CN106374667B - Automobile micromotor shell - Google Patents

Abstract

The invention discloses an automobile micro-motor casing, which comprises a casing and an end cover. The casing has a casing bearing chamber, and the axial outer end of the casing bearing chamber is provided with an axial end for fixing a bearing. The first fixing part of the first fixing part is provided with a first through hole for the motor shaft to protrude, between the axial outer wall surface of the bottom of the cylinder and the first radial outer wall surface of the housing bearing chamber A first groove recessed axially inward is provided on the transition area between the bottom and the transition area between the axial inner wall surface of the cylinder bottom and the first radial inner wall surface of the casing bearing chamber. There is a first rib corresponding to the first groove and protruding toward the inside of the housing and used to extend the axial effective length of the bearing chamber of the housing. The invention can not only ensure the axial matching length of the assembly bearing in the casing and the end cover, but also ensure the perpendicularity requirements between the fixed part on the casing and the end cover and the center of rotation of the bearing chamber, avoiding the looseness between the bearing and the bearing, thereby causing Noise, which affects the normal operation of the motor.

Description

Automotive Micro Motor Housing

technical field

The invention relates to an automobile micro-motor casing.

Background technique

At present, more and more micro-motors are used in existing passenger cars, such as: the adjustment of the front and rear positions of the car seat, the angle adjustment of the backrest and the seat, the drive of the water spray pump when cleaning the car glass, and the rearview mirror of the car. The direction adjustment, the direction adjustment of the headlights of the car, etc., the performance and safety requirements of the car are getting higher and higher, and when the existing micro-motor is manufactured, most of its shell is machined and formed or a combination of several parts It is realized by forming, the manufacturing cost is high, the processing efficiency is low, and the bearing chamber at the end of the casing is difficult to meet the coaxiality requirement with the positioning center axis of the entire casing, because the fixed part used for bearing fixing has a vertical axis of rotation of the bearing Requirements, machining must be performed at the bottom of the bearing chamber to ensure the tool retraction process, which greatly reduces the axial fit length of the bearing chamber, therefore, due to the characteristics of machining, it is difficult to ensure the axial fit length of the bearing , and ensure the verticality between the fixed part and the center of rotation of the bearing chamber; for the same reason, the bearing chamber at the end of the end cover is also difficult to meet the coaxiality requirements of the positioning center axis of the entire end cover, because the fixed part has a vertical bearing rotation According to the requirements of the axis, machining must be performed at the bottom of the bearing chamber to ensure the tool retraction process, which greatly reduces the axial matching length of the bearing chamber. Therefore, due to the characteristics of machining, it is difficult to ensure the axial direction of the bearing. The matching length ensures the verticality between the fixed part and the center of rotation of the bearing chamber. However, with the bumps of the road, the vibration of the body and the long-term rotation of the car during driving, if there is no axial fit between the end cover and the casing If the length and the perpendicularity between the axial positioning part of the end of the bearing and the center of rotation of the bearing chamber are guaranteed, the bearing will loosen with the casing, causing noise, and some even loose and fall off the bearing, which seriously affects the normal operation of the motor. operation, there are serious safety hazards.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art, and provide an automobile micro-motor casing, which can not only ensure the axial matching length of the assembly bearing in the casing and the end cover, but also ensure the fixing of the casing and the end cover. The verticality requirements between the head and the center of rotation of the bearing chamber avoid the looseness between the bearing and the bearing chamber, which will cause noise and affect the normal operation of the motor.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a kind of automobile micro-motor casing, it comprises:

The casing, one end of the casing is an open end, the other end of the casing is formed with a cylinder bottom, and a casing bearing chamber protruding axially outward and accommodating bearings is arranged on the bottom of the casing, the casing The shell is provided with a notch part coaxial with the rotary shaft of the casing at its open end, and the axially outer end of the bearing chamber of the casing is provided with a first fixing part for fixing the axial end of the bearing. The first fixing part is provided with a first through hole for the extension of the motor shaft, and an axial shaft is provided on the transition zone between the axially outer wall surface of the cylinder bottom and the first radially outer wall surface of the casing bearing chamber. The first groove is recessed inward, and a groove corresponding to the first groove is formed on the transition zone between the axial inner wall surface of the cylinder bottom and the first radial inner wall surface of the casing bearing chamber. A first rib that protrudes toward the inside of the housing and is used to extend the axial effective length of the bearing chamber of the housing;

