Wet brake hub reduction assembly and new energy transmission equipment

Abstract

The utility model provides a wet brake hub reduction assembly and new energy transmission equipment, and relates to the field of new energy automobiles. The wet brake hub reduction assembly comprises a half shaft, a supporting shaft, a hub, a hub reduction gear shell, a sun gear, a planet carrier, a planet gear and a brake mechanism. The half shaft is installed on the supporting shaft, and the sun gear is connected with the half shaft. The hub and the hub reduction gear shell are both rotationally matched with the supporting shaft. And an inner gear ring is arranged on the hub reduction shell. The planet carrier is installed on the supporting shaft, the planet wheel is installed on the planet carrier, and the planet wheel is meshed with the sun wheel and the inner gear ring at the same time. The braking mechanism comprises a braking oil cylinder, a braking piston and a friction plate set, and the supporting shaft is sleeved with the braking oil cylinder. The brake piston is connected to the brake oil cylinder in a sleeved mode and matched with the brake oil cylinder in a sliding mode in the axial direction of the supporting shaft, and the friction plate set is arranged between the brake piston and the hub. The inner gear ring and the brake oil cylinder are independently designed, so that the structure is simplified, the machining cost is reduced, stress is simplified, and the operation stability is improved.

Description

Technical Field

[0001] The utility model relates to the field of new energy, and more specifically, to a wet braking wheel side reduction assembly and a new energy transmission device. Background Technique

[0002] With the continuous iteration and upgrading of large vehicles such as construction machinery and agricultural machinery, especially after the transition from fuel power to new energy power, the torque borne by the transmission system has been greatly improved. The reduction structure and braking structure of the axle need to be as close to the wheel hub as possible. Therefore, the reliability of the wheel side reducer becomes increasingly important. Whether it is a traditional fuel transmission device or a wet braking wheel side reduction assembly of the drive axle of a new energy transmission device, the general transmission method is that the half shaft inputs torque to the sun gear, and the sun gear drives the planet gear to rotate. The ring gear is fixed on the support shaft. Under the restriction of the ring gear, the planet gear rotates around the sun gear while rotating on its own axis, thereby driving the planet gear carrier on which the planet gear is installed to rotate. The planet gear carrier is connected to the wheel hub, thereby driving the wheel hub to rotate. At the same time, the general braking method of the existing wheel side reduction assembly is that hydraulic oil enters the cavity between the ring gear and the piston, pushing the piston to press the dynamic friction plate and the static friction plate to achieve vehicle braking. In this way, the ring gear is simultaneously subjected to the axial force during braking and the radial force during torque transmission by the planetary gear, with complex forces, high requirements for the strength and machining accuracy of parts, and high machining and manufacturing costs. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a wet braking wheel side reduction assembly and a new energy transmission device, which can simplify the structure, reduce the machining difficulty, improve the machining efficiency, and reduce the machining cost.

[0004] The embodiments of the utility model are implemented as follows:

[0005] In a first aspect, the utility model provides a wet braking wheel side reduction assembly, including:

[0006] A half shaft, a support shaft, a wheel hub, a wheel side reducer housing, a sun gear, a planet carrier, a planet gear, and a braking mechanism;

[0007] The half shaft is rotatably installed on the support shaft; the wheel hub is connected to the wheel side reducer housing and is rotatably matched with the support shaft; an internal gear ring surrounding the half shaft is provided on the inner wall surface of the wheel side reduction housing; the sun gear is connected to the half shaft, the planet carrier is installed on the support shaft, the planet gear is rotatably installed on the planet carrier, and the planet gear meshes with both the sun gear and the internal gear ring;

[0008] The braking mechanism includes a brake cylinder, a brake piston and a friction plate group. The brake cylinder is sleeved on the support shaft and is located between the internal gear ring and the wheel hub; the brake piston is sleeved on the brake cylinder and is slidably matched with the brake cylinder in the axial direction of the support shaft, and the friction plate group is arranged between the brake piston and the wheel hub.

[0009] In an alternative embodiment, the wheel side reducer housing includes a housing main body and an end cover. The housing main body has a first opening and a second opening arranged at intervals in the axial direction of the support shaft. The wheel hub is installed in the first opening, the end cover is detachably installed in the second opening, and the internal gear ring is located on one side of the wheel hub close to the second opening.

[0010] Based on the above solution, by setting the wheel side reducer housing as a split structure, a second opening that can be opened and closed is provided on the side of the housing main body away from the wheel hub. When the end cover is removed and the second opening is opened, it is beneficial to perform operations such as inspection and maintenance on the components inside the wheel side reducer housing from the second opening. There is no need to remove the wheel, nor the wheel side reducer housing and the wheel hub, reducing the operation difficulty and improving the operation efficiency.

