Input drum assembly for improving performance of a 68rfe transmission, 68rfe transmission and method

Abstract

The present application relates to input drum assembly, 68RFE transmission and method for improving the performance of 68RFE transmission. The present application can improve the cooling and lubrication efficiency of the input drum assembly in the 68RFE transmission through the new input drum assembly and / or transmission housing; the installation space of the clutch plate and the clutch friction plate can be increased through the new input drum assembly, and then the thickness of the clutch plate 14 and the clutch friction plate can be increased or the number of the clutch plate and the clutch friction plate can be increased, finally the torque that the 68RFE transmission can bear can be increased; the overall strength of the transmission housing can be increased through the reinforcing ribs when the transmission housing is cast; the diameter of the input drum assembly can be increased through the cutting of the corresponding inner wall of the input drum assembly after the casting of the transmission housing, and then the diameter of the clutch plate and the clutch friction plate can be increased, finally the torque that the 68RFE transmission can bear can be increased.

Description

TECHNICAL FIELD

[0001] The present invention relates to the field of vehicle transmissions generally. In particular, the present invention relates to an input drum assembly for improving the performance of a 68RFE transmission, a 68RFE transmission and a method. BACKGROUND

[0002] Transmission, also known as gearbox, is a mechanism used to change the speed and torque of the engine, which can fix or change the transmission ratio of the output shaft and the input shaft in several steps. The input drum assembly in the clutch is an important component in the transmission. Figures 2-5 The conventional input drum assembly 100 is shown to include a clutch piston 11, a clutch retainer 12, a lower drive piston 13, a clutch plate 14, a clutch disc 15, a lower drive retainer plate 16, a wedge 17 and a clutch plate 18. The clutch plate 14 and the clutch disc 15 have several pieces.

[0003] In use, a large amount of heat is generated inside the input drum assembly due to friction. If this heat cannot be transmitted out of the input drum in time, the clutch disc 15 will overheat and deform, and in severe cases, it will form a wavy shape, causing the input drum assembly 100 to always be in a semi-clutch state. This condition will further exacerbate the slippage of the clutch disc 15 and generate heat. The overheating condition will cause the clutch disc 15 to burn and produce a large amount of carbon deposits, greatly reducing the friction coefficient and thus greatly reducing the torque that the transmission can withstand. In addition, the carbon particles enter other parts of the transmission with the cooling oil, causing blockage, pressure reduction, poor heat dissipation, etc., thereby greatly reducing the service life of the transmission.

[0004] The number of pieces, thickness or diameter of the clutch plate 14 and the clutch disc 15 are important factors that affect the torque that the input drum assembly can withstand. However, in the conventional input drum assembly, these three factors are difficult to change due to the structure of the input drum assembly and the transmission housing. Therefore, if the performance of the input drum assembly, the clutch or the transmission is to be improved, the existing structure needs to be improved. SUMMARY

[0005] In one aspect, the present invention relates to an input drum assembly for improving the performance of a 68RFE transmission, comprising a clutch retainer, a lower drive piston, a clutch plate, a clutch disc, a lower drive retainer plate and a clutch plate; further comprising a piston cap and a piston body, and a bolt for fixedly connecting the piston cap and the piston body; the lower drive piston, the clutch plate, the clutch disc and the lower drive retainer plate are arranged in the clutch retainer.

[0006] Based on the above scheme, the piston cap has a cap body that fits against the end face of the clutch retainer; the edge of the cap body extends circumferentially to form a lip with a certain width and thickness; several through holes for inserting bolts are provided on the lip.

[0007] Based on the above scheme, the piston body includes a cylindrical cylinder with several slots on the end face of the cylinder near the piston cap that are adapted to bolts and through holes; a retaining plate is formed at the end of the cylinder away from the piston cap; and a piston body slot is formed on the retaining plate.

[0008] Based on the above scheme, the piston cap and piston body, which are fixed together, are fitted onto the outside of the clutch retainer. At the same time, the positioning plate on the clutch retainer passes through the piston body groove on the piston body and finally engages and connects with the groove on the clutch pressure plate.

[0009] Based on the above scheme, a number of piston body oil holes are opened on the wall of the piston body cylinder; a number of retainer oil holes are opened on the wall of the clutch retainer, and the retainer oil holes correspond one-to-one with the piston body oil holes.

