Hydraulic expansion clamp for machining electric drive input shaft of new energy automobile
By fitting a splined sleeve on the outer circle of the mandrel and using hydraulic tensioning for positioning, the problem of insufficient positioning of the micro-conical spline mandrel was solved, thus improving the machining accuracy of the electric drive input shaft for new energy vehicles.
Patent Information
- Application Number
- CN202423207455.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-24
AI Technical Summary
In the existing technology, the micro-tapered spline mandrel positioning method makes it difficult to achieve the design requirements for the precision of the electric drive input shaft of new energy vehicles during the grinding process, especially the runout requirements of the outer circles and inner splines at both ends.
A hydraulic expansion clamp is used. A spline sleeve is fitted on the outer circle of the mandrel and forms a tension fit with the spline inside the input shaft for positioning. The oil passage is connected to the hydraulic chamber, and the oil pressure is increased to cause the spline sleeve to expand radially and form a tight fit with the spline inside the input shaft.
The machining accuracy of the input shaft has been improved, overcoming the problem of insufficient positioning of the micro-tapered spline mandrel, and ensuring the dimensional and positional accuracy requirements of the electric drive input shaft.
Smart Images
Figure CN223589123U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of shaft piece machining fixture, specifically relates to a new energy automobile electric drive input shaft processing is with liquid expansion fixture. BACKGROUND
[0002] The electric drive system is the core power assembly of the new energy automobile, and the input shaft is an important part of the electric drive system, and the size precision requirement is high, and the processing difficulty is big. Figure 1 As shown in the figure, the cylindricality and coaxiality requirements of the two end outer circles A and B are very high, so the two end outer circles need to be precisely ground as the final finishing, but the inner spline has a higher runout requirement relative to the two end outer circles, and the inner spline processing and the two end outer circle grinding are two processing procedures respectively, so it is difficult to meet the product design requirements after processing.
[0003] The current processing scheme is usually to use a micro taper spline mandrel to penetrate into the inner spline, and the inner spline is used as a positioning reference to grind the two end outer circles and the end face. Since the micro taper spline mandrel and the inner spline are positioned by point contact, a gap is formed between them. During the grinding process, the grinding wheel feeding force is easy to cause deformation when acting on the two end outer circles, thereby causing the precision of the input shaft to be difficult to reach the product design requirements after processing. UTILITY MODEL CONTENTS
[0004] The utility model aims at: in view of the problem that the micro taper spline mandrel is penetrated into the input shaft inner spline, and the two end outer circles are ground by positioning, the utility model provides a new energy automobile electric drive input shaft processing is with liquid expansion fixture, the fixture is through adopting spline tooth sleeve hydraulic expansion, makes it with input shaft inner spline form expansion fit positioning, can overcome the deficiency of existing micro taper spline mandrel positioning, improves input shaft processing quality.
[0005] The utility model realizes by the following technical schemes:
[0006] The utility model provides a new energy automobile electric drive input shaft processing is with liquid expansion fixture, including the mandrel and spline tooth sleeve, the both ends of mandrel are provided with the tailstock hole, the spline tooth sleeve is set on the section outer circle of mandrel, the spline tooth sleeve and the outer circle of mandrel form the hydraulic cavity, the spline tooth sleeve is matched with input shaft inner spline, the oil channel is set up on the mandrel, the oil channel is communicated with the hydraulic cavity, the spline tooth sleeve can produce radial expansion deformation and form expansion fit with input shaft inner spline after the oil pressure of oil channel increases.
[0007] As a preferred scheme of the utility model, the mandrel has a reduced diameter section on the section outer circle where the spline tooth sleeve is set, and the reduced diameter section and the interior of the spline tooth sleeve form the hydraulic cavity.
[0008] As a preferred scheme of the utility model, the spline tooth sleeve is thin-walled structure, and both ends thereof are in sealing connection with the outer circle of the mandrel.
[0009] As a preferred scheme of the utility model, the inner walls of both ends of the spline tooth sleeve are sealed with the outer circle of the mandrel through sealing rings.
[0010] As a preferred scheme of the utility model, the inner walls of both ends of the spline tooth sleeve are sealed with the outer circle of the mandrel through welding.
[0011] As a preferred scheme of the utility model, a manual hydraulic expansion nut is arranged at one port of the oil channel, and the manual hydraulic expansion nut is used for adjusting the oil pressure in the oil channel.
[0012] As a preferred scheme of the utility model, the mandrel is provided with an annular protrusion on the outer circle close to one end, and the manual hydraulic expansion nut is arranged in the port on the outer circle of the annular protrusion.
