Adapter assembly for fastening fastener to rotating body

Abstract

The utility model provides an adaptive assembly used for fastening a fastener on a rotating body. The rotating body can rotate around a rotating axis. The adapter assembly includes: a locking member configured to engage a free end of the rotating body and inhibit rotation of the rotating body about a rotation axis; the base part can move towards and away from the base part along the rotation axis but cannot rotate relative to the base part; the torque transmission piece is provided with a first end and a second end, and the first end is configured to be used for being connected with a fastener which is sleeved on the rotating body in advance; and a second end opposite the first end, the second end configured to be disposed in the first receiving bore and to rotate about the central axis, thereby causing the first end to synchronously drive the fastener to rotate about the central axis to fasten to the rotating body. The adapter assembly is low in design cost, convenient to use, high in assembly efficiency, wide in application range and capable of being better used in cooperation with common tools so as to facilitate real-time acquisition and transmission of relevant parameters.

Description

Technical Field

[0001] The utility model relates to an adapter component, in particular to an adapter component used for fastening a fastener. Background Art

[0002] In an air compressor, a fastener (such as a nut) is usually used to fasten the rotor shaft of the rotor assembly to properly position the impeller on the rotor shaft. Since the rotor assembly (especially the rotor shaft) is a freely rotating component (part), when fastening the fastener thereon, the rotor shaft needs to be fixed, otherwise, the fastening operation will be difficult to achieve the fastening effect due to the follow-up rotation of the rotor shaft.

[0003] In previous operations, the operator usually holds the rotor shaft with one hand and uses the other hand to operate a common tool such as a torque wrench to apply torque to the fastener to achieve fastening of the fastener. However, this fastening operation cannot control the magnitude of the torque that the fastener ultimately applies to the rotor shaft, that is, the fastening effect of the above fastening operation cannot be quantitatively controlled and can only be determined by the operator's experience. This is not desirable in today's era where the precision control of operations is increasing day by day, because it will lead to a decline in product competitiveness.

[0004] As time goes by, the emergence of digital torque wrenches has solved the problem of data collection and transmission, but its scope of application is narrow, the cost-effectiveness is not high, and because it is implemented through manual operation, the operating efficiency is low.

[0005] The use of a universal tightening gun realizes the real-time acquisition and transmission of operating parameters and can quantitatively ensure the tightening effect of the fastener. However, when using it, it still requires manual (manual or with the help of tools) to fix the rotor shaft, otherwise the tightening operation cannot be completed.

[0006] In current operations, a special tool (e.g., a tightening gun with a special conversion head) has been designed to implement the above-mentioned tightening operation. The use of this special tool can not only realize the real-time acquisition and transmission of operating parameters such as torque data, but also can realize the tightening operation of the fasteners on the rotor shaft while using its own mechanical fixation of the rotor shaft. However, this special tool is not impeccable. Its disadvantage is that the design and development cost of this special tool is high, and the adaptation range is small (it is only suitable for fasteners of a specific size / type), so the cost performance is low. Furthermore, the transmission ratio of the gear set used in this special tool is not 1, so it is necessary to confirm and make necessary corrections to the final transmission ratio of the tool set using it before each use, which has the disadvantage of inconvenience in use.

[0007] In this regard, the industry needs an adapter component that can be used in combination with a universal tool such as a universal tightening gun, so as to fix the rotor shaft while assisting the universal tool in applying the required torque, thereby achieving a fastening effect of fastening the fastener to the rotating body. The use of such an adapter component eliminates the need for designing special tools, has low design, assembly and manufacturing costs, is easy to use, has a wide range of applications, and is cost-effective. Utility Model Content

[0008] In order to achieve one or both of the above purposes, the utility model provides an adapter assembly for fastening a fastener to a rotating body, wherein the rotating body can rotate around a rotation axis.

