An eight forward and three reverse planetary transmission

Abstract

This invention provides an eight-forward, three-reverse planetary transmission; including a hydraulic torque converter, a rotary clutch, a brake, and a planetary gear set; this invention achieves eight forward gears and three reverse gears through four planetary gear sets, four brakes, and three clutches, making the transmission structure more compact, the transmission and shifting process smooth, the transmission ratio range wider, easier to automatically control, and convenient for operation under different working conditions.

Description

Technical Field

[0001] This invention relates to an eight-front, three-reverse planetary transmission. Background Technology

[0002] A vehicle's transmission typically includes multiple planetary gear sets, multiple clutches, and brakes. These units are selectively combined through hydraulic control to form a power transmission path, enabling multiple forward gears. Since multi-gear transmissions are more conducive to the vehicle's fuel economy, the development of transmissions tends towards multi-gear configurations.

[0003] For example, an eight-speed transmission disclosed in CN104033549B achieves eight forward gears and one reverse gear through four planetary gear sets, four clutches, and one brake. However, its speed ratio range is not very small, which is not conducive to use under various working conditions. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides an eight-front-three-reverse planetary transmission.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides an eight-front-three-reverse planetary transmission; comprising a hydraulic torque converter, a rotary clutch, a brake, and a planetary gear set;

[0007] The rotary clutch includes a first clutch, a second clutch, and a third clutch, and the drive hubs of the first clutch, the second clutch, and the third clutch are connected to the input component.

[0008] The brake includes a first brake, a second brake, a third brake, and a fourth brake;

[0009] The planetary gear set includes a first planetary gear set, a second planetary gear set, a third planetary gear set, and a fourth planetary gear set. The first planetary gear set includes a first gear ring, a first planet carrier, and a first sun gear. The second planetary gear set includes a second gear ring, a second planet carrier, and a second sun gear set. The third planetary gear set includes a third gear ring, a third planet carrier, and a third sun gear set. The fourth planetary gear set includes a fourth gear ring, a fourth planet carrier, and a fourth sun gear set.

[0010] The first clutch selectively connects the third sun gear, the fourth sun gear, and the output component;

[0011] The second clutch selectively engages the second sun gear, the third planet carrier, the fourth ring gear, and the output component;

[0012] The third clutch enables selective connection between the second planetary carrier, the third ring gear, and the output component;

[0013] The output component remains continuously connected to the first sun gear;

[0014] The first brake selectively connects the first gear ring to the fixed member;

[0015] The second brake selectively connects the second gear ring and the first planetary carrier to the fixed member;

[0016] The third brake selectively connects the third gear ring and the second planetary carrier to the fixed component;

[0017] The fourth brake selectively connects the fourth gear ring, the third planetary carrier, the second sun gear, and the fixed component.

[0018] The fixing component is the transmission housing.

[0019] The input component is the turbine shaft of the hydraulic torque converter.

[0020] The transmission establishes at least eight forward gear ratios and three reverse gear ratios;

[0021] In first gear, the first clutch and the fourth brake are engaged, the output component rotates synchronously with the fourth row of sun gears, and the fourth gear ring brakes.

[0022] In second gear, the first clutch and the third brake are engaged, the output component rotates synchronously with the third sun gear and the fourth sun gear, the third planet carrier rotates synchronously with the fourth ring gear, and the third ring gear is braked.

[0023] In the third gear, the first and second clutches are engaged, and the output component rotates synchronously with the fourth ring gear and the fourth sun gear.

