Manual gear shifting power take-off device

Abstract

The utility model discloses a manual gear shifting power take-off device which can better adapt to a high-speed and heavy-load power take-off scene, can prevent a power take-off gear from abnormally moving and vibrating in the power take-off process, and can enable the axial moving trend of the power take-off gear to be reasonably eliminated, so that the stability of the power take-off process can be fully guaranteed. The main structure comprises a power take-off shell, a power take-off gear, a gear shifting shaft, a shifting fork, a power take-off gear sleeve, an output shaft and a power take-off shaft, a gear shifting rocker arm is arranged outside the power take-off shell, a gear shifting block is arranged on the gear shifting shaft, an output linkage gear and a driven gear are arranged on the output shaft, the output linkage gear is fixed to the output shaft, and the power take-off gear sleeve is in sliding connection with the driven gear. The power take-off gear is meshed with the driven gear, the power take-off gear is a bevel gear, the power take-off shaft is sleeved with a thrust pad and a sleeve, the thrust pad and the power take-off shell are relatively fixed, the sleeve comprises a barrel body and a flanging ring, the power take-off gear is rotationally connected with the barrel body, and the flanging ring, the power take-off gear and the thrust pad are sequentially arranged in the axial direction of the power take-off shaft.

Description

TECHNICAL FIELD

[0001] The utility model belongs to vehicle transmission, power take-off device technical field, especially relates to a manual gear shifting power take-off device. BACKGROUND

[0002] The power take-off device is mainly installed on the automobile engine, transmission or power divider, and is a key component for connecting the power source and the working device. In other words, the power take-off gear of the power take-off device is directly connected (meshed) with a certain gear on the automobile engine, transmission or power divider for power take-off, and then the power is transmitted to the external working device (such as a mixer, an impeller pump, etc.). However, under the condition of high speed and heavy load, the power take-off gear of the traditional power take-off device is prone to rapid gear wear and rapid decline in stability during operation. CONTENT

[0003] The utility model provides a manual gear shifting power take-off device, utilize the helical gear as the power take-off gear, can better adapt to the power take-off scene of high speed and heavy load, and use sleeve and thrust washer as the axial positioning structure of power take-off gear, can prevent the abnormal movement and vibration of power take-off gear during power take-off, and can also reasonably eliminate the axial movement trend of power take-off gear, so as to fully guarantee the stability of the power take-off process.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A manual gear shifting power take-off device, comprising a power take-off housing, a power take-off gear, a gear shift shaft slidingly connected to the power take-off housing, a shift fork driven by the gear shift shaft, a power take-off sleeve driven by the shift fork, an output shaft rotatably connected to the power take-off housing, and a power take-off shaft rotatably connected to the power take-off housing;

[0006] The power take-off housing is provided with a gear shift rocker arm that can rotate relative to the power take-off housing, the gear shift shaft is provided with a gear shift block driven by the gear shift rocker arm, the output shaft is provided with an output gear that can be combined with the power take-off sleeve and a driven gear rotatably connected to the output shaft, the output gear is fixed to the output shaft, the power take-off sleeve is slidingly connected to the driven gear, and the power take-off gear is meshed with the driven gear;

[0007] The power take-off gear is a helical gear, a thrust washer and a sleeve that is fixed relative to the power take-off shaft are sleeved on the power take-off shaft, the thrust washer is fixed relative to the power take-off housing, the sleeve includes a cylinder body and a flange ring, the power take-off gear is rotatably connected to the cylinder body, the flange ring, the power take-off gear and the thrust washer are arranged in sequence along the axial direction of the power take-off shaft, the power take-off gear and the flange ring are in sliding contact, and the power take-off gear and the thrust washer are in sliding contact.

[0008] As a preferred embodiment, the thrust washer is provided with an anti-rotation protrusion, the power take-off housing is provided with a groove matched with the anti-rotation protrusion, the thrust washer is provided with a plurality of oil containing grooves, and the grooves of the oil containing grooves face the power take-off gear.

[0009] As preferred, the power take-off housing is provided with an arm seat, the shift rocker middle part is rotationally connected with the arm seat, the shift pawl is fixed with the shift shaft, the shift pawl is provided with a plastic slider in sliding connection with the shift pawl, the plastic slider is provided with a through hole, the through hole is provided with a shift shaft fixed with one end of the shift rocker, the shift shaft axis is parallel to the through hole axis, and the shift shaft diameter is smaller than the through hole diameter.

