Steel belt circumference correction device and correction method for continuously variable transmission

Abstract

The application discloses a kind of steel band perimeter correction device and correction method of continuously variable transmission, including being arranged on workbench horizontal base plate, left fixed roller being arranged on the left part of horizontal base plate upper surface, right fixed roller being arranged on the right part of horizontal base plate upper surface, lifting roller being arranged on horizontal base plate;Lifting roller includes the first circular arc shape peripheral surface of middle part outward arc type arching;Left fixed roller and right fixed roller all include the second circular arc shape peripheral surface of middle part outward arc type arching;The radius of first circular arc shape peripheral surface and second circular arc shape peripheral surface is R;First circular arc shape peripheral surface is equipped with a plurality of first pressure sensors distributed uniformly on it.The application has the characteristics that the circumference of steel ring can be calculated in real time during the process of steel ring correction, so that the circumference of steel ring can be closer to the expected value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel belt perimeter size correction, in particular to a steel belt perimeter correction device and correction method of a continuously variable transmission. BACKGROUND

[0002] The gearbox is one of the most important components in the automobile transmission system. The CVT gearbox has gradually gained market recognition for its unique engine working efficiency, over-speed gear low speed, continuous smooth acceleration, and technical advantages in production cost and installation. More and more automobile manufacturers begin to use CVT; data shows that by 2016, there are more than 10 million CVT vehicles in the global market, more than 60 CVT models in the global market, and they are widely used in gasoline, diesel and hybrid power.

[0003] With the increasing demand for gearbox torque, the CVT gearbox using pressure steel belt for torque transmission has become the mainstream gearbox at present and in the future. At present, except for Audi which uses multitronic continuously variable transmission (i.e. V-shaped friction plate chain type continuously variable transmission), the rest all use pressure steel belt type CVT continuously variable transmission.

[0004] The pressure steel belt is a key component of the continuously variable transmission. This product is not currently manufactured in China, and the manufacturing technology of this type of pressure steel belt has not been mastered in China, resulting in the fact that Chinese CVT gearbox enterprises all need to purchase the pressure steel belt of this company, and the price of the pressure steel belt is very high.

[0005] The pressure steel belt is the core component of the continuously variable transmission, which largely determines the torque and durability of the gearbox. The pressure steel belt of the continuously variable transmission is composed of hundreds of steel sheets in contact with each other and two groups of steel sleeve rings nested on both sides of each steel sheet, which are composed of multiple layers of steel rings stacked together. When working, each steel sheet is tightened by the tension of the steel ring, and the torque is transmitted by the thrust between the steel sheets.

[0006] The working condition of the steel ring is very demanding. The steel ring needs to be bent around the two cone pulleys of the gearbox under a tensile stress of up to 600 MPa, which is similar to the bending of a V-belt around the cone pulley. After passing through the cone pulley, it is straightened again. When bending, a stress difference is formed between the inner and outer surfaces of the steel ring. In order to minimize the fatigue load caused by the stress difference, the thickness of the steel ring is often very thin, often less than 0.2 mm. Due to the insufficient strength of a single steel ring, multiple layers of steel rings are usually used to ensure that the entire steel ring can withstand sufficient tension. The steel ring is precisely matched after being nested by the slight perimeter difference between the layers, so that the stress between each steel ring is balanced. Therefore, the perimeter of the steel ring needs to be precisely controlled during manufacturing, and the error of the perimeter control precision needs to be less than 0.1 mm.

[0007] The process of manufacturing the steel ring is as follows: first, a steel plate such as a martensitic age steel is welded into a tubular shape, then the tubular sample is cut into a thick ring, the thick ring is ringed to form a thin ring, and due to the fact that the length precision cannot be accurately controlled during rolling, there is a problem that the length precision does not meet the precision requirement of multi-layer stacking; in addition, there is a problem that the steel ring is unevenly bent and deformed due to uneven rolling, that is, the steel ring is not round when naturally placed flat, and there is also a problem that the multi-layer stacking is not close enough and is easy to be separated.

