Press-fitting tool and press-fitting method for deep-cavity oil injection ring assembly of oil-cooled motor shell

Abstract

The invention discloses an oil cooling motor shell deep cavity oil injection ring assembly press-fitting tool and method, the press-fitting tool comprises a press-fitting frame and a press-fitting disc, the press-fitting disc comprises an inner pressing ring and an outer pressing ring, an upper pressing plate is formed on the upper side of the inner pressing ring, a lower pressing plate is formed on the upper side of the outer pressing ring, and the inner pressing ring is fixedly connected with the press-fitting frame; the outer pressing ring sleeve is fixedly connected with the inner pressing ring; the press-fitting frame is provided with a press-fitting rod. The press-fitting method comprises the following steps: 1) machining the press-fitting tool; the method comprises the steps of (1) assembling a press-fitting tool, (2) assembling an oil injection ring assembly, (3) fastening an oil injection ring and a press-fitting disc together, (4) moving the press-fitting tool and the oil injection ring to the position above a motor shell, (5) installing the press-fitting frame, the press-fitting disc and the oil injection ring into the motor shell, and (6) completing assembling of the oil injection ring assembly.The oil injection ring assembly can be rapidly, accurately and efficiently assembled.

Description

Technical Field

[0001] The invention relates to the technical field of motor assembly, and in particular to a press-fitting tool and a press-fitting method for a deep-cavity oil injection ring assembly of an oil-cooled motor housing. Background Art

[0002] In order to increase the power of new energy motors and reduce their size at the same time, the press-fitting cavity of the new energy motor housing is made deeper. During the assembly process, the oil injection ring at the outlet end adopts radial sealing. Due to the subsequent heating process, the radial sealing ring is not allowed to be oiled, which results in a relatively large press-fitting force and makes it difficult to assemble it into place.

[0003] The existing tooling has the following problems during the assembly process: 1. In order to avoid damage to the housing, the gap between some tooling and the motor housing is relatively large, which makes it easy to tilt when subjected to force, and then causes the sealing ring to be bitten. 2. Some tooling also contacts the axial sealing ring of the injection ring with a flat surface during assembly. The sealing ring has a rebound force after being compressed, which in turn interferes with the press-fitting, making it difficult to press the injection ring assembly into place. 3. Some tooling is placed into the motor housing successively with the injection ring during the assembly process. However, due to the large gap between the injection ring and the upper side of the housing, the manual placement of the injection ring is prone to eccentricity with the center line of the motor housing, resulting in friction between the radial sealing ring and the inner wall of the motor housing during the process of entering the groove, causing the radial sealing ring to fall out of the injection ring groove, resulting in rework and reassembly, affecting assembly efficiency.

[0004] Therefore, for the deep-cavity motor housing of new energy motors, it is urgently necessary to provide a press-fitting tool and a press-fitting method to assemble the fuel injection ring assembly quickly, accurately and efficiently. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a press-fitting tool and a press-fitting method for a deep cavity oil injection ring assembly of an oil-cooled motor housing, which can assemble the oil injection ring assembly quickly, accurately and efficiently.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a press-fitting tool for a deep-cavity oil injection ring assembly of an oil-cooled motor housing, characterized in that it includes a press-fitting frame and a press-fitting plate, the press-fitting plate includes an inner pressure ring made of metal and an outer pressure ring made of plastic, the upper side of the inner pressure ring is bent outward and extended to form an upper pressure plate, and the upper side of the outer pressure ring is bent inward and extended to form a lower pressure plate, so that the cross-sections of the inner pressure ring and the outer pressure ring are both in an inverted L shape, wherein the inner pressure ring is fixedly connected to the press-fitting frame, and the press-fitting frame can at least synchronously apply pressure to the opposite sides of the inner pressure ring; the outer pressure ring sleeve is inserted into the inner pressure ring from the lower end of the inner pressure ring and is fixedly connected to the inner pressure ring, wherein the upper side of the lower pressure plate of the outer pressure ring is in contact with the upper pressure plate, and the inner side is in contact with the inner pressure ring, so that an oil injection ring press-fitting groove is formed between the inner pressure ring and the outer pressure ring; the press-fitting frame has a press-fitting rod, and the press-fitting rod coincides with the axial center line of the press-fitting plate.

