher, is difficult for producing faults such as sliding belt.
With reference to fig. 1, a first gear 41 may be fixed to a rotation shaft of the shift motor 4, a second gear 22 may be sleeved on the shift shaft 2, and the first gear 41 and the second gear 22 may be meshed with each other. The second gear 22 may be in particular splined to the shift shaft 2 and may be rotated synchronously with the shift shaft 2 to actuate the shift gear 21 fixed to the shift shaft 2 for a shifting operation. The diameter of the second gear 22 may be larger than that of the first gear 41, that is, the first gear 41 and the second gear 22 may be combined to form a set of speed reduction structures, the second gear 41 rotates one turn, and the second gear 22 may rotate only half a turn or less, so as to reduce the rotation speed of the second gear 22, and further improve the accuracy of the rotation control of the shift shaft 2. The embodiment of the present invention does not limit the transmission ratio between the first gear 41 and the second gear 22, and can be determined according to actual needs.
In the above-described aspect, the second gear 22 and the shift shaft 2 have only a connection relationship of synchronous rotation, and there may be a degree of freedom of axial relative displacement therebetween; in fact, the axial position of the second gear 22 cannot be changed when the shift shaft 2 is axially displaced, and the second gear 22 needs to be always engaged with the first gear 41 to ensure smooth shifting operation. The axial direction refers to the axial direction of the shift shaft 2.
For this purpose, a first limit structure may be further provided, which is capable of limiting the axial displacement of the second gear 22 to ensure that the axial position of the second gear 22 is unchanged. Specifically, the first limiting structure may be a limiting groove arranged in the transmission housing, the second gear 22 may be clamped into the limiting groove, and the thickness of the second gear 22 may be consistent with the width of the limiting groove, so that the two side walls of the limiting groove can abut against the two axial end surfaces of the second gear 22 to limit the axial position of the second gear 22; alternatively, the first limiting structure may be two limiting plates (blocks) arranged on the inner wall surface of the transmission housing, and the axial position of the second gear 22 may be further limited by the two limiting plates (blocks); of course, the first limiting structure may also adopt other structures, and may be specifically set according to actual installation environment and the like.
In the embodiment of the present invention, the rotation angle required for the shift shaft 2 to drive the shift rack 1 for the shifting operation is not limited. In practical applications, when the gear shift wheel 21 is already engaged with the gear rack 1, the gear shift shaft 2 can be rotated less than one turn to complete the gear shift operation, or can be rotated several turns to move the gear rack 1 to the right position to complete the gear shift operation.
In view of shortening the shifting time and improving the shifting efficiency, the embodiment of the present invention preferably employs a scheme in which the shift shaft 2 performs a small-angle (less than one rotation) rotation to complete the shifting operation. That is, in use, the gear shift shaft 2 does not need to rotate one turn, and even the gear shift shaft 2 only needs to rotate a small angle (e.g. 30-60 degrees), so that the gear rack 1 can be controlled to complete gear shifting.
Based on this, the second gear 22 and the shift gear 21 disposed on the shift shaft 2 do not need to adopt complete gears, and only the meshing relationship between the second gear 22 and the first gear 41, and between the shift gear 21 and the shift rack 1 is ensured within the range of the rotation angle of the shift shaft 2, so as to realize power transmission.
That is, the second gear 22 and the shift gear 21 may be both sector gears. Therefore, on one hand, the occupied space of the gear selecting and shifting mechanism provided by the invention can be reduced to further improve the structural compactness of the gear selecting and shifting mechanism, and on the other hand, the weight of the gear shifting mechanism can be reduced, so that the weight of a transmission and the whole vehicle is reduced to reduce the oil consumption. Of course, the embodiment of the present invention does not exclude the solution of setting the second gear 22 and the shift gear 21 as complete gears, and it can also achieve the purpose of driving the gear rack 1 to perform the shifting operation.
Different from a transmission structure between the gear shifting motor 4 and the gear shifting shaft 2, the gear selecting motor 3 and the gear shifting shaft 2 can be transmitted by adopting the lead screw 5, so that the gear shifting shaft 2 is driven to axially displace when the gear selecting motor 3 acts.