[0008] The existing perimeter correction device includes a perimeter correction roller and two fixed rollers, and the perimeter correction roller corrects the perimeter of the steel ring wound on the two fixed rollers; the existing problems are that the steel ring will be elastically deformed when being corrected, resulting in deviation from the expected value after the steel ring is processed, the steel ring is still not round after the perimeter correction, and the multi-layer stacking is easy to be separated SUMMARY

[0009] The application aims to overcome the deficiencies of the prior art and provide a steel belt perimeter correction device and correction method for a continuously variable transmission.

[0010] In order to achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0011] A steel belt perimeter correction device for a continuously variable transmission, the steel belt includes a plurality of steel sheets and two steel sleeve rings arranged side by side, each steel sleeve ring includes a plurality of steel rings successively sleeved from inside to outside; each steel sheet is arranged in a tight ring shape and is respectively clamped with the two steel sleeve rings; it includes a horizontal base plate arranged on a workbench, a left fixed roller arranged on the left part of the upper surface of the horizontal base plate, a right fixed roller arranged on the right part of the upper surface of the horizontal base plate, and a lifting roller arranged on the horizontal base plate; the lifting roller includes a first circular arc-shaped peripheral surface which is arched outward in the middle; the left fixed roller and the right fixed roller each include a second circular arc-shaped peripheral surface which is arched outward in the middle; the radius of the first circular arc-shaped peripheral surface and the second circular arc-shaped peripheral surface is R; a plurality of first pressure sensors are arranged on the first circular arc-shaped peripheral surface; a driving motor is arranged on the horizontal base plate to drive the right fixed roller to rotate clockwise; the horizontal base plate is connected with the lifting roller through a lifting mechanism; it further includes a display and a controller, and the controller is electrically connected with the driving motor, the lifting mechanism, the display and each first pressure sensor.

[0012] The left fixed roller and the right fixed roller each include a second circular arc-shaped peripheral surface, and the lifting roller has a first circular arc-shaped peripheral surface, so that the perimeter correction and the arc forming can be completed at the same time, and the work efficiency is improved.

[0013] The application has simple structure and various functions, each roller only performs one action (moving or rolling), and can complete the actions of stretching, correcting and arc drawing.

[0014] As preferred, the lifting mechanism comprises a fixed plate arranged at the rear part of the upper surface of the horizontal base plate, two vertical sliding rails arranged on the front surface of the fixed plate, and a lifting motor arranged at the lower part of the front surface of the fixed plate; the rotating shaft of the lifting motor is connected with a connecting sleeve through a vertical screw rod, the connecting sleeve is connected with the two vertical sliding rails through two sliding blocks respectively, and the connecting sleeve is further connected with an upper connecting plate for mounting the lifting roller; the lifting motor is electrically connected with the controller.

[0015] The lifting motor can drive the connecting sleeve to lift along the two vertical sliding rails, thereby driving the lifting roller to lift, and meeting the need of the circumference correction of the steel ring.

[0016] As preferred, two longitudinal rails are arranged on the workbench at the front side of the horizontal base plate, a machine base is arranged on the two longitudinal rails in sliding connection with the two longitudinal rails, and two roundness correction rollers are arranged at the rear side of the machine base; the lifting roller further comprises a first circular annular surface located at the front side of the first circular arc surface, and an annular partition plate is arranged between the first circular arc surface and the first circular annular surface; the left fixed roller and the right fixed roller each further comprise a second circular annular surface located at the front side of the second circular arc surface, and a circular partition ring is arranged between the second circular arc surface and the second circular annular surface; the roundness correction roller comprises a third circular annular surface; the radius of the second circular annular surface is R, the radius of the first circular annular surface and the third circular annular surface is r, and R>r; a plurality of second pressure sensors are arranged on the first circular annular surface in uniform distribution, and each second pressure sensor is electrically connected with the controller.

[0017] The arrangement of the two longitudinal rails facilitates the forward and backward pushing and pulling of the machine base, thereby facilitating the adjustment of the positions of the two roundness correction rollers, so that the present application is convenient for roundness correction, or is used for circumference correction and arc surface formation.

[0018] Therefore, the present application has simple structure, multiple functions, and strong practicability.

[0019] As preferred, two horizontal rails are arranged at the left part of the upper surface of the horizontal base plate, a left fixed seat is arranged on the two horizontal rails in sliding connection with the two horizontal rails, and the left fixed roller is located at the front side of the left fixed seat.