An end cover, the end cover has a cover body, the cover body is assembled with the seam part of the casing, and the center part of the cover body is provided with an end cover bearing that protrudes axially outward and accommodates the bearing The axially outer end of the bearing chamber of the end cover is provided with a second fixing part for fixing the axial end of another bearing, and the second fixing part is opened with a second passage for the motor shaft to protrude. Hole, on the transition area between the axially outer wall surface of the cover body and the second radially outer wall surface of the end cover bearing chamber, there is a second groove recessed axially inward, and on the cover body The transition area between the axial inner wall surface of the cover body and the second radial inner wall surface of the end cover bearing chamber is formed corresponding to the second groove and protruding toward the casing direction and used to extend the end cover bearing chamber The axial effective length of the second convex rib.

Further, in order to install and position the brush holder in the casing, at least two casing positioning grooves for positioning the brush holder are provided at the open end of the casing, and the axial depth of the casing positioning grooves is smaller than the The axial depth of the spigot portion is deep.

Further, in order to determine the direction in the automatic production process and the fool-proof setting of the process, among all the housing positioning grooves, at least two of the housing positioning grooves have unequal widths in the circumferential direction of the housing.

Further, in order to limit the movement of the stator magnets in the circumferential direction of the housing, at least two positioning parts for limiting the movement of the stator magnets on the housing in the circumferential direction of the housing extend from the middle of the housing to the inside of the housing.

Further, there are two positioning parts, and they form a symmetrical butterfly wing shape in the circumferential direction of the casing. The length L of the positioning part in the axial direction of the casing is less than 15mm. The length h of the inner extension in the direction of extension is less than 10 mm, and the acute angle formed by the intersection of the two positioning parts is no greater than 40°.

Further, in order to limit the movement of the stator magnet in the axial direction of the casing, an axial positioning part for axially positioning the stator magnet on the casing is provided on the circumferential wall of the casing close to the bottom of the cylinder. The first part is a positioning piece punched or punched from outside to inside on the peripheral wall of the casing.

Furthermore, the axial outer wall surface of the cylinder bottom of the casing is an installation work surface, and the installation work surface is provided with connection holes and/or process positioning holes for installation with the driven mechanism.

Further, in order to position the brush holder on the end cover, at least two end cover positioning slots for positioning the brush holder are provided on the end edge of the cover body.

Further, in order to determine the direction in the automatic production process and to prevent the setting of the process, among all the end cap positioning grooves, at least two of the end cap positioning grooves have unequal widths in the circumferential direction of the cover body.

Further, in order to increase the rigidity of the end cover, reduce its elastic deformation, and ensure the verticality of the rotation axis between the cover body and the second radial inner wall surface of the end cover bearing chamber, the axial inner wall surface of the cover body of the cover body is arranged There are grooves recessed axially outward to a certain depth.

