Sealing mechanism of middle bearing hole

Abstract

The utility model discloses a sealing mechanism of a middle bearing hole, which comprises a base and an air cylinder arranged on one side of the base, one end of a piston of the air cylinder is coaxially connected with an upper pressing plate, the upper pressing plate is in a hollow shape with two open ends, the other end of the upper pressing plate is sleeved with a lower pressing plate, and the lower pressing plate is connected with the piston of the air cylinder through a piston shaft; the outer wall of the side, facing the upper pressing plate, of the lower pressing plate is further sleeved with a first sealing ring. The lower pressing plate can be driven by the piston shaft to extrude the first sealing ring together with the upper pressing plate; according to the sealing mechanism of the middle bearing hole, the first sealing ring is used as a blocking material, the upper pressing plate and the lower pressing plate are matched to press and expand the first sealing ring to block the bearing hole in the radial direction, and the sealing stability is guaranteed. And pneumatic control is used for replacing an original manual bolt fastening method, so that the labor intensity is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to gearbox technical field, concretely relates to a sealing mechanism of intermediate bearing hole. BACKGROUND

[0002] With the rapid development of new energy heavy truck market, the demand for motor is also increasing, and the demand for motor shell as an important part of motor also increases. Generally, after the machining of the motor shell, in order to prevent the leakage phenomenon of the shell, air tightness detection needs to be carried out.

[0003] The choice of sealing mode determines whether the air tightness detection result is stable. The sealing of the intermediate bearing hole of the motor shell mainly has the following problems:

[0004] 1. When doing air tightness detection, due to the structural diversity of the motor shell, a manual plugging mode is generally adopted, a silica gel pad is placed on the center bearing hole of the shell, a steel plate is fastened by using a bolt, so as to press the silica gel pad, and the sealing effect is achieved. But this way needs artificial disassembly and assembly of the bolt all the time, not only the labor intensity is big, the efficiency is low, and the reliability of the sealing is also unstable.

[0005] 2. When batch air tightness detection is carried out, the silica gel pad is installed on the bottom side of the workpiece; a tool is also placed at the center bearing hole, and a sealing ring or a silica gel pad is installed on the tool. When working, the workpiece is pressed down by the steel plate driven by the upper side air cylinder, and the axial sealing is formed at the bottom side and the center bearing hole, but in actual operation, the height of the sealing pad at the bottom side and the center bearing hole is difficult to cooperate and adjust, which leads to the fact that the workpiece bottom side is not pressed tightly or the center bearing hole is not pressed tightly. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a sealing mechanism of intermediate bearing hole, which solves the problem that the sealing device in the prior art easily leads to the fact that the workpiece bottom side is not pressed tightly or the center bearing hole is not pressed tightly.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme: a sealing mechanism of intermediate bearing hole, which comprises a base, and further comprises a gas cylinder installed on one side of the base, one end of the piston of the gas cylinder is further coaxially connected with an upper pressing plate, the upper pressing plate is hollow at both ends, a lower pressing plate is sleeved with the other end of the upper pressing plate, and the lower pressing plate is connected with the piston of the gas cylinder through a piston shaft.

[0008] The outer wall of the side of the lower pressing plate facing the upper pressing plate is further sleeved with a first sealing ring.

[0009] The lower pressing plate can be driven by the piston shaft to press the first sealing ring together with the upper pressing plate.

[0010] The utility model discloses still have following technical features:

[0011] The upper pressing plate includes coaxially sleeved first upper pressing plate and second upper pressing plate.

[0012] The first upper pressing plate and the second upper pressing plate are both hollow cylindrical, the outer diameter of the first upper pressing plate is greater than the outer diameter of the second upper pressing plate, and the inner diameter of the first upper pressing plate is less than the inner diameter of the second upper pressing plate.

[0013] The end of the second upper pressing plate on the side away from the first upper pressing plate is a conical surface, the inner wall height of the second upper pressing plate is greater than the outer wall height of the first upper pressing plate, and the conical angle is 170°.

