A press-fitting tool and press-fitting method for a deep-cavity oil injection ring assembly of an oil-cooled motor housing

Abstract

The present invention discloses a press-fitting tool and method for a deep-cavity oil spray ring assembly for an oil-cooled motor housing. The press-fitting tool comprises a press-fitting frame and a press-fitting plate. The press-fitting plate comprises an inner pressure ring and an outer pressure ring. The upper side of the inner pressure ring forms an upper pressure plate, and the upper side of the outer pressure ring forms a lower pressure plate. The inner pressure ring is fixedly connected to the press-fitting frame; the outer pressure ring sleeve is fixedly connected to the inner pressure ring; and the press-fitting frame has a press-fitting rod. The press-fitting method is as follows: 1) machining the press-fitting tool; 2) assembling the oil spray ring assembly; 3) fastening the oil spray ring to the press-fitting plate; 4) moving the press-fitting tool and the oil spray ring to the top of the motor housing; 5) installing the press-fitting frame, press-fitting plate, and oil spray ring into the motor housing; and 6) completing assembly of the oil spray ring assembly. The present invention enables rapid, accurate, and efficient assembly of the oil spray ring assembly.

Description

Technical Field

[0001] The present 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 spray 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 relatively deep; 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 assembly more difficult.

[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 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. After the sealing ring is compressed, there is a rebound force, 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 one after another 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, there is an urgent need 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, the object of the present invention is to provide a press-fitting tool and press-fitting method for a deep-cavity oil spray ring assembly of an oil-cooled motor housing, which can assemble the oil spray ring assembly quickly, accurately and efficiently.

[0006] The outer ring is pressed against the outer ring of the outer ring so that the oil injection ring is pressed into the oil-cooling motor housing and the outer ring is pressed into the oil-cooling motor housing.

[0007] Furthermore, an annular groove is provided on the outer side of the inner pressure ring near the lower end thereof, and 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 pressure plate is provided on the lower side of the outer pressure ring near the inner edge.

[0010] Furthermore, the press-fitting frame includes two connecting nuts and several metal rods. The two connecting nuts are connected to the lower ends of the press-fitting rods through threaded cooperation, and there is a distance between the two connecting nuts; at least two opposite sides of the lower connecting nut are fixedly connected to the inner pressure ring through 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 through 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 is characterized by the following specific steps:

[0013] 1) Process the above-mentioned press-fitting tooling according to the motor housing and oil injection ring assembly to be assembled;

[0014] 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;

[0015] 3) Insert the upper side of the oil 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;

[0016] 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 tooling and the oil injection ring above the assembly hole of the motor housing;

[0017] 5) Rotate the press-fitting fixture to align the positioning points on the oil injection ring with the positioning points on the motor housing. Then install the press-fitting frame, press-fitting plate and oil injection ring into the motor housing. When they are close to the installation position, make fine adjustments again to align the positioning points on the oil injection ring with the positioning points on the motor housing.

[0018] 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. After confirming that the press is in place, pull up the striking rod and remove the entire press tool to complete the assembly of the fuel injection ring assembly.

[0019] 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 in contact 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 in contact 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.

[0020] 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.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 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.

[0023] 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, avoiding damage to various components, thereby greatly improving assembly quality, reducing rework rate and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram when the present invention is used.

[0025] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0026] 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 - press-fitting rod, 4 - positioning sealing ring, 5 - raised edge, 6 - knocking plate, 7 - motor housing, 8 - oil injection ring, 9 - axial sealing ring, 10 - raised ring, 11 - radial sealing ring. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] 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 invention claimed for protection, but merely represents 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 making creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not require further definition or explanation in subsequent figures. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the figures, or the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention 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, and are therefore not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and are not to be construed as indicating or implying relative importance. Furthermore, terms such as "horizontal" and "vertical" do not imply that a component must be absolutely horizontal or overhanging, but rather may be slightly tilted. For example, "horizontal" simply refers to a direction that is more horizontal than "vertical," and does not imply that the structure must be completely horizontal, but rather may be slightly tilted. In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] Example: See Figure 1 、 Figure 2, a press-fitting tool for the deep-cavity oil injection ring assembly of an oil-cooled motor housing, comprising a press-fitting frame and a press-fitting plate. The press-fitting plate comprises 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 in an inverted L-shape. Among them, the inner pressure ring 201 is fixedly connected to the press-fitting frame, and the press-fitting frame can at least apply pressure to the opposite sides of the inner pressure ring 201 synchronously, preventing unilateral force deflection and tilt. During processing, the outer side of the outer pressure ring 202 is processed to be consistent with the inner contour of the motor housing 7 according to the actual size of the motor housing 7 to be assembled. Only a clearance fit is required. This can prevent the tooling and the oil injection ring 8 from being eccentric during the assembly process and can play a better guiding role during the press-fitting process. At the same time, 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. This allows a gap to 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.