[0007] Furthermore, an annular groove is provided around the outer side of the inner pressure ring near the lower end, a positioning sealing ring is provided in the annular groove, and the outer side of the positioning sealing ring protrudes from the annular groove.

[0008] Furthermore, the cross section of the positioning sealing ring is I-shaped, and the thickness thereof gradually decreases from the middle to the two sides.

[0009] Furthermore, a convex edge surrounding the lower pressing plate is provided on the lower side of the lower pressing plate of the outer pressing ring near the inner edge.

[0010] Furthermore, the press-fitting frame includes two connecting nuts and a plurality of metal rods. The two connecting nuts are connected to the lower ends of the press-fitting rods by threaded cooperation, and there is a spacing between the two connecting nuts. At least two opposite sides of the lower connecting nut are fixedly connected to the inner pressure ring by a metal rod respectively, and one end of the metal rod away from the lower connecting nut is fixedly connected to the upper connecting nut by another metal rod, so that the metal rod and the two connecting nuts form at least one triangular frame structure.

[0011] Furthermore, a circular knocking plate is formed on the upper end of the press rod.

[0012] A press-fitting method for a deep cavity oil injection ring assembly of an oil-cooled motor housing, characterized in that the specific steps are as follows: 1) Process the above-mentioned press-fitting tooling according to the motor housing and injection ring assembly to be assembled; 2) Assemble the fuel injection ring assembly: install the axial sealing ring in the sealing ring groove on the upper side of the fuel injection ring, and install the radial sealing ring in the sealing ring groove of the convex ring on the side wall of the fuel injection ring; 3) Insert the upper side of the fuel injection ring into the gap between the inner pressure ring and the outer pressure ring, and fasten it to the press-fit plate through friction; 4) Fix the motor housing to the press-fitting stand with the assembly hole of the motor housing facing upwards, and then move the press-fitting tool and the oil injection ring above the assembly hole of the motor housing; 5) Rotate the press-fitting fixture to make the positioning point on the oil injection ring correspond to the positioning point on the motor housing, then install the press-fitting frame, press-fitting plate and oil injection ring into the motor housing until they are close to the installation position, and then make fine adjustments again to make the positioning point on the oil injection ring face the positioning point on the motor housing; 6) Finally, use a hammer to strike the striking plate at the upper end of the press rod to completely press the fuel injection ring into the motor housing, measure the distance between the upper end of the press rod and the upper end of the motor housing, and after confirming that the press is in place, pull up the striking rod, take out the entire press tooling, and complete the assembly of the fuel injection ring assembly.

[0013] Furthermore, in step 1), the outer diameter of the outer pressure ring of the press-fitting tool is consistent with the inner diameter of the motor housing to be assembled, the inner diameter of the outer pressure ring of the press-fitting tool is larger than the outer diameter of the injection ring to be assembled, and the height of the convex edge on the lower side of the lower pressure plate of the outer pressure ring is larger than the height of the axial sealing ring on the injection ring protruding from the upper part of the injection ring; when the injection ring is installed on the press-fitting plate, the lower side of the outer pressure ring is fitted with the upper side of the convex ring on the side wall of the injection ring, the convex edge on the lower side of the lower pressure plate is fitted with the upper side of the injection ring, and there is a gap between the outer wall of the injection ring and the inner wall of the outer pressure ring, and there is a gap between the axial sealing ring on the upper side of the injection ring and the lower side of the lower pressure plate.

[0014] Furthermore, in step 1), the outer diameter of the middle portion of the positioning seal ring is larger than the inner diameter of the oil injection ring, and when the oil injection ring is installed on the press-fit plate, the friction between the positioning seal ring and the oil injection ring can fasten the oil injection ring and the press-fit plate together.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The entire press-fitting tooling has a simple structure, is easy to process and has low cost. It can be used in a small space and is easy to use. It can assemble the fuel injection ring assembly quickly, accurately and efficiently.

