Angle adjusting driver for back row seat backrest of automobile

Abstract

The invention discloses an automobile rear seat backrest angle adjusting driver which comprises a driving motor, a middle speed reducer, an output screw rod and a movable sliding block which are sequentially connected in a driving mode, a power output shaft of the driving motor and the output screw rod are spaced in parallel, the power output shaft is provided with a first worm, and the end of the output screw rod is provided with a second worm wheel. A first worm gear and a second worm which are coaxial and rotate synchronously are embedded in a box body containing cavity of a speed reducer box body of the middle speed reducer, the first worm gear and the second worm are rotationally installed on the speed reducer box body through a mandrel, the first worm is meshed with the first worm gear, and the second worm is meshed with the second worm gear. A screw bearing is rotationally installed at the inner end, corresponding to the output screw, of the speed reducer box, an adjusting nut is installed in an inner hole of the screw bearing in a screwed mode, a screw abrasion-resistant pad is embedded in a nut containing cavity of the adjusting nut, and the screw abrasion-resistant pad makes contact with the output screw in an abutting mode. Through the structural design, the self-locking device has the advantages of being novel in structural design, good in stability and reliability and good in self-locking stability.

Description

Technical Field

[0001] The invention relates to the technical field of automobile accessories, and in particular to a driver for adjusting the angle of a backrest of a rear seat of an automobile. Background Art

[0002] For the rear seat backrests of the car, in order to meet the comfort requirements of the passengers, it is necessary to be able to adjust the seat back angle, and the seat back angle adjustment is driven by the corresponding row seat back angle adjustment driver.

[0003] The patent number is: ZL202411360519.0, and the patent name is: A Chinese invention patent application for an electric angle adjuster for a car seat backrest, which discloses the following technical solutions, specifically: an electric angle adjuster for a car seat backrest, including an adjustment plate, an upper end of the adjustment plate is provided with an arc guide rail, a guide rod is slidably connected in the arc guide rail, one end of the guide rod is connected to a slider, one side of the slider is connected to a lock hook, the lock hook is used to be fixed to one side of the car seat backrest, and a transmission mechanism is installed at one end of the adjustment plate, through which the lock hook drives the car seat backrest to rotate and adjust its use angle; the transmission mechanism includes a motor installed at one end of the adjustment plate, the motor drives a gear box, the output shaft of the gear box is coaxially connected to the screw rod, and the screw rod is threadedly connected to the slider.

[0004] In the process of adjusting the angle of the car seat back by the electric recliner of the car seat back, the lead screw starts to rotate under the drive of the motor, and the slider moves along a specific path under the guidance of the guide rod, so that the angle of the seat back can be adjusted.

[0005] It should be pointed out that the above-mentioned electric recliner for the car seat back still has the following defects, specifically:

[0006] Defect 1. When working, the motor drives the screw to rotate after being decelerated by the gear box. Since the gear box cannot achieve effective self-locking, when the seat back is adjusted to the required angle, the passenger's leaning action or passenger's activities will cause the seat back to bear a large thrust. Since it cannot effectively self-lock, the seat back will shift under the action of a large thrust, and the stability of use is poor;

[0007] Defect 2: Under the thrust generated by passengers when sitting, the seat back will directly transmit the reaction force to the slider and the screw rod. The screw rod will become axially loose under the repeated axial impact force. The axial looseness will make the electric angle adjuster of the car seat back unstable when adjusting the seat back angle; due to the lack of corresponding pre-tightening adjustment mechanism, it is difficult for the screw rod to return to a stable state after loosening, that is, the electric angle adjuster of the car seat back has poor stability in later use. Summary of the invention

[0008] The purpose of the present invention is to provide a rear seat back angle adjustment driver for a vehicle in view of the deficiencies in the prior art. The rear seat back angle adjustment driver for a vehicle has a novel structural design, good stability and reliability, and good self-locking stability.

[0009] To achieve the above object, the present invention is implemented through the following technical solutions.

