CN113339468A

CN113339468A - Rigid variable-torque continuously variable transmission

Info

Publication number: CN113339468A
Application number: CN202110772256.4A
Authority: CN
Inventors: 金春磊; 谭万喜
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2021-09-03

Abstract

The invention discloses a rigid torque-conversion continuously variable transmission, and belongs to the technical field of transmissions. The device comprises a shell, an input shaft, an output shaft, a speed changing frame, a speed changing gear, a locking gear pump, a centrifugal hammer and a first gear; the input shaft and the output shaft are coaxially arranged, the input shaft and the output shaft sequentially penetrate through the center of the speed changing frame and are rotatably connected with the speed changing frame, the input shaft and the output shaft are respectively sleeved with a second gear and a third gear, the second gear and the third gear are respectively meshed with the speed changing gear, and the speed changing gear is rotatably connected with the speed changing frame through a rotating shaft. The invention completely abandons the defect of friction transmission, adopts hydraulic self-control rigid stepless variable-torque, almost has no friction wearing parts, locks the speed changer at medium and high speed, has no any friction loss, has the characteristics of simple structure, small volume, low manufacturing cost, long service life, no complex electric control system and the like, and particularly can realize rigid variable-torque transmission of manual gears and stepless smooth speed change of CVT.

Description

Rigid variable-torque continuously variable transmission

Technical Field

The invention relates to a rigid torque-variable continuously variable transmission, and belongs to the technical field of transmissions.

Background

The current international universal speed changer comprises a manual gear, a double-clutch automatic gear, an AT automatic gear and CVT stepless speed change. The manual gear operation is complicated; the double-clutch transmission is heated and suspended, the structure is complex and the cost is high; the AT automatic gear has the problems of large loss, high oil consumption, untimely power and pause, and has a complex structure and high cost; CVT has the inherent defects of limited torque peak value and incapability of starting. The invention provides a rigid torque-conversion stepless speed changer which not only has rigid torque-conversion transmission of a manual gear, but also has stepless smooth speed change of a CVT.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the rigid torque-variable stepless speed changer solves the problems that the traditional speed changer is easy to strain, limited in torque peak value and high in cost.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

the stiff torque-changing continuously variable transmission comprises a shell, an input shaft, an output shaft, a speed changing frame, a speed changing gear, a locking gear pump, a centrifugal hammer and a first gear;

the input shaft and the output shaft are coaxially arranged, the input shaft and the output shaft sequentially penetrate through the center of the speed changing frame and are rotatably connected with the speed changing frame, a second gear and a third gear are respectively sleeved on the input shaft and the output shaft, the second gear and the third gear are both meshed with the speed changing gear, and the speed changing gear is rotatably connected with the speed changing frame through a rotating shaft and is used for torque transmission between the input shaft and the output shaft;

the locking gear pump is fixedly connected with the speed changing frame, one rotating shaft of the locking gear pump extends to the outside of the speed changing frame and is meshed with the first gear through the fourth gear, and the first gear is fixedly sleeved with the input shaft and used for driving the locking gear pump to pump oil;

the centrifugal hammer is arranged at an oil outlet of the locking gear pump and used for controlling the closing degree of an oil outlet valve of the locking gear pump.

As a preferred example, the second gear and the speed change gear are engaged in a gear ratio A: B, and the speed change gear and the third gear are engaged in a gear ratio C: D, wherein the value of A is less than the value of B and the value of C is less than the value of D.

As a preferred example, at least three speed change gears and lock-up gear pumps are provided.

As a preferable example, the number of the speed change gears and the number of the locking gear pumps are three, and the speed change gears and the locking gear pumps are sequentially arranged around the input shaft at intervals.

As a preferred example, the input shaft and the output shaft are coaxially and rotationally connected through a bearing.

As a preferred example, the direction in which the oil outlet valve is closed by the centrifugal hammer is the centrifugal force direction of the transmission frame.