[0009] The adapter assembly includes a base member, a locking member and a torque transmission member. The base member is provided with a first receiving hole, the central axis of which is configured to be colinear with the rotation axis in use. The locking member is configured to: engage the free end of the rotating body and inhibit the rotation of the rotating body around the rotation axis; and be able to move toward and away from the base member along the rotation axis, but not able to rotate relative to the base member. The torque transmission member has: a first end, the first end is configured to engage the fastener pre-set on the rotating body; and a second end opposite to the first end, the second end is configured to be able to be set in the first receiving hole and rotate around the central axis, thereby causing the first end to synchronously drive the fastener to rotate around the central axis to be fastened to the rotating body.

[0010] According to one embodiment of the utility model, the first end is provided with an engaging portion in the form of a hole or a recess for engaging the fastener; and the second end is provided with a driving portion, which is configured to be arranged in the first receiving hole to receive a driving force from the outside.

[0011] Further, the driving portion is in the form of a sleeve, and a central axis of the sleeve is colinear with a central axis of the first receiving hole.

[0012] Furthermore, the torque transmission member is in the form of a hook-shaped member, and the driving portion extends from a side of the second end facing away from the first end and away from the first end.

[0013] Furthermore, the adapter assembly also includes a bearing member having: an inner ring, which is configured to rotate synchronously with the driving portion of the second end of the torque transmission member; and an outer ring, which is configured to be fixed in the first receiving hole.

[0014] According to another embodiment of the utility model, a fixing member is provided between the inner ring of the bearing member and the driving portion of the torque transmission member to realize synchronous rotation therebetween; and a spacer is provided between the lower end surface of the bearing member and the outer side surface of the second end of the torque transmission member to separate the lower side surface of the base member and the outer side surface of the second end of the torque transmission member by a certain distance.

[0015] Alternatively, the fixing element is in the form of a snap spring and / or the spacer element is in the form of a retaining ring.

[0016] Furthermore, the adapter assembly includes a limit member, which is fixed relative to the base member in a detachable or non-detachable manner, and the limit member is configured to cooperate with the locking member, thereby enabling the locking member to move toward and away from the base member along the central axis, but preventing the locking member from rotating relative to the base member in a plane perpendicular to the central axis.

[0017] According to another embodiment of the present invention, the limiting member is fixed to the lower side of the base member; one end of the limiting member away from the base member can engage with a blocking member to prevent the locking member from falling off the limiting member.

[0018] Alternatively, the limiting member is screwed to the second receiving hole of the base member, and the central axis of the second receiving hole is parallel to the central axis of the first receiving hole; a blocking portion is provided at the end of the limiting member away from the base member to prevent the locking member from falling off the limiting member, wherein the blocking portion is integrally formed with the limiting member or separated from the limiting member.

[0019] According to another embodiment of the utility model, the locking member is provided with: a first locking end, which is configured to receive the free end of the rotating body and is located between the first end and the second end of the torque transmission member; and a second locking end, which is configured to be sleeved on the limiting member, so that it can move toward and away from the base member along the limiting member, but cannot rotate around the limiting member.

[0020] Furthermore, a sheath is provided between the second locking end of the locking member and the limiting member to facilitate movement of the second locking end along the limiting member.

[0021] Furthermore, there is a clearance fit between the sheath and the second locking end and / or between the sheath and the limiting member; and / or the sheath is a graphite sheath.

[0022] According to another embodiment of the utility model, the base member is provided with a mating portion, which is configured to cooperate with a mobile bracket so that the mobile bracket can move the adapter component into place; and / or the adapter component is in the form of a unit assembly that can be transported and / or used as a whole.

[0023] Furthermore, the rotating body is a rotor shaft in a rotor assembly used in an air compressor, and the fastener is an impeller nut used to properly position an impeller in the rotor assembly relative to the rotor shaft.

[0024] The adapter assembly for fastening a fastener to a rotating body according to the utility model has low design cost, is easy to use, has high assembly efficiency, has a wide range of applications, and can be better used in conjunction with common tools to facilitate real-time acquisition and transmission of relevant parameters (for example, torque value or the rotation angle of the fastener relative to the rotor shaft). BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings show several embodiments of the present invention as examples, and throughout the various views, the same or similar reference numerals are used to refer to the same or similar components. In the accompanying drawings:

[0026] Figure 1 It is a front view of an adapter assembly according to the utility model used in combination with a rotor assembly for fastening a fastener to a rotating body.

