Electric automobile tail door actuator spring and tail door actuator thereof

Abstract

The invention relates to an electric automobile tail door actuator spring and a tail door actuator thereof. The actuator spring comprises a spiral spring body, the spiral spring body comprises a first reset spring section and a second reset spring section, the first reset spring section and the second reset spring section can be quickly bounced off, and the two spring sections are fixedly connected and can provide different reset forces. The electric automobile tail door actuator comprises a spring body, an outer sleeve and a telescopic rod, the telescopic rod is connected with a driving motor through a lead screw, and the lead screw is driven by a reduction gear set. The spring body is located in the telescopic rod, the first reset spring section abuts against the baffle in the outer sleeve, the second reset spring section abuts against the telescopic rod, the electric heating wire heats the first reset spring section through the fixing groove body, and the elastic recovery capacity of the first reset spring section is enhanced. Through the design of two sections of reset springs and an electric heating auxiliary reset mechanism, the problems that in the prior art, in the tail door opening and closing process, the motor load is too large, the spring effect is limited, the motor is overloaded, and the service life of an actuator is shortened are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle tailgate actuators, and in particular to an electric vehicle tailgate actuator spring and a tailgate actuator thereof. Background Art

[0002] As one of the important components of electric vehicles, the electric car tailgate actuator is mainly used to realize the automatic opening and closing of the tailgate. With the improvement of automobile intelligence and user experience requirements, more and more cars are equipped with electric tailgate systems, allowing users to easily control the opening and closing of the tailgate through buttons or sensing devices. The core function of the electric tailgate actuator is to accurately control the movement trajectory of the tailgate while ensuring the stability and safety of the operation. Therefore, in the design of the actuator, not only the driving force of the motor should be considered, but also the weight of the tailgate should be balanced to reduce the burden on the motor and extend the service life of the system.

[0003] However, in the operation process, the electric vehicle tailgate actuator in the prior art often needs to directly bear the entire weight of the tailgate, especially in the initial stage of opening and the final stage of closing the tailgate, the motor needs to output a large force to overcome the weight of the tailgate, which makes the motor overloaded. In order to alleviate this problem, the prior art usually adds an auxiliary spring inside the actuator, and uses the spring's rebound force to reduce the working pressure of the motor. However, the current spring design has certain limitations, the auxiliary force of the spring is limited, and it still cannot provide sufficient support in some critical stages. Especially in the initial stage of pushing up the tailgate, the reaction force of the spring is easily insufficient, resulting in the motor needing to bear nearly the entire weight of the tailgate; and in the final stage when the tailgate is about to close, the effect of the spring is also relatively limited, and the motor is still in a high-load operation state. Long-term high-load operation can easily lead to motor overload, thereby shortening the service life of the actuator and increasing maintenance costs. Summary of the invention

[0004] The present invention provides an electric vehicle tailgate actuator spring and a tailgate actuator thereof, which can provide sufficient supporting force at the initial stage of opening and the final stage of closing the electric vehicle tailgate, so as to reduce the load of the motor, shorten the high-load operation time of the motor, and increase the service life of the actuator.

[0005] The technical solution of the present invention is as follows: A spring for an electric vehicle tailgate actuator comprises a spring body, wherein the spring body is spiral and comprises a first return spring segment that can be quickly ejected and a second return spring segment, wherein the first return spring segment is fixedly connected to the second return spring segment.

[0006] Furthermore, the first return spring segment is a phase change return spring segment that can quickly restore the initial shape at a relatively high temperature to provide thrust, and the second return spring segment is an elastic return spring segment that provides thrust through elastic deformation.

[0007] Furthermore, the length of the first return spring segment in the spring body accounts for 25%, the length of the second return spring segment in the spring body accounts for 75%, the recovery starting temperature of the first return spring segment is 58°C-63°C, and the recovery completion temperature of the first return spring segment is 68°C-73°C.

[0008] Furthermore, the spring body is a flat structure, and the cross-section of the spring body is a rectangular structure.

[0009] Furthermore, the elastic reset section is made of carbon steel material, and the phase change reset section is made of nickel-titanium alloy material.

