Motor assembly

Abstract

The utility model discloses a motor assembly, comprising a motor main body comprising a motor shaft; the cooling system comprises a power source; the rotating shaft connecting piece comprises a connecting shaft body and a flange part annularly arranged on the periphery of one end of the connecting shaft body; wherein the flange part abuts against the end portion of the motor shaft, a fastener is connected between the flange part and the motor shaft, and the other end of the connecting shaft body is connected with the input end of the power source. By adopting the above structure, high integration of the cooling system and the motor can be ensured, and the increase of the motor shaft can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor cooling technical field, especially a motor assembly. BACKGROUND

[0002] Various losses will be caused in the motor operation process, thereby causing the motor heating. In order to improve the working efficiency of the motor, the motor is usually equipped with a cooling system for cooling and heat dissipation of the motor, and the cooling system mainly includes an oil cooling system, a water cooling system and a separate cooling system. The existing motor usually only extends the motor shell at one end to be connected with the load, so as to make the cooling system and the motor highly integrated and reduce the production cost, and the other end of the motor shaft of part of the motor also extends the motor shell body to be connected with the power source of the cooling system. When the motor operates, it can drive the load and the power source to operate simultaneously. However, the above-mentioned mode causes the motor shaft to be too long, the processing cost is high, and the assembly and disassembly of the parts outside the motor shaft are not facilitated.

[0003] Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. INVENTION CONTENTS

[0004] The utility model discloses a motor assembly, can ensure the cooling system and the motor highly integrated while avoiding the growth motor shaft.

[0005] The utility model discloses a motor assembly, including:

[0006] Motor main part, including motor shaft;

[0007] Cooling system, including power source;

[0008] Rotating shaft connecting piece, including connecting shaft body and the flange portion of the ring of the connecting shaft body one end outer periphery;

[0009] Wherein, the flange portion is in abutment on the end of motor shaft, and the fastener is connected between the flange portion and the motor shaft, and the other end of the connecting shaft body is connected with the input end of the power source.

[0010] Further, when the flange portion is in abutment with the motor shaft, the connecting shaft body is suitable for the plug-in positioning with the motor shaft.

[0011] Further, the end face of the connecting shaft body one end and the end face of the flange portion form convex stop, and the motor shaft includes connecting end, the plug-in hole is formed in the connecting end from its end face to the inside recess, the plug-in hole and the end face of the connecting end form recess stop, and the recess stop is matched with the convex stop.

[0012] Further, an outer periphery of the connecting shaft body away from the motor shaft is formed with a spline matched with an input end of the power source.

[0013] Further, the motor shaft includes a connecting end adjacent to the connecting shaft body, and an outer periphery of the connecting end is formed with a third shaft shoulder.

[0014] Further, the flange portion is a circular ring structure coaxial with the connecting shaft body, and an outer diameter of the flange portion is greater than an outer diameter of the connecting end.

[0015] Further, the motor body includes:

[0016] A motor shell includes a shell body and an end cover, the shell body has an open side, and the end cover is detachably capped on the open side of the shell body.

[0017] A power module is installed in the motor shell and in transmission connection with the motor shaft.

[0018] The end cover is formed with a receiving cavity receiving the shaft connecting piece and the connecting end, the receiving cavity is recessed inward from an end face toward the shell body, an installation gap is formed between the receiving cavity and the shaft connecting piece, and / or an installation gap is formed between the receiving cavity and the connecting end.

[0019] Further, the receiving cavity includes a first cavity corresponding to the connecting end, a periphery of the outer ring of the bearing is fixed to an inner wall of the first cavity, and the first cavity is formed with a first step abutting against an end face of the outer ring of the bearing.

[0020] Further, the receiving cavity includes a second cavity corresponding to the connecting shaft body, the motor body includes a rotary transformer received in the second cavity, the rotary transformer includes a rotary transformer rotor fixed to the connecting shaft body and a rotary transformer stator fixed to an inner wall of the second cavity.

[0021] Further, an outer periphery of the connecting shaft body is formed with a second shaft shoulder, the rotary transformer rotor is axially abutted against the second shaft shoulder, the second cavity is formed with a second step, and the rotary transformer stator is axially abutted against the second step.

