Parking lock system pawl position detection structure

Abstract

The application provides a parking lock system pawl position detection structure, which comprises a gearbox shell, a parking lock pawl and a position sensing device. The parking lock pawl is movably arranged on the gearbox shell, and a coupling metal part is arranged on the parking lock pawl. The position sensing device comprises a shell main body, a PCB, an eddy current sensing coil and an eddy current signal processing chip. The PCB is arranged in the shell main body, the eddy current sensing coil and the eddy current signal processing chip are arranged on the PCB, the eddy current sensing coil is electrically connected with the eddy current signal processing chip, the eddy current sensing coil is used for generating an alternating magnetic field and receiving a coupling voltage of the parking lock pawl in the alternating magnetic field, the coupling metal part is used for generating an eddy current under the action of the alternating magnetic field of the eddy current sensing coil, and the eddy current signal processing chip is used for processing the coupling voltage and calculating the position of the parking lock pawl. The application can effectively eliminate the restriction of the material properties of the parking lock pawl on the measurement accuracy, and simultaneously reduce the cost.

Description

Technical Field

[0001] This invention relates to the field of parking lock system technology, and in particular to a parking lock system pawl position detection structure. Background Technology

[0002] The parking lock system is a critical safety structure in a vehicle's transmission system. It achieves parking lock and unlock functions through the engagement and disengagement of the locking claws. Accurate claw position detection is a core prerequisite for ensuring the stable and safe operation of the parking system, directly determining the accuracy of the vehicle's parking status assessment and driving safety. Currently, most parking lock system claw position detection structures in the industry use Hall effect sensors, employing a combination of Hall chips and back magnets to identify the claw position. This Hall effect detection principle has strict limitations regarding the material of the object being detected; it can only effectively detect claws made of magnetically conductive metal. If the metal material of the claw itself has a magnetic field, it will directly interfere with the Hall chip's sensing signal, significantly reducing position detection accuracy. Furthermore, the Hall effect detection structure has poor environmental adaptability. Significant fluctuations in ambient temperature during vehicle operation and strong magnetic field interference from surrounding electrical equipment can affect the accuracy of claw position detection, easily leading to misjudgments and missed detections of the parking status, resulting in insufficient reliability.

[0003] There are also parking lock system claw position detection structures on the market that use mechanical switch detection solutions. This structure has a simple principle, relying on mechanical contact trigger signals to determine the position, without the need for inductive magnetic field signals, thus avoiding the influence of material magnetic fields and external electromagnetic interference. However, this structure has significant durability defects. The mechanical switch is a physically contact-based vulnerable component, which will continuously experience mechanical wear and fatigue aging during long-term vehicle use, requiring regular disassembly, inspection, maintenance, and replacement, resulting in high maintenance costs in the later stages.

[0004] Therefore, there is an urgent need to develop and provide a parking lock claw position detection structure that can effectively eliminate the limitations of parking lock claw material properties on measurement accuracy, significantly reduce the impact of environmental factors such as temperature and electromagnetic fields on the detection results, ensure the accuracy and reliability of lock claw position detection, broaden the applicable working conditions and environmental range of the parking lock detection structure, and reduce costs. Summary of the Invention

[0005] The purpose of this invention is to provide a parking lock claw position detection structure, which can effectively eliminate the limitation of parking lock claw material properties on measurement accuracy, significantly reduce the influence of environmental factors such as temperature and electromagnetic fields on the detection results, ensure the accuracy and reliability of lock claw position detection, broaden the applicable working conditions and environmental range of the parking lock detection structure, and reduce costs.

[0006] To achieve the above objectives, the present invention provides a parking lock system pawl position detection structure, including a gearbox housing, a parking lock pawl, and a position sensing device. The parking lock pawl is movably disposed on the gearbox housing and has a coupling metal part. The position sensing device includes a housing body, a PCB board, an eddy current induction coil, and an eddy current signal processing chip. The housing body is disposed on the gearbox housing, and the PCB board is disposed inside the housing body. The eddy current induction coil and the eddy current signal processing chip are respectively disposed on the PCB board. The eddy current induction coil and the eddy current signal processing chip are electrically connected. The eddy current induction coil is used to generate an alternating magnetic field and receive the coupling voltage of the parking lock pawl in the alternating magnetic field. The eddy current signal processing chip is used to process the coupling voltage and calculate the position of the parking lock pawl.