[0010] A rear seat backrest angle adjustment driver for a car comprises a driving motor, an intermediate reducer, an output screw and a movable slider, wherein the driving motor, the intermediate reducer and the output screw are sequentially connected in driving manner; the movable slider is provided with a slider internal thread hole corresponding to the output screw, the output screw passes through the slider internal thread hole and the output screw is threadedly connected to the movable slider;

[0011] The power output shaft of the driving motor is arranged in parallel and spaced apart from the output screw, the intermediate reducer comprises a reducer housing, a housing accommodating cavity is formed inside the reducer housing, the housing of the driving motor is fastened to the reducer housing, and the power output shaft of the driving motor and the ends of the output screw are respectively extended into the housing accommodating cavity;

[0012] The power output shaft of the driving motor is equipped with a first worm located in the housing cavity, and the end of the output screw is equipped with a second worm wheel located in the housing cavity;

[0013] A first worm gear and a second worm gear which are coaxially arranged and rotate synchronously are embedded in the housing cavity. The first worm gear and the second worm gear are rotatably mounted on the reducer housing through a mandrel. The mandrel is perpendicular to the power output shaft and the output screw of the driving motor respectively. The first worm gear is meshed with the first worm gear, and the second worm gear is meshed with the second worm gear.

[0014] A screw bearing is rotatably installed on the reducer housing corresponding to the inner end of the output screw, the inner hole of the screw bearing is a threaded hole structure, and an adjusting nut is threadedly installed on the inner hole of the screw bearing; a nut accommodating cavity is opened at the end of the adjusting nut facing the output screw, a screw wear-resistant pad is embedded in the nut accommodating cavity, and the screw wear-resistant pad is in pressure contact with the end face of the inner end of the output screw.

[0015] Among them, a rotating part is embedded in the housing cavity of the housing, and the rotating part is rotatably installed on the reducer housing through the core shaft. The first worm gear is arranged at one end of the rotating part, and the second worm is arranged at the other end of the rotating part, and the first worm gear and the second worm are an integrated structure.

[0016] Wherein, the end surface of the inner end portion of the output screw is provided with a screw contact convex point protruding toward the screw wear-resistant pad side, and the screw wear-resistant pad is in pressing contact with the screw contact convex point.

[0017] The reducer housing includes a main housing and a housing cover screwed and fastened to the main housing, and the housing accommodating cavity is formed by the main housing and the housing cover.

[0018] The core shaft is circumferentially limited and installed between the main box body and the box cover. The main box body is provided with wear-resistant pad slots on the two axial end sides of the core shaft. An axial wear-resistant pad is embedded and installed in each wear-resistant pad slot. The two axial end faces of the core shaft are in contact with the axial wear-resistant pads on the corresponding sides respectively.

[0019] The housing of the driving motor includes a front end cover, an intermediate housing, and a rear end cover which are sequentially connected from front to rear, the front end cover is screwed and fastened to the reducer housing, and the power output shaft of the driving motor passes through the front end cover and extends into the housing cavity of the housing;

[0020] The inner wall of the housing cavity is provided with a housing mounting hole opening toward the power output shaft side corresponding to the power output shaft, and the housing mounting hole is embedded with an elastic buffer pad, a front wear-resistant pad and a front bearing arranged in sequence from front to back, the front end of the power output shaft extends into the housing mounting hole, and the front end of the power output shaft is installed on the reducer housing through the front bearing, and the elastic buffer pad is pressed and contacted with the end face of the front end of the power output shaft through the front wear-resistant pad;

[0021] The rear end cover corresponds to the power output shaft and is provided with an end cover mounting hole which is open toward the power output shaft side. The end cover mounting hole is embedded with a rear bearing and a rear wear-resistant pad located at the rear end side of the rear bearing. The rear end portion of the power output shaft extends into the end cover mounting hole, and the rear end portion of the power output shaft is rotatably mounted on the rear end cover through the rear bearing, and the rear wear-resistant pad is in pressure contact with the end face of the rear end portion of the power output shaft.

