High-precision positioning press-fitting device for intermediate shaft and gear assembly

Abstract

The utility model discloses an intermediate shaft and gear assembly high-precision positioning press-fitting device which comprises a base, the base is provided with a supporting face, and a first channel extending in the axial direction is formed in the middle of the base. The positioning ring is installed on the base and is coaxial with the first channel, and the positioning ring is arranged outside the gear in a sliding and sleeving mode during press fitting; the first positioning cone top is mounted in the first channel in a sliding manner and is coaxial with the positioning ring; the first spring is arranged in the first channel and is supported at the bottom of the first positioning cone top, so that the first positioning cone top can coaxially extend into a center hole in the lower end of the intermediate shaft after the pilot part of the intermediate shaft is inserted into the gear; the pressing rod is arranged above the base, and a second channel extending in the axial direction is formed in the pressing rod; the second positioning cone top is installed in the second channel in a sliding mode, the second positioning cone top and the first positioning cone top (3) are coaxially arranged, and during press fitting, the cone part of the second positioning cone top coaxially stretches into the center hole in the upper end of the middle shaft. Through the scheme, the mounting quality of the intermediate shaft and the gear is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a middle axle, gear assembly high accuracy positioning press fitting device, concretely to a middle axle, gear assembly high accuracy positioning press fitting device. BACKGROUND

[0002] The middle axle, gear assembly is an important part in the new energy automobile drive motor device, belongs to a kind of automobile accessories, middle axle and gear are spline interference fit, and are connected by press fitting. Figure 3 As shown in Figure, since middle axle and gear are connected by press fitting by spline, high precision is required, in prior art, generally simple tooling is used to cooperate with press machine to press fit, that is, first gear is placed on simple tooling, then middle axle is placed on gear, and finally press fitting is carried out by press machine. In the above press fitting process, when spline of middle axle is pressed into spline groove of gear, coaxiality between gear and middle axle cannot be effectively guaranteed (mainly because middle axle is not positioned during press fitting process, and axial inclination is prone to occur), therefore, middle axle needs to be adjusted in position multiple times to guarantee gear big end face runout and V value after press fitting. Then, multiple manual alignment is required in the whole press fitting process of middle axle and gear, time is wasted, efficiency is low, press fitting quality cannot be guaranteed, and scrap rate is high. CONTENT OF UTILITY MODEL

[0003] The utility model aims at providing a middle axle, gear assembly high accuracy positioning press fitting device, to enable middle axle and gear to maintain high coaxiality during installation process, reduce adjustment times during middle axle and gear assembly process, and guarantee assembly quality of gear and middle axle.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A middle axle, gear assembly high accuracy positioning press fitting device, comprising

[0006] Base, the base has support surface with the end surface smooth contact of gear, first channel extending axially is arranged in the base;

[0007] Positioning ring, installation is positioned on base, and with the first channel coaxial, positioning ring is sleeved on the outside of gear during press fitting;

[0008] First positioning cone top, slidingly mounted in the first channel, and coaxial with the positioning ring;

[0009] First spring, set in first channel and supported on the bottom of first positioning cone top, so that first positioning cone top can be coaxially inserted into the lower end center hole of middle axle after the leading portion of middle axle is inserted into gear;

[0010] A pressing rod is arranged above the base, and an axially extending second channel is formed in the pressing rod;

[0011] A second positioning cone top is slidingly arranged in the second channel and coaxially arranged with the first positioning cone top, and the conical part of the second positioning cone top is coaxially inserted into the upper end center hole of the intermediate shaft during pressing.

[0012] Preferably, a second spring is arranged in the second channel and abuts against the second positioning cone top, so that the tip of the second positioning cone top is abutted against the intermediate shaft under pressure.

[0013] Preferably, a guide rod is arranged at the bottom of the first positioning cone top and slidingly extends out of the base.

[0014] Preferably, a stop washer is connected to the lower end of the guide rod.