[0022] Compared with the prior art, the utility model has following beneficial effects: the utility model discloses a connecting piece of rotating shaft is arranged between motor shaft and power source, can avoid increasing motor shaft, has reduced the processing cost of motor shaft, and can dismount according to need, benefit the assembly and dismounting of each component outside motor shaft, the connecting piece of rotating shaft includes connecting axle body and the flange portion of ring and is arranged outside connecting axle body, and the end portion of motor shaft can be located with flange portion, and the end portion of motor shaft and flange portion are fastened through fastener, can effectively ensure the connecting strength and position accuracy of both. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is the partial section schematic diagram of motor assembly of the utility model.

[0024] Fig. 2 It is the three-dimensional structure schematic diagram of connecting piece of rotating shaft of the utility model.

[0025] Fig. 3 It is the front view of connecting piece of rotating shaft of the utility model.

[0026] Fig. 4 It is the right view of connecting piece of rotating shaft of the utility model.

[0027] BRIEF DESCRIPTION OF DRAWINGS:

[0028] 100, connecting piece of rotating shaft, 110, connecting axle body, 111, first part, 112, second part, 113, spline, 114, first shaft shoulder, 115, third part, 116, second shaft shoulder, 117, fourth part, 118, fifth part, 120, flange portion, 121, first connecting hole, 130, convex stop, 200, motor main body, 210, motor shaft, 211, connecting end, 212, plug-in hole, 213, concave stop, 214, third shaft shoulder, 220, rotary transformer, 221, rotary transformer rotor, 222, rotary transformer stator, 230, end cover, 231, first chamber, 232, first step portion, 233, second chamber, 234, second step portion, 240, bearing, 300, power source, 400, fastener. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. It can be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, not all structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0030] The terms "including", "containing", "having" and variations thereof herein are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that comprises a list of steps or units are not necessarily limited to those listed steps or units but can include additional steps or units not expressly listed or can include steps or units inherent to such process, method, product or apparatus.

[0031] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment. It is explicitly contemplated that embodiments described herein can be combined with each other.

[0032] Please refer to Figs. 1 to 4 As shown in the drawings, the motor assembly corresponding to a preferred embodiment of the application comprises a motor body 200, a cooling system and a rotating shaft connecting piece 100. The rotating shaft connecting piece 100 is connected between the motor body 200 and a power source 300 of the cooling system, so that the motor body 200 can drive the power source 300 to cool the motor body 200 during driving load operation, thereby realizing high integration of the cooling system and the motor body 200 and reducing cost. The power source 300 can be an oil pump, a water pump, a fan or the like, which is not limited in the application.

[0033] Further, the rotating shaft connecting piece 100 comprises a connecting shaft body 110 and a flange portion 120 arranged around the outer periphery of the connecting shaft body 110. The connecting shaft body 110 is coaxial with a motor shaft 210 of the motor body 200. An end of the connecting shaft body 110 away from the motor shaft 210 is connected to an input end of the power source 300. The flange portion 120 is close to the other end of the connecting shaft body 110 and is adapted to abut against an end portion of the motor shaft 210. At least one first connecting hole 121 is formed through the flange portion 120 along the axial direction of the connecting shaft body 110. An end portion of the motor shaft 210 is provided with a second connecting hole (not shown in the drawings) corresponding to the first connecting hole 121. A fastener 400 is connected between the first connecting hole 121 and the second connecting hole.

[0034] The utility model discloses a motor shaft 210 and power source 300 between the setting of the connecting piece 100 of rotation axis, can avoid the growth motor shaft 210, has reduced the processing cost of motor shaft 210, and can be disassembled according to the need, the assembly and disassembly of motor shaft 210 outer each component are favorable, the connecting piece 100 of rotation axis includes connecting axle body 110 and the flange portion 120 of ring setting in connecting axle body 110 outside, the flange portion 120 can with the end of motor shaft 210 abut, and the fastener 400 is realized fastening between the end of flange portion 120 and motor shaft 210, can effectively ensure the connecting strength and position accuracy of both.