[0020] In the process of the circumference correction and the roundness correction of the steel ring, the distance between the left fixed roller and the right fixed roller is fixed, and the arrangement of the two horizontal rails facilitates the adjustment of the distance between the left fixed roller and the right fixed roller before the correction operation.

[0021] As preferred, the bending degree d of the first circular arc surface, the second circular arc surface and the third circular annular surface is in the range of 0.1-0.3.

[0022]

[0023] Wherein, b is the thickness of the steel ring.

[0024] A correction method of a steel belt circumference correction device of a continuously variable transmission, comprising the following steps:

[0025] Step 1, the worker puts the steel ring on the second circular arc surface of the left and right fixed rollers and the first circular arc surface of the lifting roller, and controls the lifting motor to drive the vertical screw to rotate through the controller, so that the steel ring on the left fixed roller, the right fixed roller and the lifting roller is tensioned, and the controller calculates the tensioned vertical distance h1 of the axis of the lifting roller to the line connecting the axes of the left fixed roller and the right fixed roller according to the initial vertical distance h0 of the line connecting the axes of the left fixed roller and the right fixed roller to the axis of the lifting roller and the lead of the vertical screw when the steel ring is tensioned;

[0026] Step 2, the worker inputs the desired metal ring circumference value Cq and selects the moving speed V of the lifting roller in the controller, and inputs the cross-sectional area A of the metal ring; the controller controls the driving motor to work, so that the right fixed roller rotates, and the steel ring rotates on the left fixed roller, the right fixed roller and the lifting roller;

[0027] Step 3, the controller controls the vertical screw to rotate through the lifting motor, so that the connecting sleeve drives the lifting roller to move downward at the speed V, and the controller calculates the current vertical distance h of the axis of the lifting roller to the line connecting the axes of the left fixed roller and the right fixed roller at the current time t by h=h1+Vt; as the lifting roller moves downward, the steel ring plastically deforms, the circumference of the steel ring gradually increases, and the steel ring gradually becomes a shape with an outwardly curved arch in the middle;

[0028] Step 3-1, in the process of gradually increasing the circumference of the steel ring, the controller calculates the actual circumference value C of the steel ring at the current time by the following formula:

[0029] Calculate the ideal circumference C1 of the steel ring:

[0030]

[0031]

[0032] Wherein, L is the distance between the axes of the left fixed roller and the right fixed roller, C0 is the original circumference of the steel ring before correction, wherein, σ s is the yield strength of the steel ring;

[0033] Calculate the elastic deformation X of the steel ring:

[0034]

[0035] Wherein, F is the maximum value of the pressure values detected by all the first pressure sensors, and E is the Young's modulus of the steel ring;

[0036] Calculate C:

[0037] C=C1-X;

[0038] The display displays the current circumference C of the steel ring; step 4,

[0039] When 0.1mm<(Cq-C)≤0.5mm, the controller controls the moving speed of the lifting roller to be V / 10;

[0040] When (Cq-C)≤0.1mm, the controller controls the moving speed of the lifting roller to be V / 100;

[0041] When C=Cq, the controller controls the lifting roller to move upward to make the steel ring loose, then controls the lifting motor to stop working, controls the driving motor to slow down and stop working; after the left fixed roller, the right fixed roller and the lifting roller stop rotating, the steel ring is taken off from the left fixed roller, the right fixed roller and the lifting roller, and the circumference correction of the steel ring is finished.

[0042] The present application can automatically calculate the elastic variable of the steel ring under force, so that the actual circumference of the steel ring under no stress can be obtained more accurately, and over-correction can be avoided.

[0043] The lifting roller has a first circular-arc-shaped peripheral surface and a first circular-ring-shaped peripheral surface, and the left fixed roller and the right fixed roller each include a second circular-ring-shaped peripheral surface and a second circular-arc-shaped peripheral surface, so that the present application can complete the roundness correction, the circumference correction and the arc surface formation of the steel ring in sequence, and the work efficiency is improved.

[0044] When the circumference gradually approaches the expected value, the lifting roller can reduce its moving speed, so that the final circumference of the steel ring is closer to the expected value; by controlling the moving speed of the lifting roller, the correction accuracy can be controlled, and over-correction or too fast correction speed to increase the internal stress of the steel ring can be avoided.