In detail, the screw 5 may be a ball screw or a trapezoidal screw, a polished rod section of the screw may be connected to a rotating shaft of the gear selecting motor 3 and may rotate synchronously with the rotating shaft, and a threaded section of the screw 5 may be sleeved with a screw nut, which may be connected to the shift shaft 2. When the gear selecting motor 3 operates, the screw 5 can convert the rotary motion of the rotating shaft of the gear selecting motor 3 into the linear motion of a screw nut, and then drives the gear shifting shaft 2 to perform axial displacement so as to perform gear selecting operation.
The connecting end of the shift shaft 2 and the lead screw 5 can be a hollow shaft, a lead screw nut can be positioned in a central hole of the hollow shaft, and a bearing or a bush can be arranged between the outer wall of the lead screw nut and the inner wall of the hollow shaft so as to realize the relative rotation between the lead screw nut and the shift shaft 2. That is to say, the lead screw nut can only carry out synchronous axial displacement with the gear shift axle 2, and can not synchronous rotation to avoid shift motor 4 to order about gear shift axle 2 to rotate when shifting gears and drive the lead screw nut and rotate and lead to the axial position of gear shift axle 2 to change. Taking the bearing connection as an example, the screw nut, the bearing and the shift shaft 2 can be pressed and mounted to ensure the axial fixation of the three components.
The screw 5 can also adopt a planetary roller screw with higher precision, and at the moment, a plurality of rollers can be arranged between the screw nut and the thread section.
As described above, in the embodiment of the present invention, the shift shaft 2 is normally rotated only by a small angle to complete the shift. So, for avoiding the turned angle of the gear shift shaft 2 too big in actual operation, produce too big effort to the gear shift fork, can also set up the second limit structure between the casing of derailleur and gear shift shaft 2 to restriction gear shift shaft 2's rotation range.
Specifically, the second limit structure may include a limit groove 231 and a limit rod 6, one of the limit groove 231 and the limit rod 6 may be disposed on the shift shaft 2, and the other may be disposed on the housing of the transmission; the limiting rod 6 can be inserted into the limiting groove 231, and along with the rotation of the gear shifting shaft 2, the limiting rod 6 can be abutted against one side wall of the limiting groove 231 in the rotation direction so as to limit the rotation of the gear shifting shaft 2.
Still taking fig. 1 as a view point, one end of the shift shaft 2 away from the gear selecting motor 3 may be provided with a limiting wheel 23, and the limiting groove 231 may be a through groove disposed on a peripheral wall of the limiting wheel 23, that is, the limiting groove 231 may be formed by radially inwardly recessing the peripheral wall of the limiting wheel 23; the limit rod 6 fixed to the transmission case may be inserted into the limit groove 231 in the axial direction. With the rotation of the shift shaft 2, the limit lever 6 can abut against the two side walls of the limit groove 231 in the circumferential direction (rotation direction), thereby preventing the shift shaft 2 from continuing to rotate. The aforementioned limit groove 231 may be provided only on the end surface of the limit gear 23 facing the second gear 22, that is, the limit groove 231 may not axially penetrate the limit gear 23; alternatively, the limiting groove 231 may be replaced by an arc-shaped limiting hole along the circumferential direction, and the above technical effects can be achieved.
It should be noted that the above detailed description of the second limiting structure formed by the limiting rod 6 and the limiting groove 231 is only an exemplary description of the embodiment of the present invention, and cannot be taken as a limitation to the implementation range of the gear selecting and shifting mechanism provided by the present invention; in fact, in practical applications, a person skilled in the art can completely adopt other limiting structures to achieve the above technical effects, for example, limiting blocks can be respectively arranged on the transmission housing and the shift shaft 2, when the shift shaft 2 rotates to a specific angle, the two limiting blocks can be abutted, and the technical effect of limiting the rotation range of the shift shaft 2 can also be achieved.
In fact, the second limit structure may not exist, and in the specific implementation, a person skilled in the art can strictly control the start and stop of the shift motor 4 by presetting a control program, and can also control the rotation angle of the shift shaft 2, so as to avoid that when the rotation angle of the shift shaft 2 is too large, the tooth surface damage caused by too large acting force generated between the shift gear 21 and the shift rack 1 and the shift fork damage caused by too large acting force generated by the finger 11 on the shift fork are avoided.