[0035] Further, in the embodiment, the fastener 400 is specifically a threaded member such as a bolt or a screw, and the fastener 400 corresponds to the first connecting hole 121 and / or the second connecting hole one by one. In an embodiment, only the second connecting hole is a threaded hole matched with the fastener 400, the fastener 400 can be installed into the first connecting hole 121 from the end surface of the flange portion 120 away from the motor shaft 210, and is screwed with the second connecting hole to fasten the flange portion 120 and the motor shaft 210. In other embodiments, the first connecting hole 121 and the second connecting hole can also be threaded holes, and the fastener 400 is screwed with the first connecting hole 121 and the second connecting hole at the same time. Preferably, the first connecting hole 121 has a plurality of numbers and is uniformly distributed along the circumference of the connecting axle body 110, which can improve the stability of the connecting axle body 110 after assembly and facilitate the alignment of the first connecting hole 121 and the second connecting hole.

[0036] Further, when the flange portion 120 abuts against the motor shaft 210, the connecting axle body 110 is adapted to be inserted and positioned with the motor shaft 210, that is, before the connecting axle body 110 is locked to the motor shaft 210, the connecting axle body 110 can be centrally positioned with the motor shaft 210 to ensure the coaxiality of the two, to ensure the reliable transmission of the connecting piece 100 of rotation axis, and also facilitate the same shaft of the first connecting hole 121 and the second connecting hole, and facilitate the connection of the fastener 400 between the first connecting hole 121 and the second connecting hole.

[0037] Specifically, the connecting shaft body 110 includes a first portion 111 close to the motor shaft 210, and an end of the connecting shaft body 110 close to the motor shaft 210 is located on the first portion 111. The flange portion 120 is annularly arranged outside the first portion 111, and when the flange portion 120 abuts against the motor shaft 210, the first portion 111 is insertedly connected with the motor shaft 210. An end surface of the first portion 111 towards the motor shaft 210 is protruded relative to an end surface of the flange portion 120, so that the end surfaces of the first portion 111 and the flange portion 120 cooperatively form a convex stop 130. The motor shaft 210 includes a connecting end 211, and the connecting end 211 is recessed inward from the end surface thereof to form an insertion hole 212, and the insertion hole 212 cooperatively forms a recessed stop 213 with the end surface of the connecting end 211, and the recessed stop 213 is adapted to the convex stop 130. Preferably, a distance between the end surface of the first portion 111 and the end surface of the flange portion 120 is not greater than a hole depth of the insertion hole 212, so as to ensure that the flange portion 120 can reliably abut against the end surface of the motor shaft 210, and improve the fastening effect.

[0038] Indeed, in other embodiments, the recessed stop 213 can be formed on the first portion 111, and a flange is annularly arranged on an outer periphery of the connecting end 211 to cooperatively form the convex stop 130 with the end surface of the connecting end 211. Compared with the structure of directly using the flange portion 120 to cooperatively form the convex stop 130 with the first portion 111, the structure is obviously simpler.

[0039] When the connecting shaft body 110 is installed, the first portion 111 is inserted into the insertion hole 212 until the flange portion 120 abuts against the motor shaft 210, so as to realize the positioning of the connecting shaft body 110 in the axial and radial directions. Then, the connecting shaft body 110 is rotated so that the first connecting hole 121 and the second connecting hole correspond to each other, and then the fastener 400 is installed from the end surface of the flange portion 120 away from the motor shaft 210 to the first connecting hole 121 and the second connecting hole, so as to realize the fastening of the connecting shaft body 110 and the motor shaft 210.

[0040] Further, the connecting shaft body 110 includes a second portion 112 away from the motor shaft 210, and the other end of the connecting shaft body 110 is located on the second portion 112. The second portion 112 has a spline 113 formed on an outer periphery thereof, and the spline 113 is adapted to the input end of the power source 300, so as to ensure that the connecting shaft body 110 reliably drives the power source 300 to transmit power.

