A method for detecting the levelness of assembly of master and slave pulleys of a continuously variable transmission

Abstract

The invention discloses a method for detecting the assembly levelness of a master and slave pulley of a continuously variable transmission, comprising: step one: placing a tail housing of the continuously variable transmission on a supporting base for assembling the transmission; step two: then installing a driving pulley assembly and a transmission pulley assembly on the tail housing of the continuously variable transmission; step three: inserting a first detection tool and a second detection tool between the belt reels of the driving pulley assembly and the driven pulley assembly respectively; step four: rotating the driving pulley and the driven pulley assembly again, so that the first detection tool and the second detection tool partially overlap and intersect, if partial overlap cannot be achieved, adjusting the levelness between the driving pulley assembly and the driven pulley assembly, if overlap is possible, using a feeler gauge to detect the gap between the first detection tool and the second detection tool; step five: adjusting the levelness of the driving pulley and the driven pulley assembly according to a set levelness error according to the gap obtained by the detection, until the levelness reaches within the set levelness error range.

Description

Technical Field

[0001] The invention relates to the technical field of level detection of master and slave pulleys of a continuously variable transmission, in particular to a method for detecting assembly level of master and slave pulleys of a continuously variable transmission. Background Art

[0002] The continuously variable transmission is a type of automatic transmission. Its general transmission principle is to achieve a continuously variable transmission ratio by changing the effective transmission diameter of the master and slave pulleys while keeping the center distance unchanged. During the manufacturing process, the main engine manufacturer first installs the master and slave pulleys and the transmission steel belt assembly on the gearbox middle shell. The shape and position tolerance of the pulley seat on the middle shell ensures that the levelness of the steel belt with the four master and slave pulleys is kept within the standard, thereby avoiding the steel belt from being at a certain angle with the pulley due to non-level assembly, resulting in eccentric wear, which eventually causes the gearbox to slip, stall, or even stop.

[0003] In the aftermarket, the CVT remanufacturing process is to first fix the master and slave pulley components containing the steel belt to the tail housing with bolts, and then buckle the assembled tail housing and pulley components on the gearbox middle housing. Due to the strength of the upper bolts, the steel belt and pulley may not be assembled level, which will eventually lead to gearbox failure. The traditional method is to use a depth gauge to measure the height of the housing from the upper edge of the master and slave pulleys, which is cumbersome and inaccurate with large errors.

[0004] Therefore, there is still room for improvement and development of the existing technology. Summary of the invention

[0005] The purpose of the present invention is to provide a method for detecting the assembly level of a continuously variable transmission master and slave pulleys, aiming to solve the technical problem that the level detection between the driving pulley assembly and the driven pulley assembly of the existing continuously variable transmission is not accurate enough, resulting in wear of the transmission steel belt.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a method for detecting the assembly level of the master and slave pulleys of a continuously variable transmission, and the specific steps are as follows:

[0007] Step 1: Now place the tail housing of the CVT on the support base of the assembled transmission;

[0008] Step 2: Then install the driving pulley assembly and the transmission pulley on the tail housing of the CVT;

[0009] Step 3: insert the first detection tool between the belt reels of the driving pulley assembly, and insert the second detection tool between the belt reels of the driven pulley assembly;

[0010] Step 4: Rotate the driving pulley assembly and the driven pulley assembly again to make the first gauge and the second gauge partially overlap and intersect. If the first gauge and the second gauge cannot partially overlap, it is necessary to adjust the levelness between the driving pulley assembly and the driven pulley assembly. If the first gauge and the second gauge can overlap, use a feeler gauge to detect the gap between the first gauge and the second gauge.

[0011] Step 5: Adjust the gap between the first and second gauges according to the set level error; adjust by placing shims at the bottom of the driving pulley assembly and the driven pulley assembly, and then continue testing with a feeler gauge until the set level error range is reached.

[0012] In one embodiment, the upper side surface and the lower side surface of one end of the first gauge and the second gauge are both provided with a detection curved surface; the detection curved surface corresponds to the curved surface of the reel.

[0013] In one embodiment, the curved surface is formed by interpolating a plurality of inclined surfaces with an angle of 8-15 degrees.

[0014] In one embodiment, one end of the first gauge is provided with a locking end surface corresponding to the rotating shaft of the driving pulley assembly, and the other end of the first gauge is provided with a first step portion, and the thickness of the first step portion is half of the thickness of the first gauge itself.