[0010] An electric vehicle tailgate actuator comprises an electric vehicle tailgate actuator spring, an outer sleeve, and a telescopic rod, wherein the telescopic rod is located in the outer sleeve, a driving motor is arranged in the outer sleeve, the driving motor is connected to a reduction gear set, the reduction gear set is connected to a screw rod, the telescopic rod is sleeved on the screw rod, the telescopic rod is threadedly connected to the screw rod, the spring body is located in the telescopic rod, a baffle is provided on the side of the reduction gear set facing away from the driving motor, the baffle is fixedly connected to the outer sleeve, the screw rod is connected to the telescopic rod through the baffle, the first return spring segment abuts against the baffle, the second return spring segment abuts against the telescopic rod, the baffle is provided with a fixed groove body, one end of the first return spring segment abutting against the baffle is embedded in the fixed groove body, the fixed groove body is fixedly connected to an electric heating wire, and the electric heating wire is connected to the first return spring segment through the fixed groove body.

[0011] Furthermore, the outer sleeve is provided with a first heat sink, the first heat sink is located within the length range of the phase change reset section, and the telescopic rod is provided with a second heat sink, the second heat sink overlaps with the first heat sink.

[0012] Furthermore, a Hall sensor for detecting the number of rotations of the screw rod is provided between the reduction gear set and the baffle, and a thin film temperature sensor is provided on the side of the baffle facing the spring body. The thin film temperature sensor is bonded to one end of the first reset spring segment that abuts the baffle.

[0013] The working principle and beneficial effects of the present invention are: The present invention provides optimized force distribution during the opening and closing process of the electric vehicle tailgate through the design of a two-stage spring body. In the initial stage of the tailgate opening, the first return spring segment that pops open quickly provides additional thrust, reducing the starting load of the motor, and subsequently continues to provide a certain thrust through the second return spring segment, further reducing the load of the motor; and in the final stage of the tailgate closing, the first return spring can provide sufficient support to reduce the weight of the tailgate borne by the motor, while the second return spring segment can provide continuous support, further reducing the weight borne by the motor, thereby reducing the time of high-load operation. This design not only effectively reduces the risk of motor wear, but also extends the service life of the entire actuator and improves the reliability of the electric tailgate system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] Figure 1 It is a structural schematic diagram of the electric vehicle tailgate actuator spring of the present invention; Figure 2 It is a structural schematic diagram of the electric vehicle tailgate actuator of the present invention; Figure 3 for Figure 2 A front view of Figure 4 for Figure 3 Sectional view at AA; Figure 5 for Figure 4 A magnified image of point A; Figure 6 It is a schematic diagram of the internal structure of the tailgate actuator of an electric vehicle according to the present invention; Figure 7 for Figure 6 Enlarged view of point B.

[0016] In the figure: 1, outer sleeve; 2, telescopic rod; 3, driving motor; 4, reduction gear set; 5, Hall sensor; 6, spring body; 11, baffle; 12, fixed groove; 13, electric heating wire; 14, thin film temperature sensor; 15, first heat sink; 21, second heat sink; 43, screw rod; 61, first return spring segment; 62, second return spring segment. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1 to Figure 7 As shown, this embodiment proposes an electric vehicle tailgate actuator spring, including a spring body 6, the spring body 6 is spiral, the spring body 6 includes a first return spring segment 61 that can be quickly ejected and a second return spring segment 62, the first return spring segment 61 is fixedly connected to the second return spring segment 62.

[0019] The first return spring segment 61 is responsible for rapid opening and providing initial elastic support. It can quickly provide additional thrust in the initial stage of tailgate opening to reduce the starting load of the motor, and provide additional support in the final stage of tailgate closing to reduce the load on the motor. The second return spring segment 62 is a standard spring segment, which is used to continuously provide thrust and support force to assist the motor in reducing its load during the operation stage. Through the synergistic effect of these two spring segments, a more balanced force is provided during the entire opening and closing process of the tailgate, reducing the burden on the motor. The first return spring segment 61 and the second return spring segment 62 can be connected and fixed by welding.

[0020] In this embodiment, the first return spring segment 61 is a phase change return segment that can quickly restore its original shape at a relatively high temperature to provide thrust, and the second return spring segment 62 is an elastic return segment that provides thrust through elastic deformation.

