Speed control system

Abstract

The utility model provides a speed control system which comprises a first motor, a second motor, a first intermediate shaft, a second intermediate shaft, an output shaft, a differential mechanism, a first gear shifting device and a second gear shifting device, a transition mode is arranged among all working modes, when one motor carries out working mode switching, the other motor can continuously provide output power, and when the other motor carries out working mode switching, the other motor can continuously provide output power. Power is effectively not interrupted in the gear shifting process, and using requirements of special vehicles such as mine trucks under special working conditions such as uphill are perfectly met; according to gear shifting requirements, two motors, three sets of intermediate gear pairs and two gear shifting devices are arranged, a three-gear working mode is provided through speed ratio combination of the high-speed motor, the different gear pairs and the gear shifting devices so as to meet different use requirements, and the overall cost is low; a power machine, a transmission, a main speed reducer and a differential mechanism are integrated, a power chain of a traditional automobile is replaced, links such as redundant clutches, transmission shafts and universal joints are omitted, and the transmission efficiency is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of pure electric multi-motor multi-gear speed change system, in particular to a speed change system. Background Art

[0002] The transmission system in the prior art cannot adapt well to the power requirements of large-tonnage electric vehicles such as pure electric mining trucks, which is mainly reflected in: 1) There is power interruption during the gear shifting process, which cannot be applied to the use requirements of special vehicles such as mining trucks in special working conditions such as uphill; 2) In order to achieve the gear shifting needs, the transmission is often equipped with multiple sets of clutches, gear pairs, drive shafts, universal joints and other transmission parts, which occupy a large space, have low transmission efficiency and high manufacturing costs.

[0003] Therefore, there is an urgent need to provide a speed change system to solve the defects and shortcomings in the above-mentioned prior art. Utility Model Content

[0004] In order to solve the defects and shortcomings in the prior art, the utility model provides a speed change system.

[0005] The technical solution provided by the utility model is as follows:

[0006] A speed change system, characterized in that the system comprises:

[0007] a first motor, wherein an output shaft of the first motor is connected to a first intermediate shaft via a first input gear pair;

[0008] a second motor, the output shaft of the second motor being connected to the second intermediate shaft via a second input gear pair;

[0009] The first intermediate shaft and the second intermediate shaft are coaxially arranged and can be selectively engaged;

[0010] an output shaft, the output shaft being connected to the first intermediate shaft or the second intermediate shaft via an intermediate gear pair;

[0011] A differential, wherein the input end of the differential is connected to the output shaft through an output gear pair, and the output end of the differential is connected to the wheels through a left half shaft and a right half shaft respectively;

[0012] a first shifting device, the first shifting device being arranged on the first intermediate shaft to selectively engage the first intermediate shaft with the gear of the intermediate gear pair on one side, or with the second intermediate shaft on the other side, or being in a neutral position;

[0013] A second shifting device is arranged on the output shaft to selectively engage with the gears of the intermediate gear pairs on both sides or be located in a neutral position.

[0014] As a further preferred embodiment of the present utility model, both the first motor and the second motor are high-speed motors.

[0015] As a further preferred embodiment of the present invention,

[0016] The first input gear pair comprises a first input driving gear and a first input driven gear that are meshed with each other, the first input driving gear is fixedly arranged on the first motor output shaft, and the first input driven gear is fixedly arranged on the first intermediate shaft;

[0017] The second input gear pair includes a second input driving gear and a second input driven gear that are meshed with each other. The second input driving gear is fixedly disposed on the second motor output shaft, and the second input driven gear is fixedly disposed on the second intermediate shaft.

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

[0019] The intermediate gear pair includes a first gear pair, a second gear pair and a third gear pair arranged in sequence from the first motor to the second motor; wherein,

[0020] The first gear pair comprises a first driving gear loosely sleeved on the first intermediate shaft and a first driven gear fixed on the output shaft, and the first driving gear is meshed with the first driven gear correspondingly;

[0021] The second gear pair comprises a second driving gear fixed on the second intermediate shaft and a second driven gear loosely sleeved on the output shaft, and the second driving gear is meshed with the second driven gear correspondingly;

[0022] The third gear pair includes a second input driven gear fixed on the second intermediate shaft and a third driven gear loosely sleeved on the output shaft, and the second input driven gear is meshed with the third driven gear accordingly.

[0023] As a further preferred embodiment of the present utility model, both the first shifting device and the second shifting device are clutches.

