A power output auxiliary drive device for a vehicle power plant

Abstract

The application discloses a power output auxiliary driving device of a vehicle power device and belongs to the technical field of vehicle power output. The device shell is internally provided with an input gear and an output gear which are mutually meshed. An input shaft is drivingly connected to the input gear, and an output shaft is drivingly connected to the output gear. An active transmission shaft is rotatably connected to the input shaft. A transmission clutch mechanism and a matched electric driving part are used to switch the transmission relationship between the active transmission shaft and the input shaft between transmission connection and rotation connection. The technical points are as follows: the transmission clutch mechanism comprises a static transmission wheel and a sliding transmission part. The electric driving part is used to drive the sliding transmission part to slide inwards and outwards, so that the sliding transmission part is attached to or separated from the static transmission wheel. The switching mode is fast in response, does not cause serious friction or jamming, the constituent parts have a long service life, the device can be applied to all gear shapes, and has strong adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle power output, and particularly relates to a power output auxiliary driving device of a vehicle power device. BACKGROUND

[0002] The power output auxiliary driving device of a vehicle power device is an important component in a vehicle power system, which is mainly used for assisting a main driving device (such as an engine or an electric motor) to perform power output. Through the device, a vehicle can more efficiently utilize power under different working conditions, improve fuel economy, reduce emissions, and enhance driving comfort and safety.

[0003] A power take-off is a relatively common power output auxiliary driving device, also known as a power output device, which is a device for transmitting power through gear meshing. It can transmit part of the power of an engine to the facilities on the vehicle to enable the vehicle to realize additional power output. The power take-off is usually applied to special-purpose vehicles to enable these vehicles to have power output other than vehicle driving, thereby realizing special-purpose functions.

[0004] The patent document with the publication number CN104191970A discloses a power take-off, an input driving gear of which is provided with end face teeth, and an input driven gear has both end face teeth and cylindrical teeth. The cylindrical teeth of the input driven gear are in constant meshing with an output gear on an output gear shaft. When it is necessary to realize gear shifting, it is only needed to push the input driven gear to move axially. When the end face teeth at the front end of the input driven gear and the end face teeth at the rear end of the input driving gear are in meshing, the power on the intermediate shaft of the transmission can be transmitted to the input driven gear, and then transmitted to the output gear shaft through the input driven gear, and finally output through the output flange. Compared with the conventional power take-off which generally adopts the meshing mode of cylindrical teeth, the power take-off adopts the meshing mode of end face teeth, has a simple structure, omits many components, and is easy to process and assemble, and low in cost.

[0005] However, in the process of implementing the above technical solution, it is found that the above technical solution has the following technical problems:

[0006] In the above technical solution, the input driven gear slides to be connected, but a perfect structure is lacked to control and limit the sliding of the input driven gear, the meshing and disengaging of the input driven gear and the input driving gear cannot be controlled timely and automatically according to the demand of the operator, and the output and interruption of the power cannot be controlled timely and automatically, in addition, since the input driven gear and the output gear slide to be engaged, when the on-off of the power output is switched frequently at a high rotating speed, the input driven gear and the output gear will rub fiercely and wear out quickly, especially, in order to obtain a better power transmission effect, a helical gear is usually used in the power take-off, and in the above solution, if the helical gear is used, the sliding of the input driven gear will be affected, the input driven gear will be stuck in the sliding, therefore, the power output auxiliary driving device of the vehicle power device is provided. SUMMARY

