A hybrid power system for engineering machinery

Abstract

This invention discloses a hybrid power system for engineering machinery, comprising a power unit, a power input shaft, a first transmission shaft, and an output shaft. The power unit is connected to the power input shaft, which is connected to a first clutch unit, a second clutch unit, and a third clutch unit via a planetary gear unit. The first, second, and third clutch units are all mounted on the first transmission shaft, which is equipped with a first gear set. The first gear set connects to a fourth, fifth, sixth, and seventh clutch unit, all of which are connected to the output shaft. This invention meets energy conservation and emission reduction requirements, provides more power, offers more gears, and enables automatic gear shifting during operation, effectively solving current practical problems and meeting development needs.

Description

Technical Field

[0001] This invention belongs to the field of transmission technology, and in particular to a hybrid power system for engineering machinery. Background Technology

[0002] Bulldozers are crucial technical equipment in infrastructure construction, playing an irreplaceable role in construction operations. However, due to the frequent changes in load, bulldozers are characterized by low energy efficiency, high fuel consumption, and poor emissions. With the increasing severity of energy shortages and environmental pollution, energy conservation and emission reduction for bulldozers have attracted widespread attention. Furthermore, bulldozers are typically tracked, and due to the specific nature of their operations, they generally have as many reverse gears as forward gears, or even more. As infrastructure construction scales up, bulldozer models are constantly being upgraded, with increasing output power and more gears, making manual shifting increasingly inadequate for practical needs. Additionally, common low-power bulldozers cannot shift gears during operation, preventing drivers from shifting gears for acceleration when ground conditions are good. Shifting requires significant deceleration or stopping, resulting in a poor driving experience and hindering operational efficiency. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art and provide a hybrid power system for engineering machinery that can meet the requirements of energy conservation and emission reduction, has more power, more gears, and can achieve automatic gear shifting during operation.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A hybrid power system for engineering machinery includes a power unit, a power input shaft, a first transmission shaft, and an output shaft;

[0006] The power unit is connected to the power input shaft, which is connected to the first clutch unit, the second clutch unit, and the third clutch unit via a planetary unit. The first clutch unit, the second clutch unit, and the third clutch unit are all mounted on the first drive shaft. A first gear set is mounted on the first drive shaft, and the first gear set is connected to the fourth clutch unit, the fifth clutch unit, the sixth clutch unit, and the seventh clutch unit. The fourth clutch unit, the fifth clutch unit, the sixth clutch unit, and the seventh clutch unit are all connected to the output shaft.

[0007] Furthermore, the power unit includes an engine and a motor, and the power input shaft includes an input shaft and a hollow shaft; one end of the input shaft is connected to the output end of the engine via a spline, and the other end of the input shaft is connected to the first gear via a spline; one end of the hollow shaft is connected to the output end of the motor via a spline, and the other end of the hollow shaft is connected to the planetary carrier via a spline.

[0008] Furthermore, the planetary unit includes a planet carrier and a planetary gear shaft. The planetary gear shaft is loosely fitted on the planet carrier. A second gear and a third gear are respectively connected to both ends of the planetary gear shaft via splines. The second gear and the third gear are both loosely fitted on the planet carrier. The second gear meshes with the first gear.

[0009] Furthermore, the first clutch unit includes a first clutch and a fourth gear. The bracket of the first clutch is connected to the first drive shaft via a spline. One end of the first clutch is connected to the fourth gear via a spline. The fourth gear is loosely fitted on the first drive shaft and meshes with the third gear.

[0010] Furthermore, the second clutch unit includes a second clutch and a second gear ring. The second clutch shares a bracket with the first clutch. One end of the second clutch is connected to the second gear ring via a spline. The second gear ring is an internal gear ring and meshes with a third gear.

[0011] Furthermore, the third clutch unit includes a third clutch and a first gear ring. One end of the third clutch is connected to the first drive shaft via a spline, and the other end of the third clutch is connected to the first gear ring via a spline. The first gear ring is an internal gear ring, and the first gear ring meshes with the second gear.

[0012] Furthermore, the first gear set includes a fifth gear, a sixth gear, and a ninth gear. The fifth gear meshes with the sixth gear and the ninth gear, respectively. The fifth gear is connected to the first transmission shaft via a spline. The sixth gear is connected to the second intermediate shaft via a spline. The ninth gear is connected to the first intermediate shaft via a spline.