[0045] The present application can process the cross section of the steel ring into a circular-arc cross section with the middle part bulging outward, so that after the steel rings are stacked, the edge circumference of the outer layer is smaller than the middle circumference of the adjacent inner layer, and the steel rings are not easy to be separated.

[0046] As preferred, two longitudinal rails are arranged on the workbench of the horizontal base plate, a machine base is arranged on the two longitudinal rails in sliding connection with the two longitudinal rails, and two roundness correction rollers are arranged on the rear side of the machine base; the lifting roller further comprises a first circular ring-shaped surface located on the front side of the first circular arc-shaped surface, and an annular partition plate is arranged between the first circular arc-shaped surface and the first circular ring-shaped surface; the left fixed roller and the right fixed roller each further comprise a second circular ring-shaped surface located on the front side of the second circular arc-shaped surface, and the roundness correction roller comprises a third circular ring-shaped surface; the radius of the second circular ring-shaped surface is R, the radius of the first circular ring-shaped surface and the third circular ring-shaped surface is r, and R>r; a plurality of second pressure sensors are arranged on the first circular ring-shaped surface in uniform distribution, and each second pressure sensor is electrically connected with the controller; and the process of roundness correction further comprises the following steps before step 1:

[0047] Step 01: The worker pushes the machine base backward, so that the two roundness correction rollers are located on the left upper side and the right upper side of the lifting roller, and the machine base is fixed on the two longitudinal rails;

[0048] Step 02: The worker puts the steel ring on the second circular ring-shaped surface of the left fixed roller and the right fixed roller and the third circular ring-shaped surface of the two roundness correction rollers, controls the lifting motor to drive the vertical screw to rotate through the controller, drives the lifting roller to lift through the vertical screw, and makes the first circular ring-shaped surface of the lifting roller contact the lower side of the steel ring;

[0049] Step 03: The controller controls the lifting motor to drive the connecting sleeve and the lifting roller to move vertically upward, so that the lifting roller presses the lower side of the steel ring upward;

[0050] When the maximum value of the pressure values detected by all the second pressure sensors reaches F1, the controller controls the lifting motor to stop working;

[0051]

[0052] Step 04: The controller controls the driving motor to work, and when the steel ring rotates several turns on the left fixed roller, the right fixed roller, the two roundness correction rollers and the lifting roller, the controller controls the driving motor to slow down and stop working, and the controller controls the lifting motor to drive the lifting roller to move vertically downward, so that the steel ring is loosened on each roller, and the steel ring is taken off each roller;

[0053] Step 05: The worker pushes the machine base forward along the two longitudinal rails, so that the two roundness correction rollers are away from the left upper side and the right upper side of the lifting roller.

[0054] After the steel ring is processed by the roundness correction, it is closer to a perfect circle, so that the stress is more uniform during work, failure is less likely to occur, and the service life is prolonged.

[0055] As preferred,

[0056] Therefore, the present application has the following advantages:

[0057] In the process of the steel ring correction, the circumference of the steel ring can be calculated in real time, and after the steel ring correction, the circumference of the steel ring can be closer to the expected value;

[0058] In the process of the arc correction of the steel ring, the cross section of the steel ring can be processed into an arc cross section with the middle part bulging outward, and after the multi-layered nesting of the steel rings, the edge circumference of the outer layer is smaller than the middle circumference of the adjacent inner layer, so that the steel ring is not easy to be separated;

[0059] After the roundness correction of the steel ring, the steel ring is closer to a perfect circle, so that the stress of the steel ring is more uniform during work, the steel ring is not easy to fail, and the service life of the steel ring is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0060] Figure 1 is a structural schematic diagram of the present application;

[0061] Figure 2 is a schematic diagram of the roundness correction of the present application;

[0062] Figure 3 is a top view of each roller during the roundness correction of the present application;

[0063] Figure 4 is a schematic diagram of the circumference correction of the present application;

[0064] Figure 5 is a top view of each roller during the circumference correction of the present application;

[0065] Figure 6 is a cross-sectional schematic diagram of the steel ring of the present application;

[0066] Figure 7 is a schematic diagram of the circumference calculation of the steel ring of the present application;

[0067] Figure 8 is a schematic diagram of the bending degree d of the present application;

[0068] Figure 9 is a structural schematic diagram of the lifting roller of the present application;

[0069] Figure 10 is a cross-sectional schematic diagram of the left fixed roller of the present application. DETAILED DESCRIPTION

[0070] The present application will be further described below in combination with the drawings and specific embodiments.