[0010] As preferred, the shift shaft is provided with a first positioning groove and a second positioning groove, the first positioning groove and the second positioning groove are connected through a transition surface, and the shift structure further comprises a positioning structure, the positioning structure comprises a positioning cylinder fixed opposite to the power take-off housing, a positioning spring arranged in the positioning cylinder, and an inner cylinder in sliding connection with the positioning cylinder, the inner cylinder is provided with a positioning ball at the lower end, one end of the inner cylinder is fixed opposite to the positioning spring, the other end of the positioning spring is fixed opposite to the positioning cylinder, and the positioning spring, the center of the positioning ball, the transition surface and the shift shaft axis are sequentially arranged along the positioning spring axis.

[0011] When the lower end of the positioning ball is in the first positioning groove, the output gear teeth are separated from the power take-off gear sleeve.

[0012] When the lower end of the positioning ball is in the second positioning groove, the output gear teeth are combined with the power take-off gear sleeve.

[0013] As preferred, the shift shaft is provided with an elastic dust cover, the power take-off housing is provided with a housing hole for the shift shaft to pass through, the elastic dust cover is sleeved on the shift shaft, the elastic dust cover is provided with a small hole in communication with the atmosphere, and in the shift shaft axial direction: one end of the elastic dust cover is sealingly fixed between the housing hole, and the other end of the elastic dust cover is a dust-proof outer end outside the power take-off housing, and the dust-proof outer end is sealingly fixed with the outer side wall of the shift shaft.

[0014] As preferred, the power take-off shaft comprises a small-diameter section and a large-diameter section, the cylinder body is sleeved on the small-diameter section, the sleeve is provided with an inner groove, one end face of the flange ring is attached to the end face of the large-diameter section, the small-diameter section is provided with an outer groove, and the steel ball is partially arranged in the inner groove and partially arranged in the outer groove, the steel ball is fixed opposite to the inner groove, and the steel ball is fixed opposite to the outer groove.

[0015] The utility model discloses a helical gear is used as the power take-off gear, thereby better adapt to the high -speed heavy -duty power take-off scene, and use sleeve and thrust washer as the axial positioning structure of power take-off gear, can prevent the abnormal movement, vibration of power take-off gear in the power take-off process, can make the axial movement trend of power take-off gear be reasonably resolved, thereby can fully guarantee the stability of the power take-off process, and the thrust washer is provided with anti -rotation convex and oil -containing groove, is favorable to dismounting replacement, is favorable to forming oil film, can reduce resistance, and relieve friction. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1It is a structure schematic view of the utility model;

[0017] Figure 2 It is Figure 1 The enlarged view of A in figure 1 is shown in figure 2;

[0018] Figure 3 It is a structure schematic view of the utility model thrust pad place;

[0019] Figure 4 It is Figure 1 The enlarged view of B in figure 1 is shown in figure 3;

[0020] Figure 5 It is Figure 1 The enlarged view of C in figure 1 is shown in figure 4.

[0021] The drawing reference: power take-off shell 1, power take-off gear 2, power take-off shaft 201, small diameter section 201.1, outer groove 201.1a, large diameter section 201.2, thrust pad 202, oil containing groove 202a, anti-rotation protrusion 202.1, sleeve 203, inner groove 203a, barrel 203.1, flange ring 203.2, steel ball 204, power take-off needle bearing 205, shift shaft 3, first positioning groove 3a, second positioning groove 3b, shift fork 301, power take-off gear sleeve 302, output shaft 4, output gear 401, driven gear 402, shift rocker arm 5, shift block 501, arm seat 502, plastic slider 503, through hole 503a, shift shaft 504, positioning cylinder 601, positioning spring 602, inner cylinder 603, positioning ball 604, elastic dust cover 7. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0023] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 shown,

[0024] A manual shift power take-off device, comprising a power take-off shell 1, a power take-off gear 2, a shift shaft 3 in sliding connection with the power take-off shell 1, a shift fork 301 driven by the shift shaft 3, a power take-off gear sleeve 302 driven by the shift fork 301, an output shaft 4 in rotational connection with the power take-off shell 1 and a power take-off shaft 201 in rotational connection with the power take-off shell 1;

[0025] The power take-off casing 1 is externally provided with a gear shifting rocker arm 5 which can rotate relative to the power take-off casing 1, the gear shifting shaft 3 is provided with a gear shifting block 501 which is driven by the gear shifting rocker arm 5, the output shaft 4 is provided with an output connecting gear 401 which can be combined with the power take-off gear sleeve 302 and a driven gear 402 which is rotationally connected with the output shaft 4, the output connecting gear 401 is fixed with the output shaft 4, the power take-off gear sleeve 302 is slidingly connected with the driven gear 402, the power take-off gear 2 is meshed with the driven gear 402;

