Sleeve device, in particular for a decoupling device in an electric drive train, and methods for its assembly and disassembly

Abstract

The invention relates to a sleeve device (100) and a method for its assembly and disassembly, particularly for a decoupling device of an electric drive train, comprising a sleeve carrier (101) mounted on a housing (103) and a shaft section (102) fixed to the housing in a rotationally and axially fixed manner, wherein the shaft section (102) extends into the sleeve carrier (101) and an axial positive locking device (109) is provided between the sleeve carrier (101) and the shaft section (102). To enable assembly and disassembly in a radially confined space within the installation space of the shaft section (102), at least one axial service bore (117, 118) for actuating an axial positive locking device (109) is provided in the shaft section (102) radially within the axial positive locking device (109).

Description

[0001] The invention relates to a sleeve device and a method for its assembly and disassembly, in particular for a decoupling device of an electric drive train with a sleeve carrier mounted on a housing and a shaft section fixed in a rotationally fixed and axial manner relative to the housing, wherein the shaft section extends into the sleeve carrier and an axial positive locking device is provided between the sleeve carrier and the shaft section.

[0002] In this context, sleeve devices serve to engage and disengage gear elements by axially displacing a sleeve carrier using an actuator or similar device, thereby connecting or disconnecting one gear element from another. For example, the proposed sleeve device can be used to engage and disengage an electric motor from other gear elements, such as drive wheels in an electric or hybrid powertrain. Due to manufacturing requirements, a sleeve carrier is pre-installed in a housing, such as a gearbox housing. Subsequently, a shaft section is connected to the sleeve carrier in a rotationally fixed manner.To provide axial locking of the two components – sleeve carrier and shaft section – to one another, it is known to connect the components by means of a press fit, to attach a retaining ring laterally, i.e., from the radial outside, between the components, or to secure them axially by means of an axially preloaded thread between the components. Such measures require access from a radial installation space during assembly or disassembly. Reference is made, for example, to DE 70 46 802 U, DE 10 2022 101 521 A1, and DE 296 20 375 U1.

[0003] The object of the invention is the further development of such a sleeve device as well as its assembly and disassembly. In particular, the object of the invention is to propose a sleeve device and a method for its assembly and disassembly which enable axial securing of the components to one another without access from a radial installation space.

[0004] The problem is solved by claims 1, 8, and 9. The dependent claims describe advantageous embodiments of the subject matter of claim 1.

[0005] The proposed sleeve device serves, in general terms, to connect and disconnect two rotating shaft sections. In particular, the proposed sleeve device is intended for a decoupling device of an electric drive train, in which, for example, the electric machine is decoupled from the rest of the drive train by means of the decoupling device, for example by friction or positive locking, by connecting and disconnecting two shaft sections by means of an axial displacement of the sleeve carrier, for example by an actuator.

[0006] During assembly of the drive train, the sleeve carrier is inserted into a housing and then secured, for example, by being mounted so that it can rotate relative to the housing. A shaft section is coaxially, rotationally, and axially fixed to the sleeve carrier. For example, a rotationally fixed connection between the sleeve carrier and the shaft section can be achieved by means of internal teeth on the sleeve carrier and external teeth on the shaft section. The shaft section can also have an axial projection extending into the sleeve carrier. An axial positive locking mechanism is provided between the sleeve carrier and the shaft section (e.g., the projection) to axially secure both the sleeve carrier and the shaft section. This mechanism is activated after assembly and deactivated during disassembly.

[0007] To enable axial locking of the sleeve carrier and shaft section against each other in confined radial installation spaces without requiring access from a radial space outside the sleeve assembly, at least one axial service bore is provided in the shaft section, particularly in its axial extension, radially within the positive locking mechanism. This allows radial access to the positive locking mechanism, for example, by means of a tool inserted through the service bore, enabling activation or deactivation. Depending on the specific design of the positive locking mechanism, the tool inserted into the service bore can perform, for example, an axial thrust movement, a radial movement, a rotary movement, a circumferential movement in one direction, or counter-circular movements, and / or similar actions.