[0021] The first reset spring segment 61 is a phase change reset segment, that is, it is made of shape memory alloy material, and restores its original shape through phase change at a specific temperature to provide a driving force. During the opening and closing process of the tailgate, this section of spring determines when to play a role by adjusting the temperature. This phase change characteristic enables the first reset spring segment 61 to quickly provide elastic thrust when needed, especially in the initial stage of opening the tailgate or at the critical moment of closing, to ensure that the motor receives additional support and reduce its starting load. The first reset spring segment 61 composed of phase change material has the characteristics of fast recovery speed, and it does not need to be deformed and restored by mechanical force, and can accurately control the recovery time, which can avoid the elastic hysteresis phenomenon of traditional springs.

[0022] The second return spring segment 62 is made of a traditional elastic material and provides support force through elastic deformation. This spring segment is responsible for providing a stable thrust during the entire tailgate movement, especially in the middle stage of the tailgate opening and closing, it can continuously provide thrust to assist the normal operation of the tailgate and reduce the pressure on the motor. The second return spring segment 62 provides continuous support force through elastic deformation, and cooperates with the first return spring segment 61, so that in the final stage of the tailgate closing, it provides a strong thrust due to compression, thereby offsetting part of the gravity of the tailgate, reducing the burden on the motor, and thus extending the life of the motor and the entire system.

[0023] In this embodiment, the length of the first return spring segment 61 in the spring body 6 accounts for 25%, the length of the second return spring segment 62 in the spring body 6 accounts for 75%, the recovery starting temperature of the first return spring segment 61 is 58°C-63°C, and the recovery completion temperature of the first return spring segment 61 is 68°C-73°C.

[0024] The first return spring segment 61, which accounts for 25%, is specifically responsible for coping with the large load at the initial opening of the tailgate, and reduces the overload of the motor by quickly restoring the initial shape. Because the shape memory alloy has strong tensile and compression resistance at the temperature of phase change recovery, it is not easy to be compressed at the temperature of phase change recovery. Therefore, the use of the first return spring segment 61, which accounts for 25%, will not cause the first return spring segment 61 to dissipate heat in time due to the rapid start and close of the tailgate, thereby affecting the opening and closing of the tailgate. It can shorten the length of the entire spring body 6 by compressing the second return spring to achieve normal closure of the tailgate. Therefore, the second return spring segment 62 should be provided with a redundant compression length to ensure that the first return spring segment 61 cannot be fully compressed, so that the second return spring segment 62 can be further compressed to ensure the normal operation of the actuator. The phase change recovery shape of the first return spring segment 61 should be its unfolded shape to ensure that it can be quickly unfolded after the phase change, provide sufficient support, and reduce the pressure on the motor.

[0025] The first return spring segment 61 starts phase change recovery at a temperature range of 58°C-63°C to provide thrust, and completes recovery at 68°C-73°C. In automotive applications such as electric tailgates, the external ambient temperature is usually between -30°C and 50°C. Selecting a temperature range of 58°C-63°C to start phase change recovery and 68°C-73°C to complete recovery will prevent the spring from recovering at normal ambient temperatures, but only when heated. This can prevent uncontrolled shape recovery. Preferably, the starting phase change recovery temperature of the first return spring segment 61 is 60°C, and the ending phase change recovery temperature of the first return spring segment 61 is 70°C. The temperature between 60°C and 70°C is relatively safe for the internal components and passengers of the car, and will not cause damage to other components or materials (such as plastic, rubber, etc.) in the car. At the same time, the risk is low when the operator contacts the parts at this temperature; and the temperature selection between 60°C and 70°C can balance the heating time and energy consumption, ensuring that the system can respond quickly without consuming too much energy. At the same time, this temperature range is low enough to ensure a short heating time and achieve rapid recovery and response capabilities. For devices that need to be opened and closed in time, such as electric tailgates, a shorter response time helps to improve user experience and system reliability.

[0026] The second return spring segment 62, which accounts for 75%, covers most of the travel of the telescopic rod 2, ensuring that a balanced and stable supporting force is provided during most of the time periods when the tailgate is opened and closed, making the system run more smoothly.