[0026] The power take-off gear 2 is a helical gear, the power take-off shaft 201 is provided with a thrust washer 202 and a sleeve 203 which is fixed relative to the power take-off shaft 201, the thrust washer 202 is fixed relative to the power take-off casing 1, the sleeve 203 comprises a cylinder 203.1 and a flange ring 203.2, the power take-off gear 2 is rotationally connected with the cylinder 203.1, the flange ring 203.2, the power take-off gear 2 and the thrust washer 202 are sequentially arranged along the power take-off shaft 201 in the axial direction, the power take-off gear 2 and the flange ring 203.2 are in sliding contact, the power take-off gear 2 and the thrust washer 202 are in sliding contact. The power take-off gear sleeve 302 is provided with an outer ring groove, one end of the yoke 301 is located in the outer ring groove. The driven gear 402 is rotationally connected with the output shaft 4 through a driven gear needle bearing. The power take-off gear 2 is rotationally connected with the cylinder 203.1 through a power take-off needle bearing 205. The power take-off gear 2 and the thrust washer 202 are in mutual extrusion.

[0027] Background art The power take-off gear 2 of the power take-off device is directly coupled (meshed) with a gear on the automobile engine, transmission or transfer to take power. The gear shifting rocker arm 5 can drive the gear shifting block 501 to move, that is, the gear shifting shaft 3 can be axially moved. The gear shifting shaft 3 moves with the yoke 301, the yoke 301 drives the power take-off gear sleeve 302 to move so that the power take-off gear sleeve 302 is combined with the output connecting gear 401, so that power can be transmitted along the power take-off gear 2, the driven gear 402, the power take-off gear sleeve 302, the output connecting gear 401 and the output shaft 4, thereby completing the power taking. When it is needed to end the power taking, the gear shifting rocker arm 5 can drive the gear shifting block 501 to move, so that the gear shifting shaft 3 moves with the yoke 301, the yoke 301 drives the power take-off gear sleeve 302 to move so that the power take-off gear sleeve 302 is separated from the output connecting gear 401.

[0028] In the high-speed heavy-load working condition, the straight-tooth meshing structure is prone to have the defects of gear wear, increased noise and vibration, and decreased transmission efficiency due to its low coincidence degree. In the present scheme, the helical gear is used as the power take-off gear 2, which can significantly improve the above problems. At the same time, the helical gear also brings some problems, that is, the helical gear will be subjected to a relatively large axial force, so the power take-off gear 2 has a tendency to move axially.

[0029] The sleeve 203 and the thrust washer 202 are arranged in the scheme, the flange ring 203.2 in the sleeve 203 limits one end of the power take-off gear 2, and the thrust washer 202 is used to limit the other end of the power take-off gear 2. The power take-off gear 2 is affected by the axial force and has a tendency to move towards the side of the thrust washer 202. Therefore, the power take-off gear 2 and the thrust washer 202 are in sliding contact and are pressed against each other. The material of the thrust washer 202 can be the same as the material used for the bushing on the structure of the transmission, the transfer case and the like, such as copper-tin alloy, copper-zinc alloy and the like. Compared with the power take-off housing 1 which is usually made of aluminum or aluminum alloy and the like, the thrust washer 202 has better wear resistance and can protect the power take-off housing 1 and ensure the stability of the power take-off gear 2 during operation. Moreover, replacing the thrust washer 202 is more convenient and low-cost than repairing the power take-off gear 2 and the power take-off housing 1. In addition, the thrust washer 202 is relatively fixed with the power take-off housing 1, which can prevent the thrust washer 202 from rotating and avoid the wear of the thrust washer 202 to the power take-off housing 1.

[0030] The thrust washer 202 is provided with an anti-rotation protrusion 202.1, the power take-off housing 1 is provided with a groove matched with the anti-rotation protrusion 202.1, and the thrust washer 202 is provided with a plurality of oil containing grooves 202a, and the groove of the oil containing groove 202a faces the power take-off gear 2.

[0031] The anti-rotation protrusion 202.1 and the groove are matched to limit the rotation of the thrust washer 202, avoid the wear of the thrust washer 202 to the power take-off housing 1, and also facilitate the assembly of the thrust washer 202. The oil containing groove 202a can relatively contain more lubricating oil, which is more conducive to forming an oil film between the thrust washer 202 and the power take-off gear 2, thereby reducing the resistance and relieving the friction, and ensuring the stability of the power take-off gear 2 during operation.