[0041] Preferably, the connecting shaft body 110 is a stepped shaft, and the first shaft shoulder 114 is formed on the connecting shaft body 110 and adapted to axially position the power source 300. Specifically, the connecting shaft body 110 comprises a third portion 115 between the first portion 111 and the second portion 112, the second portion 112 is connected to one end of the third portion 115, and the other end is one end of the connecting shaft body 110. The outer diameter of the third portion 115 is larger than the outer diameter of the spline 113, and the first shaft shoulder 114 is formed between the second portion 112 and the spline 113. By arranging the third portion 115, on the one hand, it is convenient to form the first shaft shoulder 114 for limiting the power source 300, and on the other hand, the third portion 115 can also provide installation space to install bearing structure to guide the smooth and reliable rotation of the connecting shaft body 110.

[0042] Further, the second shaft shoulder 116 is formed on the connecting shaft body 110, and the motor body 200 comprises a rotary transformer 220, which can be installed on the connecting shaft body 110 and axially positioned by the second shaft shoulder 116. Compared with the conventional rotary transformer 220 arranged on the motor shaft 210, the structure of the utility model can further shorten the length of the motor shaft 210, and the rotary transformer 220 is closer to the end of the motor body 200 in the axial direction, and is more convenient to disassemble and assemble.

[0043] Specifically, the connecting shaft body 110 comprises a fourth portion 117 and a fifth portion 118, both ends of the fourth portion 117 are connected to the other end of the third portion 115 and one end of the fifth portion 118 respectively, and the other end of the fifth portion 118 is connected to one end of the first portion 111. The outer diameter of the fifth portion 118 is larger than the outer diameter of the fourth portion 117, and the second shaft shoulder 116 is formed between the fourth portion 117 and the fifth portion 118. The rotary transformer 220 comprises a rotary transformer rotor 221 and a rotary transformer stator 222 coaxially arranged outside the rotary transformer rotor 221, the inner diameter of the rotary transformer rotor 221 is matched with the outer diameter of the fourth portion 117, the rotary transformer rotor 221 is arranged in the connecting shaft body 110 from the end of the second portion 112 and fixedly arranged outside the fourth portion 117, the second shaft shoulder 116 axially positions the rotary transformer rotor 221, and the rotary transformer stator 222 is fixed in the motor shell of the motor body 200.

[0044] The utility model discloses by arranging the fifth portion 118, on the one hand, the second shaft shoulder 116 can be formed, and on the other hand, the rotary transformer rotor 221 arranged on the fourth portion 117 is spaced apart from the flange portion 120 by a certain distance, thereby forming a gap for accommodating the fastener 400.

[0045] In other embodiments, the end face of the flange portion 120 away from the motor shaft 210 can also be concave to form a counterbore corresponding to the first connecting hole 121, and the cap portion of the fastener 400 can be accommodated in the counterbore, thereby avoiding a large protrusion of the fastener 400 relative to the flange portion 120, so that the axial length of the fifth portion 118 can be set smaller, and the compactness of the shaft connecting piece 100 is improved.

[0046] Preferably, the outer diameter of the fourth portion 117 is larger than the outer diameter of the third portion 115, so as to facilitate the smooth passage of the rotary rotor 221 through the second portion 112 and the third portion 115, and an axial shoulder can also be formed between the third portion 115 and the fourth portion 117, which facilitates the axial positioning of the bearing structure when the third portion 115 is installed.

[0047] Further, the end face of the flange portion 120 away from the motor shaft 210 is flush with the end of the first portion 111 away from the motor shaft 210, and the fifth portion 118 is in contact with both the end face of the flange portion 120 away from the motor shaft 210 and the end of the first portion 111, so that the overall compactness of the connecting shaft body 110 is improved. The outer contour of the flange portion 120 can be circular, square, etc., which is not limited in the present application. Preferably, in the present embodiment, the flange portion 120 is a circular ring structure coaxial with the connecting shaft body 110, which facilitates the installation of the connecting shaft body 110.

[0048] Further, in order to improve the stability of the motor shaft 210 during rotation, the motor body 200 usually has a bearing 240 arranged outside the connecting end 211, and the motor shaft 210 has a third shoulder 214 at the connecting end 211, and when the bearing 240 is installed to a predetermined position from the end of the connecting end 211, the inner ring end face of the bearing 240 is in contact with the third shoulder 214.