[0015] In one embodiment, one end of the second gauge is provided with a locking end surface corresponding to the rotating shaft of the driven pulley assembly, and the other end of the second gauge is provided with a second step portion, and the thickness of the second step portion is half of the thickness of the second gauge itself.

[0016] In one embodiment, when the first gauge and the second gauge are respectively inserted into the driving pulley assembly and the driven pulley assembly in step three, the first step portion and the second step portion are in opposite directions.

[0017] In one embodiment, the detection curved surface of the first inspection tool in step three is inserted between the belt reels of the driving pulley assembly, and the detection curved surface and the curved surface of the belt reels are matched with each other.

[0018] In one embodiment, the detection curved surface of the second inspection tool in step three is inserted between the reels of the driven pulley assembly, and the detection curved surface and the curved surface of the reels fit each other.

[0019] In one embodiment, the feeler gauge is composed of a plurality of test sheets with different thicknesses.

[0020] Beneficial effects: The present invention first places the tail housing of the gearbox on the supporting base, then installs the driving pulley assembly and the driven pulley assembly on the tail housing of the gearbox, and then inserts the first inspection fixture and the second inspection fixture between the two belt reels of the driving pulley assembly and between the two belt reels of the driven pulley assembly, and the ends of the first inspection fixture and the second inspection fixture respectively abut against the transmission shaft; thereby detecting whether the center lines of the respective belt reels of the driving pulley assembly and the driven pulley assembly are located at the same horizontal height, so that the transmission direction section of the transmission steel belt is perpendicular to the axis of the transmission shaft, which can prevent the transmission steel belt from rubbing against the belt reel and prevent the wear of the steel belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a step flowchart of the present invention.

[0022] Figure 2 It is a test schematic diagram of the present invention.

[0023] Figure 3 It is a perspective view of the first checking tool of the present invention.

[0024] Figure 4 It is a perspective view of the second checking tool of the present invention.

[0025] Figure 5 It is an isometric view of the first inspection tool of the present invention in the second direction.

[0026] Figure 6 This is an isometric view of the second inspection tool of the present invention in the second direction.

[0027] Figure 7 It is a schematic diagram of the feeler gauge of the present invention.

[0028] In the figure: 1, tail housing; 2, support base; 3, driving pulley assembly; 4, driven pulley assembly; 5, first inspection fixture; 6, second inspection fixture; 7, reel; 8, detection curved surface; 9, positioning end surface; 10, feeler gauge; 11, short plane; 12, first long plane; 13, second long plane; 21, support positioning column; 50, first step portion; 60, second step portion; 100, test sheet. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clear and explicit, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0030] like Figure 1-7 As shown, the present invention discloses a method for detecting the assembly level of a master and slave pulley of a continuously variable transmission, and the specific steps are as follows:

[0031] Step 1: Place the tail housing 1 of the continuously variable transmission on the supporting base 2 of the assembled transmission;

[0032] Step 2: Then install the driving pulley assembly 3 and the transmission pulley 4 on the tail housing 1 of the continuously variable transmission;

[0033] Step 3: insert the first detection tool 5 between the belt reels 7 of the driving pulley assembly 3, and insert the second detection tool 6 between the belt reels 7 of the driven pulley assembly 4;

[0034] Step 4: Rotate the active pulley assembly 3 and the driven pulley assembly 4 again to make the first gauge 5 and the second gauge 6 partially overlap and intersect. If the first gauge 5 and the second gauge 6 cannot partially overlap, it is necessary to adjust the level between the active pulley assembly 3 and the driven pulley assembly 4. If the first gauge 5 and the second gauge 6 can overlap, use a feeler gauge 10 to detect the gap between the first gauge and the second gauge.

[0035] Step 5: The gap between the first inspection fixture 5 and the second inspection fixture 6 is adjusted according to the set level error; the adjustment is performed by placing shims at the bottom of the driving pulley assembly 3 and the driven pulley assembly 4, and then the test is continued with the feeler gauge 10 until the set level error range is reached.

[0036] The support base 2 is provided with four support positioning columns 21 , and the tail housing 1 is placed on the support positioning columns 21 .

[0037] The above-mentioned horizontality refers to: the horizontality of the centerline cross section of the steel belt in the transmission direction between the driving pulley assembly 3 and the driven pulley assembly 4.