As a preferred example, the centrifugal hammer is further provided with a torsion spring for resetting.

As a preferred example, the input shaft and the output shaft are both rotationally connected with the housing, and the rotational connection of the input shaft and the output shaft is provided with a rotational seal.

The invention has the beneficial effects that: the invention completely abandons the defect of friction transmission, adopts hydraulic self-control rigid stepless variable-torque, almost has no friction wearing parts, locks the speed changer at medium and high speed, has no any friction loss, has the characteristics of simple structure, small volume, low manufacturing cost, long service life, no complex electric control system and the like, and particularly can realize rigid variable-torque transmission of manual gears and stepless smooth speed change of CVT.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;

fig. 4 is a schematic cross-sectional view taken along line C-C of fig. 1.

In the figure: the device comprises a shell 1, an input shaft 2, a second gear 3, a first gear 4, a fourth gear 5, a lock gear pump 6, an oil outlet valve 7, a speed changing frame 8, a third gear 9, an output shaft 10, a speed changing gear 11 and a centrifugal hammer 12.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easy to understand, the invention is further described with reference to the specific drawings.

As shown in fig. 1 to 4, the moment-of-stiffness continuously variable transmission includes a housing 1, an input shaft 2, an output shaft 10, a transmission carrier 8, a speed change gear 11, a lock-up gear pump 6, a centrifugal hammer 12, and a first gear 4;

the input shaft 2 and the output shaft 10 are coaxially arranged, the input shaft 2 and the output shaft 10 sequentially penetrate through the center of the speed changing frame 8 and are rotatably connected with the speed changing frame 8, the input shaft 2 and the output shaft 10 are respectively sleeved with the second gear 3 and the third gear 9, the speed changing gear 11 comprises two groups of gears with different diameters and tooth numbers, the two groups of gears are integrally arranged and coaxially and are respectively meshed with the second gear 3 and the third gear 9, and the speed changing gear 11 is rotatably connected with the speed changing frame 8 through a rotating shaft and is used for torque transmission between the input shaft 2 and the output shaft 10;

the locking gear pump 6 comprises a pump cylinder and two meshing gears, oil is conveyed through the change of the working volumes of the two meshing gear pieces, the pump cylinder is installed on the speed change frame 8, a clearance groove is formed in the bottom of the pump cylinder, and an oil outlet and an oil inlet of the pump cylinder are both arranged in the clearance groove, so that the pump cylinder can be attached and arranged in the speed change frame 8, and the size of the speed change frame 8 is reduced;

the top cover of the pump cylinder replaces part of the top surface of the speed changing frame 8, so that the length of a rotating shaft extending out of the locking gear pump 6 is shortened, the bending strength of the rotating shaft is increased, the rotating shaft of the locking gear pump 6 extends to the outside of the speed changing frame 8 and is meshed with the first gear 4 through the fourth gear 5, and the first gear 4 is fixedly sleeved with the input shaft 2 and used for driving the locking gear pump 6 to pump oil;

the centrifugal hammer 12 is arranged at an oil outlet of the locking gear pump 6 and is used for controlling the closing degree of an oil outlet valve 7 of the locking gear pump, the oil outlet valve 7 is set to be a one-way valve and can not be only fed in and out, and the output 10 is larger than the input shaft 2 when the engine slides at a high speed and is used for locking when the engine idles.

The second gear 3 and the change gear 11 are engaged in a gear ratio A: B, and the change gear 11 and the third gear 9 are engaged in a gear ratio C: D, wherein the value A is smaller than the value B, and the value C is smaller than the value D. In the embodiment, taking the application to a small-sized vehicle as an example, if the number of teeth a is set to 10, the number of teeth B is set to 20, the number of teeth C is set to 12, the number of teeth D is set to 18, the speed ratio of the second gear 3 to the speed change gear 11 is 2:1, and the speed ratio of the speed change gear 11 to the second gear 9 is 3:2, then the transmission ratio of the input shaft 2 to the output shaft 10 is 3: 1;

taking the application to a large-sized heavy-duty vehicle as an example, if the tooth number A is set to 10, the tooth number B is set to 20, the tooth number C is set to 10, the tooth number D is set to 30, the speed ratio of the second gear 3 to the speed change gear 11 is 2:1, the speed ratio of the speed change gear 11 to the second gear 9 is 3:1, and the speed ratio of the input shaft 2 to the output shaft 10 is 6:1, the torque is greatly enhanced, and the heavy-duty vehicle is suitable for heavy-duty vehicles with large loads.