[0007] The technical problem to be solved by the present application is to provide a power output auxiliary driving device of a vehicle power device, the power output auxiliary driving device is provided with a transmission clutch mechanism for controlling power transmission, when the transmission clutch mechanism is engaged, the movable transmission shaft is in transmission connection with the input shaft, at this time, the output shaft rotates to output torque, when the transmission clutch mechanism is disengaged, the movable transmission shaft is in rotating connection with the input shaft, at this time, the output shaft stops rotating to interrupt the output, wherein the transmission clutch mechanism comprises a static transmission wheel and a sliding transmission part, an electric driving part is arranged to drive the sliding transmission part to slide in and out, so that the sliding transmission part is in contact with or separated from the static transmission wheel, the switching mode is fast in response, and the serious friction or sticking does not occur, the service life of the components is long, the transmission clutch mechanism can be applied to all gear shapes, and has strong adaptability, and the technical problems in the comparative technology that the output and interruption of the power cannot be controlled timely and automatically, and the gear set in sliding engagement is easy to wear and deform and difficult to adapt to the helical gear are solved.

[0008] The technical solution adopted by the embodiment of the present application to solve the technical problem is as follows:

[0009] The power output auxiliary driving device of the vehicle power device comprises a device shell, a cover plate connected by bolts is arranged on the front end cover of the device shell, an input gear and an output gear are arranged in the device shell, the input gear and the output gear are in rotating connection and in meshing with each other, an input shaft is in transmission connection with the input gear, and an output shaft is in transmission connection with the output gear;

[0010] A movable transmission shaft is in transmission connection with a vehicle power output shaft at one end and in rotating connection with the input shaft at the other end, a transmission clutch mechanism cooperating with the connection mode is arranged to switch the transmission relationship between the movable transmission shaft and the input shaft between the transmission connection and the rotating connection;

[0011] The transmission clutch mechanism comprises a static transmission wheel mounted on the input gear, and a sliding transmission part movably mounted on the end of the movable transmission shaft. In addition, an electric pusher is arranged on one side of the transmission clutch mechanism, which is used to push the sliding transmission part to slide inwards or outwards, so that the sliding transmission part is in contact with or separated from the static transmission wheel.

[0012] In a possible implementation, when the sliding transmission part is in contact with the static transmission wheel, the movable transmission shaft is in transmission connection with the input shaft, and the output shaft rotates to output torque. When the sliding transmission part is separated from the static transmission wheel, the movable transmission shaft is in rotation connection with the input shaft, and the output shaft stops rotating to interrupt the output.

[0013] In a possible implementation, the end of the movable transmission shaft close to the input shaft is provided with a transmission end head, and a connecting cavity is formed in the transmission end head. The end of the input shaft extends into the connecting cavity and is in rotation connection with the transmission end head through a bearing. The sliding transmission part comprises a sliding engagement cylinder which is slidably sleeved on the transmission end head and is in spline transmission connection with the transmission end head.

[0014] In a possible implementation, the static transmission wheel is provided with a plurality of engagement teeth arranged in a circumferential array, and the outer end of each engagement tooth is provided with a rounded corner. Correspondingly, the inner end of the sliding engagement cylinder is provided with a movable transmission wheel, and a plurality of engagement grooves corresponding to the engagement teeth are formed in the movable transmission wheel, and the opening of each engagement groove is provided with a rounded corner.

[0015] In a possible implementation, the electric pusher comprises a push-pull part mounted on a cover plate, and a transmission flap is connected to the shaft end of the push-pull part. The push-pull part can drive the transmission flap to move inwards or outwards, and a rolling push head is fixedly connected to the end of the transmission flap. Correspondingly, a matching disc is fixedly connected to the outer end of the sliding engagement cylinder, and part of the disc body is clamped in the rolling push head.

[0016] In a possible implementation, the rolling push head comprises a base, and two rolling shafts are mounted on the base. The matching disc is located between the two rolling shafts. When the matching disc is in contact with one of the rolling shafts, a gap is left between the matching disc and the other rolling shaft.

[0017] In a possible implementation, the cover plate is provided with two symmetrically arranged guide rods, and a sleeve is symmetrically arranged in the middle of the transmission flap. A through hole corresponding to the guide rod is formed in the sleeve, and the sleeve is in sliding connection with the guide rod.