[0008] According to the invention, in an advantageous embodiment of the sleeve device, the sleeve carrier and the shaft section, such as the extension in the assembly position, can have radially superimposed circumferential grooves into which the positive locking device extends under preload, and which can be radially displaced from one of the circumferential grooves by means of a tool engaging in the at least one service bore. The positive locking device can have a round or square cross-section so that, in the assembled state, its axial end faces can at least partially engage radially in both circumferential grooves over their circumference, thereby forming an axial positive lock between the sleeve carrier and the shaft section.A tool inserted axially into the service bore for disassembly purposes ensures that the positive locking mechanism retracts from one of the circumferential grooves, thus releasing the axial positive locking mechanism in order to separate the components axially from each other.

[0009] For example, the positive locking mechanism can be formed from at least two partial springs extending over partial circumferences, which have radially inward-facing hooks at their circumferential ends. Radially extending through-holes are provided in the shaft section, into which the hooks preferably engage with circumferential play. In the circumferential direction between the hooks, the partial springs have a manipulation area accessible via the service bore. In the assembled state, portions of the partial springs radially overlap the circumferential grooves of the sleeve carrier. For example, an eyelet aligned with a service bore is formed in the circumferential direction between the hooks, which can be displaced radially inward by means of a tool, so that the portions of the partial springs overlapping the circumferential grooves shear out of them and the axial positive locking between the sleeve carrier and the shaft section is released.

[0010] To protect the partial springs applied to the shaft section from loss before assembly, at least two partial springs are secured in the assembly position before the shaft section is mounted. This transport securing can be achieved, for example, by reversibly bonding the partial springs to each other or to the shaft section, or by a coating made of plastic or similar material.

[0011] For example, the positive locking mechanism can be designed as a spring ring open at one end. In an advantageous embodiment, the spring ring can be angled radially inwards at its circumferential ends, for example, by having radially inwardly folded tabs. The tabs are arranged in the circumferential region of the service bore. The spring ring is designed such that, in the assembled state, portions of the spring ring engage in the circumferential grooves of the sleeve carrier and the shaft section. To release the axial positive locking mechanism, the tabs are subjected to circumferential force against each other using a tool that engages axially in the service bore, thus releasing the positive locking mechanism.

[0012] In a further advantageous embodiment of an open spring ring, a pressure pin can be arranged in at least one opening radially connected to the service bore. This pressure pin can be displaced radially outwards against the preload of the spring ring by means of a tool. Here, the spring ring can be received with slight preload exclusively in the circumferential groove of the shaft section. The pressure pin can be displaced radially outwards by means of a tool, so that it moves at least a circumferential portion of the spring ring into the circumferential groove of the sleeve carrier, thereby creating an axial positive fit. To permanently establish this positive fit in the assembled state, an internal thread can be formed in the service bore, into which a pressure screw is inserted, the screw bearing radially against the pressure pin by means of an end chamfer.Turning the pressure screw moves the pressure pin radially outwards, creating a positive fit. Turning the pressure screw outwards releases the axial positive fit.

[0013] The problem underlying the invention is further solved by the method for assembling the proposed sleeve device. For this purpose, at the start of the assembly process, the sleeve carrier, which contains a circumferential groove radially inside, is pre-installed in a housing such as a gearbox housing. Preferably, the positive locking device, for example an open spring ring, is inserted into the circumferential groove of the shaft section. Alternatively, the positive locking device can also be inserted into the circumferential groove of the sleeve carrier. The shaft section is inserted axially into the sleeve carrier, for example by means of an axial extension. Depending on the design of the positive locking device, it may be pre-tensioned onto a single circumferential groove by means of a tool inserted into the service bore. The shaft section is then inserted axially into the sleeve carrier, forming a rotary connection.After axial alignment of the circumferential grooves, the preload of the positive locking device is released using the tool such that it at least partially overlaps both circumferential grooves radially with a remaining preload. The proposed method for disassembling the proposed sleeve device is essentially the reverse of the assembly process, by axially inserting a tool into the service bore. Under radial pressure, this tool releases the positive locking device from one of the circumferential grooves, and subsequently, the axial extension of the shaft section is displaced axially out of the sleeve carrier in the insertion direction of the tool.