After adopting the above technical solution, the first rib of the present invention increases the axial effective length of the housing bearing chamber, greatly improves the installation strength of the bearings in the housing, and effectively prevents the bearings in the housing from falling off Phenomenon; at the same time, a first fixing part is provided on the axially outer end of the housing bearing chamber, and a first through hole is provided on the first fixing part, so that during the process of thinning and stretching of the side wall of the housing bearing chamber, Due to the relatively large deformation, the coaxiality requirements between the first radial inner wall surface of the housing bearing chamber and the first radial outer wall surface are guaranteed, and the first radial inner wall surface of the first fixing part and the housing bearing chamber is ensured. The verticality of the rotation axis of the wall surface, and more importantly, since the first through hole is provided on the first fixed part, when the side wall of the housing bearing chamber is thinned and stretched and the first fixed part is formed at the same time, there is a large A good material release area, so that the length of the transition zone between the first radially inner wall surface of the housing bearing chamber and the first fixing part is greatly reduced by less than 0.2 while ensuring that the side wall of the housing bearing chamber is not strained. millimeters, thereby effectively increasing the bearing axial length of the casing bearing chamber; similarly, the second rib of the present invention increases the axial effective length of the bearing chamber of the end cover, which greatly improves the bearing capacity of the bearing in the end cover. The installation strength effectively prevents the bearings in the end cover from falling off; at the same time, a second fixing part is provided on the axially outer end of the bearing chamber of the end cover, and a second through hole is arranged on the second fixing part. During the thinning and stretching process of the side wall of the end cover bearing chamber, due to the relatively large deformation, the coaxiality requirements of the second radially inner wall surface and the second radially outer wall surface of the end cover bearing chamber are guaranteed, and the second radially outer wall surface is also guaranteed. The perpendicularity between the two fixed parts and the second radial inner wall surface of the end cover bearing chamber. More importantly, since the second through hole is provided on the second fixed part, the side wall of the end cover bearing chamber becomes When stretching thinly and forming the second fixed part at the same time, there is a good material release area, so that the second radial direction of the end cover bearing chamber is greatly reduced while ensuring that the side wall of the end cover bearing chamber is not strained. The length of the transition zone between the inner wall surface and the second fixed part is less than 0.2 mm, thus effectively increasing the axial matching length of the bearing in the bearing chamber of the end cover. Through the above measures, the looseness between the bearing and the casing or the end cover is avoided. Noise, which affects the normal operation of the motor.

Description of drawings

Fig. 1 is the perspective view of automobile micro-motor housing shell of the present invention;

Fig. 2 is the structural representation of automobile micro-motor housing shell of the present invention;

Fig. 3 is A-A sectional view of Fig. 2;

FIG. 4 is an enlarged schematic diagram of part B in FIG. 3 .

Fig. 5 is a perspective view one of the automobile micro-motor housing end cover of the present invention;

Fig. 6 is the perspective view two of the automobile micro-motor housing end cover of the present invention;

Fig. 7 is the structural representation of the automobile micro-motor housing end cover of the present invention;

FIG. 8 is a schematic diagram of part C in FIG. 7 .

Detailed ways

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figures 1 to 8, an automotive micro-motor housing includes:

The casing, which is made of a generally hollow cylindrical casing with a bottom by punching, punching, stretching, and stamping a thin steel plate for many times, and one end of the casing is an open end 11. The other end of the casing is formed with a cylinder bottom 12, and the casing bottom 12 is provided with a casing bearing chamber 13 protruding axially outward and accommodating bearings. The casing is provided with a The notch part 16 coaxial with the rotary shaft of the casing, the axially outer end of the casing bearing chamber 13 is provided with a first fixing part 131 for fixing the axial end of the bearing, and the first fixing part 131 is provided with a first through hole 1311 for the extension of the motor shaft, and is provided on the transition zone between the axially outer wall surface 120 of the cylinder bottom 12 and the first radially outer wall surface 130 of the casing bearing chamber 13. A first groove 14 recessed axially inward, and a transition area between the axially inner wall surface 1200 of the cylinder bottom 12 and the first radially inner wall surface 1300 of the casing bearing chamber 13 is formed with The first groove 14 corresponds to the first rib 15 that protrudes toward the inside of the housing and is used to extend the axial effective length of the bearing chamber 13 of the housing; the height of the first rib 15 is less than 1mm;

End cap, the end cap is made into a structure that is generally shaped like a top hat by punching a thin steel plate through multiple times of punching, punching, stretching, and stamping. The end cap has a cover body 21, and the cover body Part 21 is assembled with the mouth part 16 of the casing. The center part of the cover part 21 is provided with an end cover bearing chamber 22 that protrudes axially outward and accommodates the bearing. The axial direction of the end cover bearing chamber 22 The outer end is provided with a second fixing portion 221 for fixing the axial end of another bearing, and the second fixing portion 221 is provided with a second through hole 2211 for extending the motor shaft. On the transition area between the axially outer wall surface 210 of the cover body and the second radially outer wall surface 220 of the end cover bearing chamber 22, a second groove 23 recessed axially inward is provided, and on the cover body portion 21 The transition area between the axial inner wall surface 2100 of the cover body and the second radial inner wall surface 2200 of the end cover bearing chamber 22 is formed on the transition area corresponding to the second groove 23 and protruding toward the casing direction and used to extend the end cover. The axially effective length of the second rib 24 of the bearing chamber 22 . The length of the second rib 4 in the axial direction of the end cover bearing chamber 22 is less than 1 mm.

