New energy permanent magnet heavy truck motor

Abstract

The utility model discloses a new energy permanent magnet heavy truck motor which comprises a motor main shell, end covers are fixed at the top end and the bottom end of the motor main shell, a stator assembly is fixed on the inner side wall of the motor main shell, a rotor main shaft is inserted in the middle of the motor main shell in a sleeved mode, a rotor assembly is fixed on the rotor main shaft, and the rotor assembly is matched with the stator assembly. The bottom end of the rotor main shaft extends out of an end cover at the bottom of the motor main shell, a bottom shell is fixed to the bottom face of the end cover at the bottom of the motor main shell, and a connecting shaft is movably connected into the bottom shell through a bearing. The contact area of water and liquid for heat exchange in the motor main shell is large, the heat exchange efficiency is high, the cooling effect is greatly improved, the adopted rotary encoder is located in the bottom shell, the rotary encoder is not prone to being collided by external objects to be damaged, and normal use of the rotary encoder is guaranteed.

Description

Technical field:

[0001] The utility model relates to the technical field of motor equipment, and more specifically to a new energy permanent magnet heavy truck motor. Background technology:

[0002] As my country's economy shifts from a high-speed growth stage to a high-quality development stage, and in response to environmental protection needs, more and more existing heavy-duty trucks are driven by new energy permanent magnet motors.

[0003] During the operation of the motor, a large amount of heat will be generated, which needs to be dissipated. Therefore, existing heavy-duty truck motors all need to adopt water cooling for heat dissipation. The heat dissipation structure of the existing motor is an S-shaped coiled flow groove formed on the outer wall of the main cylinder. This process uses water to flow along the S-shaped coiled flow groove, and the contact area is gradually contacted with the flow groove for heat exchange. That is, the heat exchange contact area of ​​the water flow in the instantaneous state is not high, which affects the heat exchange effect. At the same time, the existing motor generally has an encoder installed on the outside of the rear end shell to detect its operation status, but it is set on the outside and is easily damaged by being touched or hit by external objects, affecting its use. Utility model content:

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a new energy permanent magnet heavy-duty truck motor, which has a large contact area with the water for heat exchange in the main housing of the motor, high heat exchange efficiency, greatly improving the cooling effect, and the rotary encoder used is located in the bottom housing, which is not easily damaged by collision with external objects, thereby ensuring its normal use.

[0005] The solution of the utility model to solve the technical problem is:

[0006] A new energy permanent magnet heavy truck motor comprises a motor main housing, a rotor main shaft is inserted in the middle of the motor main housing, the bottom end of the rotor main shaft extends out of the end cover at the bottom of the motor main housing, a bottom housing is fixed to the bottom surface of the end cover at the bottom of the electronic main housing, a connecting shaft is movably connected in the bottom housing through a bearing, a connecting end is formed in the middle of the top surface of the connecting shaft, an external spline protrusion is formed on the outer wall surface of the connecting end, a spline hole is formed in the middle of the bottom end of the rotor main shaft, the connecting end is inserted into the spline hole, and the external spline protrusion matches the spline groove of the inner wall of the spline hole;

[0007] A rotary encoder is fixed on the top surface of the bottom plate of the bottom shell, and the middle part of the connecting shaft is fixed in the rotary encoder.

[0008] The rotary encoder is placed in the bottom housing so that it is not easily hit by external objects, etc., thus ensuring its normal operation.

[0009] Furthermore, the motor main housing comprises an inner cylinder and an outer cylinder, the inner cylinder is inserted into the outer cylinder, the inner cylinder and the outer cylinder are clamped between two end ring plates, the same end surface of the inner cylinder and the outer cylinder is welded and fixed on the same end ring plate, and an annular cooling chamber is formed between the inner cylinder, the outer cylinder and the two end ring plates;

[0010] A liquid inlet through hole and a liquid outlet through hole are formed on an outer side wall of one side of the outer cylinder, and the liquid inlet through hole and the liquid outlet through hole are communicated with the annular cooling cavity.

