Electric pump

Abstract

The utility model relates to an electric pump, the electric pump comprises a bottom cover, a separation part, a connector and a control assembly, the bottom cover is fixedly connected with the separation part, the separation part comprises a body part and a connector part, the body part comprises a containing part and a connector groove, at least part of the control assembly is located in the containing part, and the connector part is located in the connector groove. At least part of the connector is located in the insertion slot, the insertion part is provided with an insertion hole, the insertion hole is communicated with the insertion slot, the control assembly comprises a circuit board, the connector is electrically connected with the circuit board, and in the axial direction of the electric pump, the circuit board is close to the bottom cover relative to the slot bottom of the insertion slot. The structure has the advantage of being low in axial height.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more particularly to an electric pump. Background Technology

[0002] The electric pump primarily provides a power source for the lubrication and / or cooling systems of a vehicle. The electric pump includes a bottom cover, a circuit board, a mounting plate, and a connector. The bottom cover is fixedly connected to the mounting plate, and the connector is an integral part of the mounting plate. The connector includes a first end and a second end. The first end is electrically connected to the circuit board, and the second end is located in a slot on the mounting plate and can be electrically connected to an external power source. The bottom cover has an end face, and at least a portion of the groove wall of the contact groove protrudes from the end face. In the axial direction of the electric pump, the maximum distance from the circuit board to the end face is greater than the maximum distance from the bottom wall of the slot to the end face, resulting in a relatively high axial height for the electric pump. Utility Model Content

[0003] This application provides an electric pump that facilitates a reduction in the axial height of the electric pump.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] An electric pump includes a bottom cover, a partition, a connector, and a control assembly. The bottom cover is fixedly connected to the partition. The partition includes a body and a connector. The body includes a receiving portion and a slot. At least a portion of the control assembly is located in the receiving portion, and at least a portion of the connector is located in the slot. The connector has a connector hole communicating with the slot. The control assembly includes a circuit board. The connector is electrically connected to the circuit board. In the axial direction of the electric pump, the circuit board is close to the bottom cover relative to the bottom wall of the slot.

[0006] In the above technical solution, the partition includes a body and a connector. The body includes a slot, and at least part of the connector is located in the slot. The connector has a hole that communicates with the slot. The control component includes a circuit board, and the connector is electrically connected to the circuit board. In the axial direction of the electric pump, the circuit board is closer to the bottom cover relative to the bottom of the slot. The maximum axial distance from the connector to the circuit board is small, which is beneficial to reducing the axial height of the electric pump. Attached Figure Description

[0007] Figure 1 This is an example diagram of an embodiment of the electric pump of this application;

[0008] Figure 2 This is a schematic diagram of another embodiment of the electric pump of this application;

[0009] Figure 3A schematic diagram from one perspective showing the assembly of the partition, circuit board, winding electrical connection, connector and bottom cover;

[0010] Figure 4 for Figure 3 A schematic diagram of the AA section of the first embodiment;

[0011] Figure 5 for Figure 3 A schematic diagram of the AA section of the second embodiment;

[0012] Figure 6 A schematic diagram from one perspective showing the assembly of the partition, circuit board, connector, winding electrical connection and stator assembly;

[0013] Figure 7 for Figure 6 Schematic diagram of the BB section;

[0014] Figure 8 A schematic diagram from one perspective showing the assembly of the separator, circuit board, winding electrical connection, and connector;

[0015] Figure 9 A schematic diagram from one perspective showing the assembly of the separator, winding electrical connection, and connector;

[0016] Figure 10 A schematic diagram from another perspective of the assembly of the separator, winding electrical connection, and connector;

[0017] Figure 11 A schematic diagram of the control components;

[0018] Figure 12 This is a schematic diagram of the connector.