[0032] The power take-off housing 1 is provided with an arm seat 502, the middle part of the shift rocker arm 5 is rotationally connected with the arm seat 502, the shift block 501 is fixed with the shift shaft 3, the shift block 501 is provided with a plastic sliding block 503 in sliding connection with the shift block 501, the plastic sliding block 503 is provided with a through hole 503a, the through hole 503a is provided with a shift shaft 504 fixed with one end of the shift rocker arm 5, the shaft line of the shift shaft 504 is parallel to the shaft line of the through hole 503a, and the diameter of the shift shaft 504 is smaller than the diameter of the through hole 503a. The sliding direction of the plastic sliding block 503 is perpendicular to the shift shaft 3.

[0033] The middle part of the shift rocker arm 5 is rotationally connected with the arm seat 502, and the shift rocker arm 5 can rotate. Figure 1As shown in the middle perspective, when the shift rocker arm 5 rotates and the upper end of the shift rocker arm 5 moves to the left, the shift shaft 504 in the through hole 503a will also push the plastic slider 503 to move to the left (the diameter of the shift shaft 504 is smaller than the diameter of the through hole 503a), and the plastic slider 503 drives the shift paddle block 501 to move to the left (at the same time, the plastic slider 503 will move up and down relative to the shift paddle block 501), so that the shift shaft 3 can move to the left. The same applies when the shift shaft 3 moves to the right.

[0034] The shift shaft 3 is provided with a first positioning groove 3a and a second positioning groove 3b, and the notch of the first positioning groove 3a and the notch of the second positioning groove 3b are connected by a transition surface. The shift shaft 3 also includes a positioning structure, which includes a positioning cylinder 601 fixed relatively to the power take-off housing 1, a positioning spring 602 provided in the positioning cylinder 601, and an inner cylinder 603 slidably connected to the positioning cylinder 601. A positioning ball 604 is provided at the lower end of the inner cylinder 603. The inner cylinder 603 is relatively fixed to one end of the positioning spring 602, and the other end of the positioning spring 602 is relatively fixed to the positioning cylinder 601. The positioning spring 602, the center of the positioning ball 604, the transition surface, and the axis of the shift shaft 3 are arranged in sequence along the axial direction of the positioning spring 602.

[0035] When the lower end of the positioning ball 604 is in the first positioning groove 3a, the output coupling gear 401 is separated from the power take-off gear sleeve 302;

[0036] When the lower end of the positioning ball 604 is located in the second positioning groove 3 b , the output coupling gear 401 is engaged with the power take-off gear sleeve 302 .

[0037] The positioning ball 604 cooperates with the first or second positioning groove 3a, 3b to position the present invention in either the power take-off or non-power take-off position. When the shift shaft 3 moves and the positioning ball 604 leaves the first or second positioning groove 3a, 3b, the positioning spring 602 further compresses. After the positioning ball 604 passes through the transition surface and enters the second or first positioning groove 3b, the positioning spring 602 extends again, pushing the positioning ball 604 back into the second or first positioning groove 3b.

[0038] The shift shaft 3 is provided with an elastic dust cover 7, and the power take-off housing 1 is provided with a housing hole for the shift shaft 3 to pass through. The elastic dust cover 7 is sleeved on the shift shaft 3, and the elastic dust cover 7 is provided with a small hole connected to the atmosphere. In the axial direction of the shift shaft 3: one end of the elastic dust cover 7 is sealed and fixed to the housing hole, and the other end of the elastic dust cover 7 is a dust-proof outer end outside the power take-off housing 1, and the dust-proof outer end is sealed and fixed to the outer wall of the shift shaft 3.

[0039] The dust cover can protect the housing hole and the inside of the power take-off housing 1 from dust and debris. When the shift shaft 3 moves, the dust cover is deformed and its internal space changes. The small hole can balance the air pressure in the dust cover.

[0040] The power take-off shaft 201 comprises a small-diameter section 201.1 and a large-diameter section 201.2, the sleeve 203.1 is sleeved on the small-diameter section 201.1, the sleeve 203 is provided with an inner groove 203a, one end face of the flange ring 203.2 is attached to the end face of the large-diameter section 201.2, the small-diameter section 201.1 is provided with an outer groove 201.1a, and further comprises a steel ball 204, a part of the steel ball 204 is located in the inner groove 203a, a part of the steel ball 204 is located in the outer groove 201.1a, the steel ball 204 is relatively fixed with the inner groove 203a, and the steel ball 204 is relatively fixed with the outer groove 201.1a.

[0041] The cooperation of the steel ball 204 and the outer groove 201.1a, the cooperation of the steel ball 204 and the inner groove 203a, and the cooperation of the flange ring 203.2 and the large-diameter section 201.2 can realize the cooperation positioning between the sleeve 203 and the power take-off shaft 201, so that the stability of the working process can be ensured, and the disassembly and maintenance of the sleeve 203 and other structures are facilitated.