[0014] The invention is described in the following: Fig. The exemplary embodiments shown in 1 to 11 are explained in more detail. These show: Fig. 1 a longitudinal section through a sleeve device along its longitudinal axis, Fig. 2 a cross-section of the sleeve device of the Fig. 1, Fig. 3 a cutaway 3D view of the sleeve carrier of the Fig. 1 and Fig. 2, Fig. 4 a 3D view of the wave section of the Fig. 1 and Fig. 2, Fig. 5 a 3D view of one of the partial springs of the positive locking mechanism of the Fig. 1 and Fig. 2, Fig. 6 the part of the sleeve device arranged above the longitudinal axis of the Fig. 1 and Fig. 2 during assembly in section, Fig. 7 one of the sleeve devices of the Fig. 1 similar socket device with a modified positive locking mechanism in longitudinal section, Fig. 8 the positive locking mechanism of the sleeve device of the Fig. 7 in view, Fig. 9 one of the sleeve devices of the Fig. 1 and Fig. 7 similar socket devices with a modified positive locking mechanism in longitudinal section, Fig. 10 the positive locking mechanism of the Fig. 7 in view and Fig. 11 a section detail of the sleeve device of the Fig. 9.

[0015] The Fig. Figure 1 shows the sleeve device 100 arranged around the longitudinal axis L in longitudinal section, in which Fig. 2 in conjunction with Fig. 1 in cross-section. The sleeve carrier 101 is rotatably mounted in the housing 103 about the longitudinal axis L and is supported on it by means of the bearing 104. The shaft section 102 is radially enlarged by the circumferential perforation 105 and forms the axial projection 106, which extends axially into the sleeve carrier 101.

[0016] The sleeve carrier 101 and the shaft section 102 are connected to each other in a rotationally fixed manner. For this purpose, the sleeve carrier 101 has internal teeth 107 and the extension 106 of the shaft section 102 has external teeth 108, which together form a toothed connection. The external teeth 119 serve to connect the sleeve carrier to functional elements of a decoupling device.

[0017] The sleeve carrier 101 and the shaft section 102 are axially secured to one another by means of the positive locking device 109. For this purpose, the sleeve carrier 101 and the axial projection 106 of the shaft section 102 have axially superimposed circumferential grooves 110, 111, into which the positive locking device 109 engages radially overlapping in the illustrated assembled state, thus forming an axial positive lock between the sleeve carrier 101 and the shaft section 102.

[0018] In the illustrated embodiment, the positive locking device 109 is formed from two partial springs 112 arranged around the circumference, which are clamped to the shaft section by means of end hooks 113. For this purpose, the shaft section 102 has openings 114 into which the hooks 113 engage. The partial springs 112 also have radially inwardly widened eyelets 115 between the hooks 113, which engage in further radial openings 116 of the axial projection 106.

[0019] In the assembled state, the partial springs 112 overlap both circumferential grooves 110, 111. To allow the shaft section 102 to be inserted into the sleeve carrier 101 during assembly and disassembly of the sleeve device 100, and to separate it during disassembly, service bores 117, 118 are provided in the axial projection 106. These bores extend radially within the positive locking device 109 in an axial direction from the end face 120 of the axial projection 106 to the through-holes 116. These service bores 117, 118 allow access to the positive locking device 109 without requiring radial installation space, thus minimizing the radial installation space of the sleeve device itself and the radial access space required during assembly and disassembly.

[0020] In the illustrated embodiment, the partial springs 112 are displaced from the circumferential groove 110 of the sleeve carrier against their preload by displacing the eyelets 115 radially inwards using a tool inserted into the service bores 117, 118. This limits the radial installation space of the partial springs 112 to the circumferential groove 111 of the shaft section 102, and the sleeve carrier 101 and the shaft section 102 are axially displaceable relative to each other.