[0013] As a preferred scheme of the utility model, a first positioning sleeve is sleeved on the mandrel, and a positioning plane is arranged at one end of the first positioning sleeve facing the spline tooth sleeve, and the positioning plane is used for positioning the end face of the input shaft.
[0014] As a preferred scheme of the utility model, a second positioning sleeve is sleeved on the mandrel, and a positioning conical surface is arranged at one end of the second positioning sleeve facing the spline tooth sleeve, and the positioning conical surface is used for positioning the inner hole of the other end of the input shaft, and the second positioning sleeve is arranged in a floating manner along the axial direction.
[0015] As a preferred scheme of the utility model, a spring and a locking nut are sequentially sleeved on the mandrel, the two ends of the spring abut between the second positioning sleeve and the locking nut, and the locking nut is in threaded cooperation with the mandrel.
[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0017] The utility model discloses a mandrel with a spline tooth sleeve, a hydraulic cavity is formed between the spline tooth sleeve and the outer circle of the mandrel, the spline tooth sleeve is matched with the inner spline of the input shaft, and the mandrel is provided with an oil channel, which is communicated with the hydraulic cavity. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical scheme in the example embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as limiting the scope, for the ordinary skilled in the art, under the premise of not paying creative labor, can also obtain other related drawings according to these drawings.In the drawings:
[0019] Figure 1 It is the schematic diagram of the electric drive input shaft of a product;
[0020] Figure 2 It is the sectional view of the hydraulic expansion clamp for processing the electric drive input shaft of the new energy vehicle in the utility model;
[0021] Figure 3 It is the schematic diagram of the spline tooth sleeve in the utility model Figure 2
[0022] Figure 4 It is the schematic diagram of the input shaft after being installed on the clamp.
[0023] Markings in the drawings and corresponding component names:
[0024] 1 - mandrel, 11 - annular protrusion, 2 - spline tooth sleeve, 3 - hydraulic cavity, 4 - oil way, 5 - manual hydraulic expansion nut, 6 - first positioning sleeve, 61 - positioning plane, 7 - second positioning sleeve, 71 - positioning conical surface, 8 - spring, 9 - locking nut, Z - input shaft. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the following will be further detailed to the utility model by combining with the embodiments and drawings, the illustrative embodiments of the utility model and its explanation are only used to explain the utility model, and should not be regarded as limiting the utility model.
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the application; the terms in the specification and claims of the application and the above drawing description "include" and "have" and any modification thereof, are intended to cover non-exclusive inclusion.
[0027] In the description of the embodiments of the application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.
[0028] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be 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 referring to a common embodiment, or an embodiment that is independent of all other embodiments. One of ordinary skill in the art will readily recognize from the disclosure herein, that embodiments of the present application can be combined with embodiments of the other applications.
[0029] In the description of the embodiments of the present application, the term“and / or” is merely used to describe associated objects, and can represent that there can be three types of relationships, for example, A and / or B can represent that there are A, A and B, and B. In addition, the character“ / ” in this paper generally represents that the front and rear associated objects are a“or” relationship.
[0030] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.
[0031] In the description of the embodiments of the present application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces), unless otherwise explicitly specified.
[0032] In the description of the embodiments of the present application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.
[0033] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0034] Please refer to Figures 1 to 4 The liquid expansion fixture for machining the electric drive input shaft of a new energy vehicle provided in the embodiments of the present application comprises a mandrel 1 and a spline tooth sleeve 2. The two ends of the mandrel 1 are provided with a center hole, and clamping is achieved through the center hole and the center of a machine tool. A spline tooth sleeve 2 is sleeved on a section of the outer circle of the mandrel 1. A hydraulic cavity 3 is formed between the spline tooth sleeve 2 and the outer circle of the mandrel 1. The spline tooth sleeve 2 is matched with the internal spline of the input shaft Z. An oil channel 4 is arranged on the mandrel 1. The oil channel 4 is communicated with the hydraulic cavity 3. The spline tooth sleeve 2 can produce radial expansion deformation after the oil pressure in the oil channel 4 is increased, and the expansion deformation is matched with the internal spline of the input shaft Z.
[0035] In the present application, the spline tooth sleeve 2 is sleeved on a section of the outer circle of the mandrel 1. A hydraulic cavity 3 is formed between the spline tooth sleeve 2 and the outer circle of the mandrel 1. The spline tooth sleeve 2 is matched with the internal spline of the input shaft Z. At the same time, an oil channel 4 is arranged on the mandrel 1. The oil channel 4 is communicated with the hydraulic cavity 3. When the internal spline of the input shaft Z is sleeved on the external spline of the spline tooth sleeve 2, the oil pressure in the oil channel 4 is increased, the spline tooth sleeve 2 produces radial expansion deformation, and the expansion deformation is matched with the internal spline of the input shaft Z to achieve expansion and positioning. The shortcomings of the existing micro-taper spline mandrel 1 positioning can be overcome, and the machining precision of the input shaft Z can be improved.