[0010] On the other hand, the present invention also relates to a 68RFE transmission, comprising: a transmission housing, a planetary gear set, and an input drum assembly, wherein the input drum assembly is a new input drum assembly, the new input drum assembly including a clutch retainer, a lower drive piston, a clutch disc, a clutch friction disc, a lower drive retaining plate, and a clutch pressure plate; further comprising a piston cap and a piston body, and bolts for fixing the piston cap and piston body together; wherein the lower drive piston, clutch disc, clutch friction disc, and lower drive retaining plate are disposed within the clutch retainer.

[0011] Based on the above scheme, the piston cap has a cap body that fits against the end face of the clutch retainer; the edge of the cap body extends circumferentially to form a lip with a certain width and thickness; several through holes for inserting bolts are provided on the lip.

[0012] Based on the above scheme, the piston body includes a cylindrical cylinder with several slots on the end face of the cylinder near the piston cap that are adapted to bolts and through holes; a retaining plate is formed at the end of the cylinder away from the piston cap; and a piston body slot is formed on the retaining plate.

[0013] Based on the above scheme, the piston cap and piston body, which are fixed together, are fitted onto the outside of the clutch retainer. At the same time, the positioning plate on the clutch retainer passes through the piston body groove on the piston body and finally engages and connects with the groove on the clutch pressure plate.

[0014] On the basis of the above scheme, a plurality of piston body oil holes are formed in the wall of the cylinder of the piston body; a plurality of retainer oil holes are formed in the wall of the clutch retainer, and the retainer oil holes correspond to the piston body oil holes one by one.

[0015] On the basis of the above scheme, a shell oil injection hole for inputting lubricating oil into the inside of the transmission shell and a shell oil outlet hole for outputting the input lubricating oil are arranged on the wall of the transmission shell.

[0016] On the basis of the above scheme, the shell oil injection hole corresponds to the position of the input drum assembly, and the shell oil outlet hole corresponds to the position of the planetary gear set arranged in the transmission shell.

[0017] On the basis of the above scheme, a reinforcing rib penetrating up and down is arranged on the outer wall of the transmission shell.

[0018] On the basis of the above scheme, the inner wall of the transmission shell is surrounded by a cylindrical shape at the position corresponding to the input drum assembly.

[0019] On the basis of the above scheme, a rotational speed detection hole and a second rotational speed detection hole are arranged on the wall of the transmission shell; the distance between the second rotational speed detection hole and the planetary gear set in the axial direction is greater than the distance between the rotational speed detection hole and the planetary gear set.

[0020] In addition, the application also relates to a method for improving the performance of a 68RFE transmission, which uses a new input drum assembly, the new input drum assembly comprising a clutch retainer, a lower transmission piston, a clutch plate, a clutch friction disc, a lower transmission retainer plate and a clutch pressure plate; the application also comprises a piston cap and a piston body, and a bolt for fixedly connecting the piston cap and the piston body; the lower transmission piston, the clutch plate, the clutch friction disc and the lower transmission retainer plate are arranged in the clutch retainer.

[0021] Or

[0022] After the input drum assembly in the 68RFE transmission is disassembled, the clutch piston, the wedge block and the snap spring are replaced by the piston cap and the piston body; then, the lower transmission piston, the clutch plate, the clutch friction disc and the lower transmission retainer plate are arranged in the clutch retainer, and are arranged between the piston cap and the piston body; finally, the bolt is used to fixedly connect the piston cap and the piston body.

[0023] On the basis of the above scheme, a new transmission shell is used, and a shell oil injection hole for inputting lubricating oil into the inside of the transmission shell and a shell oil outlet hole for outputting the input lubricating oil are arranged on the wall of the new transmission shell.

[0024] On the basis of the above scheme, the oil inlet hole of the shell corresponds to the position of the input drum assembly, and the oil outlet hole of the shell corresponds to the position of the planetary gear set arranged in the transmission shell.

[0025] On the basis of the above scheme, the inner wall of the transmission shell is cylindrical at the position corresponding to the input drum assembly.