[0024] As a further preferred embodiment of the present invention,

[0025] The first shifting device is fixed on the first intermediate shaft and is located between the first driving gear and the second intermediate shaft, so as to selectively engage the first intermediate shaft with the first driving gear on one side, or engage with the second intermediate shaft on the other side, or be located in a neutral position;

[0026] The second shifting device is fixed on the output shaft and located between the second driven gear and the third driven gear to selectively engage the output shaft with the second driven gear on one side, or with the third driven gear on the other side, or be located in a neutral position.

[0027] As a further preferred embodiment of the present invention, the output gear pair comprises an output driving gear fixed on the output shaft and an output driven gear fixed on the differential, and the output driving gear meshes with the output driven gear accordingly.

[0028] As a further preferred embodiment of the present invention, the output driving gear is fixed on the output shaft and is located between the first driven gear and the second driven gear.

[0029] As a further preferred embodiment of the present utility model, the differential includes a differential case fixedly connected to the output driven gear, the bevel gear shaft is located inside the differential case and drivingly connected to the differential case, the top and bottom of the bevel gear shaft are respectively sleeved with upper and lower bevel gears, the left and right half-shaft gears are meshingly connected between the upper and lower bevel gears, and the left half-shaft and the right half-shaft fixedly connected to the left and right half-shaft gears are respectively connected to the left and right wheels.

[0030] As a further preferred embodiment of the present invention, the system includes the following working modes:

[0031] In N mode, there is no power source, and the first shift device and the second shift device are both in the middle position;

[0032] In M0.5 mode, the second motor is used as the power source, the first shift device is in the middle position, and the second shift device is engaged with the gear of the second gear pair on one side;

[0033] In the M1.0 mode, the first motor and the second motor are used as a power source together, the first shift device is engaged with the gear of the first gear pair on one side, and the second shift device is engaged with the gear of the second gear pair on one side;

[0034] In M1.5 mode, the first motor is used as the power source, the first shift device is engaged with the gear of the first gear pair on one side, and the second shift device is in the middle position;

[0035] In the M2.0 mode, the first motor and the second motor are used together as the power source, the first shift device is engaged with the gear of the first gear pair on one side, and the second shift device is engaged with the gear of the third gear pair on the other side;

[0036] In M2.5 mode, the second motor is used as the power source, the first shift device is in the middle position, and the second shift device is engaged with the gear of the third gear pair on the other side;

[0037] In M3.0 mode, the first motor and the second motor serve as a power source together, the first shift device is engaged with the second intermediate shaft on the other side, and the second shift device is engaged with the gear of the third gear pair on the other side.

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

[0039] 1) The utility model provides a speed change system, in which a transition mode is arranged between each working mode. When one motor switches the working mode, the other motor can continuously provide output power, effectively realizing uninterrupted power during the gear shifting process, which is perfectly suitable for the use requirements of special vehicles such as mining trucks under special working conditions such as uphill.

[0040] 2) The utility model provides a speed change system, which is equipped with two motors, three sets of intermediate gear pairs and two shifting devices according to the gear shifting requirements. A three-speed working mode is provided through the combination of high-speed motors with different gear pairs and shifting devices to meet different usage requirements, and the overall cost is low.

[0041] 3) The utility model provides a transmission system that integrates a power machine, a transmission, a main reducer and a differential, which replaces the power chain of a traditional automobile, eliminates unnecessary links such as a clutch, a transmission shaft and a universal joint, and optimizes the transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic structural diagram of the first embodiment of the utility model. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] [First embodiment]

[0047] like Figure 1 The first embodiment of a speed change system provided by the utility model is shown, and the system comprises:

[0048] A first motor EM1, the output shaft of the first motor EM1 is connected to the first intermediate shaft 4 through a first input gear pair; in this embodiment, the first input gear pair includes a first input driving gear 2 and a first input driven gear 3 that are meshed with each other, the first input driving gear 2 is fixedly arranged on the first motor output shaft 1, and the first input driven gear 3 is fixedly arranged on the first intermediate shaft 4; the output power of the first motor EM1 is transmitted to the first intermediate shaft 4 through the first input gear pair;

[0049] The second motor EM2, the output shaft of the second motor EM2 is connected to the second intermediate shaft 7 through the second input gear pair; in this embodiment, the second input gear pair includes a second input driving gear 9 and a second input driven gear 8 that are meshed with each other, the second input driving gear 9 is fixedly arranged on the second motor output shaft 10, and the second input driven gear 8 is fixedly arranged on the second intermediate shaft 7; the output power of the second motor EM2 is transmitted to the second intermediate shaft 7 through the second input gear pair;

[0050] In this embodiment, both the first motor EM1 and the second motor EM2 are high-speed motors, which have the advantages of small size and high power. The speed change system provided in this embodiment can be driven by one motor or by two motors at the same time. When driven alone, it can continuously provide output power, so that when the other motor switches the working mode, the power is effectively not interrupted during the gear shifting process.