In order to maintain the stability and dynamic balance of the transmission, at least three speed change gears 11 and lock-up gear pumps 6 are provided. On a general small vehicle, three speed change gears 11 and three locking gear pumps 6 are arranged, the speed change gears 11 and the locking gear pumps 6 are sequentially arranged around the input shaft 2 at intervals, and the structural strength is enough to transmit the torsion of the input shaft 2; when the heavy-duty vehicle is used, the speed change gears 11 and the locking gear pumps 6 can be four or five, the speed change gears 11 and the locking gear pumps 6 are sequentially arranged around the input shaft 2 at intervals, and the upper limit of the transmission of the enhanced torque is set through more parts.

The input shaft 2 and the output shaft 10 are connected with each other in a coaxial rotation mode through bearings, the input shaft 2 and the output shaft 10 are guaranteed to be in a coaxial state all the time when the input shaft and the output shaft are used, and the stability of torque transmission is further enhanced.

The direction that the oil outlet valve 7 is closed by the centrifugal hammer 12 is the centrifugal force direction of the speed changing frame 8, the rotating speed of the speed changing frame 8 is continuously increased, the centrifugal hammer 12 rotates along with the rotation of the speed changing frame 8, the hammer head part is driven by the centrifugal force to drive the oil outlet valve 7 to move, the oil outlet on the locking gear pump 6 is gradually closed, and the hammer handle part of the centrifugal hammer 12 is also provided with a torsional spring for resetting, so that the centrifugal hammer 12 is reset at a low rotating speed.

Input shaft 2 and output shaft 10 all rotate with shell 1 and are connected, and the rotation junction of input shaft 2 and output shaft 10 all is provided with the rotation sealing member, and speed change frame 8 sets up to airtight container, and fluid is whole to be filled in speed change frame 8, and shell 1 parcel is in speed change frame 8, makes speed change frame 8 can the stable rotation on the one hand, and on the other hand has guaranteed the leakproofness that fluid used, prevents to leak.

The working principle is as follows: when the clutch linkage input shaft 2 is used for engaging power, the vehicle is driven to start from a static state and accelerate to a stable running state, in the process, the acceleration can be divided into two parts, one part is accelerated through meshing transmission among the input shaft 2, the speed change gear 11 and the output shaft 10, and the other part is flexibly accelerated through the speed change frame 8 and the locking gear pump 6. When starting, the initial state of the oil outlet of the lock-up gear pump 6 is a partially opened state, a certain pressure is kept at the oil outlet valve 7, so that the speed changing frame 8 stably rotates along with the third gear 9, the output shaft 10 is accelerated by the meshing transmission of the speed changing gear 11, and the transmission ratio between the input shaft 2 and the output shaft 10 is determined by the gear ratio among the speed changing gear 11, the second gear 3 and the third gear 9; with the continuous increase of the vehicle speed, the oil outlet valve 7 of the locking gear pump 6 is gradually closed under the driving of the centrifugal hammer 12, the pumping pressure (namely locking force) of the oil is increased gradually until the locking gear pump 6 is in a stop and lock state due to overlarge oil pressure, at the moment, the input shaft 2 is locked at the same speed with the speed change frame 8 through the first gear 4 and the locking gear pump 6, and the speed change frame 8 is locked at the same speed with the output shaft 10 through the speed change gear 11, so that the input shaft 2 and the output shaft 10 reach the speed ratio of 1:1, and the stepless speed change process is completed.