[0026] On the basis of the above scheme, the wall of the transmission shell is provided with a rotation speed detection hole and a second rotation speed detection hole; the distance between the second rotation speed detection hole and the planetary gear set in the axial direction is greater than the distance between the rotation speed detection hole and the planetary gear set. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of a transmission in the present application (only a part of the transmission shell is shown);

[0028] Figure 2 is an exploded structural schematic diagram of an input drum assembly in the prior art;

[0029] Figure 3 is Figure 2 an assembly state diagram of the input drum assembly in

[0030] Figure 4 is Figure 3 a sectional view of the input drum assembly in the assembly state in

[0031] Figure 5 is Figure 2 a sectional view of a clutch piston, a wedge block and a snap spring in the input drum assembly in the present application in the assembly state;

[0032] Figure 6 is an exploded structural schematic diagram of a new input drum assembly in the present application;

[0033] Figure 7 is Figure 6 an assembly state diagram of the new input drum assembly in

[0034] Figure 8 is Figure 7 a sectional view of the input drum assembly in the assembly state in

[0035] Figure 9 is Figure 6 a sectional view of a piston body cap, a piston body and a bolt in the new input drum assembly in the present application in the assembly state;

[0036] Figure 10 is a structural schematic diagram of a clutch piston of an input drum assembly in the prior art;

[0037] Figure 11This is a structural schematic diagram of the piston cap, piston body, and clutch retainer of the new input drum assembly in this application;

[0038] Figure 12 yes Figure 10 Part A and Figure 11 Enlarged comparison diagram of part B (A is the clutch retainer in the prior art; B is the clutch retainer in this application).

[0039] Figure 13 yes Figure 11 A magnified structural diagram of section C;

[0040] Figure 14 This is a structural schematic diagram (stereoscopic view) of the new transmission housing in this application;

[0041] Figure 15 This is a structural schematic diagram (front view) of the new transmission housing in this application;

[0042] Figure 16 yes Figure 15 Schematic diagram of the sectional view along the central AA direction;

[0043] Figure 17 yes Figure 16 A magnified structural diagram of part A in the middle;

[0044] Figure 18 This is a structural schematic diagram of the new transmission housing in this application (showing the location of the speed detection hole). Detailed Implementation

[0045] Aspects of the present patent include an input drum assembly, a 68RFE transmission, and methods for improving the performance of a 68RFE transmission. Improving the performance of a 68RFE transmission includes several aspects, including primarily: (1) improving the cooling and lubrication efficiency of the input drum assembly in a 68RFE transmission through a new input drum assembly 200 (retainer oil hole 222, piston body oil hole 272) and / or a transmission housing 300 (housing oil injection hole 31 and housing oil outlet hole 32); (2) increasing the installation space of the clutch plate 14 and the clutch friction disc 15 through the new input drum assembly 200 (piston body cap 21, piston body 27, and bolt 20 replacing the clutch piston 11, wedge block 17, and clip spring 19), thereby increasing the thickness of the clutch plate 14 and the clutch friction disc 15 or increasing the number of clutch plate 14 and clutch friction disc 15, ultimately increasing the torque that the 68RFE transmission can withstand; (3) increasing the overall strength of the transmission housing by adding reinforcing ribs 33 when the transmission housing 300 is cast, avoiding the tail breakage of the original transmission housing; (4) increasing the diameter of the input drum assembly by machining the corresponding inner wall of the input drum assembly 200 after the transmission housing 300 is cast, thereby increasing the diameter of the clutch plate 14 and the clutch friction disc 15, ultimately increasing the torque that the 68RFE transmission can withstand; (5) providing a basis for increasing the axial space of the input drum assembly 200 by providing a rotational speed detection hole 34 and a second rotational speed detection hole 35 on the wall of the transmission housing 300.

[0046] Using the methods or components (input drum assembly and transmission housing) described herein, improvements or upgrades can be made to the existing 68RFE transmission. In this document, "68RFE" refers to the model 68RFE transmission used in Dodge pickup trucks.