[0007] Preferably, an induction surface is formed on the outer side of the outer casing at a position corresponding to the eddy current induction coil, and the induction surface is directly opposite to and adjacent to the coupling metal portion.

[0008] Preferably, one end of the parking lock claw is rotatably connected to the gearbox housing, and the coupling metal part protrudes from the other end of the parking lock claw. Preferably, the parking lock system pawl position detection structure further includes a locking gear, which is rotatably connected to the gearbox housing. The parking lock pawl is also provided with a gear meshing part that is spaced apart from the coupling metal part, and the gear meshing part meshes with the locking gear. Preferably, the locking gear has a plurality of engagement slots along its circumferential direction, and the parking lock pawl has a P position, a T / T position, and an NP position; when the parking lock pawl is in the P position, the gear engagement part is fully engaged in the engagement slot; when the parking lock pawl is in the T / T position, the gear engagement part is partially engaged in the engagement slot; when the parking lock pawl is in the NP position, the gear engagement part is completely disengaged from the engagement slot. Preferably, the eddy current induction coil includes a transmitting coil and a receiving coil, the receiving coil being located inside the transmitting coil, the transmitting coil being used to pass in an AC signal and generate the alternating magnetic field, and the receiving coil being used to receive the coupled voltage. Preferably, the receiving coil includes a first receiving coil and a second receiving coil, both of which have periodic waveform shapes, and the phase of the second receiving coil is offset by 90° relative to the phase of the first receiving coil. Preferably, the position sensing device further includes a connector, the housing body has an accommodating space inside, one end of the housing body has an opening communicating with the accommodating space, the PCB board is disposed in the accommodating space, the connector is connected to the housing body and seals the opening, the connector has a PIN pin inside, the PIN pin is inserted into the accommodating space and connected to the PCB board. Preferably, the position sensing device further includes a sealing plug, and the connector is provided with a leak detection process hole communicating with the accommodating space. The sealing plug is inserted into the leak detection process hole and seals the leak detection process hole. Preferably, the gearbox housing has an installation space inside, the other end of the outer casing body passes through the installation space, and the sensing surface is disposed on the end of the outer casing body that passes through the installation space. Preferably, the position sensing device further includes a sealing ring, which is sleeved on the outer side wall of the housing body and sealed between the housing body and the gearbox housing. Compared with existing technologies, the parking lock system claw position detection structure of this invention adopts the eddy current induction detection principle instead of the traditional Hall effect sensing principle and mechanical contact detection method. It relies on the eddy current induction coil to generate an alternating magnetic field, causing eddy currents to be generated in the coupled metal part on the parking lock claw. The eddy current induction coil simultaneously receives the coupling voltage of the parking lock claw in the alternating magnetic field. The coupling voltage of the eddy current induction coil is processed by the eddy current signal processing chip to calculate the position of the parking lock claw. Its detection principle relies only on the eddy current effect of the metal conductor, without relying on the magnetic properties of the lock claw, and is not affected by the magnetism of the parking lock claw itself. It effectively eliminates the limitation of the parking lock claw material properties on the measurement accuracy, greatly relaxes the material selection requirements of the parking lock claw, and does not require special restrictions on the magnetism and magnetic permeability of the parking lock claw, effectively reducing the production and material selection costs of the parking lock claw. Secondly, the position sensing device of this invention has stronger overall resistance to environmental interference. The eddy current detection system, composed of an eddy current induction coil and an eddy current signal processing chip, is insensitive to ambient temperature fluctuations and strong magnetic field interference generated by electrical equipment around the vehicle. This significantly reduces the impact of environmental factors such as temperature and electromagnetic fields on the detection results. It can continuously and stably collect detection signals in complex and ever-changing vehicle operating conditions, accurately determine the actual position of the parking lock claw, ensure the accuracy and reliability of the lock claw position detection, expand the applicable scenarios, and facilitate widespread use. Furthermore, since this invention relies entirely on non-contact eddy current induction to complete position detection, there is no mechanical contact wear, eliminating the need for regular inspection and replacement of parts, significantly reducing the workload and cost of later equipment maintenance. Attached Figure Description

[0009] Figure 1This is a structural diagram of the parking lock system claw position detection structure of the present invention when the parking lock claw is in the P position.