The first rib 15 of this embodiment increases the axial effective length of the casing bearing chamber 13, greatly improves the installation strength of the bearing in the casing, and effectively prevents the falling off of the bearing in the casing; at the same time The axially outer end of the casing bearing chamber 13 is provided with a first fixing portion 131, and the first fixing portion 131 is provided with a first through hole 1311, so that the side wall of the casing bearing chamber 13 is thinned and stretched. , because the deformation is relatively large, that is, the coaxiality requirement between the first radially inner wall surface 1300 and the first radially outer wall surface 130 of the housing bearing chamber 13 is ensured, and the first fixing part 131 and the housing bearing chamber 13 are ensured. The verticality of the rotation axis of the first radial inner wall surface 1300, more importantly, because the first through hole 1311 is provided on the first fixing part 131, the side wall of the housing bearing chamber 13 is thinned and stretched When the first fixing part 131 is formed at the same time, there is a good material release area, which greatly reduces the first radial inner diameter of the housing bearing chamber 13 while ensuring that the side wall of the housing bearing chamber 13 is not strained. The length of the transition zone between the wall surface 1300 and the first fixing part 131 is less than 0.2 millimeters, thereby effectively increasing the bearing axial matching length of the housing bearing chamber 13; similarly, the second rib 24 of the present invention increases the end cover bearing The axial effective length of the chamber 22 greatly improves the installation strength of the bearings in the end cover, effectively preventing the bearings in the end cover from falling off; at the same time, the axial outer end of the end cover bearing chamber 22 is provided with a second Two fixed parts 221, and the second fixed part 221 is provided with a second through hole 2211, in the process of such end cover bearing chamber 22 side wall thinning and stretching, due to the relatively large deformation, the bearing chamber 22 of the end cover is ensured. The coaxiality requirements of the second radially inner wall surface 2200 and the second radially outer wall surface 220, and the perpendicularity of the rotation axis of the second fixed part 221 and the second radially inner wall surface 2200 of the end cover bearing chamber 22 , more importantly, since the second through hole 2211 is provided on the second fixing part 221, when the side wall of the end cover bearing chamber 22 is thinned and stretched and the second fixing part 221 is formed at the same time, there is a good material In this way, the length of the transition zone between the second radially inner wall surface 2200 of the end cover bearing chamber 22 and the second fixing part 221 is greatly reduced while ensuring that the side wall of the end cover bearing chamber 22 is not damaged. 0.2 mm, thereby effectively increasing the axial matching length of the bearing in the end cover bearing chamber 22. Through the above measures, the looseness between the bearing and the casing or the end cover can avoid noise and affect the normal operation of the motor.

In the above structure, the casing bearing chamber 13 is formed by thinning and stretching the bottom material of the casing, and the wall thickness of the casing bearing chamber 13 is 40%-50% of the wall thickness of the bottom material. The end cover bearing chamber 22 is formed by thinning and stretching the material of the end cover, and the wall thickness of the end cover bearing chamber 22 is 40%-50% of the wall thickness of the material of the cover body portion 21 .

The notch portion 16 is formed by thinning and stretching the base material near the opening end 11 of the casing, and the wall thickness of the notch portion 16 is 25%-40% of the base material thickness. The out-of-roundness of the seam part 16 is less than 0.02mm of the out-of-roundness of the inner wall surface 1600 of the cylindrical part of the casing, and the coaxiality error between it and the inner wall surface 1600 of the cylindrical part is less than Φ0.05mm;

As shown in Figure 1, at least two casing positioning grooves 111 for positioning the brush holder are provided on the opening end 11 of the casing, and the axial depth of the casing positioning grooves 111 is deeper than that of the notch part. The axial depth of 16 is deep.