[0027] In this embodiment, the spring body 6 is a flat structure, and the cross section of the spring body 6 is a rectangular structure.

[0028] The spring body 6 is an overall flat structure with a rectangular cross section, which enables it to provide greater elastic force and support force in a limited space. Compared with the traditional circular cross-section spring, the rectangular cross section of the flat spring is conducive to increasing the contact area and improving the elastic force output per unit length. The flat structure design allows the spring to have a higher load-bearing capacity in a small space, while also improving the stability of the spring and reducing the lateral displacement or deformation of the spring during compression or recovery. Since the spring cross section is rectangular, it is more evenly stressed and can maintain a stable elastic output in a complex working environment, extending its service life, while providing a greater support force, further reducing the burden on the motor.

[0029] In this embodiment, the elastic reset section is made of carbon steel material, and the phase change reset section is made of nickel-titanium alloy material.

[0030] Carbon steel has high strength and elastic modulus, can withstand large deformation forces, and can quickly restore its original shape after the force disappears. This makes it very suitable as a material that provides elastic restoring force. Carbon steel exhibits good fatigue resistance under repeated loads, can maintain stable elastic properties during long-term use, and is not prone to fatigue damage. The most significant property of nickel-titanium alloy is its shape memory effect, which can restore the deformed state to its initial shape when heated within a specific temperature range (such as 60℃-70℃). This property makes it particularly suitable for use in phase change reset sections, where spring reset is achieved by heating. Nickel-titanium alloy can also maintain high fatigue strength under repeated stress, and is not prone to material fatigue damage.

[0031] A tailgate actuator for an electric vehicle comprises a tailgate actuator spring for an electric vehicle, an outer sleeve 1, and a telescopic rod 2. The telescopic rod 2 is located in the outer sleeve 1. A driving motor 3 is arranged in the outer sleeve 1. The driving motor 3 is connected to a reduction gear set 4. The reduction gear set 4 is connected to a screw rod 43. The telescopic rod 2 is sleeved on the screw rod 43. The telescopic rod 2 is threadedly connected to the screw rod 43. A spring body 6 is located in the telescopic rod 2. A baffle 11 is arranged on the side of the reduction gear set 4 facing away from the driving motor 3. The baffle 11 is fixedly connected to the outer sleeve 1. The screw rod 43 passes through the baffle 11 and is connected to the telescopic rod 2. A first return spring segment 61 abuts against the baffle 11. A second return spring segment 62 abuts against the telescopic rod 2. A fixed groove body 12 is arranged on the baffle 11. One end of the first return spring segment 61 abutting against the baffle 11 is embedded in the fixed groove body 12. The fixed groove body 12 is fixedly connected to an electric heating wire 13. The electric heating wire 13 is connected to the first return spring segment 61 through the fixed groove body 12.

