Electric drive system

Abstract

The utility model provides an electric drive system which comprises a drive motor, the output end of the drive motor is connected with the input end of a first transmission, the output end of the first transmission is connected with the input end of a second transmission, and the output end of the second transmission is connected with a single-side wheel. The first transmission comprises a first gear pair, a second gear pair and a third gear pair which are connected in sequence, and the second transmission adopts a planetary gear transmission pair; the output torque of the motor is improved, the speed ratio of the speed reducer is increased, the power requirement of a wide-body large-tonnage mine truck can be met, and meanwhile it can be guaranteed that the electric wheel has high transmission efficiency and the service life.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electric drive mining truck, specifically relates to an electric drive system. BACKGROUND

[0002] The wide-body large-tonnage mining truck electric wheel in prior art generally adopts the structure of wheel-side single motor plus single-stage planetary reducer. When the carrying capacity of the wide-body mining truck is improved, the power of the electric wheel also needs to be improved, and the commonly used methods include increasing the motor output torque or increasing the reducer speed ratio.

[0003] To increase the motor output torque, there are two commonly used methods: the first method is to increase the size of the motor, and the disadvantage is that the weight and size of the electric wheel also need to be greatly increased; the second method is to increase the working voltage of the motor, and the disadvantages are that the efficiency of the motor decreases, the energy consumption loss increases, the heat generation increases greatly, and the service life of the motor decreases.

[0004] When the reducer speed ratio is increased, the speed ratio range of the single-stage planetary reducer is 3-10, and the speed ratio improvement space is limited.

[0005] In the existing mining truck electric wheel technology, a common scheme is to increase a reduction box between the wheel-side single motor and the single-stage planetary reducer, as described in the invention patent "Double-motor three-stage three-intermediate shaft transmission wheel-side electric drive axle for mining truck" with the patent application number CN202211414770. This scheme increases the total reduction ratio, but does not increase the motor output torque.

[0006] Therefore, there is an urgent need to provide a new scheme to solve the defects and deficiencies in the prior art. INVENTION CONTENTS

[0007] In order to solve the defects and deficiencies in the prior art, the utility model provides an electric drive system.

[0008] The technical scheme provided by the utility model is as follows:

[0009] An electric drive system, the system includes drive motor, the output end of drive motor is connected with the input end of first transmission, the output end of first transmission is connected with the input end of second transmission, the output end of second transmission is connected with single side wheel, its characterized in that: first transmission includes first gear pair, second gear pair and third gear pair that are connected in turn, second transmission selects planetary gear transmission pair.

[0010] As a further preferred embodiment of the utility model, the drive motor includes a first motor, a second motor, a third motor and a fourth motor.

[0011] As a further preferred embodiment of the utility model, the first gear pair includes a first driving gear and a first driven gear in corresponding engagement, the first driving gear is fixedly connected with the output end of the driving motor, and the first driven gear is fixedly connected with the input end of the second gear pair.

[0012] As a further preferred embodiment of the utility model, the first driving gear is provided with four, the four first driving gears are located in the same plane and are uniformly distributed on the outer periphery of the first driven gear.

[0013] As a further preferred embodiment of the utility model, the second gear pair includes a second driving gear and a second driven gear in corresponding engagement, the second driving gear is coaxially connected with the first driven gear, and the second driven gear is fixedly connected with the input end of the third gear pair.

[0014] As a further preferred embodiment of the utility model, the second driven gear is provided with three, the three second driven gears are located in the same plane and are uniformly distributed on the outer periphery of the second driving gear.

[0015] As a further preferred embodiment of the utility model, the third gear pair includes a third driving gear and a third driven gear in corresponding engagement, the third driving gear is coaxially connected with the second driven gear, and the third driven gear is fixedly connected with the input end of the second transmission.

[0016] As a further preferred embodiment of the utility model, the third driving gear is provided with three, the three third driving gears are located in the same plane and are uniformly distributed on the outer periphery of the third driven gear.

[0017] As a further preferred embodiment of the utility model, the second transmission includes a sun gear, a planetary gear is arranged around the outer periphery of the sun gear and is in corresponding engagement with the sun gear, and a ring gear fixedly connected with the outside is arranged on the outer periphery of the planetary gear; the sun gear is coaxially connected with the third driven gear, one end of a planetary carrier is connected with the planetary gear, and the other end is connected with an inside wheel.

[0018] As a further preferred embodiment of the utility model, the electric drive system is symmetrically arranged at both ends of the drive axle.

[0019] Compared with the prior art, the utility model has the beneficial effects including:

[0020] 1) The electric drive system provided by the utility model not only improves the output torque of the motor, but also increases the speed ratio of the reducer, can meet the power demand of wide-body large-tonnage mine trucks, and can guarantee that the electric wheel has high transmission efficiency and service life. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Structure diagram of the electric drive system provided by the present application;

[0022] Figure 2 Arrangement structure diagram of the gears of the first gear pair in the present application;

[0023] Figure 3 Arrangement structure diagram of the gears of the second gear pair in the present application;

[0024] Figure 4 Arrangement structure diagram of the gears of the third gear pair in the present application.

[0025] In the figure: 1 - driving motor; 2 - first transmission; 21 - first driving gear; 22 - first driven gear; 23 - second driving gear; 24 - second driven gear; 25 - third driving gear; 26 - third driven gear; 3 - second transmission; 4 - single-sided wheel. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In the description of the present application, 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 the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] [First embodiment]

[0030] AsFigures 1-4 The utility model provides a kind of electric drive system provided by the first embodiment of the utility model, system includes drive motor 1, the output end of drive motor 1 is connected with the input end of first transmission 2, the output end of first transmission 2 is connected the input end of second transmission 3, the output end of second transmission 3 is connected single side wheel 4, drive motor 1 in the embodiment includes first motor EM1, second motor EM2, third motor EM3 and fourth motor EM4, and the electric drive system is arranged symmetrically at the both ends of drive axle, to make the output power of drive motor 1 be sequentially transmitted to single side wheel by first transmission 2 and second transmission, both improve the output torque of motor, also increase the speed ratio of speed reducer, can satisfy the power demand of wide body large tonnage mine truck, while it can guarantee that electric wheel has higher transmission efficiency and service life.