In order to determine the direction in the automated production process and the fool-proof setting of the process, as shown in Figure 1, among all the casing positioning grooves 111, at least two casing positioning grooves 111 have different widths in the circumferential direction of the casing. equal.

As shown in FIG. 3 , at least two positioning portions 17 extending inwardly from the middle of the housing are used to limit the movement of the stator magnet on the housing in the circumferential direction of the housing.

As shown in Figure 2, two positioning parts 17 are provided, and form a symmetrical butterfly wing shape in the circumferential direction of the housing. The length L of the positioning part 17 in the axial direction of the housing is less than 15 mm. The length h of the positioning portion 17 in the extending direction extending into the casing is less than 10mm, and the acute angle formed by the intersection of the two positioning portions 17 is not greater than 40°.

As shown in Figure 3, an axial positioning part 18 for axial positioning of the stator magnet on the casing is provided on the circumferential wall of the casing close to the bottom 12 of the casing, and each stator magnet corresponds to the axial positioning part 18 No less than two, the axial positioning part 18 of each stator magnet is a positioning piece stamped or punched from the outside to the inside on the circumferential wall of the casing, and the axial positioning part 18 of each stator magnet is It is completed in the same process step to ensure the dimensional accuracy of the axial positioning portion 18 of each stator magnet and the relative dimensional accuracy between the axial positioning portions 18 of different stator magnets.

As shown in Figure 2, the axial outer wall surface 120 of the cylinder bottom 12 of the casing is the installation work surface, the flatness error of the axial outer wall surface 120 of the cylinder bottom 12 is not more than 0.08mm, and the cylinder bottom 12 The parallelism error between the axially outer wall surface 120 and the axially stepped surface 160 forming the spigot 16 is less than 0.1 mm, and the installation working surface is provided with a connection hole 121 for installation with the driven mechanism, and the connection hole 121 is Threaded hole, the threaded hole of present embodiment is provided with two, but its quantity is not limited to this, described installation working surface is also provided with process positioning hole 122, and the process positioning hole 122 of present embodiment is provided with two, but Its number is not limited to this, and the connecting holes 121 are evenly distributed on the circumference with the center axis of rotation of the first radially outer wall surface of the housing bearing chamber 13 as the center, and are arranged symmetrically, while the process positioning holes 122 are evenly distributed on the circumference of the housing. The rotary axis of the inner wall surface of the cylindrical part is on the circumference of the center of the circle, and is arranged symmetrically.

The axially outer end surface of the cylinder bottom 22 is calculated through the forming and deformation of the stamped material, and the elastic deformation compensation amount of the material is reserved on the die of the mold. The data of the compensation amount is obtained from the experiment according to the physical characteristics of the selected material. What is used in the embodiment is the electro-galvanized sheet (SECD-O) of Shanghai Baosteel, and its compensation amount is between 3% and 5%.

As shown in FIGS. 5 and 6 , at least two end cover positioning grooves 211 for positioning the brush holder are provided on the end edge of the cover body 21 . The end cap positioning grooves 211 are evenly distributed on the circumference with the end cap axis as the center. In this embodiment, there are two end cap positioning grooves 211 , but it is not limited thereto.

In order to determine the direction in the automated production process and the fool-proof setting of the process, as shown in FIGS. The circumferential widths are not equal.

As shown in FIG. 6 , the axial inner wall surface 2100 of the cover portion 21 is provided with a groove 212 recessed axially outward to a certain depth. The groove 212 is arranged concentrically with the bearing chamber 22 of the end cover. The setting of the groove 212 increases the rigidity of the end cover, reduces its elastic deformation, and ensures the verticality requirement of the rotation axis of the cover body 21 and the radial inner wall surface 2200 of the end cover bearing chamber 22 .