[0024] Fourth gear, the second clutch and the first brake are engaged, the output component rotates synchronously with the first sun gear, the first planetary carrier rotates synchronously with the second ring gear, the second planetary carrier rotates synchronously with the third ring gear, the output component rotates synchronously with the second sun gear, the third planetary carrier and the fourth ring gear, the third sun gear and the fourth sun gear rotate synchronously, and the first ring gear is braked;

[0025] Fifth gear, the second clutch and the second brake are engaged, the second planetary carrier and the third ring gear rotate synchronously, the output component, the second sun gear, the third planetary carrier and the fourth ring gear rotate synchronously, the third sun gear and the fourth sun gear rotate synchronously, and the second ring gear is braked;

[0026] Sixth gear, the second clutch and the third brake are engaged, the output component rotates synchronously with the third planetary carrier and the fourth ring gear, the third sun gear rotates synchronously with the fourth sun gear, and the third ring gear is braked;

[0027] In the seventh gear, the third clutch and the first brake are engaged, the output component rotates synchronously with the first sun gear, the first planetary carrier rotates synchronously with the second ring gear, the output component rotates synchronously with the second planetary carrier and the third ring gear, the second sun gear, the third planetary carrier and the fourth ring gear rotate synchronously, the third sun gear and the fourth sun gear rotate synchronously, and the first ring gear is braked.

[0028] Eighth gear, the third clutch and the second brake are engaged, the output component rotates synchronously with the second planetary carrier and the third ring gear, the second sun gear, the third planetary carrier and the fourth ring gear rotate synchronously, the third sun gear and the fourth sun gear rotate synchronously, and the second ring gear is braked;

[0029] In reverse gear, the first and fourth brakes engage, the output component rotates synchronously with the first sun gear, the first planet carrier and the second ring gear rotate synchronously, the second planet carrier and the third ring gear rotate synchronously, the second sun gear, the third planet carrier and the fourth ring gear rotate synchronously, the third sun gear and the fourth sun gear rotate synchronously, and the first and fourth ring gears brake.

[0030] In reverse second gear, the third clutch and the fourth brake engage, the output component rotates synchronously with the third ring gear, the third planetary carrier rotates synchronously with the fourth ring gear, the third sun gear rotates synchronously with the fourth sun gear, and the fourth ring gear brakes.

[0031] In reverse third gear, the first and third brakes engage, the output component rotates synchronously with the first sun gear, the first planetary carrier rotates synchronously with the second ring gear, the second planetary carrier rotates synchronously with the third ring gear, the second sun gear, the third planetary carrier, and the fourth ring gear rotate synchronously, the third sun gear rotates synchronously with the fourth sun gear, and the first ring gear brakes.

[0032] The beneficial effects of this invention are as follows: by using 4 planetary gear sets, 4 brakes, and 3 clutches, 8 forward gears and 3 reverse gears are achieved, making the transmission structure more compact, the transmission and shifting process smooth, the transmission ratio range wider, easy to automatically control, and convenient to operate under different working conditions. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the transmission principle of the gearbox of the present invention;

[0034] Figure 2 This is the transmission shift logic table of the present invention;

[0035] Figure 3 This is a schematic diagram of the first gear transmission principle of the transmission of the present invention;

[0036] Figure 4 This is a schematic diagram of the second gear transmission principle of the transmission of the present invention;

[0037] Figure 5 This is a schematic diagram of the three-speed transmission principle of the transmission of the present invention;

[0038] Figure 6 This is a schematic diagram of the four-speed transmission principle of the transmission of the present invention;

[0039] Figure 7 This is a schematic diagram of the five-speed transmission principle of the transmission of the present invention;

[0040] Figure 8 This is a schematic diagram of the six-speed transmission principle of the transmission of the present invention;

[0041] Figure 9 This is a schematic diagram of the seven-speed transmission principle of the transmission of the present invention;

[0042] Figure 10 This is a schematic diagram of the eight-speed transmission principle of the transmission of the present invention;

[0043] Figure 11 This is a schematic diagram of the reverse gear transmission principle of the transmission of the present invention;

[0044] Figure 12 This is a schematic diagram of the reverse second gear transmission principle of the present invention;

[0045] Figure 13 This is a schematic diagram of the reverse third gear transmission principle of the present invention;

