Speed control system

Abstract

The utility model provides a speed control system, which comprises a motor module, an input shaft, a transmission module and a control module, the input shaft and the output shaft are coaxially arranged and can be connected with the first intermediate shaft and the second intermediate shaft through a fourth gear pair or directly connected with the output shaft. The first intermediate shaft and the second intermediate shaft are connected with the output shaft through a first gear pair, a second gear pair or a third gear pair; the first gear shifting device is arranged on the output shaft and located between the fourth gear pair and the third gear pair so as to be selectively connected with a gear of the fourth gear pair or a gear of the third gear pair or located at the neutral position. The second gear shifting device is arranged on the output shaft and located between the second gear pair and the first gear pair so as to be selectively connected with a gear of the second gear pair or a gear of the first gear pair or located at the neutral position, the gear number is optimized, the motor power and the gear number of the gearbox are balanced, and practicability and cost are both considered.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy transmissions, in particular to a transmission system. Background Art

[0002] Although the pure electric drive system can improve the power of the system through multi-motor technology, which greatly reduces the number of gears required to be switched, heavy-duty commercial vehicles have diversified operating scenarios, and the requirements for the transmission efficiency of the electric drive system are getting higher and higher. Therefore, there is still a lot of room for optimization in the design of the electric drive transmission system.

[0003] For electric drive systems with more than 2-speed transmission systems, the design of the transmission system must meet the scene requirements while taking into account the driving experience, as well as the system's reliability, stability and structural space utilization.

[0004] There are two conventional speed shifting methods in the prior art, one is direct fork shifting and the other is hub fork shifting.

[0005] Therefore, how to design a transmission system that is easy to operate, has fewer components, high reliability, and occupies less space is a major challenge in the current development of electric drive transmission systems. Utility Model Content

[0006] In order to solve the defects and shortcomings in the prior art, the utility model provides a speed change system.

[0007] The technical solution provided by the utility model is as follows:

[0008] A speed change system, characterized in that the system comprises:

[0009] A motor module, wherein an output end of the motor module is connected to an input shaft;

[0010] The input shaft is coaxially arranged with the output shaft, and can be respectively connected to the first intermediate shaft and the second intermediate shaft through a fourth gear pair, or directly connected to the output shaft;

[0011] The first intermediate shaft and the second intermediate shaft are connected to the output shaft via the first gear pair, the second gear pair or the third gear pair;

[0012] a first shifting device disposed on the output shaft and located between the fourth gear pair and the third gear pair to selectively engage with a gear of the fourth gear pair or a gear of the third gear pair or to be in a neutral position;

[0013] A second shifting device is disposed on the output shaft and located between the second gear pair and the first gear pair to selectively engage with a gear of the second gear pair or a gear of the first gear pair or to be located in a neutral position.

[0014] As a further preferred embodiment of the present invention,

[0015] The motor module comprises a plurality of drive motors arranged in parallel, and the output shaft of each drive motor is connected to the input shaft via an input gear pair, and the plurality of drive motors are evenly distributed on the periphery of the input shaft; or

[0016] The motor module includes a single drive motor, and the output shaft of the drive motor is directly connected to the input shaft; or

[0017] The motor module includes a plurality of driving motors connected in series, wherein the output shaft of the driving motor is connected to the input end of the next motor, and the output shaft of the terminal driving motor is directly connected to the input shaft.

[0018] As a further preferred embodiment of the present invention,

[0019] The first gear pair comprises a first driving gear movably sleeved on the output shaft, a first driven gear fixedly arranged on the first intermediate shaft, and a first driven gear fixedly arranged on the second intermediate shaft, and the first driving gear is respectively meshed with the first driven gear and the first driven gear;

[0020] The second gear pair comprises a second driving gear movably sleeved on the output shaft, a second first driven gear fixedly arranged on the first intermediate shaft, and a second second driven gear fixedly arranged on the second intermediate shaft, and the second driving gear is respectively meshed with the second first driven gear and the second second driven gear;

[0021] The third gear pair comprises a third driving gear movably sleeved on the output shaft, a third-first driven gear fixedly arranged on the first intermediate shaft, and a third-second driven gear fixedly arranged on the second intermediate shaft, and the third driving gear is respectively meshed with the third-first driven gear and the third-second driven gear;

[0022] The fourth gear pair includes a fourth driving gear fixedly disposed on the input shaft, a fourth-first driven gear fixedly disposed on the first intermediate shaft, and a fourth-second driven gear fixedly disposed on the second intermediate shaft. The fourth driving gear is respectively meshed with the fourth-first driven gear and the fourth-second driven gear.