[0015] Preferably, an inclined slope is arranged at the upper edge of the positioning ring.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] The coaxial first positioning cone top, second positioning cone top and positioning ring are arranged, so that the gear can be positioned by the positioning ring, and the two ends of the intermediate shaft can be positioned by the first positioning cone top and the second positioning cone top before pressing, thereby ensuring the coaxiality of the gear and the intermediate shaft before and during pressing, and the end jump and V value of the assembled gear and intermediate shaft can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the state diagram of the utility model before pressing the gear and the intermediate shaft;

[0019] Figure 2 is the state diagram of the utility model after pressing the gear and the intermediate shaft;

[0020] Figure 3 is Figure 1 the enlarged view of the utility model.

[0021] Fig. 1 is a base; Fig. 2 is a positioning ring; Fig. 3 is a first positioning cone top; Fig. 4 is a first spring; Fig. 5 is a pressing rod; Fig. 6 is a second positioning cone top; Fig. 7 is a second spring; Fig. 8 is a guide rod; and Fig. 9 is a stop washer. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0025] like Figures 1-3 The illustrated device for high-precision positioning and press-fitting an intermediate shaft and gear assembly comprises a base 1 with a horizontal support surface 12 on its upper surface. This support surface is parallel to the lower end surface of a horizontally positioned gear to ensure that the gear remains horizontal after being placed on the base. Furthermore, a first channel 11 is defined in the center of the base, extending axially (vertically) along the base to maintain parallelism with the axis of the gear placed thereon.

[0026] A locating ring 2 is also bolted to the base. The inner diameter of this locating ring is the same as the outer diameter of the gear to be assembled. That is, when the gear and the intermediate shaft are assembled, once the gear is placed on the base 1, the locating ring slides over the outside of the gear to position it. It should be noted that in this embodiment, the locating ring is coaxial with the first channel 11.

[0027] like Figure 1As shown, a first positioning cone 3 is also slidably fitted in the first channel. Specifically, the first positioning cone is coaxially arranged with the positioning ring 2, and the pointed part of the first positioning cone extends out of the first channel.

[0028] It should also be noted that a first spring 4 is also arranged in the first channel 11, and the first spring supports the bottom of the first positioning cone 3, so as to ensure that the extended part of the first positioning cone can extend into the internal spline of the gear placed on the base 1 when the first positioning cone is not pressed by external force. Moreover, the extended pointed part can first abut against the intermediate shaft after the leading part of the intermediate shaft is inserted into the gear, so as to coaxially constrain the lower end of the intermediate shaft.

[0029] Meanwhile, a pressing rod 5 is arranged above the base, and the pressing rod is subsequently connected with the telescopic rod of the press. A second channel 51 extending along the axial direction of the pressing rod is formed in the pressing rod, and the second channel is coaxially arranged with the first channel and the positioning ring. As shown, Figure 1 、 Figure 2 A second positioning cone is slidably fitted in the second channel, and the second positioning cone 6 is coaxially arranged with the lower positioning ring and the first positioning cone. It should be noted that the tapered part of the second positioning cone 6 extends out of the lower part of the pressing rod in the natural state, so as to ensure that the pointed part of the second positioning cone can first extend into the upper end of the intermediate shaft under pressure when the pressing rod is lowered, thereby coaxially constraining the upper end of the intermediate shaft.

[0030] It should be noted that when the upper and lower ends of the intermediate shaft are both coaxially constrained, the intermediate shaft can maintain the coaxial relationship with the gear before and during the pressing process, so that the assembly quality of the gear and the intermediate shaft is ensured, and the end jump value and V value of the assembled gear and intermediate shaft assembly can be guaranteed.

[0031] It should be noted that the following improvements are made on the basis of the above embodiment. Specifically, as shown, Figure 1 A second spring 7 is arranged in the second channel 51, and the second spring abuts against the second positioning cone 6, so that the second positioning cone can stably abut against the upper end of the intermediate shaft when the pressing rod is pressed, even if the intermediate shaft exerts an upward thrust on the second positioning cone.