[0011] An axially extending positioning protrusion is formed on one side of the inner cylinder, an axially extending positioning groove is formed in the middle of the outer wall surface of the positioning protrusion, and an axially extending protrusion is formed on the inner wall of the corresponding outer cylinder. The protrusion is inserted into the corresponding positioning groove, and the side walls on both sides of the protrusion are tightly attached to the corresponding inner walls of the positioning groove, and the liquid inlet through hole and the liquid outlet through hole are located on both sides of the protrusion.

[0012] A plurality of arc-shaped protrusions are formed on the outer wall of the inner cylinder, and two ends of the arc-shaped protrusions are formed on the two side walls of the positioning protrusion strip;

[0013] An arc-shaped groove is formed between two upper and lower adjacent arc-shaped protrusions;

[0014] A plurality of outer arc-shaped protrusions are formed on the inner side wall of the outer cylinder body, the two ends of the outer arc-shaped protrusions are tightly attached to the two side walls of the positioning protrusion strip, the outer arc-shaped protrusions are inserted into the corresponding arc-shaped grooves, an outer arc-shaped groove is formed between two upper and lower adjacent outer arc-shaped protrusions, and the arc-shaped protrusions are inserted into the corresponding outer arc-shaped grooves; the outer arc-shaped protrusions and the arc-shaped protrusions are arranged at intervals.

[0015] The outstanding effects of the utility model are:

[0016] The contact area of ​​the water for heat exchange in the main housing of the motor is large, and the heat exchange efficiency is high, which greatly improves the cooling effect. Moreover, the rotary encoder it adopts is located in the bottom housing and is not easily damaged by collision with external objects, thus ensuring its normal use. Description of the drawings:

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a partial structural schematic diagram of the utility model;

[0019] Figure 3 It is a partial cross-sectional view of the main housing of the motor of the utility model;

[0020] Figure 4 It is a partial cross-sectional view between the inner cylinder and the outer cylinder. Specific implementation method:

[0021] For example, see Figures 1 to 4 As shown, a new energy permanent magnet heavy-duty truck motor includes a motor main housing 10, end covers 20 are fixed to the top and bottom ends of the motor main housing 10, a stator assembly is fixed to the inner wall of the motor main housing 10, a rotor main shaft 30 is inserted in the middle of the motor main housing 10, a rotor assembly is fixed to the rotor main shaft 30, and the rotor assembly cooperates with the stator assembly. The above structure is basically the same as the structure of the existing permanent magnet motor, which is the existing structure and will not be described in detail here.

[0022] Further, the bottom end of the rotor main shaft 30 extends out of the end cover 20 at the bottom of the motor main housing 10, and a bottom housing 40 is fixed to the bottom surface of the end cover 20 of the bottom plate of the electronic main housing 10. A connecting shaft 41 is movably connected to the bottom housing 40 through a bearing, and a connecting end 411 is formed in the middle of the top surface of the connecting shaft 41, and an external spline protrusion is formed on the outer side of the connecting end 411. A spline hole is formed in the middle of the bottom end of the rotor main shaft 30, and the connecting end 411 is inserted into the spline hole, and the external spline protrusion matches the spline groove of the inner side wall of the spline hole;

[0023] A rotary encoder 50 (simply shown in the figure) is fixed on the top surface of the bottom plate of the bottom housing 40, and the middle part of the connecting shaft 41 is fixed in the rotary encoder 50. The middle outer wall of the connecting shaft 41 is pressed against the inner wall of the middle through hole of the rotary encoder 50.

[0024] The rotary encoder 50 in this embodiment is a structure with a plug-in through hole formed in the middle. The rotary encoder 50 is a directly purchased product and will not be described in detail here. Then, the middle of the connecting shaft 41 is inserted into the middle through hole of the rotary encoder 50, and its outer wall is pressed against the inner wall of the middle through hole to achieve connection and fixation. With this structure, the rotary encoder 50 is in the bottom shell 40 and is not easily damaged by external objects touching or colliding, thereby ensuring the service life. Moreover, its connecting shaft 41 is spline-matched with the bottom end of the rotor main shaft 30 through the connecting end 411, so that its connection is stable and the operation is stable. The electrical connection signal line of the rotary encoder 50 extends out of the bottom shell 40 and can be electrically connected to the truck's on-board computer, so that its operating conditions are always transmitted to the on-board computer to achieve real-time monitoring.