[0014] The first upper pressing plate is connected with the air cylinder, and the second upper pressing plate is sleeved with the lower pressing plate.

[0015] The lower pressing plate includes coaxially sleeved first lower pressing plate, second lower pressing plate and third lower pressing plate.

[0016] The first lower pressing plate is a circular truncated cone type and is sleeved in the second upper pressing plate, and the end with a larger diameter of the first lower pressing plate is connected with the second upper pressing plate.

[0017] The second lower pressing plate is a circular cylinder, and the diameter is greater than the diameter of the end with a larger diameter of the first lower pressing plate.

[0018] The end face of the second lower pressing plate on the side towards the first lower pressing plate is a conical surface, the conical surface is convex on the side towards the first lower pressing plate, and the conical angle is 170°.

[0019] The third lower pressing plate is a circular cylinder.

[0020] The lower pressing plate further includes a piston shaft mounting hole penetrating the lower pressing plate, and one end of the piston shaft is mounted in the piston shaft mounting hole.

[0021] The piston shaft mounting hole includes coaxially communicated first piston shaft mounting hole and second piston shaft mounting hole, and the diameter of the first piston shaft mounting hole is greater than the diameter of the second piston shaft mounting hole.

[0022] The first piston shaft mounting hole is on the side towards the upper pressing plate.

[0023] The second piston shaft mounting hole is provided with a thread.

[0024] The piston shaft includes a piston shaft body and coaxially connected lower pressing plate connecting section and air cylinder connecting section at both ends of the piston shaft body.

[0025] The lower pressing plate connecting section and the air cylinder connecting section are both provided with a thread on the outer side.

[0026] The lower pressing plate connecting section is connected with the second piston shaft mounting hole, and the cylinder connecting section is connected with one end of the cylinder piston.

[0027] The piston shaft body is further provided with a pair of sealing ring mounting grooves, and a pair of piston shaft sealing rings are arranged in the sealing ring mounting grooves.

[0028] The sealing ring mounting groove is arranged in the first piston shaft mounting hole.

[0029] The lower pressing plate connecting section penetrates through the third lower pressing plate and is provided with a square nut at the end, and a nut sealing ring is further arranged between the square nut and the third lower pressing plate.

[0030] The base is disc-shaped.

[0031] A plurality of countersunk holes are arranged on the base, and connecting bolts are arranged in the countersunk holes, so that the base, the cylinder and the upper pressing plate are connected and fixed.

[0032] A plurality of mounting holes are further arranged on the base, and the mounting holes are used for fixing the base on the air-tight instrument experimental workbench.

[0033] Compared with the prior art, the utility model has the following technical effects:

[0034] (I) the sealing mechanism of the intermediate bearing hole provided by the utility model uses the first sealing ring as the plugging material, and utilizes the cooperation of the upper pressing plate and the lower pressing plate to expand the first sealing ring in the radial direction to block the bearing hole, so that the sealing stability is ensured, and pneumatic control is used to replace the original manual fastening bolt method, so that the labor intensity is reduced.

[0035] (II) the sealing mechanism of the intermediate bearing hole provided by the utility model has the advantages of simple structure, convenient operation, safety and reliability and strong adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a general structure schematic view of the sealing mechanism of the intermediate bearing hole of the utility model.

[0037] Figure 2 It is a sectional structure schematic view of the sealing mechanism of the intermediate bearing hole of the utility model.

[0038] Figure 3 It is a schematic view of the cooperation of the lower pressing plate and the piston shaft of the utility model.

[0039] Figure 4 It is a schematic view of the cooperation of the upper pressing plate and the lower pressing plate of the utility model.

[0040] Figure 5 It is a structure schematic view of the piston shaft of the utility model.

[0041] Figure 6 The base structure schematic view of the utility model.