[0031] 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 to the inner pressure ring 201. 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. 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 oil injection ring 8 is formed between the inner pressure ring 201 and the outer pressure ring 202. In a specific implementation, a convex edge 5 is provided on the lower side of the lower pressure plate 204 of the outer pressure ring 202 near the inner edge, which surrounds the lower pressure plate 204. 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 oil injection ring 8, the formation of the groove can make way for the axial sealing ring 9, preventing 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, near its lower end, is provided with a circumferential annular groove. A positioning seal ring 4 is positioned within this groove, with the outer side of the positioning seal ring 4 protruding beyond the groove. During processing, the positioning seal ring 4 is pre-stretched during installation to ensure stability between it and the inner pressure ring 201. Furthermore, the maximum outer diameter of the portion of the positioning seal ring 4 protruding beyond the inner pressure ring 201 is larger than the inner diameter of the injection ring 8 to be assembled. During assembly of the injection ring 8, since the positioning seal ring 4 protrudes beyond the sidewall of the inner pressure ring 201, it contacts the inner wall of the injection ring 8, creating friction. However, since the seal ring is generally made of flexible plastic, it does not damage the injection ring 8. At this point, the injection ring 8 can be assembled to the press plate by simply pushing it firmly until its upper side contacts the ridge 5 on the lower side of the lower pressure plate 204. This friction prevents the injection ring 8 from falling off the tooling during assembly. Preferably, the cross section of the positioning sealing ring 4 is I-shaped, and the thickness thereof 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.

[0032] 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 ends of the press-fitting rods 3 by threaded engagement, and there is a spacing between the two connecting nuts 101. During implementation, the connecting nuts 101 use M10 hexagonal flange nuts, and the press-fitting rods 3 use φ10 metal strip screws. After the connecting nuts 101 and the press-fitting rods 3 are adjusted to the assembly position, they are fixed by fasteners. 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, and the 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 rods 102 and the two connecting nuts 101 form at least one triangular frame structure. The metal rods 102 are fixed to the adjacent flange surfaces of the two connecting nuts 101. During specific implementation, a plurality of metal rods 102 are symmetrically distributed around the outer side of the lower connecting nut 101. Correspondingly, the plurality of 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 transferred 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; this is convenient for dropping the knocking hammer during the press fitting process, and is also convenient for pulling out the entire tooling after the press fitting is completed.

[0033] 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, the specific steps of which are as follows:

[0034] 1) The press-fitting tooling is fabricated based on the (shape and dimensions of) the motor housing 7 and fuel injection ring 8 assembly to be assembled. Specifically, the outer diameter of the press-fitting tooling's outer pressure ring 202 is consistent with the inner diameter of the motor housing 7 to be assembled (and provides a clearance fit). The inner diameter of the press-fitting tooling's outer pressure ring 202 is larger than the outer diameter of the fuel injection ring 8 to be assembled. Furthermore, the height of the ridge 5 on the lower side of the lower pressure plate 204 of the outer pressure ring 202 is greater than the height of the axial seal ring 9 on the fuel injection ring 8 protruding from the upper side of the fuel injection ring 8. When the oil injection ring 8 is installed on the press plate, the lower side of the outer pressure ring 202 mates with the upper side of the raised ring 10 on the side wall of the oil injection ring 8 (wherein the raised ring 10 is a fixed structure on the outer wall of the oil injection ring 8 for mounting the radial sealing ring 11 and is an integral structure with the oil injection ring 8). The raised edge 5 on the lower side of the lower pressure plate 204 mates with the upper side of the oil injection ring 8, and a gap exists between the outer wall of the oil injection ring 8 and the inner wall of the outer pressure ring 202. A gap also exists 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 central portion of the positioning seal 4 is larger than the inner diameter of the oil injection ring 8. When the oil injection ring 8 is installed on the press plate, the friction between the positioning seal 4 and the oil injection ring 8 secures the oil injection ring 8 to the press plate. Preferably, during processing, the length of the press rod 3 is greater than the length of the motor housing 7.