[0011] In an alternative embodiment, a plurality of first fixing holes are provided on the end surface where the second opening is located, and a plurality of second fixing holes are provided on the end cover. The plurality of first fixing holes and the plurality of second fixing holes are in one-to-one correspondence and cooperation. Fasteners are inserted into the cooperating first fixing holes and second fixing holes, and the end cover and the housing main body are fixedly connected through the fasteners.

[0012] Based on the above solution, when the end cover and the housing main body are aligned, the plurality of first fixing holes and the plurality of second fixing holes are respectively in one-to-one correspondence and communication. The fasteners are passed through the second fixing holes and fixed to the first fixing holes, thereby realizing the fixed connection between the end cover and the housing main body. The assembly structure of the end cover and the housing main body is simple, the combination is firm and reliable, and it is also beneficial for subsequent disassembly. At the same time, the plurality of fasteners cooperate to fix the end cover and the housing main body, and the fixing is firm and reliable.

[0013] In an alternative embodiment, the planet carrier is provided with an internal spline hole, and the outer peripheral surface of the support shaft is provided with an external spline. The external spline is inserted into the internal spline hole so that the planet carrier and the support shaft are relatively fixed in the circumferential direction of the support shaft.

[0014] Based on the above solution, the internal spline hole and the external spline are snap-fitted, the assembly method is simple, the combination of the planet carrier and the support shaft is firm and reliable, the planet carrier has high stability under the limitation of the support shaft and is not easy to rotate, which is beneficial for the torque to be output from the reducer wheel side housing.

[0015] In an alternative embodiment, the support shaft includes a first shaft body and a second shaft body that are connected and coaxial. The outer diameter of the second shaft body is smaller than that of the first shaft body. The external spline is provided on the outer peripheral surface of the second shaft body, and the internal spline hole is sleeved outside the second shaft body. A retaining ring is provided on the second shaft body, and the retaining ring is located on the side of the planet carrier away from the second shaft body. The retaining ring cooperates with the first shaft body to limit the degree of freedom of the planet carrier in the axial direction of the support shaft.

[0016] Based on the above solution, setting the support shaft as a stepped shaft structure can form a limiting structure on the support shaft. After the planet carrier is sleeved on the second shaft body, one side of the planet carrier can abut against the end face of the first shaft body where the second shaft body is installed, and the degree of freedom of the planet carrier moving towards the first shaft body is restricted by relying on the end face of the first shaft body. At the same time, the retaining ring is clamped on the second shaft body, and the retaining ring is located on the side of the planet carrier away from the first shaft body. The retaining ring restricts the degree of freedom of the planet carrier moving away from the first shaft body. In this way, under the cooperation of the retaining ring and the first shaft body, the degree of freedom of the planet carrier in the axial direction of the support shaft is restricted, the planet carrier is not easy to slide relative to the support shaft, the position is stable and reliable, and the operation is safe and reliable.

[0017] In an alternative embodiment, the planet carrier includes a mounting plate and a mounting pin. The mounting pin is fixed to the mounting plate. The internal spline hole penetrates through the mounting plate. The planet gear is rotatably mounted on the mounting pin. The mounting plate is sleeved outside the second shaft body, and the mounting pin is located on the side of the mounting plate away from the first shaft body.

[0018] Based on the above solution, the structure of the planet carrier is simple, easy to process and manufacture, and has a low cost. At the same time, the planet carrier is light in weight, which is beneficial to the miniaturization and lightweight design of the wheel.

[0019] In an alternative embodiment, the brake cylinder includes a positioning sleeve and a positioning ring plate. The positioning ring plate is installed on the positioning sleeve and is coaxially arranged. The support shaft passes through the positioning sleeve, and the support shaft and the positioning sleeve are relatively fixed in the circumferential direction of the support shaft. The brake piston is sleeved outside the positioning sleeve and is slidably matched with the positioning sleeve. The brake piston, the positioning sleeve and the positioning ring plate cooperate to define an oil chamber.

[0020] The friction plate group includes a plurality of dynamic friction plates and a plurality of static friction plates arranged alternately. A plurality of the dynamic friction plates are all installed on the hub, and a plurality of the static friction plates are all installed on the positioning sleeve.