[0010] Figure 2 This is a structural diagram of the parking lock system claw position detection structure of the present invention when the parking lock claw is in the T / T gear position.

[0011] Figure 3 This is a structural diagram of the parking lock system claw position detection structure of the present invention when the parking lock claw is in the NP position.

[0012] Figure 4 This is a three-dimensional structural diagram of the position sensing device of the present invention.

[0013] Figure 5 This is a cross-sectional view of the position sensing device of the present invention.

[0014] Figure 6 This is an exploded view of the position sensing device of the present invention.

[0015] Figure 7 This is a schematic diagram of the parking lock system claw position detection structure of the present invention.

[0016] Figure 8 This is a structural diagram of the eddy current induction coil on the PCB board of the present invention. Detailed Implementation

[0017] To illustrate the technical content, structural features, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0018] Please see Figures 1 to 7The parking lock system pawl position detection structure 100 of the present invention includes a gearbox housing 1, a parking lock pawl 2, and a position sensing device 3. The parking lock pawl 2 is movably disposed on the gearbox housing 1 and has a coupling metal part 21. The position sensing device 3 includes a housing body 31, a PCB board 32, an eddy current induction coil 33, and an eddy current signal processing chip 34. The housing body 31 is disposed on the gearbox housing 1, the PCB board 32 is disposed inside the housing body 31, the eddy current induction coil 33 and the eddy current signal processing chip 34 are respectively disposed on the PCB board 32, the eddy current induction coil 33 and the eddy current signal processing chip 34 are electrically connected, the eddy current induction coil 33 is used to generate an alternating magnetic field and receive the coupling voltage of the parking lock pawl 2 in the alternating magnetic field, and the eddy current signal processing chip 34 is used to process the coupling voltage and calculate the position of the parking lock pawl 2. This invention employs the non-contact eddy current detection principle, overcoming the inherent defects of traditional Hall effect detection and mechanical switch detection. By generating an alternating magnetic field through an eddy current induction coil 33, eddy currents are induced in the coupling metal part 21 on the parking lock claw 2. Simultaneously, the eddy current induction coil 33 receives the coupling voltage of the parking lock claw 2 in the alternating magnetic field. The coupling voltage of the eddy current induction coil 33 is processed by the eddy current signal processing chip 34 to calculate the position of the parking lock claw 2. This method does not rely on the magnetic properties of the lock claw and is not affected by the magnetism of the parking lock claw 2 itself, effectively eliminating the limitation of the material properties of the parking lock claw 2 on the measurement accuracy.

[0019] Specifically, in one embodiment, an induction surface 311 is formed on the outer side of the housing body 31 at a position corresponding to the eddy current induction coil 33, and the induction surface 311 is directly opposite to and adjacent to the coupling metal part 21.

[0020] Please see Figures 1 to 3 In one embodiment, one end of the parking lock claw 2 is rotatably connected to the gearbox housing 1, and the coupling metal part 21 protrudes from the other end of the parking lock claw 2. The parking lock claw 2 can rotate on the gearbox housing 1 by relying on the end connection structure to realize the reciprocating action of locking and unlocking. At the same time, the protruding arrangement of the coupling metal part 21 can ensure that the coupling metal part 21 and the sensing surface 311 of the position sensing device 3 form a stable and corresponding sensing distance, avoiding the occurrence of sensing blind spots during the rotation of the parking lock claw 2, and ensuring the continuity and stability of position sensing.

[0021] Please see Figures 1 to 3In one embodiment, the parking lock system pawl position detection structure 100 further includes a locking gear 4, which is rotatably connected to the gearbox housing 1. The parking lock pawl 2 is also provided with a gear meshing part 22, which is separated from the coupling metal part 21 and meshes with the locking gear 4. The coupling metal part 21 is the end of the parking lock pawl 2, not the gear meshing part 22, in order to obtain a more stable detection signal. The gear meshing part 22 is a stress-bearing area, which will wear and plastic deformation under high stress and high frequency impact for a long time, affecting the stability of the signal. On the other hand, the end of the parking lock pawl 2 is a non-stress-bearing area and hardly bears any impact or load. During long-term use, the coupling metal part 21 can maintain its shape, making the position detection signal more stable.