[0016] 2. The outer pressure ring is made of plastic, and a positioning seal ring is provided on the outside of the inner pressure ring. During the entire press-fitting process of the injection ring assembly, it can effectively protect the motor housing, injection ring, axial seal ring and radial seal ring to avoid damage to each component, thereby greatly improving the assembly quality, reducing the rework rate and achieving high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure when the present invention is used.

[0018] Figure 2 for Figure 1 Enlarged view of part A in the figure.

[0019] In the figure: 101—connecting nut, 102—metal rod, 201—inner pressure ring, 202—outer pressure ring, 203—upper pressure plate, 204—lower pressure plate, 3—pressing rod, 4—positioning sealing ring, 5—convex edge, 6—knocking plate, 7—motor housing, 8—injection ring, 9—axial sealing ring, 10—convex ring, 11—radial sealing ring. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example: See Figure 1 , Figure 2, a press-fitting tool for a deep-cavity oil injection ring assembly of an oil-cooled motor housing, including a press-fitting frame and a press-fitting plate. The press-fitting plate includes an inner pressure ring 201 made of metal and an outer pressure ring 202 made of plastic. During actual production, the outer pressure ring 202 is made of engineering plastic, preferably PA66+GF30 material, so that the outer pressure ring 202 has higher strength, is more wear-resistant and pressure-resistant. The upper side of the inner pressure ring 201 is bent outward and extended to form an upper pressure plate 203, and the upper side of the outer pressure ring 202 is bent inward and extended to form a lower pressure plate 204, so that the cross-sections of the inner pressure ring 201 and the outer pressure ring 202 are both inverted L-shaped. Among them, the inner pressure ring 201 is fixedly connected to the press-fitting frame, and the press-fitting frame can at least simultaneously apply pressure to the opposite sides of the inner pressure ring 201, so as to prevent unilateral force deflection and tilt. During processing, according to the size of the motor housing 7 that needs to be assembled, the outer side of the outer pressure ring 202 is processed to be consistent with the inner side profile of the motor housing 7, and only a clearance fit is required, which can avoid eccentricity of the tooling and the injection ring 8 during the assembly process, and can play a good guiding role during the press-fitting process. At the same time, in order to better protect the motor housing 7, the outer diameter of the upper pressure plate 203 of the inner pressure ring 201 is smaller than the outer diameter of the outer pressure ring 202, so that a gap can be formed between the upper pressure plate 203 and the motor housing 7 during the assembly process, thereby preventing the metal inner pressure ring 201 from scratching the inner wall of the motor housing 7.

[0024] The outer pressure ring 202 is inserted into the inner pressure ring 201 from the lower end of the inner pressure ring 201 and fixedly connected with the inner pressure ring 201, wherein the upper side of the lower pressure plate 204 of the outer pressure ring 202 is in contact with the upper pressure plate 203, and the inner side is in contact with the inner pressure ring 201, and the contact surfaces of the inner pressure ring 201 and the outer pressure ring 202 are bonded together by glue, so that a press-fitting groove for the injection ring 8 is formed between the inner pressure ring 201 and the outer pressure ring 202. In specific implementation, a convex edge 5 is provided around the lower pressure plate 204 near the inner edge on the lower side of the outer pressure ring 202, so that a groove is formed between the convex edge 5 and the outer pressure ring 202. Since an axial sealing ring 9 is installed on the upper side of the injection ring 8, after the groove is formed, it can make way for the axial sealing ring 9, so as to prevent the lower pressure plate 204 from directly pressing on the axial sealing ring 9 during the press-fitting process, causing damage to the axial sealing ring 9. The outer side of the inner pressure ring 201 is provided with an annular groove around it near the lower end, and a positioning seal ring 4 is provided in the annular groove, and the outer side of the positioning seal ring 4 protrudes from the annular groove. During the processing, the positioning seal ring 4 is pre-stretched during the installation process to ensure the stability between it and the inner pressure ring 201; at the same time, the maximum outer diameter of the part of the positioning seal ring 4 protruding from the inner pressure ring 201 is greater than the inner diameter of the injection ring 8 to be assembled. When the injection ring 8 is assembled, since the positioning seal ring 4 protrudes from the side wall of the inner pressure ring 201, it can contact with the inner wall of the injection ring 8 and form extrusion to generate friction. However, since the seal ring is generally made of flexible plastic, it will not cause damage to the injection ring 8. At this time, as long as the injection ring 8 is pushed hard to make its upper side fit with the convex edge 5 on the lower side of the lower pressure plate 204, the assembly of the injection ring 8 and the press plate can be completed; due to the existence of friction, the injection ring 8 can be prevented from falling off the tooling during assembly. Preferably, the cross section of the positioning sealing ring 4 is I-shaped, and the thickness gradually decreases from the middle to the two sides; thereby facilitating the installation of the injection ring 8 and the removal of the pressing tool after the injection ring 8 is pressed.