[0025] Furthermore, the motor main housing 10 includes an inner cylinder 11 and an outer cylinder 12, the inner cylinder 11 is inserted into the outer cylinder 12, the inner cylinder 11 and the outer cylinder 12 are clamped between two end annular plates 13, the same end faces of the inner cylinder 11 and the outer cylinder 12 are welded and fixed on the same end annular plate 13, and an annular cooling chamber is formed between the inner cylinder 11, the outer cylinder 12 and the two end annular plates 13; the two end covers 20 are fixed to the outer end faces of the two end annular plates 13 by bolts.

[0026] A liquid inlet through hole 1 and a liquid outlet through hole 2 are formed on the outer side wall of one side of the outer cylinder 12, and the liquid inlet through hole 1 and the liquid outlet through hole 2 are communicated with the annular cooling cavity. At the same time, a protruding connection part 3 extending outward is formed on the corresponding outer side wall of the outer cylinder 12, and the outer ends of the liquid inlet through hole 1 and the liquid outlet through hole 2 extend out of the outer wall surface of the protruding connection part 3, and the outer wall surface of the protruding connection part 3 is connected to two connectors, and the two connectors are communicated with the liquid inlet through hole 1 and the liquid outlet through hole 2 respectively.

[0027] An axially extending positioning protrusion strip 111 is formed on one side of the inner cylinder body 11, and an axially extending positioning groove is formed in the middle of the outer wall surface of the positioning protrusion strip 111. An axially extending protrusion strip 121 is formed on the inner side wall of the corresponding outer cylinder body 12. The protrusion strip 121 is inserted into the corresponding positioning groove, and the side walls on both sides of the protrusion strip 121 are tightly attached to the corresponding inner side walls of the positioning groove, and the liquid inlet through hole 1 and the liquid outlet through hole 2 are located on both sides of the protrusion strip 121.

[0028] A plurality of arc-shaped protrusions 112 are formed on the outer wall of the inner cylinder 11, and two ends of the arc-shaped protrusions 112 are formed on the two side walls of the positioning protrusion strip 111;

[0029] An arc-shaped groove is formed between two upper and lower adjacent arc-shaped protrusions 112;

[0030] A plurality of outer arc-shaped protrusions 122 are formed on the inner side wall of the outer cylinder 12, and the two ends of the outer arc-shaped protrusions 122 are closely attached to the two side walls of the positioning protrusion strip 111, and the outer arc-shaped protrusions 122 are inserted into the corresponding arc-shaped grooves. An outer arc-shaped groove is formed between two upper and lower adjacent outer arc-shaped protrusions 122, and the arc-shaped protrusions 112 are inserted into the corresponding outer arc-shaped grooves;

[0031] The outer arc-shaped protrusion 122 and the arc-shaped protrusion 112 are arranged at intervals, and the arc-shaped protrusion 112 is close to the inner wall surface of the corresponding outer arc-shaped groove (the spacing is between 1mm and 2mm), and a flow gap is formed between them. A flow gap is formed between the outer arc-shaped protrusion 122 and the inner wall surface of the corresponding arc-shaped groove (the spacing is between 1mm and 2mm), and all the flow gaps are connected to form a total flow gap with a square waveform cross section, and the liquid inlet through hole 1 and the liquid outlet through hole 2 are connected to the total flow gap, and the liquid inlet through hole 1 and the liquid outlet through hole 2 are located on both sides by positioning the protrusion strips 111 and the protrusion strips 121;

[0032] This structure allows the coolant (such as water) to enter from the liquid inlet hole 1, enter along the corresponding side of the total circulation gap, flow along the total circulation gap, and finally flow out from the liquid outlet hole 2 (the connector connected to the liquid outlet hole 2 can be connected to the liquid inlet of an external heat exchange device, and the connector connected to the liquid inlet hole 1 can be connected to the liquid outlet of an external heat exchange device for heat exchange, and the heat exchange device has the same heat exchange structure as the existing new energy permanent magnet motor, which will not be described in detail here). Since the distance of the gap is very small, the coolant can basically flow across the entire cross-section of the total circulation gap, and its contact area is greatly increased, thereby improving its instantaneous heat exchange efficiency, thereby improving the overall heat exchange effect.