[0032] The outer sleeve 1 provides a solid shell for the entire actuator, and plays a role in protecting the internal structure (such as the drive motor 3, the reduction gear set 4, the screw rod 43 and the spring body 6, etc.), while guiding the extension and contraction of the telescopic rod 2. The outer sleeve 1 provides protection to prevent dust and foreign matter from entering the actuator, ensuring smooth operation of the system and extending the service life. The telescopic rod 2 cooperates with the outer sleeve 1 as a direct driving element for the tailgate movement, pushing or pulling the tailgate to achieve opening and closing movement. The telescopic rod 2 is connected to the screw rod 43 through a thread, realizing the conversion of the driving force of the drive motor 3 into the linear movement of the tailgate, ensuring the stability of the opening and closing of the tailgate. In order to ensure the stable transmission of the telescopic rod 2 and the screw rod 43, a limit block (not shown in the figure) should be set at one end of the telescopic rod 2 facing the drive motor 3 to prevent the telescopic rod 2 from rotating with the screw rod 43 during the transmission process of the telescopic rod 2 and the screw rod 43. The setting of the limit block is used to ensure that the telescopic rod 2 is driven by the screw rod 43 to move linearly. The driving motor 3 is the power source of the entire actuator, responsible for driving the reduction gear set 4 and the screw rod 43 to rotate, thereby driving the telescopic rod 2 to perform telescopic movement and realize the opening and closing of the tailgate. The motor provides precise power output, automates the opening and closing operation of the tailgate, and reduces the need for manual operation. The reduction gear set 4 converts the high-speed rotation of the motor into a low-speed high-torque output, providing a greater driving force to the screw rod 43, so that it pushes the telescopic rod 2. By reducing the speed and increasing the torque, the reduction gear set 4 reduces the load of the motor and makes the opening and closing of the tailgate softer, preventing the safety hazards caused by the too-fast opening and closing of the tailgate. The screw rod 43 is connected to the telescopic rod 2 by a thread, and rotates under the drive of the reduction gear set 4 to realize the extension or contraction of the telescopic rod 2, thereby pushing the tailgate to open and close. The threaded connection design of the screw rod 43 converts the rotational motion of the motor into linear motion, which improves the stability and transmission efficiency of the system. The spring body 6 is located in the telescopic rod 2, and assists the motor to complete the opening and closing of the tailgate through it. The baffle 11 is fixedly connected to the outer sleeve 1, serving as a support surface for one end of the spring body 6, and at the same time providing support for the screw rod 43 and allowing it to pass through, ensuring that the spring can work normally when the telescopic rod 2 moves. The design of the baffle 11 provides a fixed position for the spring, so that the spring can play a stable role when the telescopic rod 2 moves, without offset or deformation. In order to ensure the stable operation of the actuator and extend the service life of the actuator, the actuator as a whole should be designed to be waterproof, especially between the outer sleeve 1 and the telescopic rod 2. A sealing ring (not marked in the figure) should be set at one end of the telescopic rod 2 at both ends of the outer sleeve 1 to prevent the entry of rainwater, thereby extending the service life of the actuator. The fixed groove body 12 embeds one end of the shape memory alloy spring so that it can work stably when heated and cooled. The electric heating wire 13 is connected to the first reset spring segment 61 through the fixed groove body 12 to ensure that it is heated when needed, thereby inducing a phase change.The fixed groove body 12 fixes the shape memory alloy spring and the electric heating wire 13 together, which can accurately control the heating speed and phase change temperature of the shape memory alloy, so that it can respond quickly according to work requirements and quickly reach the recovery temperature, ensuring that thrust is provided in time at a specific stage of opening or closing the tailgate.

[0033] In this embodiment, the outer sleeve 1 is provided with a first heat sink 15 , which is located within the length range of the phase change reset section, and the telescopic rod 2 is provided with a second heat sink 21 , which overlaps with the first heat sink 15 .

[0034] The first heat sink 15 is mounted on the outer sleeve 1 and is located within the length range of the phase change reset section. It is mainly used to help the first reset spring section 61 to quickly dissipate heat after working at high temperature. The second heat sink 21 is mounted on the telescopic rod 2 and overlaps with the heat dissipation area of ​​the first heat sink 15 to form a double-layer heat dissipation effect and improve the overall heat dissipation efficiency. The double heat sink structure significantly increases the heat dissipation area, which can quickly reduce the temperature of the first reset spring section 61 and ensure timely cooling of the first reset spring section 61 after working at high temperature. This can shorten the transition time from the high temperature state to the normal temperature state, allowing the spring to enter the next working cycle faster and avoid performance degradation caused by high temperature delay. By enhancing heat dissipation, it can be ensured that the shape memory alloy has more precise phase change temperature control during the recovery process, which helps to improve the working reliability and service life of the phase change reset section.

[0035] In this embodiment, a Hall sensor 5 for detecting the number of rotations of the screw 43 is arranged between the reduction gear group 4 and the baffle 11, and a thin film temperature sensor 14 is arranged on the side of the baffle 11 facing the spring body 6. The thin film temperature sensor 14 is bonded to the end of the first return spring segment 61 that abuts against the baffle 11.