[0071] Example 1

[0072] As Figure 1The embodiment shown is a kind of steel band circumference correction device of continuously variable transmission, steel band includes a plurality of steel sheet and two left and right parallel steel loops, each steel loop includes a plurality of steel rings from inside to outside in turn;Each steel sheet is closely arranged in annular and is respectively clamped with two steel loops;Including set on workbench horizontal base plate 1, set on the left part of horizontal base plate upper surface left fixed roller 2, set on the right part of horizontal base plate upper surface right fixed roller 3, set on the lifting roller 4 of horizontal base plate;Lifting roller includes the first circular arc surface 41 of middle part outward arc type arch;Left fixed roller and right fixed roller all include the second circular arc surface 101 of middle part outward arc type arch;The radius of first circular arc surface and second circular arc surface is R;First circular arc surface is provided with a plurality of first pressure sensors distributed uniformly;Horizontal base plate is provided with driving motor 30 for driving right fixed roller clockwise rotation, horizontal base plate is connected with lifting roller through lifting mechanism;It also includes display and controller, controller is electrically connected with driving motor, lifting mechanism, display and each first pressure sensor.

[0073] Lifting mechanism includes fixed plate 11 set on the upper surface of horizontal base plate rear part, two vertical sliding rails 111 set on the front surface of fixed plate, lifting motor set on the lower part of front surface of fixed plate;The rotating shaft of lifting motor is connected with connecting sleeve 62 through vertical screw rod 61, connecting sleeve is connected with two vertical sliding rails through two sliding blocks 63 respectively, connecting sleeve is also connected with upper connecting plate 44 for installing lifting roller;Lifting motor is electrically connected with controller.

[0074] The left part of horizontal base plate upper surface is provided with two horizontal guide rails, and the left fixed seat is provided on the two horizontal guide rails and is slidably connected with the two horizontal guide rails, and the left fixed roller is located on the front side of the left fixed seat.

[0075] As Figure 8 The bending degree d of the first circular arc surface, the second circular arc surface and the third circular ring surface is as follows:

[0076]

[0077] Wherein, b is the thickness of the steel ring. Figure 8 Wherein, a is the width of the steel ring.

[0078] A correction method of a steel band circumference correction device of continuously variable transmission, comprising the following steps:

[0079] Step 1, as Figure 4As shown, the worker will put the steel ring on the second arc-shaped surface of the left and right fixed rollers and the first arc-shaped surface of the lifting roller, and the worker will control the lifting motor to drive the vertical screw to rotate, so that the connecting sleeve and the lifting roller are lowered, and the steel ring on the left and right fixed rollers and the lifting roller is tensioned, and the controller calculates the tensioned vertical distance h1 of the axis of the lifting roller from the line connecting the axes of the left and right fixed rollers according to the initial vertical distance h0 of the line connecting the axes of the left and right fixed rollers from the axis of the lifting roller and the lead of the vertical screw when the steel ring is tensioned.

[0080] Step 2, the worker inputs the desired metal ring circumference value Cq in the controller, selects the moving speed V of the lifting roller = 0.1 mm / s, and inputs the cross-sectional area A of the metal ring; the controller controls the driving motor to work, so that the right fixed roller rotates, and the steel ring rotates on the left and right fixed rollers and the lifting roller;

[0081] Step 3, starting from t = 0, the controller controls the vertical screw to rotate through the lifting motor, so that the connecting sleeve drives the lifting roller to move downward at a speed V, and the controller calculates the current vertical distance h of the axis of the lifting roller from the line connecting the axes of the left and right fixed rollers at the current time t by using h = h1 + Vt; as the lifting roller moves downward, the steel ring is plastically deformed, the circumference of the steel ring gradually increases, and the steel ring gradually becomes Figure 6 as shown, the shape of the middle part arching outward;