With respect to the gear selection and shift mechanism according to the above embodiments, the following embodiments of the present invention will also describe a specific structure of the gear rack 1 of the gear selection and shift mechanism. For convenience of description, a position where the shift rack 1 does not perform a shifting operation (is not applied with an external force) is referred to as an original position, and a position where the shift rack 1 is shifted by an external force to push the shift fork to complete shifting is referred to as a shifting position.
At least one of the two axial ends of the gear rack 1 may be provided with a return spring 12. According to the arrangement, when the gear shifting gear 21 is separated from the current gear rack 1 and is shifted to the next gear rack 1, the external force acting on the current gear rack 1 disappears, the return spring 12 can enable the gear rack 1 to quickly return to the initial position so as to remove the gear corresponding to the current gear rack 1, and the situation that when the gear shifting gear 21 is moved to the next gear rack 1 to perform gear shifting operation, the current gear rack 1 is still in the gear shifting position and multiple gears are simultaneously hung can be avoided.
In another embodiment, the above-mentioned return spring 12 may not be present, and in this case, the gear selecting motor 3 and the gear shifting motor 4 may be operated by a preset control program to avoid a situation where multiple gears are engaged simultaneously. Specifically, when the gear shift gear 21 is meshed with the current gear rack 1 and the current gear rack 1 is moved to a gear shift position to engage the current gear, if a gear shift operation is required, the gear shift shaft 2 is controlled by the gear shift motor 4 to rotate reversely by a certain angle, so that the gear shift gear 21 drives the current gear rack 1 to move to return to an original position, and the engagement state of the current gear is released, wherein the operation of the step is equivalent to controlling the gear shift lever to engage a neutral gear during gear shift so as to ensure that no gear is engaged currently; then, the gear selecting motor 3 acts to control the gear shifting shaft 2 to perform axial displacement, so that the gear shifting gear 21 is separated from the current gear rack 1 and moves to be meshed with the next gear rack 1, and then gear shifting operation is performed. With this structure, it is also possible to avoid a situation where a plurality of gears are engaged at the same time.
In comparison, the scheme provided with the return spring 12 does not need to control the gear shifting motor 4 to rotate reversely when the gear shifting operation is performed, and directly controls the gear selecting motor 3 to operate so that the gear shifting gear 21 is separated from the current gear rack 1, and then the next gear rack 1 can be entered, so that the gear shifting time is shorter, and the gear shifting efficiency is higher, which is the preferable scheme of the embodiment of the invention.
In addition, each gear rack 1 is quickly returned to the original position after being separated from the gear shift 21, so that the gear shift 21 can more easily pass through each gear rack 1 during gear selection operation, and the situation that the gear teeth of the gear shift 21 are axially abutted with the meshing teeth of the gear rack 1 to clamp the gear shift 21 due to axial displacement is avoided. Of course, in practical operation, the shapes of the teeth of the gear wheel 21 and the meshing teeth of the gear rack 1 can be controlled to avoid axial interference between the two.
The gear rack 1 may include a forward gear rack and a reverse gear rack 16, the number of the forward gear racks is related to the number of forward gears, in the embodiment of the present invention, the forward gears may include six gears, and each forward gear rack corresponds to two gears, specifically, the 1/2 gear rack 13, the 3/4 gear rack 14 and the 5/6 gear rack 15, and is used for shifting gears 1 and 2, gears 3 and 4, and gears 5 and 6, respectively.