[0021] The Fig. Figure 3 shows the sleeve carrier 101 of the sleeve device 100 of the Fig. Figure 1 shows a cutaway 3D view. The internal toothing 107 engages with the shaft section 102, and the circumferential groove 110 receives the positive locking device 109 when the sleeve device 100 is assembled. The external toothing 119 provides a rotationally fixed connection to a switching element of a decoupling device, for example, a shaft section that can be connected to and disconnected from the shaft section 102.

[0022] The Fig. Figure 4 shows the shaft section 102 of the sleeve device 1 of the Fig. Figure 1 in 3D view. The axial projection 106 has the external toothing 108 for meshing with the sleeve carrier 101 and the circumferential groove 111 for receiving the partial springs 112. The partial springs 112 are inserted into the circumferential groove 111 before assembly and are secured therein, for example, by a transport lock. The diametrically opposed through-holes 116 serve for the radial reception of the eyelets 115 of the partial springs 112. Axially in the flange area between the central opening 121 and the outer circumference of the projection 106, the service bores 117, 118 are indicated by dashed lines between the end face 120 and the through-holes 116. The holes 114 for receiving the hooks 113 of the partial springs 112 are arranged in a manner that is not visible and offset by 90° from the holes 116.

[0023] The Fig. Figure 5 shows one of the partial springs 112 of the sleeve device 100 of the Fig. Figure 1. The partial spring 112 extends essentially over a circumference of 180° and, together with a second, identical partial spring 112 to complete the circumference, forms the positive locking device 109. The partial spring 112 has inwardly directed hooks 113 at its ends, which are engaged in the through-holes 114 of the axial projection 106 of the shaft section 102. Centrally offset by 90° to the hooks 113 is the radially inwardly oriented eyelet 115, into which a tool inserted through the service bore 117 or 118 engages. By means of an eyelet 115 displaced radially inwardly, the axial positive locking of the partial spring 112 to the circumferential groove 110 of the sleeve carrier is released.

[0024] The Fig. Figure 6 shows the upper part of the sleeve device 100, arranged around the longitudinal axis L, in a sectional detail during assembly and disassembly. The tool 122 has the inwardly extending chamfer 123 and is inserted axially in the direction of arrow 124 into the service bore 117 and, correspondingly, into the diametrically opposite service bore 118 (not shown). By applying pressure to the eyelets 115 with the chamfer 123 of the tool 122, the eyelets 115 are displaced radially inwards and retract into the circumferential groove 111 of the shaft section 102. The axial projection 106 of the shaft section 102 can be inserted into the sleeve carrier 101 for mounting the sleeve device 100, and the positive locking device 109 can be axially secured after axial alignment of the circumferential grooves 110, 111 by pulling the tool 122 out of the service bores 117, 118 in the opposite direction to the arrow.The areas of the partial springs 112 around the eyelets 115 shift into the circumferential groove 110 and form an axial positive fit between sleeve carrier 101 and shaft section 102.

[0025] The disassembly of the sleeve assembly is essentially carried out in reverse order, by inserting the tool 122 in the direction of arrow 124 into the service bores 117, 118, using the chamfers 123 to retract the eyelets 115 radially inwards, thereby retracting the areas of the partial springs 112 that radially overlap the circumferential groove 110 and thus releasing the axial positive locking. Afterwards, the sleeve carrier 101 and the shaft section 102 can be separated.

[0026] The Fig. Figure 7 shows the opposite of the sleeve device 100 of the Fig. Figure 1 shows a modified positive locking device 209, similar to a sleeve device 200, in section. The positive locking device 209 is formed from a single, open spring ring 212, which, in the assembled state, radially overlaps both circumferential grooves 210, 211 of the sleeve carrier 201 and the shaft section. In the area of ​​the single service bore 217, the spring ring 212 has radially inwardly folded tabs 213 at its end ends. In order to displace the spring ring 212 from the circumferential groove 210 of the sleeve carrier 201 during assembly or disassembly and thus release the axial positive locking between the sleeve carrier 201 and the shaft section 202, the two tabs 213 are pressed together circumferentially against the preload of the spring ring 212 by means of a tool, for example, needle-nose pliers, inserted into the service bore 217. The Fig. Figure 8 shows the spring ring 212 of the sleeve device 200 of the Fig. 7 in view with the two brackets folded radially inwards 213.