[0047] As shown in Figure 2 and Figure 3 In the conventional input drum assembly 100, the clutch piston 11 and the wedge block 17 are connected together by the clip spring 19. This connection method leaves little space for the intermediate clutch plate 14, clutch friction disc 15, and lower transmission retaining plate 16, and the wedge block 17, which is a separate structure, requires sufficient thickness (thickness of about 9 mm); therefore, more clutch plates 14 and clutch friction discs 15 cannot be installed to increase the friction area, which also cannot increase the torque that the input drum assembly can withstand.

[0048] In addition to the above-mentioned existing input drum assembly, in other existing designs, the input drum assembly 100 is designed to have an oil hole on the clutch piston 11 (as shown in Figure 10The oil hole is drilled on the clutch piston 11, but the clutch retainer 12 is still between the clutch piston 11 and the clutch plate 14 and the clutch friction disc 15, so the oil hole drilled on the clutch piston 11 cannot well play the effect of heat conduction.

[0049] The application discloses an input drum assembly 200 for Dodge pickup truck 68RFE transmission to improve the overall performance and service life of the 68RFE transmission.

[0050] The improved input drum assembly of the application can directly replace the input drum assembly in the Dodge 68RFE transmission without any modification to the Dodge 68RFE transmission or the housing of the transmission.

[0051] Compared with the existing input drum assembly 100 shown in the figure, Figures 2-5 , Figure 1 , Figures 6-9 Many components in the existing input drum assembly 100 are retained in the improved input drum assembly 200 shown in the figure. For example, the lower transmission piston 13, the clutch plate 14, the clutch friction disc 15, the lower transmission retainer plate 16 and the clutch pressure plate 18.

[0052] As shown in the figure, Figure 1 , Figures 6-9 The improved input drum assembly 200 includes the clutch retainer 12, the lower transmission piston 13, the clutch plate 14, the clutch friction disc 15, the lower transmission retainer plate 16 and the clutch pressure plate 18, and further includes the piston cap 21 and the piston body 27, and the bolt 20 for fixedly connecting the piston cap 21 and the piston body 27. The lower transmission piston 13, the clutch plate 14, the clutch friction disc 15 and the lower transmission retainer plate 16 are arranged in the clutch retainer 12.

[0053] As a specific embodiment, the piston cap 21 has a cap body 21-1 abutting against the end face of the clutch retainer 12, the edge of the cap body 21-1 extends in the circumferential direction to form a lip 21-2 with a certain width and thickness, and a plurality of through holes 21-3 for inserting the bolt 20 are arranged on the lip 21-2;

[0054] As shown in the figure, Figure 13 The piston body 27 includes a cylindrical barrel 27-1, a plurality of hole grooves 27-2 adapted to the bolt 20 and the through hole 21-3 are arranged on the end face of the one end of the barrel 27-1 close to the piston cap 21, a retainer plate 27-3 is formed at the one end of the barrel 27-1 away from the piston cap 21, and a piston body groove 271 is arranged on the retainer plate 27-3.

[0055] The piston cap 21 and the piston body 27 fixed together are set outside the clutch retainer 12, at the same time, the positioning sheet 121 on the clutch retainer 12 passes through the piston body groove 271 on the piston body 27, and finally is clamped and connected with the groove 181 on the clutch pressure plate 18. The positioning sheet 121 plays a role of positioning the piston body 27.

[0056] In the improved input drum assembly 200 described above, the piston cap 21, the piston body 27 and the bolt 20 replace the clutch piston 11, the wedge block 17 and the circlip 19 in the existing input drum assembly 100. Because in the existing input drum assembly 100, the clutch piston 11 and the wedge block 17 are connected together by the fixed way of the circlip 19. First, the wedge block 17 is a separate split structure, which is fixed with the clutch piston 11 by the circlip 19, so the wedge block 17 must have a large strength, and a small strength will deform, such as bending, when in use. Therefore, the thickness of the wedge block 17 must be large (in the existing design, the thickness is about 9 mm); secondly, the circlip 19 is a necessary structural part, which also has a certain thickness (the thickness is about 1.8 mm). Because in the transmission, the space for placing the input drum assembly is fixed, the large thickness of the wedge block 17 and the thickness of the circlip 19 will occupy the space in the thickness direction. The direct consequence is to reduce the number of clutch plates 14 and clutch friction plates 15; or under the premise of not reducing the number of clutch plates 14 and clutch friction plates 15, the thickness of the clutch plates 14 and the clutch friction plates 15 is thinned, which will reduce the torque and service life that the input drum assembly can withstand.