In a specific arrangement, the forward gear racks can be arranged together and sequentially along the axial direction of the shift shaft 2, and the gears corresponding to the forward gear racks are sequentially changed, that is, along the axial direction of the shift shaft 2, the gears corresponding to the forward gear racks are arranged in the order of 1/2-3/4-5/6 or 5/6-3/4-1/2, so that when a sequential upshift or downshift operation is performed, such as an upshift from two gears to three gears, the shift gear 21 only needs to be moved to the adjacent gear rack 1 to perform a shift operation, the shift time is shorter, and the shift efficiency is higher. Of course, the embodiment of the present invention does not exclude the solution that the gears corresponding to the forward gear racks are arranged in a disorder manner, and in the specific implementation, a person skilled in the art may completely adopt the disorder arrangement scheme, for example, the gear arrangement order of 1/2-5/6-3/4 may be adopted. The reverse rack 16 is preferably disposed axially forward or rearward of each forward rack, i.e., the reverse rack 16 is not disposed between each forward rack, to avoid affecting the shift efficiency in upshifts.
As shown in fig. 3 and 4, in a specific embodiment, in a direction approaching the gear selecting motor 3, each gear rack 1 may be an 1/2 gear rack 13, a 3/4 gear rack 14, a 5/6 gear rack 15 and a reverse gear rack 16 in sequence, the left side of each forward gear rack may be 1/3/5 gear, the right side thereof may be 2/4/6 gear, and the left side or the right side of the reverse gear rack 16 may be reverse gear, which may be specifically set as required.
With fig. 3 as a view angle, when a first gear needs to be engaged, the gear selecting motor 3 may be controlled to operate first, so that the gear shifting gear 21 may be engaged with the gear shifting rack 1/2, and then the gear shifting motor 4 may be controlled to operate, so that the gear shifting gear 21 may rotate clockwise (as viewed from the direction of the limiting wheel 23 toward the gear selecting motor 3), the gear shifting rack 1/2 may displace leftward, and the shift finger 11 may push the gear shifting fork, and the gear shifting fork may push the 1/2 gear synchronizer, so as to complete the engagement of the first gear; when the second gear needs to be engaged, the gear shifting motor 4 is directly controlled to rotate reversely, so that the gear shifting gear 21 rotates anticlockwise, the gear shifting rack 1/2 moves rightwards, the shifting finger 11 pushes the gear shifting fork, and the gear shifting fork pushes the 1/2 gear synchronizer, so that the engagement of the second gear can be completed.
When the third gear or the fourth gear needs to be engaged, as shown in fig. 4, the shift gear 21 is moved to engage with the 3/4 gear rack 14, and the above control process is repeated. The engagement processes of the fifth gear, the sixth gear and the reverse gear (R gear) are similar to the above processes, and are not described herein again.
The embodiment of the invention also provides a transmission, which comprises a shell, wherein a gear selecting and shifting mechanism is arranged in the shell, and the gear selecting and shifting mechanism is the gear selecting and shifting mechanism related to the above embodiments.
Since the above-mentioned gear selecting and shifting mechanism has the technical effects, the transmission having the gear selecting and shifting mechanism also has similar technical effects, and therefore, the detailed description thereof is omitted.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (10)
1. A gear selection and shift mechanism for a transmission, comprising:
the gear rack comprises a plurality of gear racks (1), wherein the back of each gear rack (1) is provided with a shifting finger (11);
the gear shifting device comprises a gear shifting shaft (2), wherein a gear shifting gear (21) is fixed on the gear shifting shaft (2), and the gear shifting gear (21) can be meshed with any gear rack (1);
the gear selecting motor (3) is in transmission connection with the gear shifting shaft (2) and can drive the gear shifting shaft (2) to axially displace so that the gear shifting gear (21) is meshed with different gear racks (1);
gear shift motor (4), gear shift motor (4) with gear shift shaft (2) transmission is connected, and can drive gear shift shaft (2) rotate around its axial, in order to drive with gear shift (21) mesh mutually keep off a position rack (1) action, and then pass through the shift fork of shifting in locating the derailleur is stirred in dialling finger (11) that keeps off a position rack (1).
2. The gear shift mechanism according to claim 1, characterized in that the rotation shaft of the shift motor (4) and the shift shaft (2) are driven by gears, pulleys or sprockets.
3. The gear selecting and shifting mechanism according to claim 2, characterized in that a first gear (41) is fixed on a rotating shaft of the gear shifting motor (4), a second gear (22) is sleeved outside the gear shifting shaft (2), the first gear (41) is meshed with the second gear (22), and the second gear (22) can rotate synchronously with the gear shifting shaft (2);
the gear mechanism further comprises a first limiting structure which can limit the axial displacement of the second gear (22).