[0036] According to some embodiments of the present application, the mandrel 1 has a reduced diameter section on a section of the outer circle on which the spline tooth sleeve 2 is sleeved. The reduced diameter section and the interior of the spline tooth sleeve 2 form the hydraulic cavity 3. Since the spline tooth sleeve 2 is an external spline, the inner hole wall of the spline tooth sleeve 2 is matched with the outer circle of the mandrel 1. By arranging a reduced diameter section on the outer circle of the mandrel 1, the reduced diameter section is slightly smaller in diameter, and thus the hydraulic cavity 3 can be formed between the reduced diameter section and the inner hole wall of the spline tooth sleeve 2.
[0037] According to some embodiments of the present application, the spline tooth sleeve 2 is a thin-walled structure, and the two ends of the spline tooth sleeve 2 are sealingly connected with the outer circle of the mandrel 1. After the spline tooth sleeve 2 adopts a thin-walled structure and the two ends of the spline tooth sleeve 2 are sealingly connected with the outer circle of the mandrel 1, when the oil pressure in the hydraulic cavity 3 is increased, the spline tooth sleeve 2 will produce expansion deformation at a section opposite to the reduced diameter section, so as to be matched with the internal spline of the input shaft Z to achieve expansion and positioning.
[0038] According to some embodiments of the present application, the inner walls of the two ends of the spline tooth sleeve 2 are sealingly connected with the outer circle of the mandrel 1 through sealing rings. Since the spline tooth sleeve 2 is a consumable part, the sealing rings are used for sealing, which can facilitate replacement of the spline tooth sleeve 2 in the later period. Specifically, two sealing grooves can be formed on the outer circle of the mandrel 1, and the reduced diameter section is located between the two sealing grooves. After the spline tooth sleeve 2 is installed on the mandrel 1, the sealing rings in the sealing grooves will be extruded with the inner hole wall of the spline tooth sleeve 2 to form a sealing effect. It should be noted that the structure of the sealing rings is not shown in the figure.
[0039] According to some embodiments of the present application, the inner walls of the two ends of the spline sleeve 2 are sealed with the outer circle of the mandrel 1 by welding. Of course, the two ends of the spline sleeve 2 can also be sealed with the outer circle of the mandrel 1 by welding, which has high reliability and fixes the axial position of the spline sleeve 2, but the mandrel 1 may be deformed by welding and the spline sleeve 2 is not convenient to replace.
[0040] According to some embodiments of the present application, a manual hydraulic expansion nut 5 is arranged at one port of the oil channel 4, which is used to adjust the oil pressure in the oil channel 4. By arranging the manual hydraulic expansion nut 5, the oil is extruded after being screwed in, the pressure of the oil is increased, and the pressure of the oil is reduced after being unscrewed.
[0041] According to some embodiments of the present application, the mandrel 1 is provided with an annular protrusion 11 near one end of the outer circle, and the manual hydraulic expansion nut 5 is arranged in the port on the outer circle of the annular protrusion 11. Since the oil channel 4 in this embodiment includes an axial section and a radial section, the axial section is arranged along the central axis of the mandrel 1, one end of the axial section is communicated with the hydraulic cavity 3 through a communication hole, and the other end is blocked by a plug; the radial section is arranged on the annular protrusion 11, one end of which is communicated with the axial section, and the other end is provided with the manual hydraulic expansion nut 5.
[0042] According to some embodiments of the present application, the mandrel 1 is provided with a first positioning sleeve 6, and the first positioning sleeve 6 is provided with a positioning plane 61 at one end facing the spline sleeve 2, which is used to position one end surface of the input shaft Z. By arranging the first positioning sleeve 6, the positioning plane 61 can position the end surface of the input shaft Z when the input shaft Z is installed, so that the axial position of the input shaft Z relative to the mandrel 1 remains consistent after installation, thereby achieving axial positioning of the input shaft Z. In order to keep the axial position of the first positioning sleeve 6 unchanged, the first positioning sleeve 6 is fixedly connected to the annular protrusion 11 of the mandrel 1 by bolts.