[0019] Reference numerals: 1. Pump housing; 11. Motor housing; 111. First sub-housing; 112. Second sub-housing; 12. Bottom cover; 14. Pump cover; 2. Connector; 21. First part; 22. Second part; 23. Third part; 231. First sub-part; 232. Second sub-part; 3. Partition; 31. Main body; 311. Receiving part; 3111. First wall; 3112. Second wall; 3113. First inner wall; 3114. Second inner wall; 312. Connecting slot; 3121. Slot bottom wall; 313. First end face; 314. Stepped part; 3141. Bottom wall; 3142. Side wall; 315. Second end face; 316. Groove; 317. Receiving groove; 318. Through hole; 32. Connecting part; 321. Connecting hole; 4. Pump rotor; 41. First rotor; 42. Second rotor; 5. Stator assembly; 51. Stator core; 52. Winding; 6. Motor rotor; 7. Shaft; 8. Control assembly; 81. Circuit board; 811. Mounting hole; 82. Electronic component; 821. First electronic component; 822. Second electronic component; 9. Winding electrical connection part; 91. First electrical connection part; 92. Fixing part; 93. Second electrical connection part; 20. Pump chamber; 30. Motor chamber; 40. Electrical control chamber. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other technical solutions can be obtained based on these technical solutions without creative effort. The directional terms such as "upper" and "lower" used herein are defined by the relative positions of the components shown in the accompanying drawings, and are only used for clarity and convenience in expressing the technical solutions. It should be understood that the directional terms used herein should not limit the scope of protection claimed in this application.

[0021] Electric pumps can be applied to automotive lubrication and / or cooling systems, providing circulating power for the working medium in these systems, which in turn provide lubricating oil and / or cooling oil to the transmission system. In this application, "A and B fixed connection" means that there is no relative displacement between A and B after the connection, such as A and B being welded together; "A and B limiting connection" means that A restricts B's movement in a certain direction, or B restricts A's movement in a certain direction.

[0022] Please refer to Figure 1 and Figure 2The electric pump includes a pump housing 1, which includes a pump cover 14, a motor housing 11, and a bottom cover 12. The pump cover 14 is fixedly connected to the motor housing 11, for example, by screws or bolts. Of course, the pump cover 14 and the motor housing 11 can also be connected by other methods, such as plug-in or snap-fit. The electric pump includes a pump rotor 4, a stator assembly 5, a motor rotor 6, a shaft 7, and a control assembly 8. The stator assembly 5 surrounds the motor rotor 6 radially outside the motor rotor 6, and the shaft 7 is drivenly connected to the motor rotor 6. The stator assembly 5 includes a stator core 51 and windings 52. When the electric pump is working, the control assembly 8 controls the current in the windings 52 of the stator assembly 5 to change according to a predetermined pattern, thereby controlling the stator assembly 5 to generate a changing excitation magnetic field. The motor rotor 6 rotates under the action of the excitation magnetic field. The motor rotor 6 can directly or indirectly drive the pump rotor 4 to rotate. In this embodiment, the shaft 7 is drivenly connected to the pump rotor 4 and the motor rotor 6. Specifically, one side of the shaft 7 is drivenly connected to the second rotor 42, and the other side of the shaft 7 is drivenly connected to the motor rotor 6. The motor rotor 6 drives the second rotor 42 to rotate through the shaft 7, thereby realizing the rotation of the pump rotor 4. The first rotor 41 is located on the outer periphery of the second rotor 42, and the first rotor 41 and the second rotor 42 are internally meshed. In other embodiments, the first rotor 41 and the second rotor 42 can also be externally meshed, in which case the first rotor 41 and the second rotor 42 are arranged side by side. In this embodiment, the central axis of the first rotor 41 is offset from the central axis of the second rotor 42. That is, there is a certain eccentricity between the central axis of the first rotor 41 and the central axis of the second rotor 42. When the second rotor 42 rotates, at least some of the external teeth of the second rotor 42 mesh with at least some of the internal teeth of the first rotor 41, thereby enabling the second rotor 42 to drive the first rotor 41 to rotate.