[0023] As a further preferred embodiment of the present invention, the fourth gear pair is a constant meshing gear pair.

[0024] As a further preferred embodiment of the present invention, in the transmission direction from the input shaft to the output shaft, the fourth gear pair, the third gear pair, the second gear pair and the first gear pair are arranged in sequence.

[0025] As a further preferred embodiment of the present utility model, the first intermediate shaft and the second intermediate shaft are symmetrically arranged on the outer circumference of the output shaft.

[0026] As a further preferred embodiment of the present utility model, the first shifting device is disposed on the output shaft and is located between the fourth driving gear and the third driving gear, so as to selectively engage with the fourth driving gear or the third driving gear or be located in a neutral position;

[0027] The second shifting device is disposed on the output shaft and is located between the second driving gear and the first driving gear so as to selectively engage with the second driving gear or the first driving gear or be located in a neutral position.

[0028] As a further preferred embodiment of the present invention, the first shifting device and the second shifting device are dog clutches, and

[0029] As a further preferred embodiment of the present invention, the system can achieve the following working gears:

[0030] Gear position N: neutral gear at this time; the first gear shift device and the second gear shift device are both in the middle position;

[0031] Gear position 1: This is the escape gear; the first gear shift device is engaged with the gear of the fourth gear pair on one side, and the second gear shift device is engaged with the gear of the first gear pair on the other side;

[0032] Gear position 2: This is the heavy load first gear: the first gear shifter is engaged with the gear of the fourth gear pair on one side, and the second gear shifter is engaged with the gear of the second gear pair on one side;

[0033] Gear position 3: This is the heavy-load second gear: the first shift device is engaged with the gear of the third gear pair on the other side, and the second shift device is in the middle position;

[0034] Gear position 4: This is the idle driving gear: the first gear shifting device is engaged with the gear of the fourth gear pair on one side, and the second gear shifting device is in the middle position.

[0035] As a further preferred embodiment of the present utility model, the speed change system can realize the following working modes according to the slope conditions under heavy load conditions:

[0036] When the slope is greater than the preset slope, the system enters working mode 1: the speed change system goes through gear 1 → gear 2 → gear 4;

[0037] When the slope is not greater than the preset slope, the system enters working mode 2: the speed change system goes through gear 1 → gear 3 → gear 4.

[0038] The beneficial effects achieved by the utility model compared with the prior art include:

[0039] 1) The utility model provides a transmission system with only 4 gears, optimizes the number of gears, strikes a balance between motor power and the number of gears of the transmission, and takes into account both practicality and cost.

[0040] 2) The utility model provides a speed change system that realizes gear shifting only under low-speed and flat road conditions, and does not shift gears during the rest of the operation process, thereby improving the gear shifting reliability.

[0041] 3) The utility model provides a transmission system with two gear operation modes, which is equivalent to integrating two speed ratio transmissions into one gearbox, thereby improving the adaptability to working conditions. Especially when the vehicle is transferred or the operating conditions change, it can perform intelligent identification and switch the gear mode to improve the operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of the gear structure of the first type of motor module of the speed change system of the utility model.

[0043] Figure 2 This is a schematic diagram of the gear structure of the second motor module of the speed change system of the utility model.

[0044] Figure 3 This is a schematic diagram of the gear structure of the third type of motor module of the speed change system of the utility model.

[0045] Figure 4 This is a schematic diagram of the gear structure of the fourth motor module of the speed change system of the utility model. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and 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, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] [First embodiment]

[0050] like Figure 1-4 The figure shows a speed change system provided by the first embodiment of the utility model, comprising:

[0051] Motor module, the output end of the motor module is connected to the input shaft S IN In this embodiment, the motor module can be configured in various forms, for example:

[0052] The motor module may include a plurality of drive motors arranged in parallel. The drive motors are high-speed motors, and the output shafts of each drive motor are parallel to each other and connected to the input shaft S through an input gear pair. IN , and multiple drive motors are evenly distributed on the input shaft S IN the periphery; Figure 1 The figure shows a schematic diagram of a gear structure including a first motor EM1 and a second motor EM2. Figure 2 It is a schematic diagram of the gear structure including the first motor EM1, the second motor EM2, the third motor EM3 and the fourth motor EM4;

[0053] like Figure 3 As shown, the motor module may also include a single drive motor EM, and the drive motor is a direct drive motor, whose output shaft is directly connected to the input shaft S IN On this basis,

[0054] like Figure 4 As shown, the motor module can also include multiple drive motors connected in series, and the drive motors are all direct drive motors. The output shaft of the drive motor is connected to the input end of the next motor, and the output shaft of the end drive motor is directly connected to the input shaft S IN .