[0027] Figure 2 yes Figure 1 Exploded bottom view of the structure shown.

[0028] Figure 3A and Figure 3B They are Figure 1 Bottom and top perspective views of a base member used in the adapter assembly shown in FIG.

[0029] Figure 4A and Figure 4B They are Figure 1 Bottom and top perspective views of a torque transmitting member used in the adapter assembly shown in FIG.

[0030] Figure 5A and Figure 5B They are Figure 1 Bottom and top perspective views of a locking member used in an adapter assembly shown in FIG.

[0031] Figure 6 yes Figure 1 Top view of the structure shown.

[0032] Fig. 6A and Figure 6B Along the Figure 6 A cross-sectional view taken along line AA and line BB shown in FIG. DETAILED DESCRIPTION

[0033] The adapter assembly for fastening a fastener to a rotating body of the utility model is described below in conjunction with the accompanying drawings. Although the rotating body will be described below by taking the rotor shaft of the rotor assembly used in the air compressor as an example, it should be understood by those skilled in the art that the rotating body to which the adapter assembly of the utility model is applicable is not limited to the rotor shaft, but may involve any applicable component with a rotating function.

[0034] Figure 1 2 shows an adapter assembly for fastening a fastener to a rotating body according to the present invention, which is used in combination with a rotor assembly. Figure 2 Shows Figure 1 An exploded perspective bottom view of the structure shown.

[0035] See also Figure 1 and Figure 2 The adapter assembly 100 mainly includes a base component 110 , a torque transmission component 120 and a locking component 130 .

[0036] Figure 3A and Figure 3B They are shown respectively Figure 1 The bottom and top perspective views of the base member 110 used in the adapter assembly 100 are shown in FIG. The base member 110 is generally in the shape of a thick plate, and its thickness direction ( Figure 1 The first receiving hole 111 is provided in the longitudinal direction (as shown in FIG. 1 ), and the first receiving hole 111 is in the form of a through hole that penetrates the entire thickness of the base member 110 along the thickness direction, and the first receiving hole 111 is configured to cooperate with the torque transmission member 120, that is, to receive a portion of the torque transmission member 120 (details to follow). In the assembled state, the central axis of the first receiving hole 111 of the base member 110 is configured to be colinear with the rotor shaft 210 of the rotor assembly 200 and the rotation axis of the impeller 220 disposed on the rotor shaft 210. For ease of explanation, these axes are uniformly labeled as axis XX, see Figure 1 .

[0037] As an example, the base member 110 may be provided with a second receiving hole 112. Figure 2 , Figure 3A and Figure 3B In the figure, the second receiving hole 112 is depicted as comprising two longitudinal holes, the central axes X1-X1 and X2-X2 of the two longitudinal holes are respectively parallel to the (central) axis XX of the first receiving hole 111, see Figure 2 .

[0038] In addition, the base member 110 may also be provided with a matching portion 113, for example, for matching with a mobile bracket (not shown in the figure) commonly used in an assembly factory, so that the mobile bracket can drive the base member 110, and then drive the entire adapter assembly 100 to move back and forth in space. Although the matching portion 113 is depicted in the figure as a longitudinal through hole whose central axis is parallel to the (central) axis XX of the first receiving hole 111, the utility model is not limited thereto. According to the specific structure of the mobile bracket actually used, the matching portion may have other corresponding matching structures to achieve a detachable connection with the mobile bracket.

[0039] Figure 4A and Figure 4B They are shown respectively Figure 1 Bottom and top perspective views of a torque transmission member 120 used in the adapter assembly 100 are shown. The torque transmission member 120 is generally in the form of a hook-shaped member and has a first end 121 and a second end 122 opposite the first end 121.