[0042] Figure 7 The air path arrangement schematic view when using of the utility model.

[0043] Figure 8 The center bearing hole position to be detected in prior art schematic view.

[0044] Figure 9 The sectional structure schematic view of the utility model. Figure 8

[0045] The meaning of each label in the drawing:

[0046] 1-base, 2-cylinder, 3-upper pressing plate, 4-lower pressing plate, 5-piston shaft, 6-first sealing ring, 7-square head nut, 8-nut sealing ring, 9-counterbore, 10-connecting bolt, 11-mounting hole, 12-center bearing hole.

[0047] 3-1 first upper pressing plate, 3-2 second upper pressing plate.

[0048] 4-1 first lower pressing plate, 4-2 second lower pressing plate, 4-3 third lower pressing plate.

[0049] 5-1 piston shaft body, 5-2 lower pressing plate connecting section, 5-3 cylinder connecting section, 5-4 sealing ring mounting groove, 5-5 piston shaft sealing ring.

[0050] 4-4-1 first piston shaft mounting hole, 4-4-2 second piston shaft mounting hole.

[0051] The specific content of the utility model is further explained and described in detail in combination with the embodiments. DETAILED DESCRIPTION

[0052] All components in the utility model, if no special description, all adopt the components known in the prior art.

[0053] The specific embodiments of the utility model are given below, and it should be noted that the utility model is not limited to the following specific embodiments, and any equivalent transformation based on the technical solutions of the application falls within the protection scope of the utility model.

[0054] Embodiment 1:

[0055] This embodiment gives a kind of sealing mechanism of intermediate bearing hole, such as Figure 1 ​As shown, including the base 1, also includes the installation in the base 1 one side of the cylinder 2, the piston of the cylinder 2 one end is also coaxially connected with the upper pressing plate 3, the upper pressing plate 3 is the hollow shape of both ends open, the other end of the upper pressing plate 3 is sleeved with the lower pressing plate 4, the lower pressing plate 4 is connected with the piston of the cylinder 2 through the piston shaft 5.

[0056] The lower pressing plate 4 is also sleeved with the first sealing ring 6 on the outer wall of the side towards the upper pressing plate 3.

[0057] The lower pressing plate 4 can be driven by the piston shaft 5 and the upper pressing plate 3 to extrude the first sealing ring 6.

[0058] As shown in the figure, Figure 1 Design a kind of sealing mechanism of intermediate bearing hole, which is composed of cylinder 2, piston shaft 5, upper pressing plate 3, lower pressing plate 4 and base 1, and the cylinder 2 adopts SDA63*25; The quick connector G1 / 4 is installed on the cylinder 2.

[0059] The first sealing ring 6 adopts φ71*5.3-G size O-ring.

[0060] As shown in the figure, Figure 2 When the cylinder 2 extends, the piston shaft 5 drives the lower pressing plate 4 to move forward, so that the first sealing ring 6 loosens; When the cylinder 2 retracts, the piston shaft 5 drives the lower pressing plate 4 to move backward, so that the first sealing ring 6 is pressed tightly, thereby forming extrusion with the inner wall of the bearing hole of the motor shell, achieving the sealing effect.

[0061] The device is based on automatic operation, high efficiency and low cost, and can be widely used in the center bearing hole sealing of motor shell parts.

[0062] As a preferred embodiment of the present application:

[0063] The upper pressing plate 3 includes coaxially sleeved first upper pressing plate 3-1 and second upper pressing plate 3-2.

[0064] The first upper pressing plate 3-1 and the second upper pressing plate 3-2 are both hollow cylinders, the outer diameter of the first upper pressing plate 3-1 is larger than that of the second upper pressing plate 3-2, and the inner diameter of the first upper pressing plate 3-1 is smaller than that of the second upper pressing plate 3-2.