Claims

1. A new energy permanent magnet heavy truck motor, comprising a motor main housing (10), end covers (20) are fixed to the top and bottom ends of the motor main housing (10), a stator assembly is fixed to the inner side wall of the motor main housing (10), a rotor main shaft (30) is inserted in the middle of the motor main housing (10), a rotor assembly is fixed to the rotor main shaft (30), and the rotor assembly cooperates with the stator assembly, characterized in that: The bottom end of the rotor main shaft (30) extends out of the end cover (20) at the bottom of the motor main housing (10); a bottom housing (40) is fixed to the bottom surface of the end cover (20) at the bottom of the electronic main housing (10); a connecting shaft (41) is movably connected to the bottom housing (40) through a bearing; a connecting end (411) is formed in the middle of the top surface of the connecting shaft (41); an external spline protrusion is formed on the outer side of the connecting end (411); a spline hole is formed in the middle of the bottom end of the rotor main shaft (30); the connecting end (411) is inserted into the spline hole; the external spline protrusion matches the spline groove of the inner side wall of the spline hole; A rotary encoder (50) is fixed to the top surface of the bottom plate of the bottom shell (40), and the middle portion of the connecting shaft (41) is fixed in the rotary encoder (50).

2. A new energy permanent magnet heavy truck motor according to claim 1, characterized in that: The middle outer wall of the connecting shaft (41) is pressed against the inner wall of the middle through hole of the rotary encoder (50).

3. A new energy permanent magnet heavy truck motor according to claim 1, characterized in that: The motor main housing (10) comprises an inner cylinder (11) and an outer cylinder (12), the inner cylinder (11) is inserted into the outer cylinder (12), the inner cylinder (11) and the outer cylinder (12) are clamped between two end ring plates (13), the same end faces of the inner cylinder (11) and the outer cylinder (12) are welded and fixed on the same end ring plate (13), and an annular cooling chamber is formed between the inner cylinder (11), the outer cylinder (12) and the two end ring plates (13); A liquid inlet through hole (1) and a liquid outlet through hole (2) are formed on an outer side wall of one side of the outer cylinder (12), and the liquid inlet through hole (1) and the liquid outlet through hole (2) are in communication with the annular cooling cavity.

4. A new energy permanent magnet heavy truck motor according to claim 3, characterized in that: An axially extending positioning protrusion (111) is formed on one side of the inner cylinder (11), an axially extending positioning groove is formed in the middle of the outer wall surface of the positioning protrusion (111), and an axially extending protrusion (121) is formed on the inner side wall of the corresponding outer cylinder (12), the protrusion (121) is inserted into the corresponding positioning groove, the side walls on both sides of the protrusion (121) are tightly attached to the corresponding inner side walls of the positioning groove, and the liquid inlet through hole (1) and the liquid outlet through hole (2) are located on both sides of the protrusion (121).

5. A new energy permanent magnet heavy truck motor according to claim 4, characterized in that: A plurality of arc-shaped protrusions (112) are formed on the outer wall of the inner cylinder (11), and two ends of the arc-shaped protrusions (112) are formed on the two side walls of the positioning protrusion strip (111); An arc-shaped groove is formed between two upper and lower adjacent arc-shaped protrusions (112); A plurality of outer arc-shaped protrusions (122) are formed on the inner side wall of the outer cylinder (12), the two ends of the outer arc-shaped protrusions (122) are tightly attached to the two side walls of the positioning protrusion strip (111), the outer arc-shaped protrusions (122) are inserted into the corresponding arc-shaped grooves, an outer arc-shaped groove is formed between two upper and lower adjacent outer arc-shaped protrusions (122), and the arc-shaped protrusions (112) are inserted into the corresponding outer arc-shaped grooves; The outer arc-shaped protrusion (122) and the arc-shaped protrusion (112) are arranged at intervals, a flow gap is formed between the arc-shaped protrusion (112) and the inner wall surface of the corresponding outer arc-shaped groove, and a flow gap is formed between the outer arc-shaped protrusion (122) and the inner wall surface of the corresponding arc-shaped groove.

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