[0040] The first end 121 is provided with an engaging portion 1210 for engaging a fastener ( Figure 2 The fastener F is depicted as a nut in the figure, and the first end 121 (the receiving portion 1210 thereof) is configured so that once the fastener F is received, the first end 121 can only translate relative to the fastener F (or the rotor shaft 210) along the axis XX (in an axial direction), but cannot make relative movement relative to the fastener F, so that when the first end 121 rotates around the axis XX, the fastener F can also be driven to rotate around the axis XX (i.e., around the rotor shaft 210). Although the engaging portion 1210 is described in the figure as a through hole, the utility model is not limited thereto, and the engaging portion 1210 can also be in the form of a notch (similar to a wrench), and the inner contour of the notch matches the outer contour of the fastener F to be engaged.

[0041] The second end 122 is provided with a driving portion 1221 on its outer side (i.e., the side facing away from the first end 121), and the driving portion 1221 extends away from the first end 121. Figure 4A and Figure 4B As shown in , the driving portion 1221 is sleeve-shaped and is configured to be disposed in the first receiving hole 111 of the base member 110. The driving portion 1221 is provided with a coupling port P, which is configured to receive an external driving component (not shown), such as a gun head of a universal tightening gun, so that the driving portion 1221 is driven by the external driving component to rotate around the axis XX in the first receiving hole 111. The above-mentioned rotation of the driving portion 1221 of the second end 122 can cause the first end 121 to synchronously drive the fastener F to rotate around the axis XX, so as to fasten the fastener F to the rotor shaft 210.

[0042] The driving portion 1221 of the second end 122 is positioned in the first receiving hole 111 by means of a bearing member B (see Figure 2 ) to achieve this. The bearing member B is Figure 2 The bearing member B is shown in the form of a ball bearing, but the utility model is not limited thereto. The outer ring of the bearing member B is fixed relative to the inner wall of the receiving hole 110, so that there is no relative rotational movement around the axis XX between the two, and the inner ring of the bearing member B is fixed to the outer wall of the driving part 1221 by a fixing member, so that there is neither relative translational movement along the axis XX (that is, the driving part 1221 will not be disengaged from the bearing member B) nor relative rotational movement around the axis XX between the two. The fixing member may be in the form of a circlip, although not shown in the figure.

[0043] It should be noted that, although the first receiving hole 111 of the base member 110 is depicted in the figure as a circular hole with a circular cross-section perpendicular to the axis XX, the utility model is not limited to this. By providing a special-shaped part or an adjustment part fixed relative to the outer ring on the outside of the outer ring of the bearing member B, the bearing member B can be adapted to the first receiving hole 111 with a different cross-sectional shape.

[0044] In addition, if Fig. 6A and Figure 6B As shown in , the first receiving hole 111 is in the form of a stepped hole, the diameter of the upper section of which is smaller than the diameter of the lower section, thereby allowing the bearing member B to be assembled into the first receiving hole 111 from the bottom and preventing the bearing member B from being disengaged from the upper part of the first receiving hole 111.

[0045] like Figure 2 , Fig. 6A and Figure 6B As shown in FIG. , at the lower end surface of the bearing member B ( Fig. 6A and Figure 6B A spacer is provided between the lower side of the second end 122 of the torque transmission member 120 and the outer side of the second end 122 of the torque transmission member 120. The spacer S may be in the form of a retaining ring, and its function is to separate the outer side of the second end 122 of the torque transmission member 120 from the lower side of the base member 110 by a certain distance δ, so as to prevent interference between the two when the torque transmission member 120 rotates. The value of δ can be selected by a skilled worker according to actual needs.

[0046] Figure 5A and Figure 5B They are shown respectively Figure 1 2 is a bottom perspective view and a top perspective view of a locking member 130 used in the adapter assembly 100 shown in FIG. The locking member 130 has a first locking end 131 and a second locking end 132 opposite thereto.