[0022] Specifically, in one embodiment, the locking gear 4 is provided with a plurality of engagement slots 41 along its circumferential direction, and the parking lock pawl 2 has a P position, a T / T position, and an NP position; when the parking lock pawl 2 is in the P position, the gear engagement part 22 is fully engaged in the engagement slots 41; when the parking lock pawl 2 is in the T / T position, the gear engagement part 22 is partially engaged in the engagement slots 41; when the parking lock pawl 2 is in the NP position, the gear engagement part 22 is completely disengaged from the engagement slots 41. Wherein, as... Figure 1 As shown, the parking lock pawl 2 is in the P position, and the gear engagement part 22 is fully engaged in the engagement groove 41; as Figure 2 As shown, the parking lock pawl 2 is in the T / T gear position, and the gear meshing part 22 is partially engaged in the meshing groove 41; as Figure 3 As shown, the parking lock pawl 2 is in the NP position, and the gear engagement part 22 is completely disengaged from the engagement slot 41. The specific working states corresponding to the P, T / T, and NP positions are well known to those skilled in the art and will not be described in detail here.

[0023] Please see Figure 7 and Figure 8 In one embodiment, the eddy current induction coil 33 includes a transmitting coil 331 and a receiving coil 332. The receiving coil 332 is located within the transmitting coil 331. The transmitting coil 331 is used to transmit an AC signal and generate an alternating magnetic field, while the receiving coil 332 is used to receive the coupled voltage. This nested arrangement of the transmitting coil 331 and the receiving coil 332 significantly improves the integration of the coil structure, reduces the overall space occupied by the PCB board 32, and ensures a high degree of matching between the radiation range of the alternating magnetic field and the signal reception range of the receiving coil 332. This effectively improves the magnetic field coupling efficiency and ensures the stability and integrity of the voltage signal reception.

[0024] Specifically, in one embodiment, the receiving coil 332 includes a first receiving coil 332a and a second receiving coil 332b. Both the first receiving coil 332a and the second receiving coil 332b have periodic waveform shapes, and the phase of the second receiving coil 332b is offset by 90° relative to the phase of the first receiving coil 332a. Since both the first receiving coil 332a and the second receiving coil 332b have periodic waveform shapes, and the phase of the second receiving coil 332b is offset by 90° relative to the phase of the first receiving coil 332a, the combination of coupling signals obtained by the first receiving coil 332a and the second receiving coil 332b is unique. The position information of the parking lock claw 2 can be deduced by calculating the two sets of signals, ensuring the accuracy of the parking lock claw 2 position detection. More specifically, the first receiving coil 332a is arranged on the PCB board 32 along the direction of a sine curve, and the second receiving coil 332b is arranged on the PCB board 32 along the direction of a cosine curve, but this is not a limitation.

[0025] Specifically, in one embodiment, the position sensing device 3 further includes a power supply filtering unit 38, which is disposed on the PCB board 32 and electrically connected to the eddy current signal processing chip 34. The power supply filtering unit 38 is used to filter out interference signals on the power line. The power supply filtering unit 38 can effectively filter out invalid signals such as noise and pulse interference in the vehicle power system, providing a clean and stable power supply for the eddy current induction coil 33 and the eddy current signal processing chip 34, further improving the anti-interference capability and operational stability of the overall detection structure.

[0026] Please see Figures 4 to 6 In one embodiment, the position sensing device 3 further includes a connector 35. The housing body 31 has an internal accommodating space 312, and one end of the housing body 31 has an opening 313 communicating with the accommodating space 312. The PCB board 32 is disposed within the accommodating space 312. The connector 35 connects to the housing body 31 and seals the opening 313. The connector 35 contains a pin 351, which is inserted into the accommodating space 312 and connected to the PCB board 32. The accommodating space 312 of the housing body 31 provides enclosed protection for core electrical components such as the PCB board 32, coils, and chips. The connector 35 sealing the opening 313 prevents external dust, oil, and moisture from entering the interior. Simultaneously, the built-in pin 351 enables stable electrical connection between the PCB board 32 and the external vehicle control system, completing the transmission of signals and power.