[0018] In a possible implementation, the push-pull part is composed of an electric push rod and a closed shell sleeved on the outside of the electric push rod. In addition, a positioning flap is mounted on the cover plate, which is used to mount the push-pull part, and the closed shell of the push-pull part is detachably connected to the positioning flap.

[0019] In a possible implementation, the input shaft and the middle part of the output shaft are fixedly provided with a transmission shaft segment, which is connected with the input gear and the output gear by spline connection, and the two ends of the transmission shaft segment are bolted with anti-deviation plates abutting against the input gear and the output gear.

[0020] In a possible implementation, the cover plate is provided with a convex cylinder, the outer end of which is bolted with an end cover plate, and the end cover plate is bolted with a shaft cylinder; a plurality of bearings are coaxially arranged in the shaft cylinder to install and position the movable transmission shaft, and a bolted closing cover plate is arranged at the outer end of the shaft cylinder; a convex cover for accommodating the electric driving part is formed on the end cover plate, and a ring groove is formed in the connecting port of the device shell and the cover plate, and a sealing rubber ring is arranged in the ring groove.

[0021] In summary, the present application has the following beneficial technical effects:

[0022] Firstly, the transmission and clutch mechanism includes a static transmission wheel and a sliding transmission part, and the electric driving part arranged can automatically drive the sliding transmission part to slide in and out, so that the sliding transmission part immediately abuts against or separates from the static transmission wheel; when the sliding transmission part slides in and contacts and engages with the static transmission wheel, the movable transmission shaft is in transmission connection with the input shaft, at this time, the output shaft rotates to output torque, and when the sliding transmission part slides out and separates from the static transmission wheel, the movable transmission shaft is in rotational connection with the input shaft, at this time, the output shaft stops rotating to interrupt the output; this switching mode responds quickly, and since there is no sliding friction between the gear teeth, serious friction or jamming does not occur.

[0023] Secondly, for the static transmission wheel and the sliding transmission part, the transmission connection is achieved by the way that the engagement teeth are clamped into the engagement groove, and the outer end of the engagement teeth is processed with a round corner, and the groove opening of the engagement groove is processed with a round corner; based on the above structure, when meshing, even if the engagement teeth are not aligned with the high-speed rotating engagement groove, with the rotation and forward movement of the engagement groove, the engagement teeth will immediately slide into the engagement groove, ensuring the timeliness of the connection and reducing the wear; when separating, since the axial friction between the engagement teeth and the engagement groove is small, the separation can also be immediately achieved.

[0024] Thirdly, since the power transmission is controlled by the transmission and clutch mechanism, and is not achieved by the contact and separation of the input gear and the output gear, there is no axial sliding friction between the gears, which can prolong the service life of the gear teeth and ensure the stability of the meshing, and different forms of gears can be used to meet different needs, such as helical gears. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments thereof, and explain the present application, and do not constitute a limitation of the present application. In the drawings:

[0026] Figure 1The overall structure of the present application is shown in the schematic diagram.

[0027] Figure 2 The structure of the present application is shown in the schematic diagram.

[0028] Figure 3 The transmission clutch mechanism structure of the present application is shown in the schematic diagram.

[0029] Figure 4 The working state of the transmission clutch mechanism of the present application is shown in the schematic diagram.

[0030] Figure 5 The movable transmission shaft structure of the present application is shown in the schematic diagram.

[0031] Figure 6 The sliding transmission piece structure of the present application is shown in the schematic diagram.

[0032] Figure 7 The electrically operated knob structure of the present application is shown in the schematic diagram.

[0033] Figure 8 The electrically operated knob structure of the present application is shown in the schematic diagram.

[0034] Figure 9 The gear and shaft connection structure of the present application is shown in the schematic diagram.

[0035] Figure 10 The cover plate sealing structure of the present application is shown in the schematic diagram.

[0036] Figure 11 The cover plate structure of the present application is shown in the schematic diagram.