[0051] like Figure 1 As shown, in this embodiment, the first intermediate shaft 4 and the second intermediate shaft 7 are coaxially arranged and can be selectively engaged, so that the power of the first intermediate shaft 4 can be directly transmitted to the second intermediate shaft 7, or transmitted to the intermediate gear pair;

[0052] The output shaft 12 is connected to the first intermediate shaft 4 or the second intermediate shaft 7 through an intermediate gear pair; in this embodiment,

[0053] The intermediate gear pair includes a first gear pair, a second gear pair and a third gear pair arranged in sequence from the first motor to the second motor; wherein,

[0054] The first gear pair includes a first driving gear 5 loosely sleeved on the first intermediate shaft 4 and a first driven gear 13 fixed on the output shaft 12, and the first driving gear 5 is meshed with the first driven gear 13;

[0055] The second gear pair includes a second driving gear 6 fixed on the second intermediate shaft 7 and a second driven gear 17 loosely sleeved on the output shaft 12, and the second driving gear 6 is meshed with the second driven gear 17;

[0056] The third gear pair includes a second input driven gear 8 fixed on the second intermediate shaft 7 and a third driven gear 18 loosely sleeved on the output shaft 12, and the second input driven gear 8 is meshed with the third driven gear 18;

[0057] It is worth noting that the second input driven gear 8 in this embodiment serves as both the driven gear in the second input gear pair and the driving gear in the third gear pair, and the second input driving gear 9 and the second input driven gear 8, as well as the second input driven gear 8 and the third driven gear 18 are both constantly meshed gear pairs;

[0058] like Figure 1 As shown, the transmission system further includes a first shifting device A and a second shifting device B, and both the first shifting device A and the second shifting device B use clutches; the specific arrangement positions thereof are:

[0059] The first shifting device A is fixed on the first intermediate shaft 4 and is located between the first driving gear 5 and the second intermediate shaft 7 to selectively engage the first intermediate shaft 4 with the first driving gear 5 on one side, or with the second intermediate shaft 7 on the other side, or to be in a neutral position; Figure 1 As shown, when the first shift device A is in the left position, the first intermediate shaft 4 is engaged with the first driving gear 5; when the first shift device A is in the right position, the first intermediate shaft 4 is engaged with the second intermediate shaft 7; when the first shift device A is in the middle position, the first intermediate shaft 4 is idle and does not output power;

[0060] The second shift device B is fixed on the output shaft 12 and is located between the second driven gear 17 and the third driven gear 18 to selectively engage the output shaft 12 with the second driven gear 17 on one side, or with the third driven gear 18 on the other side, or in a neutral position; Figure 1As shown, when the second shift device B is in the left position, the second intermediate shaft 7 is engaged with the second driven gear 17; when the second shift device B is in the right position, the second intermediate shaft 7 is engaged with the third driven gear 18; when the second shift device B is in the middle position, the second intermediate shaft 7 has no power input on both sides of the second shift device B;

[0061] like Figure 1 As shown, the transmission system further includes a differential 14, the input end of the differential 14 is connected to the output shaft 12 through an output gear pair, and the output end of the differential 14 is connected to the wheels through the left half shaft 11 and the right half shaft 19 respectively;

[0062] Specifically, the differential 14 in this embodiment includes a differential case fixedly connected to the output driven gear 15, the bevel gear shaft is located inside the differential case and is drivingly connected to the differential case, the top and bottom of the bevel gear shaft are respectively sleeved with upper and lower bevel gears, the upper and lower bevel gears are meshed and connected with left and right half-shaft gears, and the left half-shaft 11 and the right half-shaft 19 fixedly connected to the left and right half-shaft gears are respectively connected to the left and right wheels;

[0063] The output gear pair in this embodiment includes an output driving gear 16 fixed on the output shaft 12 and an output driven gear 15 fixed on the differential 14. The output driving gear 16 is meshed with the output driven gear 15 accordingly. The power of the output shaft is transmitted to the differential through the output gear pair and then to the left and right wheels. Preferably, the output driving gear 16 in this embodiment is fixed on the output shaft 12 and is located between the first driven gear 13 and the second driven gear 17.