4. The gear selection mechanism according to claim 3, characterized in that the second gear wheel (22) and the gear shifting wheel (21) are both sector gears.
5. The gear selecting and shifting mechanism according to claim 1, further comprising a lead screw (5), wherein a polished rod section of the lead screw (5) is connected with a rotating shaft of the gear selecting motor (3) and can synchronously rotate with the rotating shaft of the gear selecting motor (3);
the screw nut is sleeved on the threaded section of the screw rod (5), the screw nut is connected with the gear shifting shaft (2) and can push the gear shifting shaft (2) to perform axial displacement, and the screw nut and the gear shifting shaft (2) can rotate relatively.
6. The gearshift mechanism according to any of claims 1-5, characterized in that a second limit structure is further provided between the housing of the transmission and the shift shaft (2), the second limit structure being capable of limiting the rotational range of the shift shaft (2).
7. The gear selection mechanism according to claim 6, wherein the second limit structure comprises a limit groove (231) and a limit rod (6), one of the limit groove (231) and the limit rod (6) is arranged on the shift shaft (2), and the other is arranged on the housing of the transmission;
the limiting rod (6) is inserted into the limiting groove (231), and when the limiting rod (6) abuts against one side wall of the limiting groove (231) along the rotating direction, the rotation of the gear shifting shaft (2) can be limited.
8. The gear selection mechanism according to claim 6, characterized in that at least one axial end of the gear rack (1) is provided with a return spring (12), and the return spring (12) can return the gear rack (1) to the initial position when no external force acts.
9. The gear selection mechanism according to claim 6, characterized in that the gear rack (1) comprises a forward gear rack and a reverse gear rack (16);
the forward gear racks are sequentially arranged along the axial direction of the gear shifting shaft (2), and gears corresponding to the forward gear racks sequentially change.
10. A transmission comprising a housing provided with a gear selection and shift mechanism, characterized in that the gear selection and shift mechanism is as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810646383.8A CN110630712A (en) | 2018-06-21 | 2018-06-21 | Transmission and gear selecting and shifting mechanism thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810646383.8A CN110630712A (en) | 2018-06-21 | 2018-06-21 | Transmission and gear selecting and shifting mechanism thereof |
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| CN110630712A true CN110630712A (en) | 2019-12-31 |
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| CN201810646383.8A Pending CN110630712A (en) | 2018-06-21 | 2018-06-21 | Transmission and gear selecting and shifting mechanism thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111561562A (en) * | 2020-05-22 | 2020-08-21 | 安徽江淮汽车集团股份有限公司 | Vehicle auxiliary gearbox gear shifting device, auxiliary gearbox, vehicle and control method |
| CN112360973A (en) * | 2020-11-25 | 2021-02-12 | 南京清研海易新能源动力有限责任公司 | Gearshift and vehicle |
| CN114251448A (en) * | 2021-12-09 | 2022-03-29 | 浙江华洋赛车股份有限公司 | Self-locking stepping gear shifting mechanism |
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| CN102678913A (en) * | 2011-11-22 | 2012-09-19 | 河南科技大学 | Screw rod gear selecting and gear shifting mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111561562A (en) * | 2020-05-22 | 2020-08-21 | 安徽江淮汽车集团股份有限公司 | Vehicle auxiliary gearbox gear shifting device, auxiliary gearbox, vehicle and control method |
| CN112360973A (en) * | 2020-11-25 | 2021-02-12 | 南京清研海易新能源动力有限责任公司 | Gearshift and vehicle |
| CN112360973B (en) * | 2020-11-25 | 2022-04-08 | 南京清研海易新能源动力有限责任公司 | Gearshift and vehicle |
| CN114251448A (en) * | 2021-12-09 | 2022-03-29 | 浙江华洋赛车股份有限公司 | Self-locking stepping gear shifting mechanism |
| CN114251448B (en) * | 2021-12-09 | 2024-03-22 | 浙江华洋赛车股份有限公司 | Self-locking stepping gear shifting mechanism |
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Application publication date: 20191231 |