[0037] In the figure:

[0038] 1, device housing; 11, cover plate; 12, convex cylinder; 13, end cover plate; 131, convex cover; 14, shaft cylinder; 141, closure cover; 15, sealing rubber ring;

[0039] 21, input gear; 22, output gear; 201, transmission shaft section; 202, anti-deviation plate;

[0040] 3, input shaft; 4, output shaft;

[0041] 5, movable transmission shaft; 51, transmission end; 52, connection cavity;

[0042] 6, transmission clutch mechanism; 61, static transmission wheel; 611, engagement teeth; 62, sliding transmission piece; 621, sliding engagement cylinder; 622, dynamic transmission wheel; 623, engagement groove; 624, matching disc;

[0043] 7, electrically operated knob; 71, push-pull part; 72, transmission flap; 73, rolling knob; 731, base; 732, roller; 74, guide rod; 75, positioning flap. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application are to solve the problems in the background art, and the general idea is as follows:

[0045] The power output auxiliary driving device of the vehicle power device provided in the embodiment is shown in FIG. 1, and mainly includes a device shell 1, a cover plate 11 connected by bolts is arranged at the front end of the device shell 1, an input gear 21 and an output gear 22 are arranged in the device shell 1, both of which are rotatably installed in the device shell 1 and are in mesh with each other, an input shaft 3 is drivingly connected to the input gear 21, and an output shaft 4 is drivingly connected to the output gear 22, when the input shaft 3 is rotated under the action of torque, the input gear 21 drivingly connected to the input shaft 3 is rotated to drive the meshed output gear 22 to rotate, and finally the output shaft 4 is rotated to output the torque of the engine or the motor to drive other vehicle-mounted equipment such as a hydraulic pump to work. Figures 1-2

[0046] Since the positions of the input gear 21 and the output gear 22 are relatively fixed and cannot slide relative to each other, the friction between the input gear 21 and the output gear 22 is not severe, and the input gear 21 and the output gear 22 have a long service life, and gears with different teeth can be used for work.

[0047] However, the above structure can only realize the extraction and transmission of power, when the engine or the motor works, the device as a whole is in a working state all the time, and the power source is continuously extracted, so it is not possible to control the switching between the working state and the stop state, and the use is relatively rigid, therefore, it is necessary to add corresponding structures to control the on-off of the power transmission path, so as to make the use more convenient and energy-saving.

[0048] The transmission clutch mechanism 6 arranged can realize the above requirement, which is used to switch the transmission relationship between the movable transmission shaft 5 and the input shaft 3 between transmission connection and rotation connection, the transmission clutch mechanism 6 includes a static transmission wheel 61 installed on the input gear 21 and a sliding transmission piece 62 movably installed at the end of the movable transmission shaft 5, in addition, an electrically operated shifting piece 7 is arranged at one side of the transmission clutch mechanism 6, which is used to shift the sliding transmission piece 62 to slide in and out, so that the sliding transmission piece 62 is in contact with or separated from the static transmission wheel 61, when the two are in contact, the power extractor works and outputs power, when the two are separated, the power extractor stops working and does not output power, as shown in FIG. 2. Figures 3-4 When the sliding transmission piece 62 slides out and is separated from the static transmission wheel 61, the state changes from (a) to (b) in FIG. 3, when the sliding transmission piece 62 slides in and is in mesh with the static transmission wheel 61, the state changes from (b) to (a) in FIG. 3. Figure 4 Figure 4

[0049] ​​​In order to realize the above technical scheme, the following requirements need to be met:

[0050] First, the connection mode of the movable transmission shaft 5, one end of which is in transmission connection with the vehicle power output shaft, and the other end needs to be in rotational connection with the input shaft 3. Only in this way can the movable transmission shaft 5 not drive the input shaft 3 to rotate when the sliding transmission member 62 is separated from the static transmission wheel 61. Therefore, the end of the movable transmission shaft 5 close to the input shaft 3 is provided with a transmission end head 51, in which a connecting cavity 52 is formed. The end of the input shaft 3 extends into the connecting cavity 52 and is in rotational connection with the transmission end head 51 through a bearing, as shown in Figure 5 .