[0021] Based on the above scheme, the brake cylinder is separated from the inner gear ring, and there is a distance between the two, so that the axial dimension of the brake cylinder on the side close to the inner gear ring is small, the brake cylinder is installed on the support shaft, and the suspended dimension of the brake cylinder on the side close to the inner gear ring is small. In this way, the size of the brake cylinder on the side close to the wheel hub can be increased, the size of the entire brake cylinder on the support shaft is reasonable, the coaxiality of the brake cylinder and the support shaft is high, the installation is compact, and the stability is high during operation. At the same time, since the size of the brake cylinder on the side facing the wheel hub is increased, multiple static friction plates can be assembled on the positioning sleeve of the brake cylinder. Compared with the prior art, the spline sleeve for installing the static friction plate additionally arranged on the support shaft can be omitted, and the seal arranged between the brake cylinder and the spline sleeve can be omitted, thereby reducing the number of parts and components and reducing the processing and manufacturing costs. In addition, the errors caused by manufacturing and assembly are reduced, and the overall assembly quality is improved.

[0022] In an optional embodiment, the wheel hub is rotatably engaged with the support shaft via a bearing; one end of the positioning sleeve abuts against the inner ring of the bearing; a locking nut is threaded on the support shaft, the locking nut abuts against the other end of the positioning sleeve, and the locking nut cooperates with the inner ring to limit the axial freedom of the brake cylinder on the support shaft.

[0023] Based on the above solution, the freedom of the brake cylinder in the axial direction of the support shaft is limited by the cooperation between the locking nut and the bearing, which has a simple structure, is easy to assemble, and has a good limiting effect.

[0024] In an optional embodiment, sealing rings are provided between the brake piston, the positioning sleeve and the positioning ring plate.

[0025] Based on the above scheme, the sealing performance of the oil chamber can be improved by the sealing ring. When the hydraulic oil is used to drive the brake piston to slide relative to the brake cylinder, the hydraulic oil is not easy to overflow from between the brake piston and the positioning sleeve and between the brake piston and the positioning ring plate, thereby ensuring that the piston can provide a stable driving force, so that the dynamic friction plate and the static friction plate cooperate to achieve braking.

[0026] In a second aspect, the utility model provides a new energy transmission device, the new energy transmission device comprising:

[0027] A wet brake wheel reduction assembly as described in any one of the aforementioned embodiments.

[0028] The beneficial effects of the embodiments of the utility model are:

[0029] In summary, for the wet brake wheel side reduction assembly provided in this embodiment, by directly integrating the internal gear ring on the inner circumferential surface of the wheel side reducer housing, the wheel side reducer housing and the planet carrier are separated, and the wheel side reducer housing and the planet carrier are independently arranged, which reduces the processing and manufacturing difficulty, reduces the processing and manufacturing cost, and improves the assembly convenience. At the same time, the brake cylinder is separated from the internal gear ring, and the two are independent of each other. There is a spacing between the side of the brake cylinder close to the internal gear ring and the internal gear ring. The side of the brake cylinder close to the internal gear ring has a small size and less overhanging part. The axial dimension of the brake cylinder is small, which can improve the machining accuracy of the axial dimension of the brake cylinder, make the coaxiality between the brake cylinder and the support shaft higher. After the brake cylinder and the support shaft are matched, a stable axial support force can be provided for the brake piston, ensuring that the brake piston can apply a uniform pressure in the circumferential direction of the support shaft to the friction plate group. When braking, the contact of the friction plate group is uniform, the wear is small, and the operation is stable and reliable. Moreover, since the internal gear ring and the brake cylinder are separated from each other, the force on the internal gear ring and the force on the brake cylinder do not interfere with each other, the force is simple, and the movement is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0031] Figure 1 is an exploded view of the wet brake wheel side reduction assembly according to an embodiment of the present invention;

[0032] Figure 2 is a cross-sectional view of the wet brake wheel side reduction assembly according to an embodiment of the present invention;

[0033] Figure 3 is a schematic diagram of the housing main body according to an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of the planet carrier according to an embodiment of the present invention;

[0035] Figure 5 is a schematic diagram of the support shaft according to an embodiment of the present invention.