[0057] In the improved input drum assembly 200, the piston body 27 with the piston body groove 271 is an independent structure, which is fixed with the piston cap 21 by the bolt 20, so the overall strength is much larger than that of the wedge block 17 of the existing input drum assembly 100, so the thickness of the retaining plate 27-3 of the piston body 27 can be reduced to 2 / 3 of the thickness of the wedge block 17 while maintaining the same strength as the existing input drum assembly 100. At the same time, in the improved structure of the application, the circlip 19 is no longer used, so in the improved design, the installation space of the clutch plates 14 and the clutch friction plates 15 is increased from 40 mm to 44.5 mm. As can be seen, in the improved input drum assembly 200 of the application, under the premise of improving the overall performance of the components, because the axial space is saved, more space is provided for subsequent increase in the thickness or number of clutch plates 14 and clutch friction plates 15, thereby improving the torque that the input drum assembly can withstand.

[0058] Based on the improved input drum assembly 200, in order to improve the overall heat exchange effect of the input drum assembly 200, a plurality of piston body oil holes 272 are formed on the wall of the cylinder body 27-1 of the piston body 27, and through the piston body oil holes 272, the internal components of the input drum assembly 200 can be lubricated and cooled by using lubricating oil.

[0059] The clutch retainer 12 in the traditional input drum assembly 100 restricts the internal clutch plate 14 and clutch friction disc 15, resulting in poor lubrication and heat exchange effect of the internal lubricating oil. In order to further improve the lubrication and cooling effect, as shown in Figure 11 , a new clutch retainer 22 is used, which has a plurality of retainer oil holes 222 formed on the wall of the traditional clutch retainer 12, and in the installed state of the improved input drum assembly 200, the retainer oil holes 222 correspond one-to-one with the piston body oil holes 272 (as shown by the dashed line in Figure 11 ), thereby effectively improving the lubrication and cooling effect.

[0060] As shown in Figure 10 , Figure 11 and Figure 12 , because the traditional input drum assembly 100 uses a clip spring 19 to fix the clutch piston 11 and the wedge block 17, and the clip spring 19 needs the positioning piece 121 of the clutch retainer 12 to be restricted, therefore, a recess needs to be formed on the outer wall of the positioning piece 121 near the side of the clutch retainer 12 (as shown in Figure 12 ), which will thin the positioning piece 121, and further damage the strength of the positioning piece 12. The improved input drum assembly 200 does not use the clip spring 19, so it does not need to form a recess on the positioning piece. As shown in Figure 12 , as shown in Figure 6 , Figure 11 , 13 , the wall thickness of the positioning piece 221 on the new clutch retainer 22 is uniform (except for the position of the clamping groove), which increases the strength of the positioning piece 221. This good technical effect is also brought by the piston cap 21 and the piston body 27 replacing the clutch piston 11 and the wedge block 17. The above-mentioned new clutch retainer 22 actually adds the retainer oil hole 222 to the existing clutch retainer 12, while changing the structure of the positioning piece.

[0061] The improved input drum assembly 200 described above can directly replace the input drum assembly in the existing transmission, so as to increase or thicken the clutch plate 14 and the clutch friction disc 15 in the transmission, thereby improving the torque that the transmission can withstand; at the same time, due to the one-to-one correspondence of the retainer oil holes 222 and the piston body oil holes 272 in the input drum assembly 200, the lubrication and cooling effect of the transmission can be effectively improved.

[0062] In order to improve the performance of the existing 68RFE transmission, the following two methods can be used: (a) using a new input drum assembly 200 in the 68RFE transmission; or (b) replacing the clutch piston 11, wedge 17 and circlip 19 in the input drum assembly of the existing 68RFE transmission with the piston cap 21 and piston body 27; then, setting the existing components such as the lower transmission piston 13, clutch plate 14, clutch friction disc 15 and lower transmission retaining plate 16 in the clutch retainer 12 between the piston cap 21 and piston body 27, and finally using the bolt 20 to fixedly connect the piston cap 21 and piston body 27, thereby forming a new input drum assembly 200. In the above method of improving the performance of the existing 68RFE transmission, only the input drum assembly of the existing 68RFE transmission needs to be replaced, or the clutch piston 11, wedge 17 and circlip 19 in the input drum assembly of the existing 68RFE transmission are replaced with the bolt 20, piston cap 21 and piston body 27. In addition, other structures and components of the existing 68RFE transmission do not need to be changed.