[0023] The electric pump also includes a partition 3, which is fixedly connected to the motor housing 11 and to the bottom cover 12. Please refer to... Figure 1 and Figure 2 The motor housing 11 includes a first sub-housing 111 and a second sub-housing 112. The first sub-housing 111 and the second sub-housing 112 are either integral or separate structures. The first sub-housing 111 is fixedly connected to the partition 3, and the second sub-housing 112 is fixedly connected to the pump cover 14. In other embodiments, the motor housing 11 is fixedly connected to the bottom cover 12, and the partition 3 is limited or fixedly connected to the motor housing 11. The electric pump has a pump chamber 20, a motor chamber 30, and an electrical control chamber 40. The pump chamber 20 communicates with the motor chamber 30. The pump rotor 4 (or at least a portion of the pump rotor 4) is located in the pump chamber 20, and the motor rotor 6 (or at least a portion of the motor rotor 6), at least a portion of the shaft 7, and the stator assembly 5 (or at least a portion of the stator assembly 5) are located in the motor chamber 30. Figures 3 to 5The partition 3 includes a receiving portion 311, and the control component 8 is located in the receiving portion 311. The cavity wall of the electronically controlled cavity 40 includes the inner wall of the receiving portion 311, and the control component 8 is located in the electronically controlled cavity 40. In one embodiment, please refer to... Figure 1 The motor cavity 30 and the electronic control cavity 40 are not connected, which avoids the working medium from affecting the control component 8. In another embodiment, please refer to... Figure 2 The motor cavity 30 and the electronic control cavity 40 are connected, and the working medium can dissipate heat from the control component 8.

[0024] Please refer to Figures 3 to 12 The partition 3 includes a body 31 and a connector 32. The connector 32 extends from the body 31 in a direction away from the bottom cover 12. The body 31 includes a receiving portion 311 and a socket 312. The connector 32 has a connector hole 321 that communicates with the socket 312. At least a portion of the control component 8 is located in the receiving portion 311. The electric pump includes a connector 2, at least a portion of which is located in the socket 312. The control component 8 includes a circuit board 81. The connector 2 is electrically connected to the circuit board 81. In the axial direction of the electric pump, the circuit board 81 is closer to the bottom cover 12 relative to the bottom wall 3121 of the socket 312. The maximum axial distance from the connector 32 to the circuit board 81 is small, which is beneficial for reducing the axial height of the electric pump.

[0025] Please refer to Figure 3 and Figure 12 The connector 2 includes a first part 21, a second part 22, and a third part 23. The separator 3 is an injection-molded part. The third part 23 is embedded in the body part 31 and connects to the first part 21 and the second part 22. The first part 21 is located in the receiving part 311 and is electrically connected to the circuit board 81. The second part 22 is located in the slot 312 and can be connected to an external power source. In the radial direction of the electric pump, the first part 21 is closer to the axis Q of the electric pump relative to the second part 22. The connector 2 can be bent to a certain extent, so that the maximum axial distance from the connector part 32 to the circuit board 81 is smaller, which is beneficial to reducing the axial height of the electric pump. The shape of the connector 2 can be, for example, U-shaped or inverted U-shaped. The third part 23 includes a first section 231 and a second section 232. The first section 231 connects to the first part 21, and the second section 232 connects to the second part 22. Along the axial direction of the electric pump, for the same length, the surface area of ​​the first section 231 is larger than that of the second section 232. This allows the connector 2 to have a larger contact area with the body part 31, which is beneficial for improving the fixing strength of the connector 2. Furthermore, since the first part 21 is fixedly connected or limited to the circuit board 81, the larger surface area of ​​the first section 231 connected to the first part 21 allows it to withstand the pressing force when pressing the circuit board 81, thereby improving the yield rate of the circuit board 81 pressing process. Figure 12As shown, the first part 231 increases the contact area with the main body 31 by providing multiple grooves.

[0026] Please refer to Figures 3 to 9 The body portion 31 has a first end face 313, and the insertion portion 32 extends from the first end face 313 in a direction away from the bottom cover 12. The body portion 31 is fixedly connected to the bottom cover 12. Specifically, the body portion 31 includes a stepped portion 314, which has a bottom wall 3141 and a side wall 3142. The side wall 3142 extends from the first end face 313 in a direction close to the circuit board 81, and the bottom wall 3141 extends from the side wall 3142 in a direction close to the axis Q of the electric pump. The bottom wall 3141 is fixedly connected to the bottom cover 12. In the axial direction of the electric pump, the maximum distance L1 between the bottom cover 12 and the circuit board 81 is less than or equal to the maximum distance L2 between the first end face 313 and the circuit board 81. On the one hand, in the axial direction of the electric pump, the bottom cover 12 can be close to the circuit board 81 relative to the insertion portion 32, which is beneficial to reduce the axial height of the electric pump. On the other hand, it can reduce the material used in the bottom cover 12.