[0036] The Hall sensor 5 is located between the reduction gear set 4 and the baffle 11, and is responsible for detecting the number of rotations of the screw rod 43. This design can be used to accurately calculate the displacement of the telescopic rod 2 to monitor the opening and closing degree of the tailgate. By detecting the number of rotations of the screw rod 43, the Hall sensor 5 can accurately sense the position of the tailgate, accurately control the opening and closing angle of the tailgate, and avoid failures caused by overload operation or misoperation. This can provide accurate feedback data for the system to ensure that the actuator completes the tailgate opening and closing process with the most appropriate force. The Hall sensor 5 can also help detect abnormal rotation conditions (such as jamming or over-operation), thereby playing a protective role and preventing mechanical failure. The film temperature sensor 14 is bonded to the end of the first reset spring section 61 that abuts the baffle 11, and is specifically used to detect the temperature change of the shape memory alloy spring and monitor the temperature state of the phase change reset section in real time. Through real-time temperature feedback, the system can adjust the heating power of the electric heating wire 13 according to the temperature state of the spring to prevent excessive or insufficient heating, thereby ensuring the best phase change efficiency of the shape memory alloy spring. The sensor also avoids material fatigue or excessive expansion due to excessive temperatures, ensuring long-term stability of the spring over multiple opening and closing cycles.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric vehicle tailgate actuator spring, comprising a spring body (6), characterized in that: The spring body (6) is spiral-shaped, and comprises a first return spring segment (61) that can be quickly ejected and a second return spring segment (62), wherein the first return spring segment (61) is fixedly connected to the second return spring segment (62).

2. The electric vehicle tailgate actuator spring according to claim 1, characterized in that: The first return spring segment (61) is a phase change return segment that can quickly restore its original shape at a relatively high temperature and provide thrust, and the second return spring segment (62) is an elastic return segment that provides thrust through elastic deformation.

3. The electric vehicle tailgate actuator spring according to claim 2, characterized in that: The length of the first return spring section (61) in the spring body (6) accounts for 25%, the length of the second return spring section (62) in the spring body (6) accounts for 75%, the recovery start temperature of the first return spring section (61) is 58°C-63°C, and the recovery completion temperature of the first return spring section (61) is 68°C-73°C.

4. The electric vehicle tailgate actuator spring according to claim 1, characterized in that: The spring body (6) has a flat structure, and the cross-section of the spring body (6) has a rectangular structure.

5. The electric vehicle tailgate actuator spring according to claim 2, characterized in that: The elastic reset section is made of carbon steel material, and the phase change reset section is made of nickel-titanium alloy material.

6. An electric vehicle tailgate actuator, characterized in that: The electric vehicle tailgate actuator spring comprises an outer sleeve (1) and a telescopic rod (2) as claimed in any one of claims 2 to 5, wherein the telescopic rod (2) is located in the outer sleeve (1), a driving motor (3) is arranged in the outer sleeve (1), the driving motor (3) is connected to a reduction gear set (4), the reduction gear set (4) is connected to a screw rod (43), the telescopic rod (2) is sleeved on the screw rod (43), the telescopic rod (2) is threadedly connected to the screw rod (43), the spring body (6) is located in the telescopic rod (2), and a baffle (11) is arranged on the side of the reduction gear set (4) facing away from the driving motor (3). The baffle (11) is fixedly connected to the outer sleeve (1); the screw rod (43) passes through the baffle (11) and is connected to the telescopic rod (2); the first return spring segment (61) abuts against the baffle (11); the second return spring segment (62) abuts against the telescopic rod (2); the baffle (11) is provided with a fixed groove body (12); one end of the first return spring segment (61) abutting against the baffle (11) is embedded in the fixed groove body (12); the fixed groove body (12) is fixedly connected with an electric heating wire (13); the electric heating wire (13) is connected to the first return spring segment (61) through the fixed groove body (12).

7. The electric vehicle tailgate actuator according to claim 6, characterized in that: The outer sleeve (1) is provided with a first heat sink (15), the first heat sink (15) is located within the length range of the phase change reset section, and the telescopic rod (2) is provided with a second heat sink (21), the second heat sink (21) overlaps with the first heat sink (15).

8. An electric vehicle tailgate actuator according to claim 6 or 7, characterized in that: A Hall sensor (5) for detecting the number of rotations of the screw rod (43) is provided between the reduction gear set (4) and the baffle (11); a thin film temperature sensor (14) is provided on the side of the baffle (11) facing the spring body (6); the thin film temperature sensor (14) is bonded to one end of the first return spring segment (61) that abuts against the baffle (11).

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