Besides the acceleration function during the whole speed change process, the transmission frame 8 has the main function of serving as a torque-conversion acceleration platform which is synchronously increased along with the increase of the rotating speed of the output shaft 10, so that the vehicle can always accelerate by a rigid torque conversion of an instant input shaft 2 rotating speed minus the rotating speed of the output shaft 10 and then multiplied by a speed ratio. This torque-rigid acceleration becomes smaller as the input shaft 2 and the output shaft 10 approach the same speed, and ends when the output shaft 10 and the input shaft 2 approach the same speed. In the process, as the rotating speed of the speed changing frame 8 rises, the centrifugal hammer 12 gradually drives the oil outlet valve 7 to be closed, the locking force of the locking gear pump 6 becomes larger along with the continuous rise of the oil pressure, and finally the input shaft 2 and the speed changing frame 8 are locked at the same speed by adding the torsion force borne by the speed changing frame 8, and meanwhile, the speed changing frame 8 and the output shaft 10 are locked at the same speed, so that the whole rigid stepless speed changing process is completed.

The torque limit of the speed change can be obtained by expanding the system strength.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A torque-converter continuously variable transmission characterized by: the gear shifting mechanism comprises a shell (1), an input shaft (2), an output shaft (10), a gear shifting frame (8), a speed changing gear (11), a locking gear pump (6), a centrifugal hammer (12) and a first gear (4);

the input shaft (2) and the output shaft (10) are coaxially arranged, the input shaft (2) and the output shaft (10) sequentially penetrate through the center of the speed changing frame (8) and are rotatably connected with the speed changing frame (8), the input shaft (2) and the output shaft (10) are respectively sleeved with a second gear (3) and a third gear (9), the second gear (3) and the third gear (9) are respectively meshed with a speed changing gear (11), and the speed changing gear (11) is rotatably connected with the speed changing frame (8) through a rotating shaft and used for torque transmission between the input shaft (2) and the output shaft (10);

the locking gear pump (6) is fixedly connected with the speed changing frame (8), one rotating shaft of the locking gear pump (6) extends to the outside of the speed changing frame (8), is meshed with the first gear (4) through the fourth gear (5), and the first gear (4) is fixedly sleeved with the input shaft (2) and used for driving the locking gear pump (6) to pump oil;

the centrifugal hammer (12) is arranged at an oil outlet of the locking gear pump (6) and used for controlling the closing degree of an oil outlet valve (7) of the locking gear pump.

2. The torque-converting continuously variable transmission according to claim 1, characterized in that: the second gear (3) and the speed change gear (11) are meshed according to a gear ratio A: B, and the speed change gear (11) and the third gear (9) are meshed according to a gear ratio C: D, wherein the value A is smaller than the value B, and the value C is smaller than the value D.

3. The torque-converting continuously variable transmission according to claim 1, characterized in that: the speed change gears (11) and the locking gear pump (6) are at least three.

4. The torque-converting continuously variable transmission according to claim 3, characterized in that: change gear (11) and locking gear pump (6) all are provided with threely, change gear (11) and locking gear pump (6) alternate in proper order encircle the setting around input shaft (2).

5. The torque-converting continuously variable transmission according to claim 1, characterized in that: the input shaft (2) and the output shaft (10) are coaxially and rotationally connected through a bearing.

6. The torque-converting continuously variable transmission according to claim 1, characterized in that: the direction of the centrifugal hammer (12) for closing the oil outlet valve (7) is the centrifugal force direction of the speed changing frame (8).

7. The torque-converting continuously variable transmission according to claim 6, characterized in that: the centrifugal hammer (12) is also provided with a torsion spring for resetting.

8. The torque-converting continuously variable transmission according to claim 1, characterized in that: the input shaft (2) and the output shaft (10) are rotatably connected with the shell (1), and rotary sealing parts are arranged at the rotating connection positions of the input shaft (2) and the output shaft (10).