[0082] Step 3-1, in the process of gradually increasing the circumference of the steel ring, the controller calculates the actual circumference value C of the steel ring at the current time by using the following formula:

[0083] As shown in Figure 7 , the ideal circumference C1 of the steel ring is calculated:

[0084]

[0085]

[0086] Wherein, L is the distance between the axes of the left and right fixed rollers, C0 is the original circumference of the steel ring before correction, wherein, σ s is the yield strength of the steel ring;

[0087] The elastic deformation X of the steel ring is calculated:

[0088]

[0089] Wherein, F is the maximum value of all the pressure values detected by the first pressure sensor, and E is the Young's modulus of the steel ring;

[0090] C is calculated:

[0091] C=C1-X;

[0092] The display displays the current circumference C of the steel ring;

[0093] Step 4,

[0094] When 0.1mm<(Cq-C)≤0.5mm, the controller controls the moving speed of the lifting roller to be V / 10;

[0095] When (Cq-C)≤0.1mm, the controller controls the moving speed of the lifting roller to be V / 100;

[0096] When C=Cq, the controller controls the lifting roller to move upward to make the steel ring loose, then controls the lifting motor to stop working, controls the driving motor to slow down and stop working; after the left fixed roller, the right fixed roller and the lifting roller stop rotating, the steel ring is taken off from the left fixed roller, the right fixed roller and the lifting roller, and the circumference correction of the steel ring is completed.

[0097] The steel rings with multiple circumference sizes arranged from small to large and all corrected are sleeved together to form a steel sleeve ring, and the multiple steel sheets are arranged in a close annular manner along the two steel sleeve rings and are respectively clamped with the two steel sleeve rings, thus forming a steel belt of the continuously variable transmission, so that the circumference of the steel belt is corrected by correcting the circumference of the steel ring.

[0098] Embodiment 2

[0099] Embodiment 2 includes all the structural and method contents of embodiment 1, and additionally, embodiment 2 further includes the following contents:

[0100] As shown in Figure 1 , Figure 9 , Figure 10 , the workbench on the front side of the horizontal base plate is provided with two longitudinal guide rails 7, the two longitudinal guide rails are provided with a machine base 71 in sliding connection with the two longitudinal guide rails, and the rear side of the machine base is provided with two roundness correction rollers 5; the lifting roller further includes a first circular annular surface 42 located on the front side of the first circular arc surface, and an annular partition plate 43 is arranged between the first circular arc surface and the first circular annular surface; the left fixed roller and the right fixed roller further include a second circular annular surface 102 located on the front side of the second circular arc surface, and a circular partition ring 103 is arranged between the second circular arc surface and the second circular annular surface; the roundness correction roller includes a third circular annular surface; the radius of the second circular annular surface is R, the radius of the first circular annular surface and the third circular annular surface is r, and R>r;

[0101] The first circular annular surface is provided with a plurality of second pressure sensors uniformly distributed, and each second pressure sensor is electrically connected with the controller.

[0102] Before step 1 of embodiment 1, a roundness correction process is further included:

[0103] Step 01, the operator pushes the machine seat backward, so that the two roundness correction rollers are located at the left upper side and the right upper side of the lifting roller as shown in the figure, and the machine seat is fixed on the two longitudinal rails; Figure 3

[0104] Step 02, as shown in the figure, the operator puts the steel ring 6 on the second circular surface of the left fixed roller and the right fixed roller and the third circular surface of the two roundness correction rollers, controls the lifting motor to drive the vertical screw to rotate through the controller, and the vertical screw drives the lifting roller to rise and fall, so that the first circular surface of the lifting roller is in contact with the lower side of the steel ring; Figure 2

[0105] Step 03, the controller controls the lifting motor to drive the connecting sleeve and the lifting roller to move vertically upward, so that the lifting roller presses the lower side of the steel ring upward;

[0106] When the maximum value of the pressure values detected by all the second pressure sensors reaches F1, the controller controls the lifting motor to stop working;

[0107]

[0108] Step 04, the controller controls the driving motor to work, and when the steel ring rotates 6 times on the left fixed roller, the right fixed roller, the two roundness correction rollers and the lifting roller, the controller controls the driving motor to stop working after deceleration, and the controller controls the lifting motor to drive the lifting roller to move vertically downward, so that the steel ring is loosened on each roller, and the steel ring is taken off from each roller;