[0046] In the diagram: 1-Hydraulic torque converter, 2-Output shaft, C1-First clutch, C2-Second clutch, C3-Third clutch, C4-First brake, C5-Second brake, C6-Third brake, C7-Fourth brake, P1-First planetary gear set, 11-First ring gear, 12-First planetary carrier, 13-First sun gear, P2-Second planetary gear set, 21-Second ring gear, 22-Second planetary carrier, 23-Second sun gear, P3-Third planetary gear set, 31-Third ring gear, 32-Third planetary carrier, 33-Third sun gear, P4-Fourth planetary gear set, 41-Fourth ring gear, 42-Fourth planetary carrier, 43-Fourth sun gear. Detailed Implementation

[0047] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0048] like Figure 1 The diagram shows an eight-front-three-reverse planetary transmission; including a hydraulic torque converter 1, a rotary clutch, a brake, and a planetary gear set;

[0049] The rotary clutch includes a first clutch C1, a second clutch C2, and a third clutch C3, and the drive hubs of the first clutch C1, the second clutch C2, and the third clutch C3 are connected to the input component.

[0050] The brake includes a first brake C4, a second brake C5, a third brake C6, and a fourth brake C7;

[0051] The planetary gear set includes a first planetary gear set P1, a second planetary gear set P2, a third planetary gear set P3, and a fourth planetary gear set P4. The first planetary gear set P1 includes a first gear ring 11, a first planet carrier 12, and a first sun gear 13. The second planetary gear set P2 includes a second gear ring 21, a second planet carrier 22, and a second sun gear 23. The third planetary gear set P3 includes a third gear ring 31, a third planet carrier 32, and a third sun gear 33. The fourth planetary gear set P4 includes a fourth gear ring 41, a fourth planet carrier 42, and a fourth sun gear 43.

[0052] The first clutch C1 selectively connects the third sun gear 33 and the fourth sun gear 43 to the output component;

[0053] The second clutch C2 selectively connects the second sun gear 23, the third planet carrier 32, the fourth ring gear 41 to the output component;

[0054] The third clutch C3 selectively connects the second planetary carrier 22, the third ring gear 31, and the output component;

[0055] The output component remains connected to the first sun gear 13;

[0056] The first brake C4 selectively connects the first gear ring 11 to the fixed member;

[0057] The second brake C5 selectively connects the second gear ring 21 and the first planetary carrier 12 to the fixed member;

[0058] The third brake C6 selectively connects the third gear ring 31 and the second planetary carrier 22 to the fixed component;

[0059] The fourth brake C7 selectively connects the fourth gear ring 41, the third planetary carrier 32, the second sun gear 23 to the fixed component.

[0060] The fixing component is the transmission housing.

[0061] The input component is the turbine shaft of the hydraulic torque converter.

[0062] The transmission establishes at least eight forward gear ratios and three reverse gear ratios;

[0063] like Figure 3 As shown, in first gear, the first clutch C1 and the fourth brake C7 are engaged, the output component rotates synchronously with the fourth sun gear 43, and the fourth gear ring 41 is braked.

[0064] like Figure 4As shown, in second gear, the first clutch C1 and the third brake C6 are engaged, the output component rotates synchronously with the third sun gear 33 and the fourth sun gear 43, the third planet carrier 32 rotates synchronously with the fourth ring gear 41, and the third ring gear 31 is braked.

[0065] like Figure 5 As shown, in the third gear, the first clutch C1 and the second clutch C2 are engaged, and the output component rotates synchronously with the fourth gear ring 41 and the fourth sun gear 43.

[0066] like Figure 6 As shown, in fourth gear, the second clutch C2 and the first brake C4 are engaged, the output component rotates synchronously with the first sun gear 13, the first planet carrier 12 rotates synchronously with the second ring gear 21, the second planet carrier 22 rotates synchronously with the third ring gear 31, the output component rotates synchronously with the second sun gear 23, the third planet carrier 32, and the fourth ring gear 41, the third sun gear 33 and the fourth sun gear 43 rotate synchronously, and the first ring gear 11 is braked;

[0067] like Figure 7 As shown, in fifth gear, the second clutch C2 and the second brake C5 are engaged, the second planetary carrier 22 and the third ring gear 31 rotate synchronously, the output component, the second sun gear 23, the third planetary carrier 32 and the fourth ring gear 41 rotate synchronously, the third sun gear 33 and the fourth sun gear 43 rotate synchronously, and the second ring gear 21 is braked.