[0063] The above describes the specific structure of the improved input drum assembly 200 and the technical effects achieved. Based on the above technical solution, in order to further improve the lubrication and cooling effect of the transmission, the present application provides a new transmission housing 300 to replace the existing transmission housing. Specifically, as shown in Figure 13 The new transmission housing 300 maintains the same structure as the existing transmission housing, and only sets the housing oil inlet hole 31 for inputting lubricating oil into the transmission housing and the housing oil outlet hole 32 for outputting the input lubricating oil from the transmission housing on the transmission housing. The housing oil inlet hole 31 and the housing oil outlet hole 32 are provided for lubricating and heat exchanging the components in the transmission housing 300, and their settings are not arbitrary.

[0064] As a specific embodiment, as shown in Figure 1As shown, the housing oil inlet 31 corresponds to the position of the input drum assembly 200 (specifically, to the piston body 27), and the housing oil outlet 32 ​​corresponds to the position of the planetary gear set disposed inside the transmission housing. In use, the housing oil inlet 31 corresponding to the input drum assembly 200 first injects external lubricating oil into the transmission housing. The flowing lubricating oil then sequentially enters the interior of the input drum assembly 200 through the piston body oil hole 272 and the retainer oil hole 222. The lubricating oil then cools the clutch disc 14 and clutch friction disc 15 inside the input drum assembly 200. After cooling, the flowing lubricating oil flows out of the input drum assembly 200 and into the position of the planetary gear set to lubricate it. Finally, the flowing lubricating oil exits the transmission housing 300 through the housing oil outlet 32 ​​corresponding to the planetary gear set. The lubricating oil is first injected into the input drum assembly 200 because the temperature inside the input drum assembly 200 is high, requiring relatively cool lubricating oil to carry away the heat.

[0065] By replacing the existing input drum assembly in the transmission with the improved input drum assembly 200, and simultaneously replacing the existing transmission housing with the transmission housing 300, the lubrication and cooling performance of the transmission can be significantly improved. In other words, when upgrading or improving an existing transmission, only the input drum assembly can be replaced, or both the input drum assembly and the transmission housing can be replaced simultaneously.

[0066] In addition to the improvements mentioned above, the transmission housing 300 also includes, for example... Figures 14-17 As shown, this application also provides several other improvements to the transmission housing. The transmission housing is formed by casting. Figure 16 In the diagram, parts A and B represent the existing walls of the transmission housing, while part 33 indicates the newly added reinforcing rib 33 in this patent. During the casting process, in order to successfully demold, the inner wall of the transmission housing needs to be inclined at a certain angle. Figure 16 As shown in Part B), this tilt limits the diameter of the input drum assembly. Existing transmission housings have a minimum diameter of 210 mm and a maximum diameter of 227.7 mm at the location accommodating the input drum assembly, with the minimum diameter determining the maximum diameter of the input drum assembly. To address this technical problem, this application, after the transmission housing is cast, uses machining to cut the tilted inner wall of the transmission housing at the location accommodating the input drum assembly (…). Figure 16Part B is cut off to make its inner wall cylindrical (i.e., the inner wall of the transmission housing forms a cylinder at the corresponding location of the input drum assembly 200). This allows the transmission housing to form a cylindrical inner cavity with a diameter of 227.7 mm at the location accommodating the input drum assembly 200. This improvement provides room for upgrading the input drum assembly, the most obvious advantage being the ability to increase the diameter of the clutch disc 14 and the clutch friction plate 15. This further increases the torque that the transmission can withstand.