[0022] Compared with the prior art, the present invention has the following beneficial effects, specifically:

[0023] 1. The intermediate reducer realizes reduction transmission through a first worm-gear pair consisting of a first worm and a first worm wheel, and a second worm-gear pair consisting of a second worm and a second worm wheel. The above-mentioned double worm-gear pair combination structure can effectively increase the output torque of the driving motor, thereby effectively increasing the driving thrust of the movable slider; since each worm-gear pair has a self-locking ability, the double self-locking assembly formed by the double worm-gear pair combination structure can enable the seat back to withstand a large thrust, so that the seat back will not be displaced under a large thrust, and the use stability is good;

[0024] 2. For the output screw, the user can rotate the adjustment nut to keep the screw wear pad in contact with the end face of the inner end of the output screw, so as to eliminate axial looseness and restore the output screw to a stable state, which can effectively improve the axial impact resistance of the product, that is, the invention can effectively improve the stability of later use;

[0025] 3. Therefore, the rear seat backrest angle adjustment driver of the present invention has the advantages of novel structural design, good stability and reliability, and good self-locking stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described below with the aid of the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is a schematic diagram of the decomposition of the present invention.

[0029] Figure 3 It is a cross-sectional schematic diagram of the present invention.

[0030] Figure 4 It is a cross-sectional schematic diagram of another position of the present invention.

[0031] Figure 5 It is a cross-sectional schematic diagram of another position of the present invention.

[0032] Figure 6 It is a schematic diagram of the local structure of the present invention.

[0033] exist Figures 1 to 6 Included are:

[0034] 1-driving motor; 11-power output shaft; 12-front end cover; 13-middle housing; 14-rear end cover; 141-end cover mounting hole; 2-middle reducer; 21-reducer housing; 211-housing cavity; 212-main housing; 2121-wear-resistant pad slot; 213-housing cover; 214-housing mounting hole; 221-first worm; 222-first worm wheel; 231-second worm; 2 32-second worm gear; 24-core shaft; 25-rotating member; 3-output screw; 31-screw contact convex point; 4-movable slider; 41-threaded hole in the slider; 51-screw bearing; 52-adjusting nut; 521-nut accommodating chamber; 53-screw wear pad; 6-axial wear pad; 71-elastic buffer pad; 72-front wear pad; 73-front bearing; 81-rear bearing; 82-rear wear pad. DETAILED DESCRIPTION

[0035] The present invention is described below in conjunction with specific implementation methods.

[0036] Embodiment 1, as Figures 1 to 6 As shown, a rear seat backrest angle adjustment driver for a car includes a driving motor 1, an intermediate reducer 2, an output screw 3 and a movable slider 4. The driving motor 1, the intermediate reducer 2 and the output screw 3 are sequentially driven and connected; the movable slider 4 is provided with a slider internal threaded hole 41 corresponding to the output screw 3, the output screw 3 passes through the slider internal threaded hole 41 and the output screw 3 is threadedly connected to the movable slider 4.

[0037] Among them, Figures 1 to 6 As shown, the power output shaft 11 of the drive motor 1 is arranged in parallel and spaced apart from the output screw 3, the intermediate reducer 2 includes a reducer housing 21, and a housing accommodating cavity 211 is formed inside the reducer housing 21. The outer shell of the drive motor 1 is fastened to the reducer housing 21, and the ends of the power output shaft 11 and the output screw 3 of the drive motor 1 are respectively extended into the housing accommodating cavity 211.

[0038] Further, such as Figures 2 to 6 As shown, the power output shaft 11 of the driving motor 1 is equipped with a first worm 221 located in the box accommodating cavity 211 , and the end of the output screw 3 is equipped with a second worm gear 232 located in the box accommodating cavity 211 .

[0039] Furthermore, if Figures 2 to 6 As shown, the housing cavity 211 is embedded with a first worm gear 222 and a second worm 231 which are coaxially arranged and rotate synchronously. The first worm gear 222 and the second worm gear 231 are rotatably mounted on the reducer housing 21 through a core shaft 24. The core shaft 24 is respectively perpendicular to the power output shaft 11 of the drive motor 1 and the output screw 3. The first worm gear 221 is meshed with the first worm gear 222, and the second worm gear 231 is meshed with the second worm gear 232.

[0040] In addition, a screw bearing 51 is rotatably installed on the reducer housing 21 corresponding to the inner end of the output screw 3. The inner hole of the screw bearing 51 is a threaded hole structure, and an adjusting nut 52 is threadedly installed in the inner hole of the screw bearing 51; the adjusting nut 52 is provided with a nut accommodating cavity 521 toward the end of the output screw 3, and a screw wear-resistant pad 53 is embedded in the nut accommodating cavity 521, and the screw wear-resistant pad 53 is in pressure contact with the end face of the inner end of the output screw 3.