[0068] like Figure 8 As shown, in the sixth gear, the second clutch C2 and the third brake C6 are engaged, the output component rotates synchronously with the third planetary carrier 32 and the fourth ring gear 41, the third sun gear 33 rotates synchronously with the fourth sun gear 43, and the third ring gear 31 is braked.

[0069] like Figure 9 As shown, in seventh gear, the third clutch C3 and the first brake C4 are engaged, the output component rotates synchronously with the first sun gear 13, the first planet carrier 12 rotates synchronously with the second ring gear 21, the output component rotates synchronously with the second planet carrier 22 and the third ring gear 31, the second sun gear 23, the third planet carrier 32, the fourth ring gear 41 rotates synchronously, the third sun gear 33 and the fourth sun gear 43 rotate synchronously, and the first ring gear 11 is braked.

[0070] like Figure 10 As shown, in the eighth gear, the third clutch C3 and the second brake C5 are engaged, the output component rotates synchronously with the second planetary carrier 22 and the third ring gear 31, the second sun gear 23, the third planetary carrier 32, the fourth ring gear 41 rotates synchronously, the third sun gear 33 and the fourth sun gear 43 rotate synchronously, and the second ring gear 21 is braked.

[0071] like Figure 11As shown, in reverse gear, the first brake C4 and the fourth brake C7 engage, the output component rotates synchronously with the first sun gear 13, the first planet carrier 12 and the second ring gear 21 rotate synchronously, the second planet carrier 22 and the third ring gear 31 rotate synchronously, the second sun gear 23, the third planet carrier 32 and the fourth ring gear 41 rotate synchronously, the third sun gear 33 and the fourth sun gear 43 rotate synchronously, and the first ring gear 11 and the fourth ring gear 41 are braked.

[0072] like Figure 12 As shown, in the second reverse gear, the third clutch C3 and the fourth brake C7 are engaged, the output component rotates synchronously with the third ring gear 31, the third planetary carrier 32 rotates synchronously with the fourth ring gear 41, the third sun gear 33 rotates synchronously with the fourth sun gear 43, and the fourth ring gear 41 is braked.

[0073] like Figure 13 As shown, in reverse third gear, the first brake C4 and the third brake C6 are engaged, the output component rotates synchronously with the first sun gear 13, the first planet carrier 12 rotates synchronously with the second ring gear 21, the second planet carrier 22 rotates synchronously with the third ring gear 31, the second sun gear 23, the third planet carrier 32, and the fourth ring gear 41 rotate synchronously, the third sun gear 33 rotates synchronously with the fourth sun gear 43, and the first ring gear 11 is braked.

[0074] A fixed speed ratio can be achieved by engaging any two of the first, second, and third clutches and the first, second, third, and fourth brakes. The shifting logic is as follows: Figure 2 .

Claims

1. An eight-forward, three-reverse planetary transmission, characterized in that: This includes hydraulic torque converters, rotary clutches, brakes, and planetary gear sets; The rotary clutch includes a first clutch, a second clutch, and a third clutch, and the drive hubs of the first clutch, the second clutch, and the third clutch are connected to the input component. The brake includes a first brake, a second brake, a third brake, and a fourth brake; The planetary gear set includes a first planetary gear set, a second planetary gear set, a third planetary gear set, and a fourth planetary gear set. The first planetary gear set includes a first gear ring, a first planet carrier, and a first sun gear. The second planetary gear set includes a second gear ring, a second planet carrier, and a second sun gear set. The third planetary gear set includes a third gear ring, a third planet carrier, and a third sun gear set. The fourth planetary gear set includes a fourth gear ring, a fourth planet carrier, and a fourth sun gear set. The first clutch selectively connects the third sun gear, the fourth sun gear, and the output component; The second clutch selectively engages the second sun gear, the third planet carrier, the fourth ring gear, and the output component; The third clutch enables selective connection between the second planetary carrier, the third ring gear, and the output component; The output component remains continuously connected to the first sun gear; The first brake selectively connects the first gear ring to the fixed member; The second brake selectively connects the second gear ring and the first planetary carrier to the fixed member; The third brake selectively connects the third gear ring and the second planetary carrier to the fixed component; The fourth brake selectively connects the fourth gear ring, the third planetary carrier, the second sun gear, and the fixed component; The fixed component is the transmission housing, and the input component is the turbine shaft of the hydraulic torque converter.