[0055] like Figure 1-4 As shown,

[0056] Input shaft IN With output shaft S OUT The gears are coaxially arranged and can be connected to the first intermediate shaft S1 and the second intermediate shaft S2 respectively through the fourth gear pair GR4, or directly connected to the output shaft S OUT ;

[0057] In this embodiment, the fourth gear pair is a constant meshing gear pair, and the fourth gear pair includes a gear pair fixedly disposed on the input shaft S IN The fourth driving gear G41 on the first intermediate shaft S1, the fourth first driven gear G42 fixedly arranged on the first intermediate shaft S1 and the fourth second driven gear G43 fixedly arranged on the second intermediate shaft S2, the fourth driving gear G41 is respectively meshed with the fourth first driven gear G42 and the fourth second driven gear G43. The output power of the motor module can be transmitted to the first intermediate shaft S1 and the second intermediate shaft S2 via the fourth gear pair, or can be directly transmitted to the output shaft via the fourth driving gear G41;

[0058] The first intermediate shaft S1 and the second intermediate shaft S2 are connected to the output shaft S1 through the first gear pair, the second gear pair or the third gear pair. OUT In this embodiment, the first intermediate shaft S1 and the second intermediate shaft S2 are symmetrically arranged on the output shaft S OUT The outer periphery of the transmission system is conducive to achieving an overall balanced layout of the transmission system;

[0059] In this embodiment, if Figure 1-4 As shown,

[0060] The first gear pair includes a movable sleeve disposed on the output shaft S OUT The first driving gear G11 on the first intermediate shaft S1, the first driven gear G12 fixedly arranged on the first intermediate shaft S1, and the first second driven gear G13 fixedly arranged on the second intermediate shaft S2, the first driving gear G11 is meshed with the first driven gear G12 and the first second driven gear G13 respectively;

[0061] The second gear pair includes a movable sleeve disposed on the output shaft S OUT The second driving gear G21 on the first intermediate shaft S1, the second first driven gear G22 fixedly arranged on the first intermediate shaft S1 and the second second driven gear G23 fixedly arranged on the second intermediate shaft S2, the second driving gear G21 is meshed with the second first driven gear G22 and the second second driven gear G23 respectively;

[0062] The third gear pair includes a movable sleeve disposed on the output shaft S OUT The third driving gear G31 on the first intermediate shaft S1, the third driven gear G32 fixedly arranged on the first intermediate shaft S1, and the third driven gear G33 fixedly arranged on the second intermediate shaft S2, the third driving gear G31 is meshed with the third driven gear G32 and the third driven gear G33 respectively;

[0063] And in the transmission direction from the input shaft to the output shaft, the fourth gear pair GR4, the third gear pair GR3, the second gear pair GR2 and the first gear pair GR1 are arranged in sequence;

[0064] The power on the first intermediate shaft S1 and the second intermediate shaft S2 can be transmitted to the output shaft via the first gear pair, the second gear pair or the third gear pair;

[0065] like Figure 1-4 As shown, the transmission system provided in this embodiment also includes a first shift device A and a second shift device B, and the first shift device A and the second shift device B use dog clutches.

[0066] The first shifting device A is disposed on the output shaft and is located between the fourth driving gear G41 and the third driving gear G31 to selectively engage with the fourth driving gear G41 or the third driving gear G31 or to be located in a neutral position;

[0067] The second shift device B is disposed on the output shaft and located between the second driving gear G21 and the first driving gear G11 to selectively engage with the second driving gear G21 or the first driving gear G11 or to be located in a neutral position.