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. a kind of automobile micromotor shell, which is characterized in that it includes：

One end of casing, the casing is open end (11), and the other end of the casing is formed with a bottom (12), the cylinder bottom (12) the casing bearing chamber (13) for projecting axially outward and accommodating bearing is provided on, the casing is arranged in its open end (11) There are the seam allowance portion (16) coaxial with the rotating shaft of casing, the axial outer end portion of the casing bearing chamber (13) to be provided with for fixing The first fixed part (131) of the axial end portion of bearing is provided with first stretched out for motor shaft on first fixed part (131) Through-hole (1311), cylinder bottom (12) cylinder lower shaft to the first radial outer wall face of outside wall surface (120) and casing bearing chamber (13) (130) be provided with the first axially inwards recessed dent slot (14) in the transition region between, and the cylinder lower shaft of cylinder bottom (12) to It is formed in transition region between internal face (1200) and the first inner radial wall face (1300) of casing bearing chamber (13) and first Dent slot (14) it is corresponding and protruded to casing internal and axial effective length for extending casing bearing chamber (13) it is first convex Muscle (15)；

End cap, the end cap have lid portion (21), and the lid portion (21) and seam allowance portion (16) cooperation of casing are assembled, described The centre in lid portion (21) is provided with the bearing with end cover room (22) for projecting axially outward and accommodating bearing, the bearing with end cover The axial outer end portion of room (22) is provided with the second fixed part (221) of the axial end portion for fixing another bearing, and described second The second through-hole (2211) stretched out for motor shaft is provided on fixed part (221), the lid axial direction outside wall surface in lid portion (21) (210) it is provided in the transition region between the second radial outer wall face (220) of bearing with end cover room (22) recessed axially inwards Second dent slot (23), and second in the lid axial direction internal face (2100) of lid portion (21) and bearing with end cover room (22) is radial Be formed in transition region between internal face (2200) it is corresponding with second dent slot (23) and to casing direction protrude and for prolonging The second convex ribs (24) of the axial effective length of long bearing with end cover room (22)；

Wherein, transition region between the first inner radial wall face (1300) and the first fixed part (131) of casing bearing chamber (13) Length is less than 0.2 millimeter；

The length of transition region between second inner radial wall face (2200) of bearing with end cover room (22) and the second fixed part (221) is small In 0.2 millimeter.

2. automobile micromotor shell according to claim 1, it is characterised in that：It is arranged in the open end (11) of the casing There are at least two casing locating slots (111) for brushgear housing positioning, described in the axial depth ratio of the casing locating slot (111) The axial depth in seam allowance portion (16) is deep.

3. automobile micromotor shell according to claim 2, it is characterised in that：In all casing locating slots (111), Width of the wherein at least two casing locating slot (111) in casing circumferential direction is unequal.

4. automobile micromotor shell according to claim 1, it is characterised in that：The middle part of the casing extends into casing Go out at least two for limiting the magnets of stator on casing in the positioning region that the week of casing moves up (17).

5. automobile micromotor shell according to claim 4, it is characterised in that：There are two positioning region (17) settings, And it is formed in symmetrical butterfly wing-like in the circumferential direction of casing, length L of the positioning region (17) in the axial direction of casing is small It is less than 10mm, two positioning regions (17) in 15mm, length h of the positioning region (17) on the extending direction extended into casing Intersection is formed by acute angle and is not more than 40 °.

6. automobile micromotor shell according to claim 1, it is characterised in that：In casing close to the circle of the cylinder bottom (12) It is provided on peripheral wall for the axially position portion (18) to the magnets of stator axially position on casing, the axially position portion (18) The locating plate obtained for the ecto-entad punching press in the circumferential wall of casing or punching.

7. automobile micromotor shell according to claim 1, it is characterised in that：The cylinder lower shaft at the cylinder bottom (12) of the casing It is installment work face to outside wall surface (120), the connecting hole for being installed with driven-mechanism is provided on the installment work face (121) and/or technology hole (122).

8. automobile micromotor shell according to claim 1, it is characterised in that：It is arranged on the ora terminalis of the lid portion (21) There is at least two end cap locating slots (211) for brushgear housing positioning.

9. automobile micromotor shell according to claim 8, it is characterised in that：In all end cap locating slots (211), Width of the wherein at least two end cap locating slot (211) in the circumferential direction of lid portion (21) is unequal.

10. automobile micromotor shell according to claim 1, it is characterised in that：The lid of the lid portion (21) is axial Internal face (2100) is provided with the groove (212) for being recessed certain depth axially outward.