[0064] As shown in Table 1 below, the speed change system provided in this embodiment can implement the following working modes:

[0065] In the N mode, there is no power source, and the first shift device A and the second shift device B are both in the middle position;

[0066] In M0.5 mode, the second motor EM2 is used as the power source, the first shift device A is in the middle position, and the second shift device B is engaged with the gear of the second gear pair on one side; at this time, the second motor EM2 outputs power alone and outputs it to the left and right wheels through the second gear pair (at this time, the first motor EM1 shifts gears, and the second motor EM2 continues to output power);

[0067] In M1.0 mode, the first motor EM1 and the second motor EM2 serve as a power source together, the first shift device A is engaged with the gear of the first gear pair on one side, and the second shift device B is engaged with the gear of the second gear pair on one side; at this time, the output power of the first motor EM1 is output to the output shaft via the first gear pair, and the output power of the second motor EM2 is output to the output shaft via the second gear pair, and the power of both sides is combined on the output shaft and output to the left and right wheels through the differential;

[0068] In M1.5 mode, the first motor EM1 is used as the power source, the first shift device A is engaged with the gear of the first gear pair on one side, and the second shift device B is in the middle position; at this time, the first motor EM1 outputs power alone to the left and right wheels via the first gear pair (at this time, the second motor EM2 shifts gears, and the first motor EM1 continues to output power);

[0069] In M2.0 mode, the first motor EM1 and the second motor EM2 serve as a power source together, the first shift device A is engaged with the gear of the first gear pair on one side, and the second shift device B is engaged with the gear of the third gear pair on the other side; at this time, the output power of the first motor EM1 is output to the output shaft via the first gear pair, and the output power of the second motor EM2 is output to the output shaft via the third gear pair. The power of both sides is combined on the output shaft and output to the left and right wheels through the differential;

[0070] In M2.5 mode, the second motor EM2 is used as the power source, the first shift device A is in the middle position, and the second shift device B is engaged with the gear of the third gear pair on the other side; at this time, the second motor EM2 outputs power alone and outputs it to the left and right wheels through the third gear pair (at this time, the first motor EM1 shifts gears, and the second motor EM2 continues to output power);

[0071] In M3.0 mode, the first motor EM1 and the second motor EM2 serve as a power source together, the first shift device A is engaged with the second intermediate shaft on the other side, and the second shift device B is engaged with the gear of the third gear pair on the other side; at this time, the output power of the first motor EM1 is output to the second intermediate shaft 7 via the first intermediate shaft 4, and the output power of the second motor EM2 is output to the second intermediate shaft 7 via the second input gear pair. After the power of both sides is combined on the second intermediate shaft 7, it is transmitted to the output shaft via the third gear pair, and then output to the left and right wheels through the output gear pair and the differential.

[0072] Table 1 The working conditions of each shifting device in each working mode of the speed change system of this embodiment

[0073]

[0074] Note: ● indicates the current working position of the corresponding shift device in the current working mode

[0075] Considering dual-motor drive as the norm, modes M1.0, M2.0 and M3.0 can be regarded as the three gears of the transmission system, and the remaining modes can be used as transitional gears to achieve a power-free shifting process. This allows the transmission system to switch between three different working modes, which can not only meet the needs of the transmission system's multi-gear operation, but also achieve a power-free shifting process.

[0076] 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: A first electric motor (EM1), wherein an output shaft of the first electric motor (EM1) is connected to a first intermediate shaft (4) via a first input gear pair; a second electric machine (EM2), wherein an output shaft of the second electric machine (EM2) is connected to a second intermediate shaft (7) via a second input gear pair; The first intermediate shaft (4) and the second intermediate shaft (7) are coaxially arranged and can be selectively engaged; An output shaft (12), the output shaft (12) being connected to the first intermediate shaft (4) or the second intermediate shaft (7) via an intermediate gear pair; A differential (14), wherein an input end of the differential (14) is connected to the output shaft (12) via an output gear pair, and an output end of the differential (14) is connected to wheels via a left half shaft (11) and a right half shaft (19); a first shifting device (A), the first shifting device (A) being arranged on the first intermediate shaft (4) to selectively engage the first intermediate shaft (4) with a gear of an intermediate gear pair on one side, or with a second intermediate shaft (7) on the other side, or being in a neutral position; A second shifting device (B), the second shifting device (B) is arranged on the output shaft (12) to selectively engage with the gears of the intermediate gear pairs on both sides or be located in a neutral position.