[0041] In the process of realizing the sliding of the movable slider 4 by the rear seat back angle adjustment driver of the automobile of the first embodiment, the driving motor 1 drives the first worm 221 to rotate through its power output shaft 11, and the first worm 221 drives the first worm wheel 222 to rotate, and the second worm 231 rotates synchronously with the first worm wheel 222, and the second worm 231 drives the second worm wheel 232 to rotate, and the second worm wheel 232 drives the output screw 3 to rotate, and the output screw and the movable slider 4 together form a threaded transmission substructure, that is, the rotating output screw 3 drives the movable slider 4 to slide.

[0042] It should be pointed out that the intermediate reducer 2 of the first embodiment realizes the reduction transmission through the first worm gear pair composed of the first worm 221 and the first worm wheel 222, and the second worm gear pair composed of the second worm 231 and the second worm wheel 232. The above-mentioned double worm gear pair combination structure can effectively improve the output torque of the drive motor 1, and then effectively improve the driving thrust of the movable slider 4. In addition, since each worm gear pair has a self-locking ability, the above-mentioned double worm gear pair combination structure can realize a double self-locking function. When the rear seat back angle adjustment driver of the first embodiment adjusts the seat back to the required angle position, the double self-locking assembly formed by the double worm gear pair combination structure can make the seat back bear a large thrust, which will not cause the seat back to shift under the action of a large thrust, and has good stability in use.

[0043] It should be further pointed out that the core shaft 24 of the first embodiment is respectively perpendicular to the power output shaft 11 and the output screw 3 of the drive motor 1, and the power output shaft 11 of the drive motor 1, the first worm 221, the first worm wheel 222, the core shaft 24, the second worm 231, the second worm wheel 232 and the output screw 3 together constitute a multi-stage staggered transmission structure, which is compact and can effectively reduce the overall occupied space.

[0044] It should be emphasized that, for the output screw 3 of the first embodiment, when working, the adjusting nut 52 can be rotated to make the adjusting nut 52 move axially relative to the screw bearing 51, thereby making the adjusting nut 52 and the screw wear pad 53 move axially along the output screw 3 to ensure that the screw wear pad 53 maintains abutting contact with the end face of the inner end of the output screw 3. During the use of the rear seat back angle adjustment driver of the first embodiment, when the output screw 3 is axially loose, the user can rotate the adjusting nut 52 to make the screw wear pad 53 maintain abutting contact with the end face of the inner end of the output screw 3 to eliminate the axial looseness and restore the output screw 3 to a stable state, thereby effectively improving the axial impact resistance of the product, that is, the rear seat back angle adjustment driver of the first embodiment can effectively improve the stability of later use.

[0045] In summary, it can be seen that, through the above structural design, the rear seat back angle adjustment driver of the first embodiment of the present invention has the advantages of novel structural design, good stability and reliability, and good self-locking stability.

[0046] Embodiment 2, as Figure 2 , Figure 5 as well as Figure 6 As shown, the difference between the second embodiment and the first embodiment is that a rotating part 25 is embedded in the housing cavity 211, and the rotating part 25 is rotatably installed on the reducer housing 21 through the core shaft 24, the first worm gear 222 is arranged at one end of the rotating part 25, and the second worm 231 is arranged at the other end of the rotating part 25, and the first worm gear 222 and the second worm 231 are an integrated structure.

[0047] The first worm wheel 222 and the second worm 231 of the second embodiment are an integrated structure. The integrated structure design can effectively ensure the accuracy of the synchronous rotation of the first worm wheel 222 and the second worm 231, and can also improve the convenience of assembly.

[0048] Embodiment three, as Figure 4 As shown, the difference between the third embodiment and the first embodiment is that the end surface of the inner end of the output screw 3 is provided with a screw contact protrusion 31 protruding toward the screw wear pad 53 side, and the screw wear pad 53 is in pressure contact with the screw contact protrusion 31.

[0049] By pressing the screw contact protrusion 31 against the screw wear pad 53 , the third embodiment can effectively reduce the contact area between the rear end of the output screw 3 and the screw wear pad 53 , thereby reducing the resistance to the rotation of the output screw 3 and improving the smoothness of the rotation of the output screw 3 .