[0027] The Fig. Figure 9 shows the difference between the sleeve devices 100, 200 of the Fig. 1 and Fig. Figure 7 shows a slightly modified section of the sleeve device 300. Compared to the sleeve devices 100 and 200, the sleeve device 300 has a modified positive locking device 309, which, in the assembled state of the sleeve device 300, engages in the radially superimposed circumferential grooves 310 and 311 of the sleeve carrier 301 and the shaft section 302. The positive locking device 309 includes the open spring ring 312, which, in the unassembled state, is pre-tensioned in the circumferential groove 311 of the shaft section 302 such that it is completely enclosed within it. In the illustrated embodiment, the axial projection 306 has two diametrically arranged radially spaced through-holes 325 located between the service bores 317 and 318 and the circumferential groove 311, each of which houses a pressure pin 326. The service bores 317, 318 have an internal thread into which a pressure screw 327 is screwed.The pressure screws 327 have a conical chamfer 328 at their ends, which, depending on its axial position, displaces the pressure pin 326 radially outwards. The pressure pin 326, in turn, displaces the circumferential area of ​​the spring ring it contacts radially outwards, so that it engages in the circumferential groove 310 of the sleeve carrier 301 and forms an axial positive fit with the sleeve carrier 301.

[0028] The Fig. Figure 10 shows the open spring ring 312 of the sleeve device 300 in view. The opening 329 of the spring ring 312 is rotated relative to the circumferential position of the pressure pins 326, for example by 10° to 90°.

[0029] The Fig.Figure 11 shows the sleeve device 300 in a sectional detail in the area of ​​the axial positive locking device 309. In the illustrated representation, the spring ring 312 forms an axial positive locking device between the sleeve carrier 301 and the shaft section 302 in the assembled state of the sleeve device 300, by partially engaging radially in both the circumferential groove 310 of the sleeve carrier 301 and the circumferential groove 311 of the shaft section 302. For this purpose, the pressure screws 327 - only one of the two pressure screws 327 is visible - are screwed into the service bores 317, 318 and act by means of their conical chamfer 328 on the pressure pins 326, which in turn displace the circumferential areas of the spring ring 312 in contact with them against its preload in the circumferential groove 311 into the circumferential groove 310, so that an axial positive locking is formed between the sleeve carrier 301 and the shaft section 302.

[0030] If this positive locking mechanism is to be separated again, the pressure screws are partially unscrewed so that the pressure pins 326 and thus the circumferential areas of the spring ring 312 acted upon by them, with the support of its preload, move out of the circumferential groove 310. Reference symbol list 100 coupling device 101 sleeve carriers 102 Wave section 103 cases 104 warehouses 105 holes 106 axial approach 107 Internal gearing 108 External gearing 109 axial positive locking 110 circumferential groove 111 Circumferential groove 112 partial springs 113 hooks 114 breakthrough 115 eyelet 116 breakthrough 117 Service bore 118 Service bore 119 External gearing 120 Front 121 central opening 122 tools 123 Slanted 124 Arrow 200 sleeve device 201 sleeve carriers 202 Wave section 209 axial positive locking 210 circumferential groove 211 Circumferential groove 212 Spring washer 213 irons 217 Service bore 300 sleeve device 301 sleeve carriers 302 Wave section 306 axial approach 309 axial positive locking 310 circumferential groove 311 Circumferential groove 312 Spring washer 317 Service bore 318 Service bore 325 breakthrough 326 Push pin 327 Pressure screw 328 conical slope 329 Opening L Longitudinal axis