[0049] In addition, in order to improve the stability of the bearing 240 after installation, the motor body 200 also has a limiting sleeve arranged outside the motor shaft 210, so that the inner ring of the bearing 240 is abutted between the third shoulder 214 and the limiting sleeve. The above structure makes the installation process of the motor body 200 very complex.

[0050] Preferably, in the present embodiment, the outer diameter of the flange portion 120 is larger than the outer diameter of the connecting end 211, and when the connecting shaft body 110 is installed on the motor shaft 210, the flange portion 120 is adapted to abut against the inner ring of the bearing 240, so that the inner ring of the bearing 240 is axially limited between the flange portion 120 and the third shoulder 214, which improves the reliability of the bearing 240, avoids the addition of an additional limiting sleeve on the motor shaft 210, simplifies the structure, and facilitates installation.

[0051] Further, the motor body 200 further comprises a motor shell (not shown in the figure) and a power module (not shown in the figure) installed in the motor shell, the motor shaft 210 is connected to the power module to rotate under the driving of the power module, the power module is specifically composed of a stator, a rotor and the like, which is a well-known structure, and the utility model does not make superfluous repetition here. The motor body 200 can be an axial motor structure or a radial motor structure, which is not limited in the utility model. The motor shell comprises a shell body and an end cover 230, the shell body has an open side, and the end cover 230 is detachably capped on the open side of the shell body. The power module is installed in the shell body from the open side of the shell body, and is in driving connection with the motor shaft 210.

[0052] Preferably, the end cover 230 is formed with a receiving cavity for accommodating the shaft connecting piece 100 and the connecting end 211, the receiving cavity is recessed inward from the end face towards the shell body, and the receiving cavity and the shaft connecting piece 100 form an installation gap therebetween, and / or the receiving cavity and the connecting end 211 form an installation gap therebetween. By adopting the above structure, the parts of the motor assembly that need to be installed on the rotating part can be accommodated in the installation gap, thereby saving the installation space inside the shell body and improving the installation adaptability.

[0053] Specifically, in the embodiment, the receiving cavity comprises a first chamber 231 corresponding to the connecting end 211, and the first chamber 231 is used for accommodating the bearing 240. The inner contour of the first chamber 231 is circular, and the inner diameter is greater than the outer diameter of the connecting end 211. The peripheral side of the outer ring of the bearing 240 is fixed to the inner wall of the first chamber 231, preferably by interference fit. By fixing the bearing 240 to the first chamber 231, the internal space of the shell body can be effectively saved, and the bearing 240 is more convenient to disassemble and assemble.

[0054] The first chamber 231 is an open side of the receiving cavity on one side in the axial direction, the bearing 240 can be loaded into the first chamber 231 from the open side, and the first chamber 231 is formed with a first step portion 232 on the other side in the axial direction, and the outer ring end face of the bearing 240 is adapted to abut against the first step portion 232 to axially limit the bearing 240. The first step portion 232 and the flange portion 120 are located on the same side, and when the end cover 230 is installed on the shell body, the first step portion 232 can push against the outer ring end face of the bearing 240 to tightly abut the bearing 240 against the third shaft shoulder 214, further improving the stability of the bearing 240 after installation.

[0055] Further, the accommodating cavity comprises a second cavity 233 corresponding to the connecting shaft body 110, and the resolver 220 is accommodated in the second cavity 233. The inner contour of the second cavity 233 is also circular, and the inner diameter is greater than the outer diameter of the connecting shaft body 110. The second cavity 233 is connected with the first cavity 231 at one axial side, so that the resolver 220 can enter the second cavity 233 through the first cavity 231. The resolver 220 comprises a resolver rotor 221 fixed with the connecting shaft body 110 and a resolver stator 222 fixed with the inner wall of the second cavity 233. Preferably, the connecting shaft body 110 and the resolver rotor 221 and the resolver stator 222 and the second cavity 233 are connected through interference fit.