[0050] Embodiment 4, as Figures 1 to 6 As shown, the difference between the fourth embodiment and the first embodiment is that the reducer housing 21 includes a main housing 212 and a housing cover 213 screwed and fastened to the main housing 212 , and the housing accommodating cavity 211 is surrounded by the main housing 212 and the housing cover 213 .

[0051] Among them, the core shaft 24 is circumferentially limited and installed between the main box body 212 and the box cover 213. The main box body 212 is respectively provided with wear-resistant pad grooves 2121 on the two axial end sides of the core shaft 24. An axial wear-resistant pad 6 is respectively embedded and installed in each wear-resistant pad groove 2121. The two axial end faces of the core shaft 24 are respectively in contact with the axial wear-resistant pad 6 on the corresponding side.

[0052] It should be explained that the axial wear-resistant pad 6 of the fourth embodiment can be a high-strength carbon tool steel wear-resistant plate. The two axial wear-resistant pads 6 axially limit the core shaft 24. The reliability of this structural design is higher than that of the ball bearing structure, and its service life is longer.

[0053] Embodiment 5, as Figure 2 and Figure 3 As shown, the difference between the fifth embodiment and the first embodiment is that the outer casing of the driving motor 1 includes a front end cover 12, an intermediate casing 13, and a rear end cover 14 which are sequentially connected from front to back, the front end cover 12 is screwed and fastened to the reducer housing 21, and the power output shaft 11 of the driving motor 1 passes through the front end cover 12 and extends into the housing cavity 211.

[0054] Among them, the inner wall of the box accommodating cavity 211 corresponds to the power output shaft 11 and is provided with a box mounting hole 214 opening toward the side of the power output shaft 11. The box mounting hole 214 is embedded with an elastic buffer pad 71, a front wear-resistant pad 72 and a front bearing 73 arranged in sequence from front to back. The front end of the power output shaft 11 extends into the box mounting hole 214, and the front end of the power output shaft 11 is installed on the reducer box 21 through the front bearing 73. The elastic buffer pad 71 is pressed and contacted with the end face of the front end of the power output shaft 11 through the front wear-resistant pad 72.

[0055] In addition, the rear end cover 14 is provided with an end cover mounting hole 141 corresponding to the power output shaft 11, and the end cover mounting hole 141 is embedded with a rear bearing 81 and a rear wear-resistant pad 82 located at the rear end side of the rear bearing 81. The rear end portion of the power output shaft 11 extends into the end cover mounting hole 141, and the rear end portion of the power output shaft 11 is rotatably mounted on the rear end cover 14 through the rear bearing 81, and the rear wear-resistant pad 82 is pressed and contacted with the end face of the rear end portion of the power output shaft 11.

[0056] It should be pointed out that due to the elastic force of the elastic buffer pad 71, the end faces of the two ends of the power output shaft 11 of the fifth embodiment are respectively pressed and contacted with the front wear-resistant pad 72 and the rear wear-resistant pad 82 on the corresponding sides, and the power output shaft 11 is limited between the front wear-resistant pad 72 and the rear wear-resistant pad 82. This structural design can effectively reduce the axial movement of the power output shaft 11 of the drive motor 1, thereby improving the stability of the drive motor 1 during operation.