[0109] Step 05, as shown in the figure, the operator pushes the machine seat along the two longitudinal rails forward, so that the two roundness correction rollers are away from the left upper side and the right upper side of the lifting roller. Figure 5

[0110] The above only describes the preferred embodiments of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.​​​

Claims

1. A steel belt circumference correction device for a continuously variable transmission (CVT), wherein the steel belt comprises a plurality of steel plates and two steel collars arranged side by side, each steel collar comprising a plurality of steel rings sequentially fitted from the inside out; the steel plates are arranged in a tight ring and respectively engage with the two steel collars; characterized in that, The application relates to a horizontal base plate (1) arranged on a workbench, a left fixed roller (2) arranged on the left part of the upper surface of the horizontal base plate, a right fixed roller (3) arranged on the right part of the upper surface of the horizontal base plate, and a lifting roller (4) arranged on the horizontal base plate; the lifting roller comprises a first circular-arc-shaped peripheral surface (41) which is outwardly arched in the middle; the left fixed roller and the right fixed roller each comprise a second circular-arc-shaped peripheral surface (101) which is outwardly arched in the middle; the radius of the first circular-arc-shaped peripheral surface and the radius of the second circular-arc-shaped peripheral surface are R; a plurality of first pressure sensors are arranged on the first circular-arc-shaped peripheral surface; a driving motor (30) is arranged on the horizontal base plate and used for driving the right fixed roller to rotate clockwise; the horizontal base plate is connected with the lifting roller through a lifting mechanism; the application further comprises a display and a controller; the controller is electrically connected with the driving motor, the lifting mechanism, the display and each first pressure sensor; the lifting mechanism comprises a fixed plate (11) arranged on the rear part of the upper surface of the horizontal base plate, two vertical sliding rails (111) arranged on the front surface of the fixed plate, and a lifting motor arranged on the lower part of the front surface of the fixed plate; the rotating shaft of the lifting motor is connected with a connecting sleeve (62) through a vertical screw rod (61); the connecting sleeve is connected with two sliding blocks (63) and two vertical sliding rails respectively; the connecting sleeve is further connected with an upper connecting plate (44) used for mounting the lifting roller; the lifting motor is electrically connected with the controller; two longitudinal rails (7) are arranged on the workbench on the front side of the horizontal base plate; a machine base (71) is arranged on the two longitudinal rails and is in sliding connection with the two longitudinal rails; two roundness correction rollers (5) are arranged on the rear side of the machine base; the lifting roller further comprises a first circular-ring-shaped peripheral surface (42) arranged on the front side of the first circular-arc-shaped peripheral surface; an annular partition plate (43) is arranged between the first circular-arc-shaped peripheral surface and the first circular-ring-shaped peripheral surface; the left fixed roller and the right fixed roller each further comprise a second circular-ring-shaped peripheral surface (102) arranged on the front side of the second circular-arc-shaped peripheral surface; a circular partition ring (103) is arranged between the second circular-arc-shaped peripheral surface and the second circular-ring-shaped peripheral surface; the roundness correction roller comprises a third circular-ring-shaped peripheral surface; the radius of the second circular-ring-shaped peripheral surface is R, the radius of the first circular-ring-shaped peripheral surface and the radius of the third circular-ring-shaped peripheral surface are r, and R>r; a plurality of second pressure sensors are arranged on the first circular-ring-shaped peripheral surface and are in electrical connection with the controller.

2. The steel belt circumference correcting device of a continuously variable transmission according to claim 1, characterized by, Two horizontal rails are arranged on the left part of the upper surface of the horizontal base plate; a left fixed seat is arranged on the two horizontal rails and is in sliding connection with the two horizontal rails; and the left fixed roller is arranged on the front side of the left fixed seat.