[0043] When the inner walls of the two ends of the spline sleeve 2 and the outer circle of the mandrel 1 are sealed by a sealing ring, in order to avoid excessive change of the axial position of the spline sleeve 2, an axial limiting step that cooperates with each other can be arranged between the end of the spline sleeve 2 and the end of the inner hole of the first positioning sleeve 6, so as to limit the axial movement of the spline sleeve 2 within a certain range.
[0044] According to some embodiments of the present application, the mandrel 1 is sleeved with a second positioning sleeve 7, the second positioning sleeve 7 is provided with a positioning taper surface 71 at one end facing the spline sleeve 2, the positioning taper surface 71 is used for positioning the inner hole of the other end of the input shaft Z, and the second positioning sleeve 7 is provided in an axially floating manner. By providing the positioning taper surface 71 on the second positioning sleeve 7, and the second positioning sleeve 7 is provided in an axially floating manner, the circumferential floating pre-centering effect can be achieved for the inner hole of the other end of the input shaft Z, so as to further improve the installation and positioning accuracy of the input shaft Z on the mandrel 1, and further improve the machining accuracy.
[0045] According to some embodiments of the present application, the mandrel 1 is sleeved with a spring 8 and a locking nut 9 in sequence, the two ends of the spring 8 abut between the second positioning sleeve 7 and the locking nut 9, and the locking nut 9 is in threaded cooperation with the mandrel 1. When the second positioning sleeve 7 is in contact with the input shaft Z, the locking nut 9 is rotated to move along the mandrel 1, so as to change the pre-tightening force of the spring 8, and the second positioning sleeve 7 also has an axial floating effect.
[0046] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A liquid expansion clamp for machining an electric drive input shaft of a new energy vehicle, characterized in that, The utility model provides a kind of hydraulic expansion sleeve, including mandrel and spline sleeve, the both ends of the mandrel are provided with centre, the outer circle of the mandrel is provided with spline sleeve, hydraulic cavity is formed between the spline sleeve and the outer circle of the mandrel, the spline sleeve is matched with inner spline of input shaft, oil channel is provided on the mandrel, the oil channel is communicated with the hydraulic cavity, the spline sleeve can produce radial swelling deformation and form tight fit with inner spline of input shaft after the oil pressure in the oil channel increases.
2. The hydraulic expansion fixture for machining the electric drive input shaft of new energy vehicles according to claim 1, characterized in that, The mandrel has a reduced diameter section on the outer circle of the section where the spline sleeve is sleeved, and the reduced diameter section forms the hydraulic cavity with the interior of the spline sleeve.
3. The hydraulic expansion fixture for machining the electric drive input shaft of new energy vehicles according to claim 1, characterized in that, The spline sleeve is of thin-walled structure, and its both ends are sealingly connected with the outer circle of the mandrel.
4. The hydraulic expansion fixture for machining the electric drive input shaft of new energy vehicles according to claim 3, characterized in that, The inner walls of the both ends of the spline sleeve are sealingly connected with the outer circle of the mandrel by sealing rings.
5. The liquid expansion fixture for machining the electric drive input shaft of new energy vehicles according to claim 3, characterized in that, The inner walls of the both ends of the spline sleeve are sealingly connected with the outer circle of the mandrel by welding.
6. The hydraulic expansion fixture for machining electric drive input shaft of new energy vehicle according to claim 1, characterized in that, A manually operated hydraulic expansion nut is arranged at one port of the oil channel, and is used to adjust the oil pressure in the oil channel.
7. The hydraulic expansion fixture for machining the electric drive input shaft of new energy vehicles according to claim 6, characterized in that, The mandrel is provided with an annular protrusion on the outer circle close to one end, and the manually operated hydraulic expansion nut is arranged in the port on the outer circle of the annular protrusion.
8. The hydraulic expansion fixture for machining the electric drive input shaft of new energy vehicles according to claim 1, characterized in that, The mandrel is sleeved with a first positioning sleeve, and the first positioning sleeve is provided with a positioning flat surface at one end facing the spline sleeve, which is used to position one end surface of the input shaft.
9. The liquid expansion fixture for machining the electric drive input shaft of new energy vehicles according to claim 1, characterized in that, The mandrel is sleeved with a second positioning sleeve, and the second positioning sleeve is provided with a positioning conical surface at one end facing the spline sleeve, which is used to position the inner hole of the other end of the input shaft, and the second positioning sleeve is axially floatably arranged.
10. The hydraulic expansion fixture for machining the electric drive input shaft of new energy vehicles according to claim 9, characterized in that, The mandrel is sequentially sleeved with a spring and a locking nut, the both ends of the spring abut between the second positioning sleeve and the locking nut, and the locking nut is threadedly connected with the mandrel.