[0051] Secondly, the movable transmission shaft 5 needs to ensure transmission connection while being in sliding connection with the sliding transmission member 62. Therefore, the sliding transmission member 62 includes a sliding engagement cylinder 621, which is slidingly sleeved on the transmission end head 51 and is in spline transmission connection with the transmission end head 51, as shown in Figure 3 , Figure 5 .

[0052] Finally, the engagement and separation of the sliding transmission member 62 and the static transmission wheel 61 need to have the characteristics of being rapid and efficient, and there should be no severe friction and no structural jamming. Therefore, for the static transmission wheel 61 and the sliding transmission member 62, the transmission connection is realized by the way that the engaging teeth 611 are clamped into the engaging grooves 623, and the outer end of the engaging teeth 611 is processed with a rounded corner, and the groove opening of the engaging grooves 623 is processed with a rounded corner. Based on the above structure, even if the engaging teeth 611 are not aligned with the high-speed rotating engaging grooves 623, the engaging teeth 611 will immediately slide into the engaging grooves 623 as the engaging grooves 623 rotate and move forward, ensuring the timeliness of the connection and reducing wear. When separated, the engaging teeth 611 and the engaging grooves 623 have small axial friction, and can be immediately separated, as shown in Figure 3 , Figure 6 .

[0053] The electric drive member 7, which is the power source of the transmission and clutch mechanism 6, includes a push-pull member 71 mounted on the cover plate 11, the shaft end of which is connected with a transmission flap 72, the end of which is fixedly connected with a rolling drive head 73, which includes a base 731, on which two rolling rollers 732 are mounted. As a match, the outer end of the sliding engagement cylinder 621 is fixedly connected with a matching disc 624, which is located between the two rollers 732. The push-pull member 71 can drive the transmission flap 72 to move in and out, and then drive the sliding transmission member 62 to move as a whole by pushing and pulling the matching disc 624 through the rollers 732, so as to control the contact and separation of the sliding transmission member 62 and the static transmission wheel 61, as shown in Figures 7-8As shown, in the above structure, since the roller 732 and the mating disc 624 are in rolling contact, there will be no significant friction and no waste of power.

[0054] To further reduce the friction between the roller 732 and the mating disc 624, the following condition must be met: when the mating disc 624 contacts one side of the roller 732, a gap remains between it and the other side of the roller 732. This condition ensures that when the corresponding roller 732 pushes the mating disc 624 to its two extreme positions and fixes it, the other side of the roller 732 does not contact it, thereby further reducing friction.

[0055] In addition, to prevent the roller 732 from shifting due to positional deviation of the transmission flap 72 during movement, two symmetrically arranged guide rods 74 are provided on the cover plate 11, and a symmetrically arranged sleeve is provided in the middle of the transmission flap 72, which has through holes corresponding to the guide rods 74. The sleeve and the guide rods 74 are slidably connected. This structure can limit and guide the movement of the transmission flap 72 and prevent it from shifting during movement.

[0056] like Figures 7-8 As shown, the push-pull component 71 consists of an electric push rod and a closed housing fitted over it; in addition, a positioning folding plate 75 is installed on the cover plate 11 for mounting the push-pull component 71, and it is detachably connected to the closed housing of the push-pull component 71.

[0057] Since the input gear 21 and output gear 22 are easily worn parts, it is best for both to be detachable for easy replacement. Therefore, a transmission shaft section 201 is fixedly installed in the middle of both the input shaft 3 and the output shaft 4. This section is splined to the input gear 21 and output gear 22, and both ends of the transmission shaft section 201 are bolted with anti-deviation plates 202 that fit against the input gear 21 and output gear 22. This structural form uses the transmission shaft section 201 to achieve the transmission connection, and the anti-deviation plates 202 to provide positioning and fixation, making disassembly relatively convenient. Figure 9 As shown.