[0065] The end of the second upper pressing plate 3-2 away from the first upper pressing plate 3-1 is a conical surface, the inner wall height of the second upper pressing plate 3-2 is greater than that of the first upper pressing plate 3-1, and the conical angle is 170°.

[0066] The first upper pressing plate 3-1 is connected with the cylinder 2, and the second upper pressing plate 3-2 is sleeved with the lower pressing plate 4.

[0067] As a preferred embodiment of the present application:

[0068] The lower pressing plate 4 comprises coaxially sleeved first lower pressing plate 4-1, second lower pressing plate 4-2 and third lower pressing plate 4-3.

[0069] The first lower pressing plate 4-1 is in the shape of a circular truncated cone and is sleeved in the second upper pressing plate 3-2, and the larger-diameter end of the first lower pressing plate 4-1 is connected with the second lower pressing plate 4-2.

[0070] The second lower pressing plate 4-2 is in the shape of a circular cylinder and has a diameter larger than that of the larger-diameter end of the first lower pressing plate 4-1.

[0071] The end face of the second lower pressing plate 4-2 towards the first lower pressing plate 4-1 is a conical face, which is convex towards the first lower pressing plate 4-1 and has a conical angle of 170°.

[0072] The third lower pressing plate 4-3 is in the shape of a circular cylinder.

[0073] The lower pressing plate 4 further comprises a piston shaft mounting hole 4-4 penetrating the lower pressing plate 4, and one end of the piston shaft 5 is mounted in the piston shaft mounting hole 4-4.

[0074] As shown in Figure 4 The upper pressing plate, the lower pressing plate and the sealing ring are designed with an inclined structure of 170° at the contact position. When the cylinder 2 is retracted, the first sealing ring 6 is expanded along the slope and is in contact with the inner wall of the bearing hole of the motor shell, thereby forming a radial seal and ensuring the stability of the air tightness. When the cylinder 2 is extended, the first sealing ring 6 is loosened along the slope, thereby ensuring the stability of the operation.

[0075] As a preferred embodiment of the present application:

[0076] The piston shaft mounting hole 4-4 comprises coaxially communicated first piston shaft mounting hole 4-4-1 and second piston shaft mounting hole 4-4-2, and the diameter of the first piston shaft mounting hole 4-4-1 is larger than that of the second piston shaft mounting hole 4-4-2.

[0077] The first piston shaft mounting hole 4-4-1 is towards the upper pressing plate 3.

[0078] The second piston shaft mounting hole 4-4-2 is provided with a thread.

[0079] As a preferred embodiment of the present application:

[0080] The piston shaft 5 comprises piston shaft body 5-1 and coaxially connected lower pressing plate connecting section 5-2 and cylinder connecting section 5-3 at both ends of the piston shaft body 5-1.

[0081] The outer sides of the lower pressing plate connecting section 5-2 and the cylinder connecting section 5-3 are provided with threads.

[0082] The lower pressing plate connecting section 5-2 is matched with the second piston shaft mounting hole 4-4-2, and the cylinder connecting section 5-3 is connected with one end of the piston of the cylinder 2.

[0083] As shown in the figure, the piston shaft 5 is screwed at both ends and is connected with the cylinder 2 and the lower pressing plate 4 respectively. Figure 5

[0084] As a preferred embodiment of the present application:

[0085] The piston shaft body 5-1 is further provided with a pair of sealing ring mounting grooves 5-4, and a pair of piston shaft sealing rings 5-5 are arranged in the sealing ring mounting grooves 5-4.

[0086] The sealing ring mounting grooves 5-4 are located in the first piston shaft mounting hole 4-4-1.

[0087] The piston shaft body 5-1 is provided with the sealing ring mounting grooves 5-4, and the two piston shaft sealing rings 5-5 are sized φ9*1.8-G and are fixed in the sealing ring mounting grooves 5-4 on the shaft.