[0025] The press-fitting frame has a press-fitting rod 3, and the press-fitting rod 3 coincides with the axis of the press-fitting disk. Specifically, the press-fitting frame includes two connecting nuts 101 and a plurality of metal rods 102. The two connecting nuts 101 are connected to the lower end of the press-fitting rod 3 by threaded cooperation, and there is a spacing between the two connecting nuts 101. During implementation, the connecting nut 101 adopts a hexagonal flange nut of M10, and the press-fitting rod 3 adopts a metal strip screw rod of φ10. After the assembly position of the connecting nut 101 and the press-fitting rod 3 is adjusted in place, they are fixed by fastening glue. At least two opposite sides of the lower connecting nut 101 are fixedly connected to the inner pressure ring 201 by a metal rod 102 respectively, and one end of the metal rod 102 away from the lower connecting nut 101 is fixedly connected to the upper connecting nut 101 by another metal rod 102, so that the metal rod 102 and the two connecting nuts 101 form at least one triangular frame structure. Among them, the metal rod 102 is fixed to the adjacent flange surfaces of the two connecting nuts 101. In specific implementation, multiple metal rods 102 are symmetrically distributed around the outer side of the lower connecting nut 101. Correspondingly, multiple metal rods 102 are connected to the upper nut through another metal rod 102, and the two connected metal rods 102 are connected to the inner pressure ring 201 at the same time. During processing, the metal rods 102, the metal rods 102 and the connecting nut 101, and the metal rods 102 and the inner pressure ring 201 are fixed by welding, so that the overall stability is better and the processing is more convenient. In this way, the pressure on the support frame can be evenly transmitted to the inner pressure ring 201, and finally to the injection ring 8, and the metal strips form a triangular frame structure as a whole, and the force transmission is more stable. The upper end of the press rod 3 is formed with a circular knocking plate 6; so that it is convenient to drop the knocking hammer during the press fitting process, and it is also convenient to pull the entire tooling out after the press fitting is completed.

[0026] See also Figure 1 , Figure 2 The present invention also discloses a press-fitting method for the deep cavity oil injection ring 8 assembly of the oil-cooled motor housing 7, and the specific steps are as follows: 1) The above-mentioned press-fitting tool is processed according to the (shape and size of) the motor housing 7 and the oil injection ring 8 assembly to be assembled. Specifically, the outer diameter of the outer pressure ring 202 of the press-fitting tool is consistent with the inner diameter of the motor housing 7 to be assembled (and can form a clearance fit), the inner diameter of the outer pressure ring 202 of the press-fitting tool is larger than the outer diameter of the oil injection ring 8 to be assembled, and the height of the convex edge 5 on the lower side of the lower pressure plate 204 of the outer pressure ring 202 is larger than the height of the axial sealing ring 9 on the oil injection ring 8 protruding from the upper side of the oil injection ring 8. When the oil injection ring 8 is installed on the press-fitting plate, the lower side of the outer pressure ring 202 fits with the upper side of the convex ring 10 on the side wall of the oil injection ring 8 (wherein the convex ring 10 is a fixed structure on the outer wall of the oil injection ring 8 for installing the radial sealing ring 11, and is an integral structure with the oil injection ring 8), the convex edge 5 on the lower side of the lower pressure plate 204 fits with the upper side of the oil injection ring 8, and there is a gap between the outer wall of the oil injection ring 8 and the inner wall of the outer pressure ring 202, and there is a gap between the axial sealing ring 9 on the upper side of the oil injection ring 8 and the lower side of the lower pressure plate 204. The outer diameter of the middle part of the positioning sealing ring 4 is larger than the inner diameter of the oil injection ring 8, and when the oil injection ring 8 is installed on the press-fitting plate, the friction between the positioning sealing ring 4 and the oil injection ring 8 can fasten the oil injection ring 8 to the press-fitting plate. Preferably, during processing, the length of the press-fitting rod 3 is larger than the length of the motor housing 7.