[0027] Please refer to Figures 3 to 9 The electric pump includes at least three winding electrical connection portions 9. In this embodiment, the electric pump includes a first-phase winding electrical connection portion, a second-phase winding electrical connection portion, and a third-phase winding electrical connection portion. Currently, the holes on the circuit board that mate with the winding electrical connection portions are usually located on one side of the circuit board. During the press-fitting of the circuit board, one side of the circuit board is subjected to force, while the other side is not subjected to force. The circuit board is prone to damage due to uneven force. In order to improve the yield rate of the circuit board press-fitting process, it is generally necessary to set support structures on some components. To solve this problem, the inner sidewall of the receiving portion 311 includes a first inner sidewall 3113 and a second inner sidewall 3114. The winding electrical connection portions 9 are arranged at intervals along the extending direction of the second inner sidewall 3114. In the radial direction of the electric pump, the first inner sidewall 3113 extends to the electric pump. The shortest distance of axis Q is less than the shortest distance from the second inner sidewall 3114 to the axis Q of the electric pump. The connector 2 is close to the first inner sidewall 3113 relative to at least one winding electrical connection 9. When pressing the circuit board 81, the winding electrical connection 9 and the connector 2 are connected to the circuit board 81 at the same time. The winding electrical connection 9 is connected to the circuit board 81 first. Since the holes on the circuit board 81 for installing the connector 2 and the winding electrical connection 9 are located on different sides of the circuit board 81, the circuit board 81 can be subjected to uniform force when pressing the circuit board 81, and the partition 3 does not need to be provided with an additional support structure.

[0028] Please refer to Figure 6 and Figure 7The winding electrical connection part 9 includes a first electrical connection part 91, a fixing part 92, and a second electrical connection part 93. The first electrical connection part 91 is disposed on one side of the fixing part 92, and the second electrical connection part 93 is disposed on the other side of the fixing part 92. The first electrical connection part 91 is electrically connected to the stator assembly 5, and the second electrical connection part 93 is electrically connected to the circuit board 81. The partition part 3 is an injection molded part, and the fixing part 92 is embedded in the body part 31. The partition part 3 can be formed by injection molding the winding electrical connection part 9 and the connector 2 as inserts. Compared with forming two parts by injection molding the winding electrical connection part 9 and the connector 2 as separate inserts, it is beneficial to simplify the process.

[0029] Please refer to section 3. Figure 11 The bottom wall of the receiving part 311 includes a first wall 3111 and a second wall 3112. The second electrical connection part 93 protrudes from the first wall 3111, and the first part 21 protrudes from the second wall 3112. In the axial direction of the electric pump, the second wall 3112 is closer to the circuit board 81 than the first wall 3111. On the one hand, the body part 31 and the connector 2 have a large contact area, which can have good support strength and withstand the pressing force when pressing the circuit board 81. On the other hand, it is flat relative to the bottom wall, which can reduce the material used for the partition.

[0030] In one embodiment, please refer to Figure 1 , Figure 3 , Figure 4 and Figures 6 to 10 The main body 31 includes a receiving groove 317, which is recessed from the second wall 3112 in a direction away from the circuit board 81. The control assembly 8 includes an electronic component 82, which is fixedly connected to the circuit board 81. The electronic component 82 includes a first electronic component 821 and a second electronic component 822. In the axial direction of the electric pump, the height of any first electronic component 821 is greater than the height of any second electronic component 822. The height of the first electronic component 821 is less than the length of the winding electrical connection portion 9. At least a portion of the first electronic component 821 is located in the receiving groove 317. The first electronic component 821 includes, for example, an electrical... The second electronic component 822 includes, for example, a surface-mount chip. The first electronic component 821 is located closer to the working medium within the motor cavity 30, resulting in a shorter heat transfer distance and allowing the working medium within the motor cavity 30 to quickly absorb the heat generated by the first electronic component 821. Furthermore, the taller first electronic component 821 is located in the receiving groove 317, facing the stator assembly 5. Compared to the first electronic component facing the bottom cover, the distance from the first surface of the circuit board to the bottom cover is shorter. Additionally, in the axial direction of the electric pump, the height of the first electronic component 821 is less than the length of the winding electrical connection portion 9, which helps to reduce the axial height of the electric pump. Please refer to... Figure 4The main body 31 includes a groove 316 and has a second end face 315. The groove 316 is recessed from the second end face 315 toward the circuit board 81. In the axial direction of the electric pump, the distance L3 from the bottom wall of the groove 316 to the second wall 3112 is greater than or equal to the distance L4 from the second end face 315 to the bottom wall of the receiving groove 317. On the one hand, this can reduce the material used in the partition 3; on the other hand, the heat transfer distance of the electronic component 82 can be shorter, which is beneficial for the working medium in the motor cavity 30 to absorb the heat generated by the electronic component 82 more quickly.