[0013] Furthermore, the fourth clutch unit includes a fourth clutch and a seventh gear, and the fifth clutch unit includes a fifth clutch and an eighth gear. The fourth clutch and the fifth clutch share a common bracket, and the common bracket of the fourth clutch and the fifth clutch is connected to the second intermediate shaft via a spline. The seventh gear is connected to one end of the fourth clutch via a spline, and the eighth gear is connected to one end of the fifth clutch via a spline. Both the seventh gear and the eighth gear are loosely fitted on the second intermediate shaft.

[0014] Furthermore, the sixth clutch unit includes a sixth clutch and a tenth gear, and the seventh clutch unit includes a seventh clutch and an eleventh gear. The sixth clutch and the seventh clutch share a common bracket, which is connected to the first intermediate shaft via a spline. One end of the sixth clutch is connected to the tenth gear via a spline, and one end of the seventh clutch is connected to the eleventh gear via a spline. Both the tenth gear and the eleventh gear are loosely fitted on the first intermediate shaft.

[0015] Furthermore, the output shaft is equipped with a twelfth gear and a thirteenth gear via splines. The twelfth gear meshes with the seventh gear and the tenth gear, respectively, and the thirteenth gear meshes with the eighth gear and the eleventh gear, respectively.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention provides a hybrid power system for engineering machinery. It employs a hybrid power combination, where the engine or electric motor outputs power. The input shaft or hollow shaft transmits power to any one of the first, second, and third clutches. After gear shifting and speed adjustment, the power is transmitted to the first drive shaft. The first drive shaft then transmits power via a gear set to any one of the fourth, fifth, sixth, and seventh clutches for gear shifting and speed adjustment, before finally transmitting power to the output shaft for output. The participation of the electric motor results in more abundant power and smoother input. Hybrid power, as an effective energy-saving and emission-reduction technology, improves the fuel economy of bulldozers due to the high efficiency and agility of the electric drive system. Furthermore, the mechanical transmission method offers higher power transmission efficiency and is more energy-saving and environmentally friendly compared to the original hydraulic transmission method. This invention uses clutch shifting, allowing gear shifting during operation. It achieves a 12-gear forward and 12-gear reverse configuration, providing a large number of gears and automatic shifting, resulting in smoother speed changes, a wider torque and speed output range, and no power interruption during gear shifting, which is beneficial for maximizing work efficiency and improving the driving experience. The hybrid power system for engineering machinery of the present invention is a power transmission system that can meet the requirements of energy conservation and emission reduction, has more power, more gears, and can automatically shift gears during operation, and can effectively solve current practical problems and development needs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the transmission route of the present invention.

[0020] Wherein: T01-Engine, T02-Motor, Z01-Input Shaft, Z02-Hollow Shaft, Z03-First Transmission Shaft, Z04-First Intermediate Shaft, Z05-Second Intermediate Shaft, Z06-Output Shaft, Z07-Planetary Gear Shaft, 01-First Gear, 02-Second Gear, 03-Planet Carrier, 04-Third Gear, 05-Fourth Gear, 06-First Gear Ring, 07-Second Gear Ring, 08-Fifth Gear, 09-Sixth Gear, 10-Seventh Gear, 11-Eighth Gear, 12-Ninth Gear, 13-Tenth Gear, 14-Eleventh Gear, 15-Twelfth Gear, 16-Thirteenth Gear, A-First Clutch, B-Second Clutch, C-Third Clutch, D-Fourth Clutch, E-Fifth Clutch, F-Sixth Clutch, G-Seventh Clutch. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings:

[0028] See Figure 1 This invention provides a hybrid power system for engineering machinery, including an engine T01, a motor T02, an input shaft Z01, a hollow shaft Z02, a first transmission shaft Z03, a first intermediate shaft Z04, a second intermediate shaft Z05, an output shaft Z06, a planetary gear shaft Z07, a first gear 01, a second gear 02, a third gear 04, a fourth gear 05, a fifth gear 08, a sixth gear 09, a seventh gear 10, an eighth gear 11, a ninth gear 12, a tenth gear 13, an eleventh gear 14, a twelfth gear 15, a thirteenth gear 16, a planetary carrier 03, a first gear ring 06, a second gear ring 07, a first clutch A, a second clutch B, a third clutch C, a fourth clutch D, a fifth clutch E, a sixth clutch F, and a seventh clutch G.