[0027] 2) Assemble the fuel injection ring 8 assembly: install the axial sealing ring 9 in the sealing ring groove on the upper side of the fuel injection ring 8, and install the radial sealing ring 11 in the sealing ring groove of the convex ring 10 on the side wall of the fuel injection ring 8.

[0028] 3) Insert the upper side of the oil injection ring 8 into the gap between the inner pressure ring 201 and the outer pressure ring 202, and fasten it to the press-fit plate through friction.

[0029] 4) Fix the motor housing 7 to the press-fitting stand with the assembly hole of the motor housing 7 facing upwards, and then move the press-fitting tool and the oil injection ring 8 to above the assembly hole of the motor housing 7.

[0030] 5) Rotate the press-fitting tool to make the positioning point on the oil injection ring 8 correspond to the positioning point on the motor housing 7, then install the press-fitting frame, press-fitting plate and oil injection ring 8 into the motor housing 7 until they are close to the installation position, and then make fine adjustments again to make the positioning point on the oil injection ring 8 face the positioning point on the motor housing 7.

[0031] 6) Finally, use a hammer to strike the striking plate 6 at the upper end of the press rod 3, completely press the oil injection ring 8 into the motor housing 7, measure the distance between the upper end of the press rod 3 and the upper end of the motor housing 7, and after confirming that the press is in place, pull up the striking rod, take out the entire press tooling, and complete the assembly of the oil injection ring 8. Specifically, before batch assembly, pre-assemble a standard for the press-fitting of the oil injection ring 8 to calibrate the distance between the upper end of the press rod 3 and the upper end of the motor housing 7, so that the press accuracy can be effectively guaranteed during subsequent batch assembly.

[0032] The scheme disclosed by the present invention has a simple structure of the entire press-fitting tool, is easy to process and has low cost, can be used in a small space, is easy to use, and can assemble the fuel injection ring assembly quickly, accurately and efficiently. At the same time, the outer pressure ring is made of plastic, and a positioning seal ring is provided on the outer side of the inner pressure ring. During the entire press-fitting process of the fuel injection ring assembly, the motor housing, fuel injection ring, axial seal ring and radial seal ring can be effectively protected to avoid damage to various components, thereby greatly improving the assembly quality, reducing the rework rate, and having high reliability.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A press-fitting tool for a deep cavity oil injection ring assembly of an oil-cooled motor housing, characterized in that: The press-fitting frame comprises a press-fitting plate, wherein the press-fitting plate comprises an inner pressure ring (201) made of metal and an outer pressure ring (202) made of plastic, wherein the upper side of the inner pressure ring is bent outward and extended to form an upper pressure plate (203), and the upper side of the outer pressure ring is bent inward and extended to form a lower pressure plate (204), so that the cross-sections of the inner pressure ring and the outer pressure ring are both in an inverted L shape, wherein the inner pressure ring is fixedly connected to the press-fitting frame, and the press-fitting frame can at least synchronously apply pressure to the opposite sides of the inner pressure ring; the outer pressure ring sleeve is inserted into the inner pressure ring from the lower end of the inner pressure ring and is fixedly connected to the inner pressure ring, wherein the upper side of the lower pressure plate of the outer pressure ring is in contact with the upper pressure plate, and the inner side is in contact with the inner pressure ring, so that an injection ring press-fitting groove is formed between the inner pressure ring and the outer pressure ring; the press-fitting frame has a press-fitting rod (3), and the press-fitting rod coincides with the axis of the press-fitting plate.

2. According to claim 1, a press-fitting tool for a deep cavity oil injection ring assembly of an oil-cooled motor housing, characterized in that: An annular groove is provided on the outer side of the inner pressure ring near the lower end thereof and surrounds the inner pressure ring. A positioning sealing ring (4) is provided in the annular groove, and the outer side of the positioning sealing ring protrudes from the annular groove.