[0036] Reference Signs:

[0037] 100 - Half shaft; 200 - Support shaft; 210 - First shaft body; 220 - Second shaft body; 221 - External spline; 230 - Annular abutting surface; 240 - Second bearing; 250 - Locking nut; 300 - Wheel hub; 400 - Wheel side reducer housing; 410 - Internal gear ring; 420 - Housing main body; 421 - First opening; 422 - Second opening; 423 - Flange; 430 - End cover; 440 - Fastener; 500 - Sun gear; 600 - Planet carrier; 610 - Mounting plate; 611 - Internal spline hole; 620 - Mounting pin; 621 - Annular card slot; 630 - First bearing; 640 - Snap ring; 700 - Planet gear; 800 - Braking mechanism; 810 - Braking cylinder; 811 - Positioning sleeve; 812 - Positioning ring plate; 820 - Braking piston; 830 - Friction plate group; 831 - Movable friction plate; 832 - Static friction plate; 840 - Sealing ring; 900 - Spline sleeve. Detailed implementation mode

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated herein generally may be arranged and designed in a variety of different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but is merely representative of selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0040] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0042] In addition, terms such as "horizontal" and "vertical" do not require the components to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0043] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] In the prior art, the planet gear bracket of the wet brake wheel side reducer assembly is integrated with the wheel side reducer housing 400, the ring gear is separated from the wheel side reducer housing 400 and is independently arranged. Moreover, the ring gear is used in cooperation with the brake piston assembly, and the friction plate group 830 is arranged between the brake piston assembly and the hub 300. During braking, the brake piston assembly relies on the ring gear to provide axial support force. During the transmission process, the ring gear meshes with the planetary gear and receives the torque transmitted by the planetary gear. In this way, the ring gear is simultaneously subjected to the axial force during braking and the radial force when the planetary gear transmits torque, and the force on the ring gear is complex, which requires higher strength, machining accuracy, etc. of the components, and the machining and manufacturing cost is high.

[0045] In view of this, the designer provides a wet brake wheel side reducer assembly, which simplifies the structure, reduces the machining and manufacturing difficulty, reduces the machining and manufacturing cost, and improves the stability and reliability during operation.

[0046] Please refer to Figures 1-5, in this embodiment, the wet braking wheel side reduction assembly includes a half shaft 100, a support shaft 200, a wheel hub 300, a wheel side reducer housing 400, a sun gear 500, a planet carrier 600, planet gears 700 and a braking mechanism 800. The half shaft 100 is rotatably mounted on the support shaft 200, and the sun gear 500 is connected to the half shaft 100. The wheel hub 300 is connected to the wheel side reducer housing 400 and is rotatably engaged with the support shaft 200. An internal gear ring 410 surrounding the half shaft 100 is provided on the inner wall surface of the wheel side reduction housing. The planet carrier 600 is mounted on the support shaft 200, and the planet gears 700 are rotatably mounted on the planet carrier 600. The planet gears 700 are simultaneously engaged with the sun gear 500 and the internal gear ring 410. The braking mechanism 800 includes a brake cylinder 810, a brake piston 820 and a friction plate group 830. The brake cylinder 810 is sleeved on the support shaft 200 and is located between the internal gear ring 410 and the wheel hub 300. The brake piston 820 is sleeved on the brake cylinder 810 and is slidably engaged with the brake cylinder 810 in the axial direction of the support shaft 200. The friction plate group 830 is provided between the brake piston 820 and the wheel hub 300.

[0047] Continuing from the above, the working process of the wet braking wheel side reduction assembly provided in this embodiment is as follows:

[0048] After the half shaft 100 inputs torque, it drives the sun gear 500 to rotate, thereby driving the planet gears 700 to rotate. The planet gears 700 rotate on their own axis in cooperation with the internal gear ring 410. Since the planet carrier 600 is mounted on the support shaft 200, the planet carrier 600 remains stationary and does not rotate with the planet gears 700. In this way, the planet gears 700 do not revolve around the axis of the sun gear 500, but transfer the torque to the internal gear ring 410, causing the wheel side reducer housing 400 and the wheel hub 300 to rotate together, and finally driving the wheel to rotate to achieve torque output.

[0049] Since the internal gear ring 410 is directly integrated on the inner circumferential surface of the wheel side reducer housing 400, the wheel side reducer housing 400 and the planet carrier 600 are separated from each other, and the wheel side reducer housing 400 and the planet carrier 600 are independently arranged, which reduces the manufacturing difficulty, reduces the manufacturing cost, and improves the assembly convenience. At the same time, the brake cylinder 810 is separated from the internal gear ring 410, and the two are independent of each other. There is a distance between the side of the brake cylinder 810 close to the internal gear ring 410 and the internal gear ring 410. The side of the brake cylinder 810 close to the internal gear ring 410 has a small size and less suspended part. The axial dimension of the brake cylinder 810 is small, which can improve the machining accuracy of the axial dimension of the brake cylinder 810, make the coaxiality of the brake cylinder 810 and the support shaft 200 higher. After the brake cylinder 810 is matched with the support shaft 200, it can provide a stable axial supporting force for the brake piston 820, ensure that the brake piston 820 can apply uniform pressure to the friction plate group 830 in the circumferential direction of the support shaft 200, and the contact of the friction plate group 830 is uniform during braking, with less wear and stable operation. Moreover, since the internal gear ring 410 and the brake cylinder 810 are separated from each other, the force on the internal gear ring 410 and the force on the brake cylinder 810 do not interfere with each other, the force is simple, and the movement is stable and reliable.