[0067] The aforementioned machining process on the inner wall of the transmission housing reduces its wall thickness. Therefore, during casting, a continuous reinforcing rib 33 is simultaneously cast onto the outer wall of the transmission housing. This reinforcing rib 33 not only compensates for this issue but also strengthens the overall integrity of the transmission housing, particularly providing excellent reinforcement at the location corresponding to the planetary gear set. This is because the existing 68RFE transmission housing at the location corresponding to the planetary gear set (… Figure 16 The wall thickness at the location indicated by the middle arrow is only 4mm, making it prone to breakage during use. Using reinforcing rib 33 provides excellent reinforcement and protection in this area. Figure 15 As shown, in addition to the reinforcing rib 33, an auxiliary reinforcing rib 36 is also provided on each side of the transmission housing on both sides of the reinforcing rib 33. The auxiliary reinforcing ribs 36 and the reinforcing rib 33 together reinforce the rear of the transmission housing (the rear refers to...). Figure 15 The upper part of the transmission housing needs to be reinforced, and the auxiliary reinforcing rib 36 does not need to be placed at the flared end of the transmission housing (i.e., Figure 15 It is connected at the lower part of the middle.

[0068] like Figure 17 As shown, a conventional transmission housing has a speed detection hole 34, which corresponds to the position of the clutch hub. Because the position of the speed detection hole 34 is fixed, it restricts the location of the speed test point, thus limiting the axial extension space of the internal input drum assembly 200, and consequently preventing the addition of more clutch plates 14 and clutch friction discs 15. Therefore, a second speed detection hole 35 is added. Specifically, the axial distance between the second speed detection hole 35 and the planetary gear set is greater than the distance between the speed detection hole 34 and the planetary gear set. This arrangement provides a basis for assembling the clutch hub away from the planetary gear set, thereby providing a basis for extending the axial space of the input drum assembly 200. The axial extension of the input drum assembly 200 means that the number of internally installed clutch plates 14 and clutch friction discs 15 can be increased, or their thickness increased.

[0069] The second rotation speed detection hole 35 is provided to upgrade and improve the input drum assembly 200. If the rotation speed detection hole 34 is not used and the second rotation speed detection hole 35 is directly used, the input drum assembly 200 with a longer axial length (a longer axial length means more pieces or a greater thickness of the installed clutch plate 14 and clutch friction disc 15) can be used inside. Figure 17 The height H shown in the middle is the height difference between the rotation speed detection hole 34 and the second rotation speed detection hole 35, so that a greater torque can be borne and heavier goods can be pulled.

[0070] For the transmission, the selection and processing of materials are very important. In addition to the improvement of the structure of the input drum assembly and the housing of the transmission, several changes in materials are made in the present application. For example, in the traditional input drum assembly, the clutch piston 11 and the clutch retainer 12 are both made of aluminum alloy. In order to increase the strength, alloy steel material can be used. For the traditional transmission housing, there is no T6 heat treatment when die casting, so the housing is brittle and has poor toughness. In the transmission housing 300, aluminum alloy A356-T6 can be used to improve the strength, toughness and impact resistance, and the overall wall thickness can be thickened to 1.5-2.5 times that of the traditional housing.

[0071] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments made in accordance with the technical essence of the present application, as long as it does not deviate from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. An input drum assembly for improving the performance of a 68RFE transmission, comprising a clutch retainer (12), a lower drive piston (13), a clutch disc (14), a clutch friction disc (15), a lower drive retainer plate (16), and a clutch pressure plate (18); characterized in that, It also includes a piston cap (21) and a piston body (27), as well as bolts (20) for fixing the piston cap (21) and the piston body (27); the lower drive piston (13), clutch disc (14), clutch friction disc (15) and lower drive retainer (16) are disposed in the clutch retainer (12); The piston cap (21) has a cap body (21-1) that fits against the end face of the clutch retainer (12); the edge of the cap body (21-1) extends circumferentially to form a lip (21-2) with a certain width and thickness; the lip (21-2) has several through holes (21-3) for inserting bolts (20). The piston body (27) includes a cylindrical cylinder (27-1). Several slots (27-2) adapted to bolts (20) and through holes (21-3) are provided on the end face of the cylinder (27-1) near the piston cap (21). A retaining plate (27-3) is formed at the end of the cylinder (27-1) away from the piston cap (21). A piston body groove (271) is provided on the retaining plate.