[0029] The left end of the input shaft Z01 is splinedly connected to the output end of the engine T01, and the right end is splinedly connected to the first gear 01. The left end of the hollow shaft Z02 is splinedly connected to the output end of the motor T02, and the right end is splinedly connected to the planetary carrier 03. The planetary gear shaft Z07 is loosely fitted on the planetary carrier 03. The left end of the planetary gear shaft Z07 is splinedly connected to the second gear 02, and the right end is splinedly connected to the third gear 04. Both the second gear 02 and the third gear 04 are loosely fitted on the planetary carrier 03 using the planetary gear shaft Z07. The second gear 02 meshes with the first gear 01 and the first gear ring 06. The first gear ring 06 is an internal gear ring, and its right end is splinedly connected to one end of the third clutch C. The third gear 04 meshes with the fourth gear 05 and the second gear ring 07. The second gear ring 07 is an internal gear ring, and its right end is splinedly connected to one end of the second clutch B. The fourth gear 05 is loosely fitted on the first transmission shaft Z03 and is also splinedly connected to one end of the first clutch A. The first clutch A and the second clutch B share a bracket, which is splined to the first drive shaft Z03. The right end of the third clutch C is splined to the first drive shaft Z03.

[0030] The fifth gear 08 is splinedly connected to the first drive shaft Z03 and meshes with the sixth gear 09 and the ninth gear 12 respectively. The sixth gear 09 is splinedly connected to the second intermediate shaft Z05, and the ninth gear 12 is splinedly connected to the first intermediate shaft Z04. The fourth clutch D and the fifth clutch E share a bracket, which is splinedly connected to the second intermediate shaft Z05; the sixth clutch F and the seventh clutch G share a bracket, which is splinedly connected to the first intermediate shaft Z04. The seventh gear 10 is loosely fitted on the second intermediate shaft Z05 and splinedly connected to one end of the fourth clutch D, meshing with the twelfth gear 15; the eighth gear 11 is loosely fitted on the second intermediate shaft Z05 and splinedly connected to one end of the fifth clutch E, meshing with the thirteenth gear 16. The tenth gear 13 is loosely fitted on the first intermediate shaft Z04 and splinedly connected to one end of the sixth clutch F, meshing with the twelfth gear 15; the eleventh gear 14 is loosely fitted on the first intermediate shaft Z04 and splinedly connected to one end of the seventh clutch G, meshing with the thirteenth gear 16. The twelfth gear 15 and the thirteenth gear 16 are both mounted on the output shaft Z06 via splines, and the first intermediate shaft Z04 and the second intermediate shaft Z05 are both arranged parallel to the output shaft Z06.

[0031] The power transmission route of the hybrid power system for engineering machinery of the present invention is as follows:

[0032] Table 1 Power transmission route of hybrid power system for construction machinery

[0033]

[0034]