[0027] Please see Figures 4 to 6In one embodiment, the position sensing device 3 further includes a sealing plug 36. The connector 35 is provided with a leak detection process hole 352 communicating with the accommodating space 312. The sealing plug 36 is inserted into the leak detection process hole 352 and seals the leak detection process hole 352. The leak detection process hole 352 can meet the airtightness testing requirements during the product manufacturing and assembly process, ensuring that the sealing performance of the internal accommodating space 312 meets the standards. After the test is completed, the hole is sealed by the sealing plug 36, which can maintain the sealed environment inside the outer shell 31 for a long time, prevent external impurities and moisture from entering, protect the internal precision electrical components, and extend the service life of the equipment.

[0028] Please see Figures 3 to 6 In one embodiment, the gearbox housing 1 has an installation space 11 inside, the other end of the housing body 31 passes through the installation space 11, and the sensing surface 311 is disposed on the end of the housing body 31 that passes through the installation space 11.

[0029] Specifically, in one embodiment, the gearbox housing 1 is provided with a mounting hole that communicates with the mounting space 11, and the housing body 31 passes through the mounting hole and is inserted into the mounting space 11.

[0030] Specifically, in one embodiment, a nut 314 is embedded inside the outer casing 31, and a bolt passes through the nut 314 and connects it to the gearbox housing 1, thereby fixing the outer casing 31 and the gearbox housing 1 together. However, this is not a limitation.

[0031] Please see Figures 4 to 6 In one embodiment, the position sensing device 3 further includes a sealing ring 37, which is sleeved on the outer side wall of the housing body 31 and sealed between the housing body 31 and the gearbox housing 1. The sealing ring 37 can fill the assembly gap between the mounting holes of the housing body 31 and the gearbox housing 1, achieving radial all-round sealing protection and effectively preventing the leakage and intrusion of lubricating oil, water vapor, and impurities inside the gearbox.

[0032] The specific working principle of the parking lock system pawl position detection structure 100 of the present invention is as follows: During operation, the external vehicle power supply is filtered and regulated by the power filter unit 38 to supply power to the electrical components on the PCB board 32. After an AC signal is applied to the transmitting coil 331 of the eddy current induction coil 33, a stable alternating magnetic field is generated. The alternating magnetic field radiates to the coupling metal part 21 of the parking lock claw 2, causing the coupling metal part 21 to generate corresponding eddy currents based on the eddy current effect. The eddy currents will form an induced magnetic field in the opposite direction, thereby changing the coupling voltage of the eddy current induction coil 33. The receiving coil 332 collects the changed coupling voltage in real time and transmits it to the eddy current signal processing chip 34. The eddy current signal processing chip 34 amplifies, filters, and processes the collected coupling voltage signal, and accurately calculates the real-time position of the coupling metal part 21 by combining the change in voltage signal. Based on this, it determines whether the parking lock claw 2 is in the P position, T / T position, or NP position, and finally completes the real-time and accurate detection of the position of the parking lock claw 2, and stably outputs the accurate parking lock claw 2 position detection signal.

[0033] Compared with the prior art, the parking lock system claw position detection structure 100 of the present invention adopts the eddy current induction detection principle to replace the traditional Hall induction principle and mechanical contact detection method. It relies on the eddy current induction coil 33 to generate an alternating magnetic field, which causes the coupling metal part 21 on the parking lock claw 2 to generate eddy currents. The eddy current induction coil 33 simultaneously receives the coupling voltage of the parking lock claw 2 in the alternating magnetic field. The coupling voltage of the eddy current induction coil 33 is processed by the eddy current signal processing chip 34 to calculate the position of the parking lock claw 2. Its detection principle relies only on the eddy current effect of the metal conductor, without relying on the magnetic properties of the lock claw, and is not affected by the magnetism of the parking lock claw 2 itself. It effectively eliminates the restriction of the measurement accuracy on the material properties of the parking lock claw 2, greatly relaxes the material selection requirements of the parking lock claw 2, and does not require special restrictions on the magnetism and magnetic permeability of the parking lock claw 2, effectively reducing the production and material selection costs of the parking lock claw 2. Secondly, the position sensing device 3 of this invention has stronger overall resistance to environmental interference. The eddy current detection system composed of the eddy current induction coil 33 and the eddy current signal processing chip 34 is insensitive to ambient temperature fluctuations and strong magnetic field interference generated by electrical equipment around the vehicle. This significantly reduces the impact of environmental factors such as temperature and electromagnetic fields on the detection results. It can continuously and stably collect detection signals in complex and ever-changing vehicle operating conditions, accurately determine the actual position of the parking lock claw 2, ensure the accuracy and reliability of the lock claw position detection, expand the applicable scenarios, and facilitate widespread use. Furthermore, since this invention relies entirely on non-contact eddy current induction to complete position detection, there is no mechanical contact wear, and no need for regular inspection and replacement of parts, which greatly reduces the workload and cost of later equipment maintenance.