3. The steel belt circumference correcting device of a continuously variable transmission according to claim 1 or 2, characterized in that, The bending degree d of the first circular-arc-shaped peripheral surface, the second circular-arc-shaped peripheral surface and the third circular-ring-shaped peripheral surface is in the range of 0.5b to 2b. The application further comprises the following steps:

4. A method of correcting the circumference of a steel belt for a continuously variable transmission according to claim 1, characterized by, ​ Step 1, the staff puts the steel ring on the second circular arc surface of the left and right fixed rollers and the first circular arc surface of the lifting roller, and controls the lifting motor to drive the vertical screw to rotate, so that the lifting sleeve and the lifting roller are lowered, and the steel ring on the left and right fixed rollers and the lifting roller is tensioned, and the controller calculates the tensioned vertical distance h1 of the axis of the lifting roller to the line connecting the axes of the left and right fixed rollers according to the initial vertical distance h0 of the line connecting the axes of the left and right fixed rollers to the axis of the lifting roller and the lead of the vertical screw when the steel ring is tensioned. Step 2, the staff inputs the desired circumference value Cq of the metal ring in the controller, selects the moving speed V of the lifting roller, and inputs the cross-sectional area A of the metal ring; the controller controls the driving motor to work, so that the right fixed roller rotates, and the steel ring rotates on the left and right fixed rollers and the lifting roller; Step 3, the controller controls the vertical screw to rotate through the lifting motor, so that the lifting sleeve drives the lifting roller to move downward at the speed V, and the controller calculates the current vertical distance h of the axis of the lifting roller to the line connecting the axes of the left and right fixed rollers by h=h1+Vt; As the lifting roller moves downward, the steel ring plastically deforms, the circumference of the steel ring gradually increases, and the steel ring gradually becomes an arc shape with the middle part arching outward; Step 3-1, in the process of gradually increasing the circumference of the steel ring, the controller calculates the actual circumference value C of the steel ring at the current time by the following formula: Calculate the ideal circumference C1 of the steel ring: where L is the distance between the axes of the left and right fixed rollers, C0is the original circumference of the steel ring before correction, and σ s is the yield strength of the steel ring. Calculate the elastic deformation X of the steel ring: Wherein, F is the maximum value of all the pressure values detected by the first pressure sensor, and E is the Young's modulus of the steel ring; Calculate C: C=C1-X; The display displays the current circumference C of the steel ring; Step 4, When 0.1mm<(Cq-C)≤0.5mm, the controller controls the moving speed of the lifting roller to become V / 10; When (Cq-C)≤0.1mm, the controller controls the moving speed of the lifting roller to become V / 100; when C=Cq, the controller controls the lifting roller to move upward to loosen the steel ring, and then controls the lifting motor to stop working; the controller controls the driving motor to slow down and stop working; when the left and right fixed rollers and the lifting roller stop rotating, the steel ring is taken off from the left and right fixed rollers and the lifting roller, and the circumference correction of the steel ring is completed.

5. The correction method of the steel belt circumference correction device of a continuously variable transmission according to claim 4, characterized by Before step 1, the following roundness correction process is also included: Step 01, the staff pushes the machine seat backward, so that the two roundness correction rollers are located on the left upper side and the right upper side of the lifting roller, and the machine seat is fixed on the two longitudinal rails; Step 02, the staff puts the steel ring on the second circular surface of the left and right fixed rollers and the third circular surface of the two roundness correction rollers, and controls the lifting motor to drive the vertical screw to rotate, so that the vertical screw drives the lifting roller to lift, and the first circular surface of the lifting roller contacts the lower side of the steel ring; Step 03, the controller controls the lifting motor to drive the lifting sleeve and the lifting roller to move vertically upward, so that the lifting roller presses the lower side of the steel ring upward; When the maximum value of all the pressure values detected by the second pressure sensor reaches F1, the controller controls the lifting motor to stop working; Step 04, the controller controls the main motor to work, when the steel ring rotates several circles on the left fixed roller, the right fixed roller, the two roundness correction rollers and the lifting roller, the controller controls the main motor to slow down and stop working, the controller controls the lifting motor to drive the lifting roller to move vertically downward, so that the steel ring becomes loose on each roller, and the steel ring is taken off each roller; Step 05, the worker pushes the machine seat forward along the two longitudinal guide rails, so that the two roundness correction rollers move away from the left upper side and the right upper side of the lifting roller.

6. The correction method of the steel belt circumference correction device of the continuously variable transmission according to claim 5, characterized in that,

Images