[0031] In the embodiment, first transmission 2 includes first gear pair, second gear pair and third gear pair connected in sequence, wherein:

[0032] As shown in Figure 2 First gear pair includes corresponding meshing first driving gear 21 and first driven gear 22, first driving gear 21 is fixedly connected with the output end of drive motor 1, first driven gear 22 is fixedly connected with the input end of second gear pair, first driving gear 21 is provided with four, to correspond with each drive motor 1, four first driving gears 21 are located in the same plane and are evenly distributed on the outer periphery of first driven gear 22, realize power confluence, ensure that structure arrangement is uniform and power transmission is stable at the same time.

[0033] As shown in Figure 3 Second gear pair includes corresponding meshing second driving gear 23 and second driven gear 24, second driving gear 23 is coaxially connected with first driven gear 22, second driven gear 24 is fixedly connected with the input end of third gear pair;Second driven gear 24 is provided with three, three second driven gears 24 are located in the same plane and are evenly distributed on the outer periphery of second driving gear 23, realize power shunt, ensure that structure arrangement is uniform and power transmission is stable at the same time.

[0034] As shown in Figure 4 Third gear pair includes corresponding meshing third driving gear 25 and third driven gear 26, third driving gear 25 is coaxially connected with second driven gear 24, third driven gear 26 is fixedly connected with the input end of second transmission 3;Third driving gear 25 is provided with three to correspond with each second driven gear 24, three third driving gears 25 are located in the same plane and are evenly distributed on the outer periphery of third driven gear 26, realize power confluence, ensure that structure arrangement is uniform and power transmission is stable at the same time.

[0035] The second transmission 3 in the embodiment selects a planetary gear transmission pair, and the specific structure is as follows: the second transmission 3 comprises a sun gear, a planetary gear is arranged around the outer periphery of the sun gear and is in meshing correspondence with the sun gear, and a ring gear fixedly connected with the outside is arranged on the outer periphery of the planetary gear; the sun gear is coaxially connected with the third driven gear 26, one end of the planetary carrier is connected with the planetary gear, and the other end is connected with the inside wheel 4; power is input via the sun gear, and then transmitted to the single-sided gear via the planetary carrier at the planetary gear end, so that the output power of the driving motor 1 is transmitted to the single-sided wheel via the first transmission 2 and the second transmission in sequence, the output torque of the motor is improved, the speed ratio of the speed reducer is increased, the power demand of the wide-body large-tonnage mine truck can be met, and meanwhile, the electric wheel can have higher transmission efficiency and service life.

[0036] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, the scope of the utility model is defined by the appended claims instead of the above description, and therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the involved claims.

Claims

1. An electric drive system, said system comprising a drive motor (1), the output of which is connected to the input of a first transmission (2), the output of which is connected to the input of a second transmission (3), the output of which is connected to a single-sided wheel (4), characterized in that: The first transmission (2) comprises a first gear pair, a second gear pair and a third gear pair connected in sequence, and the second transmission (3) is selected from a planetary gear transmission pair.

2. The electric drive system of claim 1, wherein: The driving motor (1) comprises a first motor (EM1), a second motor (EM2), a third motor (EM3) and a fourth motor (EM4).

3. The electric drive system of claim 2, wherein: The first gear pair comprises a first driving gear (21) and a first driven gear (22) in corresponding engagement, the first driving gear (21) is fixedly connected with the output end of the driving motor (1), and the first driven gear (22) is fixedly connected with the input end of the second gear pair.

4. The electric drive system of claim 3, wherein: The first driving gear (21) is provided with four, and the four first driving gears (21) are located in the same plane and uniformly distributed on the outer periphery of the first driven gear (22).

5. The electric drive system of claim 3, wherein: The second gear pair comprises a second driving gear (23) and a second driven gear (24) in corresponding engagement, the second driving gear (23) is coaxially connected with the first driven gear (22), and the second driven gear (24) is fixedly connected with the input end of the third gear pair.

6. An electric drive system according to claim 5, characterized in that: The second driven gear (24) is provided with three, and the three second driven gears (24) are located in the same plane and uniformly distributed on the outer periphery of the second driving gear (23).

7. The electric drive system of claim 5, wherein: The third gear pair comprises a third driving gear (25) and a third driven gear (26) in corresponding engagement, the third driving gear (25) is coaxially connected with the second driven gear (24), and the third driven gear (26) is fixedly connected with the input end of the second transmission (3).

8. The electric drive system of claim 7, wherein: The third driving gear (25) is provided with three, and the three third driving gears (25) are located in the same plane and uniformly distributed on the outer periphery of the third driven gear (26).

9. The electric drive system of claim 7, wherein: The second transmission (3) comprises a sun gear, a planetary gear is arranged around the outer periphery of the sun gear and in corresponding engagement with the sun gear, and a ring gear fixedly connected with the outside is arranged on the outer periphery of the planetary gear; the sun gear is coaxially connected with the third driven gear (26), one end of the planetary carrier is connected with the planetary gear, and the other end is connected with the inner side wheel (4).

10. An electric drive system according to any one of claims 1-9, characterized in that: The electric drive system is symmetrically arranged at both ends of the drive axle.

Images