[0034] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A parking lock system pawl position detection structure, characterized in that, include: Gearbox housing; A parking lock claw, which is movably mounted on the gearbox housing, and has a coupling metal part on it; A position sensing device includes a housing body, a PCB board, an eddy current induction coil, and an eddy current signal processing chip. The housing body is disposed on the gearbox housing, and the PCB board is disposed inside the housing body. The eddy current induction coil and the eddy current signal processing chip are respectively disposed on the PCB board. The eddy current induction coil and the eddy current signal processing chip are electrically connected. The eddy current induction coil is used to generate an alternating magnetic field and receive the coupling voltage of the parking lock claw in the alternating magnetic field. The eddy current signal processing chip is used to process the coupling voltage and calculate the position of the parking lock claw.

2. The parking lock system pawl position detection structure according to claim 1, wherein a sensing surface is formed on the outer side of the housing body at a position corresponding to the eddy current induction coil, and the sensing surface is directly opposite to and adjacent to the coupling metal part.

3. The parking lock system pawl position detection structure according to claim 1, characterized in that, One end of the parking lock claw is rotatably connected to the gearbox housing, and the coupling metal part protrudes from the other end of the parking lock claw.

4. The parking lock system pawl position detection structure according to claim 1, characterized in that, It also includes a locking gear, which is rotatably connected to the gearbox housing. The parking lock pawl is also provided with a gear meshing part that is spaced apart from the coupling metal part and meshes with the locking gear.

5. The parking lock system pawl position detection structure according to claim 4, characterized in that, The locking gear has several engagement slots along its circumferential direction, and the parking lock pawl has a P position, a T / T position, and an NP position. When the parking lock pawl is in the P position, the gear engagement part is fully engaged in the engagement slot. When the parking lock pawl is in the T / T position, the gear engagement part is partially engaged in the engagement slot. When the parking lock pawl is in the NP position, the gear engagement part is completely disengaged from the engagement slot.

6. The parking lock system pawl position detection structure according to claim 1, characterized in that, The eddy current induction coil includes a transmitting coil and a receiving coil. The receiving coil is located inside the transmitting coil. The transmitting coil is used to pass in an AC signal and generate the alternating magnetic field. The receiving coil is used to receive the coupling voltage.

7. The parking lock system pawl position detection structure according to claim 6, characterized in that, The receiving coil includes a first receiving coil and a second receiving coil. Both the first receiving coil and the second receiving coil have periodic waveform shapes, and the phase of the second receiving coil is offset by 90° relative to the phase of the first receiving coil.

8. The parking lock system pawl position detection structure according to claim 1, characterized in that, The position sensing device also includes a connector. The interior of the housing body has an accommodating space. One end of the housing body has an opening communicating with the accommodating space. The PCB board is disposed in the accommodating space. The connector is connected to the housing body and seals the opening. The connector has a PIN pin, which is inserted into the accommodating space and connected to the PCB board.

9. The parking lock system pawl position detection structure according to claim 8, characterized in that, The position sensing device further includes a sealing plug, and the connector is provided with a leak detection process hole communicating with the accommodating space. The sealing plug is inserted into the leak detection process hole and seals the leak detection process hole.

10. The parking lock system pawl position detection structure according to claim 8, characterized in that, The gearbox housing has an internal installation space, and the other end of the outer shell body passes through the installation space. The sensing surface is disposed on the end of the outer shell body that passes through the installation space.

11. The parking lock system pawl position detection structure according to claim 10, characterized in that, The position sensing device also includes a sealing ring, which is sleeved on the outer side wall of the housing body and sealed between the housing body and the gearbox housing.

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