[0031] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 5 The main body 31 has a through hole 318, and the hole wall forming the through hole 318 extends from the second wall 3112 in a direction away from the circuit board 81. The control component 8 includes an electronic component 82, which is fixedly connected to the circuit board 81. At least a portion of the electronic component 82 is located in the through hole 318. The motor cavity 30 is connected to the through hole 318, and the through hole 318 is connected to the electronic control cavity 40. On the one hand, the working medium of the motor cavity 30 can flow into the electronic control cavity 40 through the through hole 318, and the working medium can dissipate heat from the control component 8 located in the electronic control cavity 40. On the other hand, it can reduce the amount of material used in the partition 3.

[0032] The circuit board 81 is fixed to the connector 2 by welding. The welding process is mature and relatively simple. Alternatively, the circuit board 81 has a mounting hole 811. The connector 2 is an interference fit with the wall corresponding to the mounting hole 811. The connector 2 is a press-fit terminal and the mounting hole 811 is a plug-in hole. The press-fit terminal is an interference fit with the wall corresponding to the plug-in hole. Soldering is not required and the process is simple.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and controls without departing from the concept of this application, and these modifications and controls all fall within the protection scope of this application.

Claims

1. An electric pump, characterized in that, The electric pump includes a bottom cover (12), a partition (3), a connector (2), and a control component (8). The bottom cover (12) is fixedly connected to the partition (3). The partition (3) includes a body (31) and a connector (32). The body (31) includes a receiving portion (311) and a socket (312). At least a portion of the control component (8) is located in the receiving portion (311), and at least a portion of the connector (2) is located in the socket (312). The connector (32) has a connector hole (321) that communicates with the socket (312). The control component (8) includes a circuit board (81). The connector (2) is electrically connected to the circuit board (81). In the axial direction of the electric pump, the circuit board (81) is close to the bottom cover (12) relative to the bottom wall (3121) of the socket (312).

2. The electric pump according to claim 1, characterized in that, The connector (2) includes a first part (21), a second part (22) and a third part (23). The third part (23) is embedded in the body part (31). The third part (23) is connected to the first part (21) and the third part (23) is connected to the second part (22). The first part (21) is located in the receiving part (311) and is electrically connected to the circuit board (81). The second part (22) is located in the slot (312). In the radial direction of the electric pump, the first part (21) is closer to the axis (Q) of the electric pump relative to the second part (22).

3. The electric pump according to claim 2, characterized in that, The third part (23) includes a first part (231) and a second part (232). The first part (231) is connected to the first part (21), and the second part (232) is connected to the second part (22). In the axial direction of the electric pump, under the same length, the surface area of ​​the first part (231) is greater than the surface area of ​​the second part (232).

4. The electric pump according to any one of claims 1-3, characterized in that, The body part (31) has a first end face (313), and the connector (32) extends from the first end face (313) in a direction away from the bottom cover (12). The body part (31) is fixedly connected to the bottom cover (12). In the axial direction of the electric pump, the maximum distance (L1) from the bottom cover (12) to the circuit board (81) is less than or equal to the maximum distance (L2) from the first end face (313) to the circuit board (81).