[0050] The following embodiments illustrate the details of the wet braking wheel side reduction assembly provided by the present application by way of example.

[0051] Please refer to Figure 1 and Figure 3 In this embodiment, optionally, the wheel side reducer housing 400 includes a housing main body 420 and an end cover 430. The housing main body 420 is a rotating body, and the housing main body 420 has an inner cavity with both ends open. The cross-sectional contour of the inner cavity is circular, and the cross-section is a plane perpendicular to the axis of the inner cavity. When the housing main body 420 is sleeved on the support shaft 200, the axis of the housing main body 420 is collinear with the axis of the support shaft 200. For the convenience of description, the two open ends of the housing main body 420 are the first open end 421 and the second open end 422 arranged oppositely on the axis of the housing main body 420. An outwardly turned flange 423 is provided at the first open end 421, and the hub 300 is installed at the first open end 421 and fixed to the flange 423 through structural parts such as bolts. The end cover 430 is detachably installed at the second open end 422, and the internal gear ring 410 is formed on the inner circumferential surface of the housing main body 420 and is located on the side of the hub 300 close to the second open end 422. Thus, when the end cover 430 is opened, structural parts such as the planet gear 700, the sun gear 500, the planet carrier 600, and the half shaft 100 that are in transmission cooperation with the internal gear ring 410 are all exposed at the second open end 422, which is convenient for maintenance and repair operations.

[0052] Optionally, a plurality of first fixing holes are provided on the end surface where the second opening 422 is located. The first fixing holes can be threaded holes, and the plurality of first fixing holes are evenly spaced in the circumferential direction of the housing body 420. The number of the first fixing holes is set as required and is not specifically limited in this embodiment. Correspondingly, a plurality of second fixing holes are provided on the end cover 430. The second fixing holes can be round holes, and the number of the second fixing holes is the same as that of the first fixing holes. In this way, the plurality of first fixing holes and the plurality of second fixing holes are in one-to-one correspondence and cooperation. A fastener 440 is inserted into the cooperating first fixing hole and second fixing hole, and the end cover 430 and the housing body 420 are fixedly connected through the fastener 440. That is to say, the fastener 440 can be a structural member such as a bolt. The fastener 440 is inserted into the second fixing hole on the end cover 430 and is screwed and fixed with the corresponding first fixing hole. The connection manner between the end cover 430 and the housing body 420 is simple and reliable, and the disassembly and assembly are convenient.

[0053] Please refer to Figure 4 In this embodiment, optionally, the planet carrier 600 includes a mounting plate 610, a plurality of mounting pins 620, and a plurality of first bearings 630. An internal spline hole 611 is provided through the middle position of the mounting plate 610. Concave surfaces can be provided at the four peripheral edges of the mounting plate 610 to reduce the weight of the mounting plate 610 and save materials while ensuring the structural strength of the mounting plate 610. The plurality of mounting pins 620 are all fixed on the same surface of the mounting plate 610. The number of the mounting pins 620 can be but is not limited to three. The plurality of mounting pins 620 are evenly spaced around the internal spline hole 611. The number of the first bearings 630 is the same as the number of the mounting pins 620, and each mounting pin 620 is sleeved with a first bearing 630. The number of the planet gears 700 is the same as the number of the mounting pins 620, and each first bearing 630 is sleeved with a planet gear 700.

[0054] Further, an annular groove 621 is provided on the outer peripheral surface of each mounting pin 620, and a snap ring 640 is provided in the annular groove 621. The snap ring 640 abuts against the side of the inner ring of the first bearing 630 away from the mounting plate 610, and the snap ring 640 and the mounting plate 610 cooperate to limit the freedom degree of the inner ring of the first bearing 630 in the axial direction of the mounting pin 620.

[0055] It should be understood that the mounting pin 620 and the mounting plate 610 can be provided as an integral structure, which has high structural strength and long service life.