[0068] Through the corresponding actions of the first shift device A and the second shift device B, the present embodiment can achieve the following working gears: as shown in Table 1 below,

[0069] Table 1 Speed ​​​​transmission system working gear and shift device position table

[0070]

[0071] Note: "√" in the table indicates the working position of the corresponding shift device in the current working gear

[0072] Gear position N: neutral gear at this time; the first gear shift device A and the second gear shift device B are both in the middle position;

[0073] Gear position 1: This is the escape gear; the first gear shift device A is engaged with the gear of the fourth gear pair on one side, and the second gear shift device B is engaged with the gear of the first gear pair on the other side; at this time, the output power of the motor module is partly transmitted to the output shaft directly through the fourth driving gear G41, and partly transmitted to the first intermediate shaft S1 and the second intermediate shaft S2 through the fourth gear pair GR4, and then transmitted to the output shaft through the first gear pair GR1;

[0074] Gear position 2: This is the heavy load first gear: the first gear shift device A is engaged with the gear of the fourth gear pair on one side, and the second gear shift device B is engaged with the gear of the second gear pair on one side; at this time, the output power of the motor module is partly transmitted to the output shaft directly through the fourth driving gear G41, and partly transmitted to the first intermediate shaft S1 and the second intermediate shaft S2 through the fourth gear pair GR4, and then transmitted to the output shaft through the second gear pair GR2;

[0075] Gear position 3: This is the heavy-load second gear: the first gear shift device A is engaged with the gear of the third gear pair on the other side, and the second gear shift device B is in the middle position; at this time, the output power of the motor module is transmitted to the first intermediate shaft S1 and the second intermediate shaft S2 through the fourth gear pair GR4, and then transmitted to the output shaft through the third gear pair GR3;

[0076] Gear position 4: This is the idle driving gear: the first gear shift device A is engaged with the gear of the fourth gear pair on one side, and the second gear shift device B is in the middle position. At this time, the output power of the motor module is directly transmitted to the output shaft through the fourth driving gear G41.

[0077] The solution provided in this embodiment realizes four gears by adopting two gear shifting devices, but in actual work, only three of the gears are used, and the operation process is maintained without shifting.

[0078] Specifically, the speed change system can realize the following working modes according to the slope conditions under heavy load conditions:

[0079] When the slope is greater than the preset slope, the system enters working mode 1: the speed change system goes through gear 1 → gear 2 → gear 4; therefore, this working mode is mostly used in large slope conditions under heavy load conditions;

[0080] When the slope is not greater than the preset slope, the second working mode is entered: the speed change system goes through gear 1 → gear 3 → gear 4. Therefore, this working mode is mostly used in small slopes or flat road conditions under heavy load conditions.

[0081] In the prior art, two gearboxes are required for high speed ratio and low speed ratio, and they are switched and assembled according to different usage scenarios.

[0082] In the present embodiment, the ratio of the speed ratio of the second gear to the speed ratio of the third gear is 1.2-1.6, and the speed ratios of the two gears are relatively close, which broadens the application scenarios under heavy load conditions.

[0083] The present application integrates two speed ratios in the same gearbox. The ratio of the second gear ratio to the third gear ratio is 1.2-1.6, and the speed ratios of the two gears are relatively close. On the original basis, an additional working mode 2 is provided. When the slope is not greater than the preset slope, working mode 2 is entered: the speed change system goes through gear 1 → gear 3 → gear 4. Therefore, this working mode is mostly used in small slopes or flat road conditions under heavy load conditions.

[0084] Therefore, gear 2 and gear 3 are used as optional speed ratios. By identifying and judging the slope under heavy load and the comparison with the preset slope, the corresponding working mode is selected, thereby improving the adaptability of the system to working conditions. Since there are fewer gears and there is power interruption, it can be effectively applied to mining trucks where most operating conditions are relatively fixed.

[0085] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A speed change system, characterized in that: The system comprises: The motor module has an output end connected to the input shaft (S IN ); The input shaft (S IN ) and the output shaft (S OUT ) are coaxially arranged and can be connected to the first intermediate shaft (S1) and the second intermediate shaft (S2) respectively through the fourth gear pair (GR4), or directly connected to the output shaft (S OUT ); The first intermediate shaft (S1) and the second intermediate shaft (S2) are connected to the output shaft (S1) through the first gear pair, the second gear pair or the third gear pair. OUT ); a first shifting device (A), the first shifting device (A) being disposed on the output shaft and being located between the fourth gear pair and the third gear pair so as to selectively engage with a gear of the fourth gear pair or a gear of the third gear pair or be located in a neutral position; A second shifting device (B) is disposed on the output shaft and located between the second gear pair and the first gear pair to selectively engage with a gear of the second gear pair or a gear of the first gear pair or to be in a neutral position.

2. A speed change system according to claim 1, characterized in that: The motor module includes a plurality of drive motors arranged in parallel, and the output shaft of each drive motor is connected to the input shaft (S IN ), and multiple drive motors are evenly distributed on the input shaft (S IN )’s periphery; or The motor module includes a single drive motor, the output shaft of which is directly connected to the input shaft (S IN );or The motor module includes a plurality of drive motors connected in series, wherein the output shaft of the drive motor is connected to the input end of the next motor, and the output shaft of the terminal drive motor is directly connected to the input shaft (S IN ).