[0047] The first locking end 131 is provided with a locking hole 1311, which is configured to receive the shaft end (free end) 211 of the rotor shaft 210 of the rotor assembly 200 and limit the rotation of the shaft end 211 around the (rotation) axis XX of the rotor shaft 210. Figure 1 In the assembled state shown in FIG. 1 , the first locking end 131 of the locking member 131 is located between the first end 121 and the second end 122 of the torque transmission member 120. Figure 1 shown.

[0048] The second locking end 132 is provided with a limiting portion, which is used to cooperate with a limiting member (described in detail below) to only allow the locking member 130 to move along the axis XX and not to rotate relative to the base member 110. Specifically, the locking member 130 cannot rotate relative to the base member 101 in a plane perpendicular to the axis XX due to the cooperation with the limiting member.

[0049] although Figure 1 , Figure 5A and Figure 5B The second locking end 132 has a greater thickness (dimension along the axis XX) and a greater width (dimension along the axis XX) than the first locking end 131. Figure 1 The dimensions shown in the figure are perpendicular to the paper surface), but this specific dimension setting is only for the purpose of facilitating the positioning and guiding function, and the present invention is not limited thereto. Figure 5A and Figure 5B The thickness of the locking member 130 is set to be stepped at the second locking end 132, but it can also be set to be uniform in thickness, or the thickness gradually increases from the first locking end 131 to the second locking end 132. Under the premise of being able to achieve the above functions (purposes), other configuration structures that can be conceived by those skilled in the art are also feasible.

[0050] The adapter assembly 100 further includes a stopper 140. Figure 2 As shown in , the stopper 140 is two hollow bolts with enlarged heads. The two hollow bolts are used to pass through the stopper portion of the second locking end 132 of the locking member 130 from below, and then screwed to the second receiving hole 112 with internal threads of the base member 110. Figure 5A and Figure 5BIn the embodiment of the present invention, the stopper is shown to be in the form of two stopper through holes 1321, the central axes of which are parallel to the central axis of the locking hole 1311 of the first locking end 131 of the locking member 130. A sheath 150 (preferably a graphite sheath) is sleeved on each of the stoppers 140, and the sheath 150 is configured to separate the outer wall of the stopper 140 from the inner wall of the stopper through hole 1321 of the locking member 130, so as to facilitate the axial translation of the locking member 130 along the stopper 140 (i.e., along the axis XX). The diameter of the sheath 150 is smaller than the diameter of the enlarged head of the stopper 140, so as to prevent the sheath 150 from falling off the stopper 140 due to gravity.

[0051] Preferably, the sleeve 150 is clearance-fitted with the locking member 130 and / or the stopper 140. The stopper 140 is configured to limit the rotation of the locking member 130 relative to the base member 110 in a plane perpendicular to the axis XX, and can ensure the engagement of the first locking end 131 of the locking member 130 with the shaft end 211 of the rotor shaft 210. The enlarged head of the stopper 140 can prevent the locking member 130 from falling off therefrom due to gravity. In other words, the diameter of the enlarged head of the hollow bolt is greater than the diameter of the stopper through hole 1321 of the locking member 130.

[0052] Figure 6 yes Figure 1 A top view of the structure shown in Fig. 6A and Figure 6B They are respectively Figure 6 Cross-sectional views obtained along lines AA and BB in FIG.

[0053] Although the limiting member is described as two hollow bolts in the figure, it can be in the form of various structures. For example, the limiting member can be in the form of at least one limiting column, whose cross section perpendicular to the axis XX can be non-circular, and the limiting column can be directly fixed to the installation side of the base member 110 (for example, by welding). Figure 1 ), the stop column may be provided with a flange, and may be provided with an external thread at one end away from the base member 110 to prevent the locking member 130 from falling off by being screwed with an auxiliary nut. Alternatively, one end of the principle base member 110 of the stop column may be provided with a cap that is detachably fixed relative to it. The flange and the cap may be configured to prevent the locking member assembled on the stop column from falling off therefrom.