[0056] When installing the planet carrier 600 and the support shaft 200, the planet carrier 600 is inserted into the support shaft 200 from the second opening 422, and the mounting pins 620 are located on the side of the planet carrier 600 close to the second opening 422. In this way, the mounting pins 620 are exposed at the second opening 422, which is convenient for the installation of the planet gears 700 and also convenient for subsequent maintenance and repair operations.

[0057] Please combine with Figure 5 In this embodiment, optionally, the support shaft 200 is provided as a stepped shaft. For example, the support shaft 200 includes a first shaft body 210 and a second shaft body 220 that are integrally and coaxially arranged. Both the first shaft body 210 and the second shaft body 220 are cylindrical shaft bodies. The outer diameter of the first shaft body 210 is greater than the outer diameter of the second shaft body 220. One end of the first shaft body 210 is butted against one end of the second shaft body 220. The end face of the first shaft body 210 connected to the second shaft body 220 forms an annular abutting surface 230. After the support shaft 200 is installed with the wheel side reducer housing 400 and the wheel hub 300, the end of the second shaft body 220 away from the first shaft body 210 is close to the second open end 422, that is, the first shaft body 210 is located at the end of the second shaft body 220 away from the second open end 422. At the same time, an external spline 221 is provided on the outer peripheral surface of the second shaft body 220. The mounting plate 610 can be installed on the second shaft body 220 from the second open end 422. The internal spline hole 611 on the mounting plate 610 and the external spline 221 on the second shaft body 220 are in snap-fit. And, one plate surface of the mounting plate 610 directly abuts against the annular abutting surface 230 of the first shaft body 210. A retaining ring is provided on the side of the mounting plate 610 away from the annular abutting surface 230. The retaining ring is fixedly connected to the second shaft body 220. The retaining ring and the annular abutting surface 230 cooperate to limit the freedom degree of the mounting plate 610 in the axial direction of the support shaft 200, and the installation method of the planet carrier 600 is convenient and reliable.

[0058] It should be noted that the wheel hub 300 can be rotatably fitted with the first shaft body 210 through two second bearings 240. The two second bearings 240 are arranged at intervals in the axial direction of the first shaft body 210, and each second bearing 240 is relatively fixed to the first shaft body 210 in the axial direction of the first shaft body 210. The wheel hub 300 is supported by two second bearings 240, the cooperation between the wheel hub 300 and the support shaft 200 is more firm, and the wheel hub 300 rotates more stably.

[0059] In this embodiment, the brake oil cylinder 810 optionally includes a positioning sleeve 811 and a positioning ring plate 812 of an integrated structure, the positioning ring plate 812 is installed at one end of the positioning sleeve 811 and is coaxially arranged, and the positioning ring plate 812 is convex relative to the positioning sleeve 811 in the radial outward direction of the positioning sleeve 811. The positioning sleeve 811 is sleeved on the outside of the first shaft body 210 of the support shaft 200, and the positioning sleeve 811 and the first shaft body 210 can cooperate through a spline structure to achieve the circumferential limitation of the positioning sleeve 811 and the first shaft body 210 on the first shaft body 210, and the positioning sleeve 811 will not rotate relative to the support shaft 200. The brake piston 820 is sleeved on the outside of the positioning sleeve 811 and is slidably matched with the positioning sleeve 811 in the axial direction of the first shaft body 210, and the brake piston 820, the positioning sleeve 811 and the positioning ring plate 812 cooperate to define an oil chamber. Sealing rings 840 are provided between the brake piston 820 and the positioning sleeve 811 and between the brake piston 820 and the positioning ring plate 812, which can improve the sealing performance of the oil chamber. When the brake piston 820 slides in the axial direction of the support shaft 200 relative to the brake cylinder 810, the brake piston 820 and the positioning sleeve 811 are always sealed by the sealing ring 840, and the brake piston 820 and the positioning ring plate 812 are always sealed by the sealing ring 840, and oil leakage is not likely to occur. The brake piston 820 can provide a stable thrust to the friction plate group 830, thereby improving the reliability of braking.