3. A speed change system according to claim 1, characterized in that: The first gear pair includes a movable sleeve arranged on the output shaft (S OUT ), a first driving gear (G11) fixedly arranged on the first intermediate shaft (S1), a first driven gear (G12) fixedly arranged on the first intermediate shaft (S1), and a first second driven gear (G13) fixedly arranged on the second intermediate shaft (S2), wherein the first driving gear (G11) is respectively meshed with the first first driven gear (G12) and the first second driven gear (G13); The second gear pair includes a movable sleeve arranged on the output shaft (S OUT ), a second driving gear (G21) fixedly arranged on the first intermediate shaft (S1), a second driven gear (G22) fixedly arranged on the first intermediate shaft (S1), and a second driven gear (G23) fixedly arranged on the second intermediate shaft (S2), wherein the second driving gear (G21) is respectively meshed with the second driven gear (G22) and the second driven gear (G23); The third gear pair includes a movable sleeve arranged on the output shaft (S OUT ), a third driving gear (G31) fixedly arranged on the first intermediate shaft (S1), a third driven gear (G32) fixedly arranged on the first intermediate shaft (S1), and a third driven gear (G33) fixedly arranged on the second intermediate shaft (S2), wherein the third driving gear (G31) is respectively meshed with the third driven gear (G32) and the third driven gear (G33); The fourth gear pair includes a gear fixedly disposed on the input shaft (S IN ), a fourth driving gear (G41) fixedly arranged on the first intermediate shaft (S1), a fourth driven gear (G42) fixedly arranged on the first intermediate shaft (S1), and a fourth second driven gear (G43) fixedly arranged on the second intermediate shaft (S2), wherein the fourth driving gear (G41) is respectively meshed with the fourth first driven gear (G42) and the fourth second driven gear (G43).

4. A speed change system according to claim 1, characterized in that: The fourth gear pair is a constant meshing gear pair.

5. A speed change system according to claim 1, characterized in that: In the transmission direction from the input shaft to the output shaft, the fourth gear pair (GR4), the third gear pair (GR3), the second gear pair (GR2) and the first gear pair (GR1) are arranged in sequence.

6. A speed change system according to claim 1, characterized in that: The first intermediate shaft (S1) and the second intermediate shaft (S2) are symmetrically arranged on the output shaft (S OUT )’s periphery.

7. A speed change system according to claim 1, characterized in that: The first shifting device (A) is arranged on the output shaft and is located between the fourth driving gear (G41) and the third driving gear (G31) so as to selectively engage with the fourth driving gear (G41) or the third driving gear (G31) or be located in a neutral position; The second shift device (B) is arranged on the output shaft and is located between the second driving gear (G21) and the first driving gear (G11) so as to selectively engage with the second driving gear (G21) or the first driving gear (G11) or be located in a neutral position.

8. A speed change system according to claim 1, characterized in that: The first shift device (A) and the second shift device (B) are dog clutches.

9. A speed change system according to any one of claims 1 to 8, characterized in that: The system can achieve the following working gears: Gear position N: It is neutral gear at this time; the first gear shift device (A) and the second gear shift device (B) are both in the middle position; Gear position 1: This is the escape gear; the first gear shift device (A) is engaged with the gear of the fourth gear pair on one side, and the second gear shift device (B) is engaged with the gear of the first gear pair on the other side; Gear position 2: This is the heavy load first gear: the first shift device (A) is engaged with the gear of the fourth gear pair on one side, and the second shift device (B) is engaged with the gear of the second gear pair on one side; Gear position 3: This is the heavy-duty second gear: the first shift device (A) is engaged with the gear of the third gear pair on the other side, and the second shift device (B) is in the middle position; Gear position 4: This is the idle driving gear: the first shift device (A) is engaged with the gear of the fourth gear pair on one side, and the second shift device (B) is in the middle position.

10. A speed change system according to claim 9, characterized in that: The speed change system can realize the following working modes according to the slope conditions under heavy load conditions: When the slope is greater than the preset slope, the system enters working mode 1: the speed change system goes through gear 1 → gear 2 → gear 4; When the slope is not greater than the preset slope, the system enters working mode 2: the speed change system goes through gear 1 → gear 3 → gear 4.

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