[0038] After adopting the above structure, the assembly method of the continuously variable transmission of the present invention is opposite to the existing assembly method of the continuously variable transmission. The existing assembly method of the continuously variable transmission generally installs the driving pulley assembly 3 and the driven pulley assembly 4 on the middle shell (not shown) of the transmission; therefore, usually after measuring with a horizontal ruler, and then assembling other components, the rear shell of the transmission is turned over and installed, so the horizontality of the driving pulley assembly 3 and the driven pulley assembly 4 after debugging will change. However, the present invention can realize the assembly by reverse assembly, and the assembled driving pulley assembly 3 and the driven pulley assembly 4 are tested again, and then the rear shell 1 of the transmission is directly covered with the middle shell (not shown) and installed and fixed, so that the horizontality of the master and slave pulleys that have been tested will not be disturbed. In addition, the driving pulley assembly 3 and the driven pulley assembly 4 of the present invention are respectively inserted between the belt disk 7 of the driving pulley assembly 3 and the belt disk 7 of the driven pulley assembly 4 through the first inspection fixture 5 and the second inspection fixture 6. Since both the driving pulley assembly 3 and the driven pulley assembly 4 include a transmission shaft and a belt reel 7 disposed on both sides of the transmission shaft, and the belt reel on the side close to the transmission shaft is a curved surface gradually extending outward from the transmission shaft to the edge of the belt reel 7. Therefore, the first inspection fixture and the second inspection fixture are inserted between the two belt reels of the driving pulley assembly and between the two belt reels of the driven pulley assembly, and the ends of the first inspection fixture 5 and the second inspection fixture 6 are respectively abutted on the transmission shaft. Therefore, it is more convenient to detect the levelness of the driving pulley assembly 3 and the driven pulley assembly 4 by the first inspection fixture 5 and the second inspection fixture 6, and it is simpler to measure the levelness. Moreover, by detecting the levelness by the feeler gauge 10, the maximum error of the levelness can be reduced to within the range of 0.2 mm. Compared with the existing levelness detection of the driving pulley assembly 3 and the driven pulley assembly 4, the error of 1.0 mm is more accurate.

[0039] Specifically, the upper and lower sides of one end of the first and second gauges 5 and 6 are provided with detection curved surfaces 8; the detection curved surface 8 corresponds to the curved surface of the reel 7; and a short plane 11 is provided on the outer edge of the bottom detection curved surface 8.

[0040] Since the first and second inspection jigs 5 and 6 are provided with inspection curved surfaces 8, the curved surfaces inserted between the belt reels 7 can be directly matched, and the horizontality of the driving pulley assembly 3 and the driven pulley assembly 4 can be compared by simply rotating the first and second inspection jigs 5 and 6.

[0041] Specifically, the curved surface is formed by interpolating a plurality of inclined surfaces with an angle of 8-15 degrees.

[0042] Specifically, one end of the first gauge 5 is provided with a locking end face 9 corresponding to the rotating shaft of the driving pulley assembly 3, and the other end of the first gauge 5 is provided with a first step portion 50, and the thickness of the first step portion 50 is half of the thickness of the first gauge 5. The surface of the first step portion 50 is a first long plane 12. The locking end face 9 is a concave cylindrical wall surface.

[0043] Specifically, one end of the second gauge 6 is provided with a locking end surface 9 corresponding to the rotating shaft of the driven pulley assembly 4, and the other end of the second gauge 6 is provided with a second step portion 60, the thickness of which is half of the thickness of the second gauge 6. The surface of the second step portion 60 is a second long plane 13.

[0044] Since the width of the belt reel 7 between the driving pulley assembly 3 and the driven pulley assembly 4 is inconsistent, when the first gauge 5 and the second gauge 6 are respectively inserted into the driving pulley assembly 3 and the driven pulley assembly 4, the directions of the step portions on the first gauge 5 and the second gauge 6 are opposite. By rotating the driving pulley assembly 3 or the driven pulley assembly 4, the step portions of the first gauge 5 and the second gauge 6 can be fitted to each other. At this time, the transmission steel belt can be horizontally set between the driving pulley assembly 3 and the driven pulley assembly 4.

[0045] When the first gauge 5 is inserted between the reels 7 of the active pulley assembly, the clamping end face 9 of the first gauge 5 abuts against the transmission axis surface of the active pulley assembly 3; the short plane 11 is at the outer edge of the reel 7; when the second gauge 6 is inserted between the reels 7 of the driven pulley assembly, the clamping end face 9 of the second gauge 6 abuts against the transmission axis surface of the driven pulley assembly 4; the short plane 11 of the second gauge 6 is at the outer edge of the reels 7 between the driven pulley assemblies; after the rear reel 7 is inserted, the first long plane 12 is parallel to the short plane 11; the second long plane 13 is parallel to the short plane.