[0060] It should be understood that since the brake cylinder 810 is separated from the inner gear ring 410 and the two are arranged independently of each other, the axial dimension of the brake cylinder 810 on the side close to the inner gear ring 410 is reduced, and the brake cylinder 810 is installed on the support shaft 200. The suspended dimension of the side of the brake cylinder 810 close to the inner gear ring 410 is small. In this way, the dimension of the brake cylinder 810 on the side close to the wheel hub 300 can be increased. The dimension of the entire brake cylinder 810 on the support shaft 200 is reasonable, the brake cylinder 810 has a high coaxiality with the support shaft 200, the installation is compact, and the stability is high during operation. At the same time, since the size of the brake cylinder 810 on the side facing the wheel hub 300 is increased, the multiple static friction plates 832 can be directly assembled on the positioning sleeve 811 of the brake cylinder 810. Compared with the prior art, the spline sleeve 900 additionally provided on the support shaft 200 for mounting the static friction plates 832 can be omitted, and the seal provided between the brake cylinder 810 and the spline sleeve 900 can be omitted, thereby reducing the number of parts and components and reducing the processing and manufacturing costs. In addition, the errors generated by manufacturing and assembly are also reduced, and the overall assembly quality is improved. In other words, the brake cylinder 810 of this embodiment is integrated with the spline sleeve 900 for mounting the dynamic friction plate 831 in the prior art, thereby reducing the number of parts and components, reducing the difficulty of assembly, and improving the assembly quality. It should be understood that in other embodiments, the brake cylinder 810 and the spline sleeve 900 can be provided independently.

[0061] It should be noted that the positioning sleeve 811 is inserted onto the support shaft 200 from the second opening 422, and one end of the positioning sleeve 811 abuts against the inner ring of the second bearing 240 on the side of the two second bearings 240 close to the second opening 422. A locking nut 250 is provided on the second shaft body 220. The locking nut 250 is screwed onto the second shaft body 220. By screwing the locking nut 250, the locking nut 250 can be made to abut against the side of the positioning sleeve 811 away from the second bearing 240. Through the cooperation of the locking nut 250 and the second bearing 240, the degree of freedom of the brake cylinder 810 in the axial direction of the support shaft 200 is restricted.

[0062] Furthermore, the brake cylinder 810 and the planet carrier 600 can be integrally formed as an integral structural member I. The integral structural member I can be positioned by abutting against the stepped shaft of the support shaft 200. The locking nut 250 is adaptively moved outwards to the outermost end of the support shaft 200. By screwing the locking nut 250, the integral structural member I is fixed to the support shaft 200. Since the force exerted by the brake piston 820 on the integral structural member I is borne by the whole of it, the thickness of the integral structural member I can be set smaller than the total superimposed thickness of the separately designed brake cylinder 810 and planet carrier 600.

[0063] Even further, in combination with the embodiments described above, the brake cylinder 810, the planet carrier 600, and the spline sleeve 900 can also be set as an integral structural member II. Both the integral structural member I or the integral structural member II can better optimize the size of the wheel side reduction assembly, reduce the number of parts, and reduce the processing and manufacturing costs.

[0064] In this embodiment, optionally, the friction plate group 830 includes a plurality of dynamic friction plates 831 and a plurality of static friction plates 832 arranged alternately. The plurality of dynamic friction plates 831 are all installed on the wheel hub 300, and the plurality of static friction plates 832 are all installed on the positioning sleeve 811. It should be understood that the number of the dynamic friction plates 831 and the static friction plates 832 can be set as required.

[0065] In the wet brake wheel side reduction assembly provided in this embodiment, by integrating the internal gear ring 410 with the wheel side reducer housing 400 and separating the internal gear ring 410 from the brake cylinder 810, the forces on the internal gear ring 410 and the brake cylinder 810 do not affect each other, and the operation is more stable. Moreover, since complex force conditions do not need to be considered, the processing difficulty of the parts is reduced, and the processing and manufacturing costs are reduced.

[0066] This embodiment also provides a new energy transmission device. The new energy transmission device includes a wet brake wheel side reduction assembly, which at least has the advantages of low processing and manufacturing costs and stable and reliable operation.

[0067] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A wet brake wheel-side reduction assembly, characterized in that: include: A half shaft (100), a support shaft (200), a wheel hub (300), a wheel reducer housing (400), a sun gear (500), a planet carrier (600), a planet gear (700) and a brake mechanism (800); The half shaft (100) is rotatably mounted on the support shaft (200); the wheel hub (300) is connected to the wheel reducer housing (400) and both are rotatably matched with the support shaft (200); an inner gear ring (410) surrounding the half shaft (100) is provided on the inner wall surface of the wheel reducer housing; the sun gear (500) is connected to the half shaft (100), the planet carrier (600) is mounted on the support shaft (200), the planet gear (700) is rotatably mounted on the planet carrier (600), and the planet gear (700) is meshed with the sun gear (500) and the inner gear ring (410) at the same time; The braking mechanism (800) comprises a brake cylinder (810), a brake piston (820) and a friction plate group (830); the brake cylinder (810) is sleeved on the support shaft (200) and is located between the inner gear ring (410) and the wheel hub (300); the brake piston (820) is sleeved on the brake cylinder (810) and is slidably matched with the brake cylinder (810) in the axial direction of the support shaft (200); and the friction plate group (830) is arranged between the brake piston (820) and the wheel hub (300).