2. The eight-forward, three-reverse planetary transmission as described in claim 1, characterized in that: The transmission establishes at least eight forward gear ratios and three reverse gear ratios; In first gear, the first clutch and the fourth brake are engaged, the output component rotates synchronously with the fourth row of sun gears, and the fourth gear ring brakes. In second gear, the first clutch and the third brake are engaged, the output component rotates synchronously with the third sun gear and the fourth sun gear, the third planet carrier rotates synchronously with the fourth ring gear, and the third ring gear is braked. In the third gear, the first and second clutches are engaged, and the output component rotates synchronously with the fourth ring gear and the fourth sun gear. Fourth gear, the second clutch and the first brake are engaged, the output component rotates synchronously with the first sun gear, the first planetary carrier rotates synchronously with the second ring gear, the second planetary carrier rotates synchronously with the third ring gear, the output component rotates synchronously with the second sun gear, the third planetary carrier and the fourth ring gear, the third sun gear and the fourth sun gear rotate synchronously, and the first ring gear is braked; Fifth gear, the second clutch and the second brake are engaged, the second planetary carrier and the third ring gear rotate synchronously, the output component, the second sun gear, the third planetary carrier and the fourth ring gear rotate synchronously, the third sun gear and the fourth sun gear rotate synchronously, and the second ring gear is braked; Sixth gear, the second clutch and the third brake are engaged, the output component rotates synchronously with the third planetary carrier and the fourth ring gear, the third sun gear rotates synchronously with the fourth sun gear, and the third ring gear is braked; Seventh gear, third clutch and first brake engaged, output component rotates synchronously with first sun gear, first planetary carrier rotates synchronously with second ring gear, output component rotates synchronously with second planetary carrier and third ring gear, second sun gear, third planetary carrier and fourth ring gear rotate synchronously, third sun gear and fourth sun gear rotate synchronously, first ring gear brakes; Eighth gear, the third clutch and the second brake are engaged, the output component rotates synchronously with the second planetary carrier and the third ring gear, the second sun gear, the third planetary carrier and the fourth ring gear rotate synchronously, the third sun gear and the fourth sun gear rotate synchronously, and the second ring gear is braked; In reverse gear, the first and fourth brakes engage, the output component rotates synchronously with the first sun gear, the first planet carrier and the second ring gear rotate synchronously, the second planet carrier and the third ring gear rotate synchronously, the second sun gear, the third planet carrier and the fourth ring gear rotate synchronously, the third sun gear and the fourth sun gear rotate synchronously, and the first ring gear and the fourth ring gear brake. In reverse second gear, the third clutch and the fourth brake engage, the output component rotates synchronously with the third ring gear, the third planetary carrier rotates synchronously with the fourth ring gear, the third sun gear rotates synchronously with the fourth sun gear, and the fourth ring gear brakes. In reverse third gear, the first and third brakes engage, the output component rotates synchronously with the first sun gear, the first planetary carrier rotates synchronously with the second ring gear, the second planetary carrier rotates synchronously with the third ring gear, the second sun gear, the third planetary carrier, and the fourth ring gear rotate synchronously, the third sun gear rotates synchronously with the fourth sun gear, and the first ring gear brakes.

Images