[0088] As shown in the figure, when the piston shaft 5 is inserted into the hole of the lower pressing plate 4, the piston shaft sealing ring 5-5 is in contact with the inner wall of the second piston shaft mounting hole 4-4-2, forming extrusion, and realizing the sealing of the piston shaft mounting hole 4-4 of the lower pressing plate 4. Figure 3 As a preferred embodiment of the present application:

[0089] The lower pressing plate connecting section 5-2 penetrates the third lower pressing plate 4-3 and is provided with a square nut 7 at the end, and a nut sealing ring 8 is further arranged between the square nut 7 and the third lower pressing plate 4-3.

[0090] The lower pressing plate 4 is designed with an end face sealing groove, and the nut sealing ring 8 is an O-ring φ

[0091] 12.1*1.8-G is fixed in the sealing groove by the square nut 7, preventing the test gas from leaking from the threads.

[0092] As a preferred embodiment of the present application:

[0093] As shown in the figure, the base 1 is disc-shaped.

[0094] Figure 6 A plurality of countersunk holes 9 are formed in the base 1, and connecting bolts 10 are arranged in the countersunk holes 9, which connect and fix the base 1, the cylinder 2 and the upper pressing plate 3.

[0095] A plurality of mounting holes 11 are further formed in the base 1, which are used to fix the base 1 on the air-tightness instrument experimental workbench.

[0096] A plurality of mounting holes 11 are further formed in the base 1, which are used to fix the base 1 on the air-tightness instrument experimental workbench. ​​

[0097] The connecting bolt 10 is an M10*100 internal hexagonal bolt.

[0098] The base 1 has four φ11 counterbore holes, and the connecting bolt 10 connects and fixes the base 1, the cylinder 2 and the upper pressing plate 3 together through the counterbore holes 9.

[0099] The specific working process of the utility model is as follows:

[0100] As shown in the figure, the specific operation steps of the sealing mechanism of the intermediate bearing hole 12 are as follows: Figures 7-9

[0101] Place the motor shell on the fixture table top.

[0102] Press the start button, the electromagnetic valve coil YV1 is attracted, the filtered compressed air enters the A port of the cylinder 2 through the electromagnetic valve, the cylinder 2 is controlled to retract, the first sealing ring 6 is pressed tightly and contacted with the inner wall of the shell, and the sealing of the central bearing hole 12 is realized.

[0103] Test and detect.

[0104] After the leak detection is completed, press the stop button, the electromagnetic valve coil YV2 is attracted, the compressed air enters the cylinder 2 from the B port, the cylinder 2 is controlled to extend, and the first sealing ring 6 is loosened.

[0105] Take the part off the tooling.

[0106] End.

[0107] The above technical scheme is only a relatively preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can think of changes or replacements within the technical range disclosed by the utility model without creative labor, which are all covered in the protection scope of the utility model.​

Claims

1. A sealing mechanism for an intermediate bearing bore, comprising a base (1), characterized in that Further comprising a cylinder (2) installed on one side of the base (1), one end of the piston of the cylinder (2) is also coaxially connected with an upper pressing plate (3), the upper pressing plate (3) is hollow with both ends open, the other end of the upper pressing plate (3) is sleeved with a lower pressing plate (4), the lower pressing plate (4) is connected with the piston of the cylinder (2) through a piston shaft (5); The outer wall of one side of the lower pressing plate (4) facing the upper pressing plate (3) is also sleeved with a first sealing ring (6); The lower pressing plate (4) can be driven by the piston shaft (5) to extrude the first sealing ring (6) together with the upper pressing plate (3).