[0058] like Figures 10-11As shown, the cover plate 11 is provided with a convex cylinder 12, the outer end of which is bolted with an end cover plate 13, and the end cover plate 13 is bolted with a shaft cylinder 14; wherein the shaft cylinder 14 is provided with a plurality of coaxially arranged bearings for installing and positioning the movable transmission shaft 5, and the outer end cover of the shaft cylinder 14 is provided with a bolted closing cover plate 141, and the end cover plate 13 is processed to form a convex cover 131 for accommodating the electric driving part 7, and the connecting port of the device shell 1 and the cover plate 11 is provided with a ring groove, wherein a sealing rubber ring 15 is arranged, and the above structure can form a shell protection part with positioning and fixing effect, which can position and install and protect the internal structure, and has strong detachability, and can facilitate the disassembly and maintenance of the whole device.

[0059] The use principle and use process of the present application are as follows:

[0060] When the input shaft 3 is rotated under the action of torque, the input gear 21 connected in transmission with the input shaft 3 is driven to rotate, thereby driving the meshed output gear 22 to rotate, and finally realizing the rotation of the output shaft 4 to output the torque of the engine or motor to drive other vehicle-mounted equipment to work, such as a hydraulic pump.

[0061] The transmission and clutch mechanism 6 includes a static transmission wheel 61 and a sliding transmission part 62, and the electric driving part 7 arranged therein can automatically drive the sliding transmission part 62 to slide in and out, so that it immediately adheres to or separates from the static transmission wheel 61; when the sliding transmission part 62 slides in and contacts and engages with the static transmission wheel 61, the movable transmission shaft 5 is in transmission connection with the input shaft 3, at this time the output shaft 4 rotates to output torque, when the sliding transmission part 62 slides out and separates from the static transmission wheel 61, the movable transmission shaft 5 is in rotational connection with the input shaft 3, at this time the output shaft 4 stops rotating and interrupts the output, this switching mode responds quickly, and since there is no sliding friction between the gear teeth, it will not appear serious friction or jamming.

[0062] In actual operation, when the device needs to input power, the control push-pull part 71 is operated to drive the roller shaft 732 to move and tightly contact with the cooperating disc 624, and to push it inward to realize the inward pushing of the sliding transmission part 62, and the transmission wheel 622 will rotate and move forward at the same time, when contacting with the engagement tooth 611, the engagement tooth 611 will immediately slide into the engagement groove 623 to realize the engagement of the sliding transmission part 62 and the static transmission wheel 61; when the power output needs to be cut off, the control push-pull part 71 is operated to make the roller shaft 732 on the other side tightly contact with the cooperating disc 624 and push it outward to realize the outward pushing of the sliding transmission part 62, at this time the engagement groove 623 and the engagement tooth 611 are separated, and since the movable transmission shaft 5 is in rotational connection with the input shaft 3 through the bearing, at this time the power cannot be output.

[0063] It should be noted that the above-mentioned embodiments are merely used to clearly illustrate the technical solutions of the present application, and should not be construed as limitations to the present application. Based on the above-mentioned embodiments, those skilled in the art can make other variations or modifications without departing from the spirit of the present application. The present application is not required to enumerate all of the embodiments, and the variations or modifications made without departing from the spirit of the present application should fall within the scope of the present application.