[0056] In the embodiment, the inner diameter of the second cavity 233 is smaller than the inner diameter of the first cavity 231, so that a first step portion 232 is formed between the second cavity 233 and the first cavity 231. The other side of the second cavity 233 is formed with a second step portion 234, and the resolver stator 222 is axially abutted against the second step portion 234, so as to facilitate the positioning installation of the resolver stator 222.

[0057] Further, the power source 300 can be fixed inside the end cover 230 or outside the end cover 230, which is not limited in the utility model, and when the power source 300 is fixed outside the end cover 230, the end cover 230 is provided with a avoiding hole, and one end of the connecting shaft body 110 extends out of the end cover 230 through the avoiding hole, so as to be connected with the power source 300.

[0058] The above description is only the embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation using the content of the specification and the drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. An electric machine assembly, characterized by include: The motor body (200) includes the motor shaft (210); Cooling system, including power source (300); The rotating shaft connector (100) includes a connecting shaft body (110) and a flange portion (120) circumferentially disposed on one end of the connecting shaft body (110); The flange (120) abuts against the end of the motor shaft (210), and a fastener (400) is connected between the flange (120) and the motor shaft (210). The other end of the connecting shaft (110) is connected to the input end of the power source (300).

2. The electric machine assembly of claim 1, wherein, When the flange (120) abuts against the motor shaft (210), the connecting shaft (110) is adapted to be inserted and positioned with the motor shaft (210).

3. The electric machine assembly of claim 2, wherein, One end of the connecting shaft (110) and the end face of the flange (120) cooperate to form a convex stop (130). The motor shaft (210) includes a connecting end (211). The connecting end (211) has a recessed insertion hole (212) formed from its end face. The insertion hole (212) cooperates with the end face of the connecting end (211) to form a concave stop (213). The concave stop (213) is adapted to the convex stop (130).

4. The motor assembly as described in claim 1, characterized in that, The outer periphery of the connecting shaft (110) away from the motor shaft (210) has a spline (113) adapted to the input end of the power source (300).

5. The motor assembly as described in claim 1, characterized in that, The motor shaft (210) includes a connecting end (211) adjacent to the connecting shaft body (110), and a third shoulder (214) is formed outside the connecting end (211). The motor body (200) includes a bearing (240) sleeved outside the connecting end (211), and the inner ring of the bearing (240) abuts between the flange (120) and the third shoulder (214).

6. The motor assembly as described in claim 5, characterized in that, The flange (120) is a ring-shaped structure coaxial with the connecting shaft (110), and the outer diameter of the flange (120) is larger than the outer diameter of the connecting end (211).

7. The motor assembly as described in claim 5, characterized in that, The motor body (200) includes: The motor housing includes a housing body and an end cap (230), the housing body having an open side, and the end cap (230) being detachably sealed to the open side of the housing body; The power module is installed inside the motor housing and is connected to the motor shaft (210) for transmission. The end cap (230) has a receiving cavity that accommodates the rotating shaft connector (100) and the connecting end (211). The receiving cavity is recessed inward from the end face facing the housing body. An installation gap is formed between the receiving cavity and the rotating shaft connector (100), and / or an installation gap is formed between the receiving cavity and the connecting end (211).

8. The motor assembly as described in claim 7, characterized in that, The receiving cavity includes a first chamber (231) corresponding to the connecting end (211), the periphery of the outer ring of the bearing (240) is fixed to the inner wall of the first chamber (231), and the first chamber (231) has a first stepped portion (232) that abuts against the end face of the outer ring of the bearing (240).

9. The motor assembly as described in claim 7, characterized in that, The receiving cavity includes a second chamber (233) corresponding to the connecting shaft (110), and the motor body (200) includes a rotary transformer (220) housed in the second chamber (233). The rotary transformer (220) includes a resolver rotor (221) fixed to the connecting shaft (110) and a resolver stator (222) fixed to the inner wall of the second chamber (233).

10. The motor assembly as described in claim 9, characterized in that, A second shoulder (116) is formed on the outside of the connecting shaft (110), the resolver rotor (221) abuts against the second shoulder (116) axially, the second chamber (233) is formed with a second step (234), and the resolver stator (222) abuts against the second step (234) axially.

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