2. The wet brake wheel reduction assembly according to claim 1 is characterized in that: The wheel-side reducer housing (400) includes a housing body (420) and an end cover (430), wherein the housing body (420) has a first opening (421) and a second opening (422) which are spaced apart in the axial direction of the support shaft (200), the wheel hub (300) is mounted on the first opening (421), the end cover (430) is detachably mounted on the second opening (422), and the inner gear ring (410) is located on a side of the wheel hub (300) close to the second opening (422).

3. The wet brake wheel reduction assembly according to claim 2 is characterized in that: A plurality of first fixing holes are arranged on the end face where the second opening (422) is located, and a plurality of second fixing holes are arranged on the end cover (430). The plurality of first fixing holes correspond to the plurality of second fixing holes one by one, and fasteners (440) are inserted into the matching first fixing holes and second fixing holes. The end cover (430) is fixedly connected to the shell body (420) via the fasteners (440).

4. The wet brake wheel reduction assembly according to claim 1 is characterized in that: The planet carrier (600) is provided with an inner spline hole (611), and the outer circumferential surface of the support shaft (200) is provided with an outer spline (221), and the outer spline (221) is inserted into the inner spline hole (611) so that the planet carrier (600) and the support shaft (200) are relatively fixed in the circumferential direction of the support shaft (200).

5. The wet brake wheel reduction assembly according to claim 4 is characterized in that: The support shaft (200) comprises a first shaft body (210) and a second shaft body (220) which are connected and coaxial, wherein the outer diameter of the second shaft body (220) is smaller than the outer diameter of the first shaft body (210), the outer spline (221) is arranged on the outer peripheral surface of the second shaft body (220), and the inner spline hole (611) is sleeved on the outside of the second shaft body (220); a retaining ring is arranged on the second shaft body (220), and the retaining ring is located on the side of the planetary carrier (600) away from the second shaft body (220), and the retaining ring cooperates with the first shaft body (210) to limit the axial freedom of the planetary carrier (600) on the support shaft (200).

6. The wet brake wheel reduction assembly according to claim 5 is characterized in that: The planet carrier (600) comprises a mounting plate (610) and a mounting pin (620), wherein the mounting pin (620) is fixed to the mounting plate (610), the inner spline hole (611) passes through the mounting plate (610), and the planet gear (700) is rotatably mounted on the mounting pin (620); the mounting plate (610) is sleeved on the outside of the second shaft body (220), and the mounting pin (620) is located on a side of the mounting plate (610) away from the first shaft body (210).

7. The wet brake wheel reduction assembly according to claim 1 is characterized in that: The brake oil cylinder (810) comprises a positioning sleeve (811) and a positioning ring plate (812), wherein the positioning ring plate (812) is installed on the positioning sleeve (811) and is coaxially arranged, and the support shaft (200) is inserted into the positioning sleeve (811), and the support shaft (200) and the positioning sleeve (811) are relatively fixed in the circumferential direction of the support shaft (200); the brake piston (820) is sleeved on the outside of the positioning sleeve (811) and is slidably matched with the positioning sleeve (811), and the brake piston (820), the positioning sleeve (811) and the positioning ring plate (812) cooperate to define an oil chamber; The friction plate group (830) comprises a plurality of dynamic friction plates (831) and a plurality of static friction plates (832) arranged alternately, the plurality of dynamic friction plates (831) are all mounted on the wheel hub (300), and the plurality of static friction plates (832) are all mounted on the positioning sleeve (811).

8. The wet brake wheel reduction assembly according to claim 7 is characterized in that: The wheel hub (300) is rotatably matched with the support shaft (200) via a bearing; one end of the positioning sleeve (811) abuts against the inner ring of the bearing; a locking nut (250) is threaded on the support shaft (200), the locking nut (250) abuts against the other end of the positioning sleeve (811), and the locking nut (250) cooperates with the inner ring to limit the axial freedom of the brake cylinder (810) on the support shaft (200).

9. The wet brake wheel reduction assembly according to claim 7, characterized in that: A sealing ring (840) is provided between the brake piston (820), the positioning sleeve (811) and the positioning ring plate (812).

10. A new energy transmission device, characterized in that: The new energy transmission equipment includes: A wet brake wheel reduction assembly as claimed in any one of claims 1 to 9.

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