3. The deep cavity oil injection ring assembly press-fitting tool for oil-cooled motor housing according to claim 2 is characterized in that: The cross section of the positioning sealing ring is I-shaped, and the thickness thereof gradually decreases from the middle to the two sides.

4. The deep cavity oil injection ring assembly press-fitting tool for oil-cooled motor housing according to claim 1 is characterized in that: A convex edge (5) is provided on the lower side of the lower pressing plate of the outer pressing ring, near the inner edge, and surrounds the lower pressing plate.

5. The deep cavity oil injection ring assembly press-fitting tool for oil-cooled motor housing according to claim 1 is characterized in that: The press-fitting frame comprises two connecting nuts (101) and a plurality of metal rods (102); the two connecting nuts are threadedly connected to the lower ends of the press-fitting rods, and a spacing is provided between the two connecting nuts; at least two opposite sides of the lower connecting nut are fixedly connected to the inner pressure ring via a metal rod, and one end of the metal rod away from the lower connecting nut is fixedly connected to the upper connecting nut via another metal rod, so that the metal rod and the two connecting nuts form at least one triangular frame structure.

6. The deep cavity oil injection ring assembly press-fitting tool for oil-cooled motor housing according to claim 1 is characterized in that: The upper end of the press rod is formed with a circular knocking plate (6).

7. A method for press-fitting a deep cavity oil injection ring assembly of an oil-cooled motor housing, characterized in that: The specific steps are as follows: 1) processing the press-fitting tool as described in any one of claims 1 to 6 according to the motor housing (7) and the injection ring assembly to be assembled; 2) Assemble the fuel injection ring assembly: install the axial sealing ring (9) in the sealing ring groove on the upper side of the fuel injection ring (8), and install the radial sealing ring (11) in the sealing ring groove of the convex ring (10) on the side wall of the fuel injection ring; 3) Insert the upper side of the fuel injection ring into the gap between the inner pressure ring and the outer pressure ring, and fasten it to the press-fit plate through friction; 4) Fix the motor housing to the press-fitting stand with the assembly hole of the motor housing facing upwards, and then move the press-fitting tool and the oil injection ring above the assembly hole of the motor housing; 5) Rotate the press-fitting fixture to make the positioning point on the oil injection ring correspond to the positioning point on the motor housing, then install the press-fitting frame, press-fitting plate and oil injection ring into the motor housing until they are close to the installation position, and then make fine adjustments again to make the positioning point on the oil injection ring face the positioning point on the motor housing; 6) Finally, use a hammer to strike the striking plate at the upper end of the press rod to completely press the fuel injection ring into the motor housing, measure the distance between the upper end of the press rod and the upper end of the motor housing, and after confirming that the press is in place, pull up the striking rod, take out the entire press tooling, and complete the assembly of the fuel injection ring assembly.

8. The press-fitting method of the deep cavity oil injection ring assembly of the oil-cooled motor housing according to claim 7 is characterized in that: In step 1), the outer diameter of the outer pressure ring of the press-fitting tool is consistent with the inner diameter of the motor housing to be assembled, the inner diameter of the outer pressure ring of the press-fitting tool is larger than the outer diameter of the injection ring to be assembled, and the height of the convex edge on the lower side of the lower pressure plate of the outer pressure ring is larger than the height of the axial sealing ring on the injection ring protruding from the upper part of the injection ring; when the injection ring is installed on the press-fitting plate, the lower side of the outer pressure ring is fitted with the upper side of the convex ring on the side wall of the injection ring, the convex edge on the lower side of the lower pressure plate is fitted with the upper side of the injection ring, and there is a gap between the outer wall of the injection ring and the inner wall of the outer pressure ring, and there is a gap between the axial sealing ring on the upper side of the injection ring and the lower side of the lower pressure plate.

9. The press-fitting method of the deep cavity oil injection ring assembly of the oil-cooled motor housing according to claim 7 is characterized in that: In step 1), the outer diameter of the middle portion of the positioning seal ring is larger than the inner diameter of the oil injection ring, and when the oil injection ring is installed on the press-fit plate, the friction between the positioning seal ring and the oil injection ring can fasten the oil injection ring and the press-fit plate together.

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