[0057] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A rear seat backrest angle adjustment driver for a vehicle, comprising a drive motor (1), an intermediate reducer (2), an output screw rod (3) and a movable slider (4), wherein the drive motor (1), the intermediate reducer (2) and the output screw rod (3) are sequentially connected in driving relation; the movable slider (4) is provided with a slider internal threaded hole (41) corresponding to the output screw rod (3); the output screw rod (3) passes through the slider internal threaded hole (41) and the output screw rod (3) is threadedly connected to the movable slider (4); Features: The power output shaft (11) of the drive motor (1) and the output screw (3) are arranged in parallel and spaced apart, the intermediate reducer (2) comprises a reducer housing (21), a housing accommodating cavity (211) is formed inside the reducer housing (21), the housing of the drive motor (1) is fixedly mounted on the reducer housing (21), and the ends of the power output shaft (11) and the output screw (3) of the drive motor (1) respectively extend into the housing accommodating cavity (211); The power output shaft (11) of the driving motor (1) is provided with a first worm (221) located in the housing chamber (211), and the end of the output screw (3) is provided with a second worm wheel (232) located in the housing chamber (211); A first worm gear (222) and a second worm (231) are coaxially arranged and synchronously rotated, and are embedded in the housing cavity (211). The first worm gear (222) and the second worm gear (231) are rotatably mounted on the reducer housing (21) via a core shaft (24). The core shaft (24) is respectively perpendicular to the power output shaft (11) of the drive motor (1) and the output screw (3). The first worm gear (221) meshes with the first worm gear (222), and the second worm gear (231) meshes with the second worm gear (232). A screw bearing (51) is rotatably mounted on the reducer housing (21) corresponding to the inner end of the output screw (3); the inner hole of the screw bearing (51) is a threaded hole structure, and an adjusting nut (52) is threadedly mounted on the inner hole of the screw bearing (51); the adjusting nut (52) is provided with a nut accommodating cavity (521) toward the end of the output screw (3); a screw wear pad (53) is embedded in the nut accommodating cavity (521), and the screw wear pad (53) is in pressure contact with the end surface of the inner end of the output screw (3).

2. The rear seat backrest angle adjustment actuator for a vehicle according to claim 1, characterized in that: A rotating member (25) is embedded in the housing accommodating cavity (211), and the rotating member (25) is rotatably mounted on the reducer housing (21) via the core shaft (24); the first worm wheel (222) is arranged at one end of the rotating member (25), and the second worm (231) is arranged at the other end of the rotating member (25); and the first worm wheel (222) and the second worm (231) are an integrated structure.

3. The rear seat backrest angle adjustment actuator for a vehicle according to claim 1, characterized in that: The end surface of the inner end of the output screw (3) is provided with a screw contact protrusion (31) protruding toward the screw wear pad (53) side, and the screw wear pad (53) is in pressing contact with the screw contact protrusion (31).

4. The rear seat backrest angle adjustment actuator for a vehicle according to claim 1, characterized in that: The reducer housing (21) comprises a main housing (212) and a housing cover (213) screwed and fastened to the main housing (212); the housing accommodating cavity (211) is formed by the main housing (212) and the housing cover (213); The core shaft (24) is installed between the main box body (212) and the box cover (213) in a circumferentially limited manner. The main box body (212) is provided with wear-resistant pad slots (2121) at two axial end sides of the core shaft (24). An axial wear-resistant pad (6) is respectively embedded and installed in each wear-resistant pad slot (2121). The two axial end faces of the core shaft (24) are respectively in contact with the axial wear-resistant pad (6) on the corresponding side.

5. The rear seat backrest angle adjustment actuator for a vehicle according to claim 1, characterized in that: The housing of the driving motor (1) comprises a front end cover (12), an intermediate housing (13), and a rear end cover (14) which are connected in sequence from front to rear, the front end cover (12) being screwed and fastened to the reducer housing (21), and the power output shaft (11) of the driving motor (1) passes through the front end cover (12) and extends into the housing cavity (211); The inner wall of the housing cavity (211) is provided with a housing mounting hole (214) opening toward the side of the power output shaft (11) corresponding to the power output shaft (11); an elastic buffer pad (71), a front wear pad (72) and a front bearing (73) arranged in sequence from front to back are embedded in the housing mounting hole (214); the front end of the power output shaft (11) extends into the housing mounting hole (214); the front end of the power output shaft (11) is mounted on the reducer housing (21) via the front bearing (73); the elastic buffer pad (71) is in pressure contact with the end surface of the front end of the power output shaft (11) via the front wear pad (72); The rear end cover (14) is provided with an end cover mounting hole (141) corresponding to the power output shaft (11) and opening toward the side of the power output shaft (11). A rear bearing (81) and a rear wear-resistant pad (82) located at the rear end side of the rear bearing (81) are embedded in the end cover mounting hole (141). The rear end of the power output shaft (11) extends into the end cover mounting hole (141), and the rear end of the power output shaft (11) is rotatably mounted on the rear end cover (14) through the rear bearing (81). The rear wear-resistant pad (82) is in pressure contact with the end surface of the rear end of the power output shaft (11).

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