[0035] As shown in Table 1, the hybrid power system for engineering machinery of the present invention has 12 forward gears (the gear numbers in the table are independent of the actual gear order). Power is output from the engine T01 or motor T02. The input shaft Z01 or hollow shaft Z02 transmits power to any one of the first clutch A, second clutch B, and third clutch C. After gear shifting and speed adjustment, the power is transmitted to the first drive shaft Z03. The first drive shaft Z03 transmits power through a gear set to any one of the fourth clutch D, fifth clutch E, sixth clutch F, and seventh clutch G. After gear shifting and speed adjustment, the power is transmitted through gears to the output shaft Z06 for output. Simultaneously, the speed adjustment of motor T02 can be used to achieve the same number of reverse gears, meaning the present invention can achieve 12 forward and 12 reverse gears.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hybrid power system for engineering machinery, characterized in that, It includes a power unit, a power input shaft, a first transmission shaft (Z03), and an output shaft (Z06). The power unit is connected to the power input shaft, which is connected to the first clutch unit, the second clutch unit, and the third clutch unit via a planetary unit. The first clutch unit, the second clutch unit, and the third clutch unit are all mounted on the first drive shaft (Z03). A first gear set is mounted on the first drive shaft (Z03), and the first gear set is connected to the fourth clutch unit, the fifth clutch unit, the sixth clutch unit, and the seventh clutch unit. The fourth clutch unit, the fifth clutch unit, the sixth clutch unit, and the seventh clutch unit are all connected to the output shaft (Z06). The power unit includes an engine (T01) and an electric motor (T02), and the power input shaft includes an input shaft (Z01) and a hollow shaft (Z02). The planetary unit includes a planet carrier (03) and a planetary gear shaft (Z07). The planetary gear shaft (Z07) is loosely fitted on the planet carrier (03). The two ends of the planetary gear shaft (Z07) are respectively connected to a second gear (02) and a third gear (04) via splines. The second gear (02) and the third gear (04) are both loosely fitted on the planet carrier (03). The second gear (02) meshes with the first gear (01). The first clutch unit includes a first clutch (A) and a fourth gear (05). The bracket of the first clutch (A) is connected to the first drive shaft (Z03) via a spline. One end of the first clutch (A) is connected to the fourth gear (05) via a spline. The fourth gear (05) is loosely fitted on the first drive shaft (Z03). The fourth gear (05) meshes with the third gear (04). The second clutch unit includes a second clutch (B) and a second gear ring (07). The second clutch (B) shares a bracket with the first clutch (A). One end of the second clutch (B) is connected to the second gear ring (07) via a spline. The second gear ring (07) is an internal gear ring and meshes with the third gear (04). The third clutch unit includes a third clutch (C) and a first gear ring (06). One end of the third clutch (C) is connected to the first drive shaft (Z03) via a spline, and the other end of the third clutch (C) is connected to the first gear ring (06) via a spline. The first gear ring (06) is an internal gear ring, and the first gear ring (06) meshes with the second gear (02). The first gear set is used to achieve four-speed shifting.

2. The hybrid power system for engineering machinery according to claim 1, characterized in that, One end of the input shaft (Z01) is connected to the output end of the engine (T01) via a spline, and the other end of the input shaft (Z01) is connected to the first gear (01) via a spline. One end of the hollow shaft (Z02) is connected to the output end of the motor (T02) via a spline, and the other end of the hollow shaft (Z02) is connected to the planetary carrier (03) via a spline.

3. The hybrid power system for engineering machinery according to claim 1, characterized in that, The first gear set includes a fifth gear (08), a sixth gear (09) and a ninth gear (12). The fifth gear (08) meshes with the sixth gear (09) and the ninth gear (12) respectively. The fifth gear (08) is connected to the first transmission shaft (Z03) by a spline. The sixth gear (09) is connected to the second intermediate shaft (Z05) by a spline. The ninth gear (12) is connected to the first intermediate shaft (Z04) by a spline.

4. The hybrid power system for engineering machinery according to claim 1, characterized in that, The fourth clutch unit includes a fourth clutch (D) and a seventh gear (10), and the fifth clutch unit includes a fifth clutch (E) and an eighth gear (11). The fourth clutch (D) and the fifth clutch (E) share a bracket. The shared bracket of the fourth clutch (D) and the fifth clutch (E) is connected to the second intermediate shaft (Z05) by a spline. The seventh gear (10) is connected to one end of the fourth clutch (D) by a spline, and the eighth gear (11) is connected to one end of the fifth clutch (E) by a spline. The seventh gear (10) and the eighth gear (11) are both loosely fitted on the second intermediate shaft (Z05).

5. A hybrid power system for engineering machinery according to claim 1, characterized in that, The sixth clutch unit includes a sixth clutch (F) and a tenth gear (13), and the seventh clutch unit includes a seventh clutch (G) and an eleventh gear (14). The sixth clutch (F) and the seventh clutch (G) share a bracket. The shared bracket of the sixth clutch (F) and the seventh clutch (G) is connected to the first intermediate shaft (Z04) via a spline. One end of the sixth clutch (F) is connected to the tenth gear (13) via a spline, and one end of the seventh clutch (G) is connected to the eleventh gear (14) via a spline. The tenth gear (13) and the eleventh gear (14) are both loosely fitted on the first intermediate shaft (Z04).

6. A hybrid power system for engineering machinery according to claim 1, characterized in that, The output shaft (Z06) is equipped with a twelfth gear (15) and a thirteenth gear (16) via splines. The twelfth gear (15) meshes with the seventh gear (10) and the tenth gear (13) respectively, and the thirteenth gear (16) meshes with the eighth gear (11) and the eleventh gear (14) respectively.

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