[0046] Specifically, the thickness of the first gauge 5 is equal to the distance between the outermost points of the same vertical line on the inner wall of the belt reel 7 of the driving pulley assembly 3; the thickness of the second gauge 6 is equal to the distance between the outermost points of the same vertical line on the inner wall of the belt reel 7 of the driven pulley assembly 4.

[0047] Specifically, when the first gauge 5 and the second gauge 6 are respectively inserted into the driving pulley assembly 3 and the driven pulley assembly 4 in step 3, the first step portion 50 and the second step portion 60 are in opposite directions.

[0048] Specifically, in step 3, the detection curved surface 8 of the first inspection tool 5 is inserted between the belt reels 7 of the driving pulley assembly 3, and the detection curved surface 8 and the curved surface of the belt reels 7 are matched with each other.

[0049] Specifically, in step 3, the detection curved surface 8 of the second inspection tool 6 is inserted between the belt reels 7 of the driven pulley assembly 4, and the detection curved surface 8 and the curved surface of the belt reels 7 fit each other.

[0050] Specifically, the feeler gauge 10 is composed of a plurality of test sheets 100 with different thicknesses.

[0051] The present invention first places the tail housing 1 of the gearbox on the supporting base 2, and then installs the driving pulley assembly 3 and the driven pulley assembly 4 on the tail housing 1 of the gearbox, and then inserts the first inspection fixture 5 and the second inspection fixture 6 between the two belt reels 7 of the driving pulley assembly 3 and between the two belt reels 7 of the driven pulley assembly 4, and the ends of the first inspection fixture 5 and the second inspection fixture 6 are respectively abutted on the transmission shaft; thereby detecting whether the center lines of the respective belt reels of the driving pulley assembly 3 and the driven pulley assembly 4 are located at the same horizontal height, so that the transmission direction section where the transmission steel belt is located is perpendicular to the axis of the transmission shaft, so that the transmission steel belt can be prevented from rubbing against the belt reel 7 and the wear of the steel belt can be prevented.

[0052] The above are only preferred implementation modes of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for technicians in this technical field, any modification or equivalent replacement of the technical solution of the present invention without creative work does not depart from the protection scope of the technical solution of the present invention.

Claims

1. A method for detecting the assembly level of the master and slave pulleys of a continuously variable transmission, characterized in that , the specific steps are as follows: Step 1: Now place the tail housing of the CVT on the support base of the assembled transmission; Step 2: Then install the driving pulley assembly and the transmission pulley on the tail housing of the CVT; Step 3: insert the first detection tool between the belt reels of the driving pulley assembly, and insert the second detection tool between the belt reels of the driven pulley assembly; Step 4: Rotate the driving pulley assembly and the driven pulley assembly again to make the first gauge and the second gauge partially overlap and intersect. If the first gauge and the second gauge cannot partially overlap, it is necessary to adjust the levelness between the driving pulley assembly and the driven pulley assembly. If the first gauge and the second gauge can overlap, use a feeler gauge to detect the gap between the first gauge and the second gauge. Step 5: The gap between the first and second gauges is adjusted according to the set level error; the gap is adjusted by placing a gasket at the bottom of the driving pulley assembly and the driven pulley assembly, and then the feeler gauge is used to continue testing until the level error is within the set level error range; The upper side surface and the lower side surface of one end of the first and second inspection tools are both provided with detection curved surfaces; the detection curved surfaces correspond to the curved surfaces of the reels; The curved surface is formed by interpolation of a number of inclined planes with an angle of 8-15 degrees; One end of the first gauge is provided with a clamping end surface corresponding to the rotating shaft of the driving pulley assembly, and the other end of the first gauge is provided with a first step portion, and the thickness of the first step portion is half of the thickness of the first gauge itself; One end of the second gauge is provided with a locking end surface corresponding to the rotating shaft of the driven pulley assembly, and the other end of the second gauge is provided with a second step portion, and the thickness of the second step portion is half of the thickness of the second gauge itself; When the first inspection tool and the second inspection tool are respectively inserted into the driving pulley assembly and the driven pulley assembly in step 3, the first step portion and the second step portion are in opposite directions; The detection curved surface of the first inspection tool in step 3 is inserted between the reels of the active pulley assembly, and the detection curved surface and the curved surface of the reel are matched with each other; In the step 3, the detection curved surface of the second inspection tool is inserted between the reels of the driven pulley assembly, and the detection curved surface and the curved surface of the reel are matched with each other; The feeler gauge is composed of a plurality of test sheets with different thicknesses.

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