[0032] It should also be noted that in order to further improve the stability of the first positioning cone during the pressing process, a guide rod 8 is coaxially connected to the bottom of the first positioning cone 3, and the guide rod is slidably fitted through the base. When the intermediate shaft is pressed to lower the first positioning cone, the guide rod exerts an axial guide constraint on the lowered first positioning cone.

[0033] It also needs to be explained that, in order to prevent the rebound of the first spring 4 causes the first positioning cone top and the guide rod from the base out, a block of retreat washer 9 is arranged on the end of the guide rod extending out of the base.

[0034] Finally, it also needs to be explained that, in order to facilitate the gear into the positioning ring, a lead-in ramp 21 is also provided on the inner circle of the positioning ring.

[0035] Working principle: when the gear and the intermediate shaft need to be pressed, first, the gear is placed on the base, and the gear is located in the positioning ring at the same time. Then, the leading part of the intermediate shaft is inserted into the inner spline of the gear, and the tip of the first positioning cone top is inserted into the lower end center hole of the intermediate shaft at this time, and is matched with the center hole, thereby guiding the intermediate shaft. After the above steps are completed, the operator supports the intermediate shaft, and then drives the presser to slightly descend, and the second positioning cone top in the presser descends at this time, so that the tip of the second positioning cone top is inserted into the upper end center hole of the intermediate shaft, and the second positioning cone top axially guides the upper end of the intermediate shaft. After the upper and lower ends of the intermediate shaft are axially guided, the presser can be driven to continuously press, and at this time, the problem of axial deflection of the intermediate shaft and the gear during pressing does not occur, and the pressing quality of the intermediate shaft and the gear assembly is guaranteed. It needs to be explained that, the machining center hole of the intermediate shaft is flexibly used to axially position the intermediate shaft, and the coaxiality of the intermediate shaft and the gear during pressing is guaranteed, and the final pressing quality of the gear and the intermediate shaft assembly is effectively guaranteed. It needs to be explained that, the pressing of the intermediate shaft and the gear by the present scheme does not need to be adjusted manually during pressing, which greatly improves the pressing efficiency and guarantees the pressing quality.

[0036] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A high-precision positioning and press-fitting device for an intermediate shaft and a gear assembly, characterized by: include A base (1), the base (1) having a support surface (12) in smooth contact with an end surface of the gear, and a first axially extending channel (11) formed in the middle of the base (1); A positioning ring (2) is mounted on the base (1) and is coaxial with the first channel (11). When press-fitted, the positioning ring (2) slides onto the outside of the gear; A first positioning cone top (3) is slidably mounted in the first channel (11) and is coaxial with the positioning ring (2); A first spring (4) is disposed in the first channel (11) and supported on the bottom of the first positioning cone (3), so that after the pilot portion of the intermediate shaft is inserted into the gear, the first positioning cone can coaxially extend into the lower center hole of the intermediate shaft; A pressure rod (5) is arranged above the base (1), and a second channel (51) extending axially is provided in the pressure rod (5); The second positioning cone top (6) is slidably mounted in the second channel (51) and is coaxially arranged with the first positioning cone top (3). When pressed, the cone portion of the second positioning cone top (6) coaxially extends into the center hole at the upper end of the intermediate shaft; A second spring (7) is provided in the second channel (51), and the second spring (7) presses against the second positioning cone top (6), so that the uppermost portion of the second positioning cone top (6) is pressed against the intermediate shaft; A guide rod (8) is further provided at the bottom of the first positioning cone top (3), and the guide rod (8) is slidably fitted and penetrates the base (1); The lower end of the guide rod (8) is connected to a stop washer (9).

2. A high-precision positioning and press-fitting device for an intermediate shaft and gear assembly as claimed in claim 1, characterized in that: An introduction slope (21) is provided on the upper edge of the positioning ring (2).

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