2. A seal mechanism for an intermediate bearing bore as set forth in claim 1, wherein, The upper pressing plate (3) comprises a first upper pressing plate (3-1) and a second upper pressing plate (3-2) which are coaxially sleeved; The first upper pressing plate (3-1) and the second upper pressing plate (3-2) are both hollow cylinders, the outer diameter of the first upper pressing plate (3-1) is larger than the outer diameter of the second upper pressing plate (3-2), and the inner diameter of the first upper pressing plate (3-1) is smaller than the inner diameter of the second upper pressing plate (3-2); The end of the second upper pressing plate (3-2) away from the first upper pressing plate (3-1) is a conical surface, the inner wall height of the second upper pressing plate (3-2) is greater than the outer wall height of the first upper pressing plate (3-1), and the conical angle is 170°; The first upper pressing plate (3-1) is connected with the cylinder (2), and the second upper pressing plate (3-2) is sleeved with the lower pressing plate (4).

3. A seal mechanism for an intermediate bearing bore as set forth in claim 2, wherein, The lower pressing plate (4) comprises a first lower pressing plate (4-1), a second lower pressing plate (4-2) and a third lower pressing plate (4-3) which are coaxially sleeved; The first lower pressing plate (4-1) is a circular truncated cone and is sleeved in the second upper pressing plate (3-2), and the larger diameter end of the first lower pressing plate (4-1) is connected with the second lower pressing plate (4-2); The second lower pressing plate (4-2) is a circular cylinder, and the diameter is greater than the diameter of the larger diameter end of the first lower pressing plate (4-1); The end face of the second lower pressing plate (4-2) facing the first lower pressing plate (4-1) is a conical surface, the conical surface protrudes towards the first lower pressing plate (4-1), and the conical angle is 170°; The third lower pressing plate (4-3) is a circular cylinder; The lower pressing plate (4) further comprises a piston shaft mounting hole (4-4) penetrating through the lower pressing plate (4), and one end of the piston shaft (5) is mounted in the piston shaft mounting hole (4-4).

4. A seal mechanism for an intermediate bearing bore as set forth in claim 3, wherein, The piston shaft mounting hole (4-4) comprises a first piston shaft mounting hole (4-4-1) and a second piston shaft mounting hole (4-4-2) which are coaxially connected and communicated, and the diameter of the first piston shaft mounting hole (4-4-1) is greater than the diameter of the second piston shaft mounting hole (4-4-2); The first piston shaft mounting hole (4-4-1) is towards the upper pressing plate (3) side; The second piston shaft mounting hole (4-4-2) is provided with a thread.

5. A seal mechanism for an intermediate bearing bore as set forth in claim 4, wherein, The piston shaft (5) comprises a piston shaft body (5-1), a lower pressing plate connecting section (5-2) and a cylinder connecting section (5-3) which are coaxially connected at both ends of the piston shaft body (5-1); The outer sides of the lower pressing plate connecting section (5-2) and the cylinder connecting section (5-3) are provided with threads; The lower pressing plate connecting section (5-2) is matched with the second piston shaft mounting hole (4-4-2), and the cylinder connecting section (5-3) is connected with one end of the piston of the cylinder (2).

6. A seal mechanism for an intermediate bearing bore as set forth in claim 5, wherein, A pair of sealing ring mounting grooves (5-4) are further formed in the piston shaft body (5-1), and a pair of piston shaft sealing rings (5-5) are arranged in the sealing ring mounting grooves (5-4). The sealing ring mounting grooves (5-4) are located in the first piston shaft mounting hole (4-4-1).

7. A seal mechanism for an intermediate bearing bore as set forth in claim 6, wherein, The lower pressing plate connecting section (5-2) penetrates through the third lower pressing plate (4-3) and is provided with a square nut (7) at the end, and a nut sealing ring (8) is further arranged between the square nut (7) and the third lower pressing plate (4-3).

8. A seal mechanism for an intermediate bearing bore as set forth in claim 1, wherein, The base (1) is disc-shaped. A plurality of countersunk holes (9) are formed in the base (1), and connecting bolts (10) are arranged in the countersunk holes (9), which connect and fix the base (1), the cylinder (2) and the upper pressing plate (3). A plurality of mounting holes (11) are further formed in the base (1), which are used for fixing the base (1) on a gas tightness instrument experimental workbench.

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