5. The electric pump according to any one of claims 1-3, characterized in that, The electric pump includes at least three winding electrical connections (9), and the inner wall of the receiving portion (311) includes a first inner wall (3113) and a second inner wall (3114). The winding electrical connections (9) are spaced apart along the extending direction of the second inner wall (3114). In the radial direction of the electric pump, the shortest distance from the first inner wall (3113) to the axis (Q) of the electric pump is less than the shortest distance from the second inner wall (3114) to the axis (Q) of the electric pump. The connector (2) is close to the first inner wall (3113) relative to at least one of the winding electrical connections (9).

6. The electric pump according to any one of claims 4, characterized in that, The electric pump includes at least three winding electrical connections (9), and the inner wall of the receiving portion (311) includes a first inner wall (3113) and a second inner wall (3114). The winding electrical connections (9) are spaced apart along the extending direction of the second inner wall (3114). In the radial direction of the electric pump, the shortest distance from the first inner wall (3113) to the axis (Q) of the electric pump is less than the shortest distance from the second inner wall (3114) to the axis (Q) of the electric pump. The connector (2) is close to the first inner wall (3113) relative to at least one of the winding electrical connections (9).

7. The electric pump according to claim 6, characterized in that, The winding electrical connection part (9) includes a first electrical connection part (91), a fixing part (92), and a second electrical connection part (93). The first electrical connection part (91) is disposed on one side of the fixing part (92), and the second electrical connection part (93) is disposed on the other side of the fixing part (92). The electric pump includes a stator assembly (5). The first electrical connection part (91) is electrically connected to the stator assembly (5), and the second electrical connection part (93) is electrically connected to the circuit board (81). The partition part (3) is an injection molded part, and the fixing part (92) is embedded in the body part (31).

8. The electric pump according to claim 7, characterized in that, The bottom wall of the receiving part (311) includes a first wall (3111) and a second wall (3112), the second electrical connection part (93) protrudes from the first wall (3111), the connector (2) includes a first part (21), the first part (21) protrudes from the second wall (3112), and in the axial direction of the electric pump, the second wall (3112) is close to the circuit board (81) relative to the first wall (3111).

9. The electric pump according to claim 8, characterized in that, The body portion (31) includes a receiving groove (317) recessed from the second wall (3112) toward the direction away from the circuit board (81). The control component (8) includes an electronic component (82) fixedly connected to the circuit board (81). The electronic component (82) includes a first electronic component (821) and a second electronic component (822). At least a portion of the first electronic component (821) is located in the receiving groove (317). In the axial direction of the electric pump, the height of any one of the first electronic components (821) is greater than the height of any one of the second electronic components (822), and the height of the first electronic component (821) is less than the length of the winding electrical connection portion (9).

10. The electric pump according to claim 9, characterized in that, The body portion (31) includes a groove (316) and has a second end face (315). The groove (316) is recessed from the second end face (315) toward the circuit board (81). In the axial direction of the electric pump, the distance (L3) from the bottom wall of the groove (316) to the second wall (3112) is greater than or equal to the distance (L4) from the second end face (315) to the bottom wall of the receiving groove (317).

11. The electric pump according to claim 8, characterized in that, The body portion (31) includes a groove (316) and has a second end face (315). The groove (316) is recessed from the second end face (315) toward the circuit board (81). The body portion (31) includes a receiving groove (317) which is recessed from the second wall (3112) toward the direction away from the circuit board (81). In the axial direction of the electric pump, the distance (L3) from the bottom wall of the groove (316) to the second wall (3112) is greater than or equal to the distance (L4) from the second end face (315) to the bottom wall of the receiving groove (317).

12. The electric pump according to claim 8, characterized in that, The body portion (31) has a through hole (318), the hole wall forming the through hole (318) extends from the second wall (3112) in a direction away from the circuit board (81), the control component (8) includes electronic components (82), at least a portion of the electronic components (82) are located in the through hole (318), the electric pump includes a motor cavity (30) and an electronic control cavity (40), the stator assembly (5) is located in the motor cavity (30), at least a portion of the control component (8) is located in the electronic control cavity (40), the motor cavity (30) and the through hole (318) are connected, and the through hole (318) is connected to the electronic control cavity (40).

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