[0054] In addition, despite Figure 6 As shown in FIG. 1 , the second receiving hole 112 of the base member 110 is depicted with its central axes X1-X1 and X2-X2 in a plane perpendicular to the edge of the base member 110, but it can be arranged at a position at an angle other than 90° to the edge of the base member 110 (e.g. Figure 6 (shown as virtual image 112' in ).

[0055] Of course, the structural changes of the above-mentioned limiting member must correspond to / match the changes of the limiting portion of the second locking end 132 of the locking member 130, so as to achieve the functions of limiting and (axial) guiding.

[0056] The following describes the assembly method of the adapter assembly 100 according to the present invention by taking the structure shown in the figure as an example.

[0057] First, the bearing member B is placed in the first receiving hole 111 of the base member 110 from below, and the spacer S is sleeved on the driving portion 1221 of the second end 122 of the torque transmission member 120.

[0058] Subsequently, the driving part 1221 is placed in the inner ring of the bearing member B, and a retaining spring is inserted between the inner ring of the bearing member B and the outer wall of the driving part 1221, thereby fixing the two relative to each other;

[0059] Then, the sheath 150 is sleeved on the limiting member 140 , and the limiting through hole 1321 of the second locking end 132 of the locking member 130 is sleeved on the outer periphery of the sheath 150 ;

[0060] Then, the stopper 140 is screwed to the second receiving hole 112 / 112 ′ of the base member 110 , so that the first locking end 131 of the locking member 130 is disposed between the first end 121 and the second end 122 of the torque transmission member 120 .

[0061] Thus, the assembly of the adapter assembly 100 according to the present invention is completed. At this point, the adapter assembly 100 can be transported and assembled as a unit assembly.

[0062] The use process of the adapter assembly 100 according to the present invention is described as follows.

[0063] First, the operator puts the nut on the rotor shaft that has been pre-assembled with the impeller and tightens it by hand;

[0064] Move the adapter assembly 100 fixed to the existing mobile bracket to the top of the rotor shaft, and make the central axis of the first receiving hole 111 of the base member 110 collinear with the rotation axis of the rotor shaft;

[0065] The adapter assembly 100 is lowered to allow the engagement portion 1210 of the first end 121 of the torque transmission member 120 to engage with the preassembled nut. During this engagement process, the locking hole of the first locking end 131 of the locking member 130 is engaged / locked with the shaft end 211 of the rotor shaft 210 .

[0066] Thereby, the assembly of the adapter assembly 100 and the rotor shaft 210 is completed.

[0067] After the assembly process is completed, the engagement port P of the driving part 1221 can be engaged by using a tool such as a universal tightening gun to apply torque thereto, so that the driving part 1221 can rotate around the axis XX, thereby causing the first end 121 of the torque transmission member 120 to rotate. At this time, due to the engagement of the locking member 131 with the rotor shaft 210, the latter is locked so that it cannot rotate around the axis XX. Therefore, the rotation of the first end 121 of the torque transmission member 120 drives the nut to rotate around the axis XX, thereby further tightening it to the rotor shaft, thereby achieving the desired positioning of the impeller in the rotor assembly relative to the rotor shaft.

[0068] It should be noted that the description of the above assembly process and the use process is only illustrative, and the order of the various steps can be changed when applicable.

[0069] Although several embodiments of the present invention have been described with reference to the accompanying drawings, as will be appreciated by those skilled in the art, various modifications may be made to the above embodiments without departing from the scope defined by the appended claims. The above embodiments are provided only as examples to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Features or elements described in one embodiment may be incorporated into another embodiment for implementation unless they conflict with existing features or elements in another embodiment.