[0042] The above has introduced the embodiments of the utility model in detail, the principle and implementation mode of the utility model have been described by applying specific examples in this paper, the above embodiment is only for helping understanding the method and core thought of the utility model; simultaneously, for the technical personnel in the art, according to the thought of the utility model, there will be changes in specific implementation mode and application range, and the above-mentioned, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A manually shifted power take-off device characterized by, The power take-off shell, the power take-off gear, the shift shaft in sliding connection with the power take-off shell, the shift fork driven by the shift shaft, the power take-off gear sleeve driven by the shift fork, the output shaft in rotary connection with the power take-off shell and the power take-off shaft in rotary connection with the power take-off shell are included. The power take-off shell is externally provided with a shift rocker in rotary connection with the power take-off shell, the shift shaft is provided with a shift block driven by the shift rocker, the output shaft is provided with an output gear in combination with the power take-off gear sleeve and a driven gear in rotary connection with the output shaft, the output gear is fixed with the output shaft, the power take-off gear sleeve is in sliding connection with the driven gear, and the power take-off gear is in mesh with the driven gear. The power take-off gear is a helical gear, the power take-off shaft is provided with a thrust washer and a sleeve in opposite fixed connection with the power take-off shaft, the thrust washer is in opposite fixed connection with the power take-off shell, the sleeve includes a cylinder and a flange ring, the power take-off gear is in rotary connection with the cylinder, the flange ring, the power take-off gear and the thrust washer are sequentially arranged along the axial direction of the power take-off shaft, the power take-off gear is in sliding contact with the flange ring, and the power take-off gear is in sliding contact with the thrust washer.

2. A manually shifted power takeoff as defined in claim 1, characterized in that The thrust washer is provided with an anti-rotation protrusion, the power take-off shell is provided with a groove in cooperation with the anti-rotation protrusion, the thrust washer is provided with a plurality of oil containing grooves, and the grooves of the oil containing grooves are towards the power take-off gear.

3. A manual shift power takeoff as defined in claim 1, characterized in that The power take-off shell is provided with an arm seat, the middle part of the shift rocker is in rotary connection with the arm seat, the shift block is fixed with the shift shaft, the shift block is provided with a plastic slider in sliding connection with the shift block, the plastic slider is provided with a through hole, the through hole is provided with a shift shaft fixed with one end of the shift rocker, the axis of the shift shaft is parallel to the axis of the through hole, and the diameter of the shift shaft is smaller than the diameter of the through hole.

4. A power take-off device according to claim 1 or 2 or 3, characterised in that, The shift shaft is provided with a first positioning groove and a second positioning groove, the groove opening of the first positioning groove is connected with the groove opening of the second positioning groove through a transition surface, and the positioning structure includes a positioning cylinder in opposite fixed connection with the power take-off shell, a positioning spring in the positioning cylinder and an inner cylinder in sliding connection with the positioning cylinder, the lower end of the inner cylinder is provided with a positioning ball, one end of the inner cylinder is in opposite fixed connection with the positioning spring, the other end of the positioning spring is in opposite fixed connection with the positioning cylinder, the positioning spring, the ball center of the positioning ball, the transition surface and the axis of the shift shaft are sequentially arranged along the axial direction of the positioning spring. When the lower end of the positioning ball is in the first positioning groove, the output gear is separated from the power take-off gear sleeve. When the lower end of the positioning ball is in the second positioning groove, the output gear is combined with the power take-off gear sleeve.

5. A manual shift power takeoff as defined in claim 1, characterized by The shift shaft is provided with an elastic dust cover, the power take-off shell is provided with a shell hole for the shift shaft to pass through, the elastic dust cover is sleeved on the shift shaft, the elastic dust cover is provided with a small hole in communication with the atmosphere, and in the axial direction of the shift shaft: one end of the elastic dust cover is sealingly fixed with the shell hole, and the other end of the elastic dust cover is a dustproof outer end outside the power take-off shell, and the dustproof outer end is sealingly fixed with the outer side wall of the shift shaft.

6. A power take-off device according to claim 1 or 2 or 3, characterized in that The power take-off shaft includes a small diameter section and a large diameter section, the cylinder is sleeved on the small diameter section, the sleeve is provided with an inner groove, one end face of the flange ring is attached to the end face of the large diameter section, the small diameter section is provided with an outer groove, and a steel ball is included, a part of the steel ball is in the inner groove, a part of the steel ball is in the outer groove, the steel ball is in opposite fixed connection with the inner groove, and the steel ball is in opposite fixed connection with the outer groove.

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