2. The input drum assembly for improving the performance of a 68RFE transmission according to claim 1, characterized in that, The piston cap (21) and piston body (27) fixed together are fitted on the outside of the clutch retainer (12). Meanwhile, the positioning piece (121) on the clutch retainer (12) passes through the piston body groove (271) on the piston body (27) and finally engages with the groove (181) on the clutch pressure plate (18).

3. The input drum assembly for improving the performance of the 68RFE transmission according to claim 2, characterized in that, The piston body (27) has several piston body oil holes (272) on the wall of the cylinder (27-1); the clutch retainer (12) has several retainer oil holes (222) on the wall, and the retainer oil holes (222) correspond one-to-one with the piston body oil holes (272). 4.68RFE transmission, including: The transmission housing, planetary gear set, and input drum assembly, wherein the input drum assembly is the input drum assembly for improving the performance of the 68RFE transmission as described in any one of claims 1-3.

5. The 68RFE transmission according to claim 4, characterized in that, The transmission housing has an oil inlet (31) for inputting lubricating oil into the transmission housing and an oil outlet (32) for outputting the input lubricating oil into the transmission housing. The oil inlet (31) corresponds to the position of the input drum assembly (200), and the oil outlet (32) corresponds to the position of the planetary gear set installed inside the transmission housing.

6. The 68RFE transmission according to claim 5, characterized in that, The inner wall of the transmission housing is cylindrical at the corresponding location of the input drum assembly.

7. A method for improving the performance of a 68RFE transmission, characterized in that, The 68RFE transmission uses a new input drum assembly (200), which includes a clutch retainer (12), a lower drive piston (13), a clutch disc (14), a clutch friction disc (15), a lower drive retainer plate (16), and a clutch pressure plate (18); characterized in that it also includes a piston cap (21) and a piston body (27), and bolts (20) for fixing the piston cap (21) and the piston body (27); the lower drive piston (13), clutch disc (14), clutch friction disc (15), and lower drive retainer plate (16) are disposed within the clutch retainer (12); The piston cap (21) has a cap body (21-1) that fits against the end face of the clutch retainer (12); the edge of the cap body (21-1) extends circumferentially to form a lip (21-2) with a certain width and thickness; the lip (21-2) has several through holes (21-3) for inserting bolts (20). The piston body (27) includes a cylindrical cylinder (27-1). Several slots (27-2) adapted to bolts (20) and through holes (21-3) are provided on the end face of the cylinder (27-1) near the piston cap (21). A retaining plate (27-3) is formed at the end of the cylinder (27-1) away from the piston cap (21). A piston body groove (271) is provided on the retaining plate.

8. The method for improving the performance of a 68RFE transmission according to claim 7, characterized in that, Replace the transmission housing (300) with a new transmission housing (300) which has a housing oil injection hole (31) for inputting lubricating oil into the transmission housing and a housing oil outlet hole (32) for outputting the input lubricating oil to the transmission.

9. A method for improving the performance of a 68RFE transmission, characterized in that, After disassembling the input drum assembly in the 68RFE transmission, replace the clutch piston (11), wedge (17), and snap ring (19) with piston cap (21) and piston body (27); then, place the lower drive piston (13), clutch disc (14), clutch friction disc (15), and lower drive retainer (16) in the clutch retainer (12), and then insert them between piston cap (21) and piston body (27). Finally, use bolts (20) to fix piston cap (21) and piston body (27) together. The piston cap (21) has a cap body (21-1) that fits against the end face of the clutch retainer (12); the edge of the cap body (21-1) extends circumferentially to form a lip (21-2) with a certain width and thickness; the lip (21-2) has several through holes (21-3) for inserting bolts (20). The piston body (27) includes a cylindrical cylinder (27-1). Several slots (27-2) adapted to bolts (20) and through holes (21-3) are provided on the end face of the cylinder (27-1) near the piston cap (21). A retaining plate (27-3) is formed at the end of the cylinder (27-1) away from the piston cap (21). A piston body groove (271) is provided on the retaining plate.

10. The method for improving the performance of a 68RFE transmission according to claim 9, characterized in that, Replace the transmission housing (300) with a new transmission housing (300) which has a housing oil injection hole (31) for inputting lubricating oil into the transmission housing and a housing oil outlet hole (32) for outputting the input lubricating oil to the transmission.

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