Claims

1. A power output auxiliary drive device of a vehicle power plant, characterized by comprising: The utility model relates to a kind of transmission and clutch mechanism, including: Device shell (1), its front end cover is equipped with bolt connection cover plate (11); Input gear (21) and output gear (22), both are rotationally installed in device shell (1), and both are engaged with each other, wherein, input gear (21) is drivenly connected with input shaft (3), and output gear (22) is drivenly connected with output shaft (4); Movable transmission shaft (5), one end is drivingly connected with vehicle power output shaft, the other end is rotationally connected with input shaft (3); Transmission and clutch mechanism (6), it is used to switch the transmission relationship between movable transmission shaft (5) and input shaft (3) between transmission connection and rotation connection; Wherein, the transmission and clutch mechanism (6) includes static transmission wheel (61) installed on input gear (21), and sliding transmission part (62) movably installed in the end of movable transmission shaft (5), in addition, electrically operated piece (7) is located in the side position of transmission and clutch mechanism (6), it is used to push sliding transmission part (62) in and out sliding, make it and static transmission wheel (61) adhere or separate;When sliding transmission part (62) is in sliding and static transmission wheel (61) contact engagement, movable transmission shaft (5) and input shaft (3) are transmission connected, when output shaft (4) rotates output torque at this time, when sliding transmission part (62) is out sliding and static transmission wheel (61) is separated, movable transmission shaft (5) and input shaft (3) are rotationally connected, when output shaft (4) stops rotating and interrupts output at this time; The end of the movable transmission shaft (5) close to the input shaft (3) is provided with a transmission end (51), and a connecting cavity (52) is formed in the transmission end (51), the end of the input shaft (3) extends into the connecting cavity (52) and is rotationally connected with the transmission end (51) through a bearing; The static transmission wheel (61) is provided with a plurality of circumferentially arranged engagement teeth (611), and the outer end of each engagement tooth (611) is rounded; The electrically operated piece (7) includes a push-pull component (71) mounted on the cover plate (11), and a transmission flap (72) is connected to the shaft end of the push-pull component (71), the push-pull component (71) can drive the transmission flap (72) to move in and out, and a rolling knob (73) is fixedly connected to the end of the transmission flap (72), the outer end of the sliding engagement cylinder (621) is fixedly connected with a matching disc (624), and the matching disc (624) is clamped in the rolling knob (73); The rolling knob (73) includes a base (731), and two rolling shafts (732) are mounted on the base (731), and the matching disc (624) is located between the two rolling shafts (732), and when the matching disc (624) contacts one of the rolling shafts (732), a gap is left between the other rolling shaft (732). Two symmetrical guide rods (74) are arranged on the cover plate (11), and a sleeve with a through hole corresponding to the guide rod (74) is arranged in the middle of the transmission flap (72), and the sleeve is in sliding connection with the guide rod (74).

2. A power output assist drive for a vehicle power plant as claimed in claim 1, characterised in that: The push-pull part (71) is composed of an electric push rod and a closed shell sleeved outside the electric push rod; The cover plate (11) is provided with a positioning flap (75) for mounting the push-pull part (71), and the positioning flap (75) is detachably connected with the closed shell of the push-pull part (71).

3. A power output assist drive for a vehicle power plant as claimed in claim 1, characterised in that: The middle part of the input shaft (3) and the output shaft (4) is fixedly provided with a transmission shaft section (201), which is connected with the input gear (21) and the output gear (22) by spline connection, and the both ends of the transmission shaft section (201) are bolted with anti-deviation plates (202) abutting against the input gear (21) and the output gear (22).

4. The power output auxiliary drive device for a vehicle power unit according to claim 1, characterized in that: The cover plate (11) is provided with a convex cylinder (12), the outer end of which is bolted with an end cover plate (13), and the end cover plate (13) is bolted with a shaft cylinder (14); The shaft cylinder (14) is provided with a plurality of coaxially arranged bearings for mounting the positioning movable transmission shaft (5), and the outer end cover of the shaft cylinder (14) is provided with a bolted closing cover plate (141); The end cover plate (13) is processed to form a convex cover (131) for accommodating the electric push part (7); The connecting port of the device shell (1) and the cover plate (11) is provided with a ring groove, and a sealing rubber ring (15) is arranged in the ring groove.

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