Claims

1. An adapter assembly for fastening a fastener to a rotating body, the rotating body being rotatable about a rotation axis, characterized in that: The adapter component comprises: a base member provided with a first receiving hole, the central axis of the first receiving hole being configured to be co-linear with the rotation axis in use; A locking member, the locking member being configured to: for engaging the free end of the rotating body and restraining the rotating body from rotating about the rotation axis; and capable of moving toward and away from the base member along the rotational axis but unable to rotate relative to the base member; A torque transmission member, the torque transmission member having: A first end configured to engage the fastener pre-sleeved on the rotating body; and The second end is opposite to the first end, and the second end is configured to be disposed in the first receiving hole and rotate around the central axis, thereby causing the first end to synchronously drive the fastener to rotate around the central axis to be fastened to the rotating body.

2. The adapter assembly according to claim 1, characterized in that: The first end is provided with an engagement portion in the form of a hole or a recess for engaging the fastener; and The second end is provided with a driving portion, and the driving portion is configured to be disposed in the first receiving hole to receive a driving force from the outside.

3. The adapter assembly according to claim 2, characterized in that: The driving portion is in the form of a sleeve, and a central axis of the sleeve is colinear with a central axis of the first receiving hole.

4. The adapter assembly according to claim 3, characterized in that: The torque transmission member is in the form of a hook-shaped member, and the driving portion extends from a side of the second end facing away from the first end and away from the first end.

5. The adapter assembly according to claim 4, characterized in that: The adapter assembly further comprises a bearing member, wherein the bearing member comprises: an inner race configured to rotate synchronously with the driving portion of the second end of the torque transmitting member; and An outer ring is configured to be fixed in the first receiving hole.

6. The adapter assembly according to claim 5, characterized in that: A fixing member is provided between the inner ring of the bearing member and the driving portion of the torque transmission member to achieve synchronous rotation therebetween; and A spacer is provided between the lower end surface of the bearing component and the outer side surface of the second end of the torque transmission component to space the lower side surface of the base component and the outer side surface of the second end of the torque transmission component by a certain distance.

7. The adapter assembly according to claim 6, characterized in that: The fixing element is in the form of a retaining spring, and / or the spacer element is in the form of a retaining ring.

8. The adapter assembly according to claim 6, characterized in that: The adapter assembly includes a limit member, which is fixed relative to the base member in a detachable or non-detachable manner, and the limit member is configured to cooperate with the locking member to enable the locking member to move toward and away from the base member along the central axis, but prevent the locking member from rotating relative to the base member in a plane perpendicular to the central axis.

9. The adapter assembly according to claim 8, characterized in that: The limiting member is fixedly connected to the lower side of the base member; One end of the limiting member away from the base member can engage with a blocking member to prevent the locking member from falling off the limiting member.

10. The adapter assembly according to claim 8, characterized in that: The limiting member is screwed to the second receiving hole of the base member, and the central axis of the second receiving hole is parallel to the central axis of the first receiving hole; A blocking portion is provided at one end of the limiting member away from the base member to prevent the locking member from falling off the limiting member, wherein the blocking portion is integrally formed with the limiting member or is separated from the limiting member.

11. The adapter assembly according to claim 8, characterized in that: The locking member is provided with: a first locking end configured to receive the free end of the rotating body and disposed between the first end and the second end of the torque transmitting member; and The second locking end is configured to be sleeved on the limiting member so as to be able to move along the limiting member toward and away from the base member but cannot rotate around the limiting member.

12. The adapter assembly according to claim 11, characterized in that: A sheath is provided between the second locking end of the locking member and the limiting member to facilitate the movement of the second locking end along the limiting member.

13. The adapter assembly according to claim 12, characterized in that: There is a clearance fit between the sheath and the second locking end and / or between the sheath and the limiting member; and / or The sheath is a graphite sheath.

14. The adapter assembly according to any one of claims 1 to 13, characterized in that: The base member is provided with a mating portion, the mating portion being configured to cooperate with the mobile bracket so that the mobile bracket can move the adapter assembly into place; and / or The adapter assembly is in the form of a unitary assembly that can be transported and / or used in one piece.

15. The adapter assembly according to claim 14, characterized in that: The rotating body is a rotor shaft in a rotor assembly used in an air compressor, and The fastener is an impeller nut used to properly position an impeller in the rotor assembly relative to the rotor shaft.

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