2. A speed change system according to claim 1, characterized in that: The first motor (EM1) and the second motor (EM2) are both high-speed motors.

3. A speed change system according to claim 1, characterized in that: The first input gear pair comprises a first input driving gear (2) and a first input driven gear (3) which are meshed with each other, the first input driving gear (2) being fixedly arranged on the first motor output shaft (1), and the first input driven gear (3) being fixedly arranged on the first intermediate shaft (4); The second input gear pair comprises a second input driving gear (9) and a second input driven gear (8) which are meshed with each other, the second input driving gear (9) being fixedly arranged on the second motor output shaft (10), and the second input driven gear (8) being fixedly arranged on the second intermediate shaft (7).

4. A speed change system according to claim 1, characterized in that: The intermediate gear pair includes a first gear pair, a second gear pair and a third gear pair arranged in sequence from the first motor to the second motor; wherein, The first gear pair comprises a first driving gear (5) loosely sleeved on the first intermediate shaft (4) and a first driven gear (13) fixed on the output shaft (12), the first driving gear (5) being meshed with the first driven gear (13) correspondingly; The second gear pair comprises a second driving gear (6) fixed on the second intermediate shaft (7) and a second driven gear (17) loosely sleeved on the output shaft (12), the second driving gear (6) being meshed with the second driven gear (17) correspondingly; The third gear pair comprises a second input driven gear (8) fixed on the second intermediate shaft (7) and a third driven gear (18) loosely sleeved on the output shaft (12); the second input driven gear (8) is meshed with the third driven gear (18) accordingly.

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

6. A speed change system according to claim 4, characterized in that: The first shift device (A) is fixed on the first intermediate shaft (4) and is located between the first driving gear (5) and the second intermediate shaft (7) to selectively engage the first intermediate shaft (4) with the first driving gear (5) on one side, or engage with the second intermediate shaft (7) on the other side, or be located in a neutral position; The second shift device (B) is fixed on the output shaft (12) and is located between the second driven gear (17) and the third driven gear (18) to selectively engage the output shaft (12) with the second driven gear (17) on one side, or with the third driven gear (18) on the other side, or to be located in a neutral position.

7. A speed change system according to claim 4, characterized in that: The output gear pair comprises an output driving gear (16) fixed on the output shaft (12) and an output driven gear (15) fixed on the differential (14), and the output driving gear (16) is meshed with the output driven gear (15) accordingly.

8. A speed change system according to claim 7, characterized in that: The output driving gear (16) is fixed on the output shaft (12) and is located between the first driven gear (13) and the second driven gear (17).

9. A speed change system according to claim 7, characterized in that: The differential (14) comprises a differential case fixedly connected to the output driven gear (15); a bevel gear shaft is located inside the differential case and drivingly connected to the differential case; upper and lower bevel gears are respectively sleeved on the top and bottom of the bevel gear shaft; left and right half-shaft gears are meshingly connected between the upper and lower bevel gears; and a left half-shaft (11) and a right half-shaft (19) fixedly connected to the left and right half-shaft gears are respectively connected to the left and right wheels.

10. A speed change system according to any one of claims 1 to 9, characterized in that: The system includes the following working modes: In N mode, there is no power source, and the first shift device (A) and the second shift device (B) are both in the middle position; In the M0.5 mode, the second electric motor (EM2) is used as the power source, the first shift device (A) is in the middle position, and the second shift device (B) is engaged with the gear of the second gear pair on one side; In the M1.0 mode, the first motor (EM1) and the second motor (EM2) are used together as a power source, the first shift device (A) is engaged with a gear of the first gear pair on one side, and the second shift device (B) is engaged with a gear of the second gear pair on one side; In M1.5 mode, the first motor (EM1) is used as the power source, the first shift device (A) is engaged with the gear of the first gear pair on one side, and the second shift device (B) is in the middle position; In M2.0 mode, the first motor (EM1) and the second motor (EM2) are used together as a power source, the first shift device (A) is engaged with the gear of the first gear pair on one side, and the second shift device (B) is engaged with the gear of the third gear pair on the other side; In M2.5 mode, the second electric motor (EM2) is used as the power source, the first shift device (A) is in the middle position, and the second shift device (B) is engaged with the gear of the third gear pair on the other side; In M3.0 mode, the first motor (EM1) and the second motor (EM2) serve as a power source together, the first shift device (A) is engaged with the second intermediate shaft on the other side, and the second shift device (B) is engaged with the gear of the third gear pair on the other side.

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