Claims

[1] Sleeve device (100, 200, 300) in particular for a decoupling device of an electric drive train with a sleeve carrier (101, 201, 301) received on a housing (103) and a shaft section (102, 202, 302) fixed to it in a rotationally fixed and axially fixed manner, wherein the shaft section (102, 202, 302) extends axially into the sleeve carrier (101, 201, 301) and an axial positive locking device (109, 209, 309) is provided between the sleeve carrier (101, 201, 301) and the shaft section (102, 202, 302), characterized by , that in the shaft section (102, 202, 302) radially within the axial positive locking device (109, 209, 309) at least one axial service bore (117, 118, 217, 317, 318) is provided for actuating the positive locking device (109, 209, 309), characterized by, that the sleeve carrier (101, 201, 301) and the shaft section (102, 202, 302) have radially superimposed circumferential grooves (110, 111, 210, 211, 310, 311) in the assembled state, into which the axial positive locking device (109, 209, 309) extends under preload, wherein this device can be displaced radially from one of the circumferential grooves (110, 210, 310) by means of a tool (122) engaging in the at least one service bore (117, 118, 217, 317, 318). [2] Sleeve device (100) according to claim 1, characterized by , that the positive locking device (109) is formed from at least two partial springs (112) with end hooks (113) engaging in radial holes (114) of the shaft section (102) and in the circumferential direction between the hooks (113) an eyelet (115) aligned with a service bore (117, 118). [3] Sleeve device (100) according to claim 2, characterized by, that the at least two partial springs (112) are secured for transport before the shaft section (102) is mounted on the shaft section (102). [4] Sleeve device (200, 300) according to claim 1, characterized by , that the axial positive locking device (209, 309) is designed as a spring ring (212, 312) open on one side. [5] Sleeve device (200) according to claim 4, characterized by , that spring ends of the spring ring (212) are arranged at the service bore (217) and have radially inwardly angled brackets (213). [6] Sleeve device (300) according to claim 4, characterized by , that a pressure pin (326) is arranged in at least one radially connected bore (317, 318) and which can be displaced radially outwards against the preload of the spring ring (312) by means of a tool. [7] Sleeve device (300) according to claim 6, characterized by, that at least one service bore (317, 318) has an internal thread into which a pressure screw (327) is screwed, the pressure screw acting radially on the pressure pin (326) by means of an end chamfer (328). [8] Method for assembling a sleeve device (100, 200, 300), in particular for a decoupling device of an electric drive train, comprising a sleeve carrier (101, 201, 301) mounted on a housing (103) and a shaft section (102, 202, 302) fixed to the housing in a rotationally fixed and axially fixed manner, wherein the shaft section (102, 202, 302) extends axially into the sleeve carrier (101, 201, 301) and an axial positive locking device (109, 209, 309) is provided between the sleeve carrier (101, 201, 301) and the shaft section (102, 202, 302), wherein radially within the axial positive locking device (109, 209, 309) at least one axial service bore (117, 118, 217, 317, 318) is provided for actuating the positive locking device (109, 209, 309), characterized by, that the sleeve carrier (101, 201, 301) with a circumferential groove (110, 210, 310) is pre-installed in a housing (103), the axial positive locking device (109, 209, 309) is inserted into one of the circumferential grooves (110, 111, 210, 211, 310, 311), preferably into the circumferential groove (111, 211, 311) of the shaft section (102, 202, 302), and the shaft section (102, 202, 302) is pressed onto the circumferential groove (110, 111, 210, 211) by means of a tool (122) inserted into the service bore (117, 118, 217, 317, 318). 310, 311) pre-tensioned axial positive locking device (109, 209, 309) is inserted axially by forming a rotary connection with the sleeve carrier (101, 201, 301) until the circumferential grooves (110, 111, 210, 211, 310, 311) are axially aligned and then the pre-tension of the axial positive locking device (109, 209, 309) is released by means of the tool (122) in such a way that it at least partially engages both circumferential grooves (110, 111, 210, 211, 310,311) radially overlaps by means of a remaining preload. [9] Method for disassembling a sleeve device (100, 200, 300) according to any one of claims 1 to 7, characterized by , that a tool (122) is inserted axially into the service bore (117, 118, 217, 317, 318), which, under radial pressure, releases the axial positive locking device (109, 209, 309) from one of the circumferential grooves (110, 210, 310), whereby the shaft section (102, 202, 302) is then displaced axially out of the sleeve carrier (101, 201, 301) in the insertion direction of the tool (122).

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