[0035] 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.

[0036] 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-fitting disk through friction.

[0037] 4) Fix the motor housing 7 to the press-fitting stand with the assembly hole of the motor housing 7 facing upward, and then move the press-fitting tool and the oil injection ring 8 above the assembly hole of the motor housing 7.

[0038] 5) Rotate the press-fitting fixture to align the positioning points on the oil injection ring 8 with the positioning points 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. Then, make fine adjustments again to align the positioning points on the oil injection ring 8 with the positioning points on the motor housing 7.

[0039] 6) Finally, use a hammer to strike the striking plate 6 at the upper end of the press-fitting rod 3, completely pressing the oil injection ring 8 into the motor housing 7. Measure the distance between the upper end of the press-fitting rod 3 and the upper end of the motor housing 7. Once the press-fit is confirmed, pull the striking rod upward to remove the entire press-fitting tool, completing the assembly of the oil injection ring 8. Specifically, before batch assembly, a pre-assembled standard for press-fitting the oil injection ring 8 is used to calibrate the distance between the upper end of the press-fitting rod 3 and the upper end of the motor housing 7. This ensures accurate press-fitting during subsequent batch assembly.

[0040] The disclosed solution features a simple press-fit tooling structure, easy processing, and low cost. It can be used in confined spaces and is easy to use, enabling quick, accurate, and efficient assembly of the fuel injection ring assembly. Furthermore, the outer pressure ring is made of plastic, and a positioning seal is provided on the outer side of the inner pressure ring. This effectively protects the motor housing, fuel injection ring, axial seal, and radial seal during the entire press-fit process, preventing damage to these components. This significantly improves assembly quality, reduces rework rates, and enhances reliability.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present invention that do not depart from the purpose and scope of the technical solutions of the present invention 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 for an oil-cooled motor housing, characterized by: The invention comprises a press-fitting frame and 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 provided from The lower end of the inner pressure ring is inserted into the inner pressure ring and 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 disk; the outer side of the inner pressure ring is provided with an annular groove around it near the lower end, and 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.

2. The press-fitting tool for the deep cavity oil injection ring assembly of the oil-cooled motor housing according to claim 1, 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.

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

4. The press-fitting tool for the deep cavity oil injection ring assembly of the 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), wherein the two connecting nuts are threadedly connected to the lower ends of the press-fitting rods, and a distance 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.

5. The press-fitting tool for the deep cavity oil injection ring assembly of the 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).

6. A press-fitting method for a deep cavity oil injection ring assembly for an oil-cooled motor housing, characterized in that: The specific steps are as follows: 1) Processing a press-fitting tool as described in any one of claims 1 to 5 based on the motor housing (7) and the oil 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 oil 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 tooling and the oil injection ring above the assembly hole of the motor housing; 5) Rotate the press-fitting fixture to align the positioning points on the oil injection ring with the positioning points on the motor housing. Then install the press-fitting frame, press-fitting plate and oil injection ring into the motor housing. When they are close to the installation position, make fine adjustments again to align the positioning points on the oil injection ring with the positioning points 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. After confirming that the press is in place, pull up the striking rod and remove the entire press tool to complete the assembly of the fuel injection ring assembly.

7. The press-fitting method for a deep cavity oil spray ring assembly for an oil-cooled motor housing according to claim 6, 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 oil 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 oil injection ring protruding from the upper part of the oil injection ring; when the oil injection ring is installed on the press-fitting plate, the lower side of the outer pressure ring is in contact with the upper side of the convex ring on the side wall of the oil injection ring, the convex edge on the lower side of the lower pressure plate is in contact with the upper side of the oil injection ring, and there is a gap between the outer wall of the oil 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 oil injection ring and the lower side of the lower pressure plate.

8. The press-fitting method for a deep cavity oil spray ring assembly for an oil-cooled motor housing according to claim 7, 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 mounted 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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