Engineering machinery electric drive hub reduction gear assembly and speed reduction method

Abstract

The invention provides an engineering machinery electrically-driven hub reduction gear assembly and a speed reduction method, and belongs to the technical field of vehicle braking. The engineering machinery electrically-driven hub reduction gear assembly comprises a driving motor, an output shaft of the driving motor is connected with a first-stage sun shaft, and the first-stage sun shaft is connected with a first-stage planet wheel assembly; the first-stage planet wheel assembly is further connected with a second-stage planet wheel assembly through a second-stage sun wheel. The first-stage planet wheel assembly is further connected with a brake through a brake friction plate set, and the brake friction plate set is pressed by the brake to achieve braking of the planet wheel assembly. The second-stage planet wheel assembly is further connected with the end cover through a first fixing bolt. The motor drives the hub reduction gear to decelerate, installation and maintenance are convenient, transmission efficiency and reliability are high, the motor response is fast, forward and backward reversing is fast, operation is more stable, and control is more comfortable. The built-in driving and parking integrated brake adopts a wet-type multi-disc brake, shares a driving friction plate and a parking friction plate, reduces friction pairs, saves installation controls, and is low in cost, high in cost performance, safe and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle braking, and in particular relates to an electric drive wheel reducer assembly of an engineering machinery. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, with the continuous development of the market demand for electric loaders, electric loader products mainly use gearboxes and drive axles for transmission. The overall structure of gearboxes and drive axles is complex, with low transmission efficiency, high noise, high failure rate, and the brake is a caliper disc type external brake with low reliability, which cannot meet the use requirements. By using wheel-side reducers to replace the transmission route of gearboxes and drive axles, the transmission process of electric loaders can be realized more simply and efficiently.

[0004] The existing wheel-side reducers are mostly composed of a primary sun gear, planetary gears, a ring gear and a planetary wheel carrier. Generally, the active sun gear is connected to the half-shaft, the passive planetary wheel carrier is connected to the wheel, and the ring gear is connected to the bridge housing. The wheel-side reducer is used to increase the driving force to meet or correct the force matching of the entire transmission system. At present, there is no wheel-side reducer that is independently driven by an electric motor, and the existing wheel-side reducers often use hydraulic drive, which has low efficiency and high energy consumption. Summary of the invention

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides an electric drive wheel-side reducer assembly for engineering machinery, which is connected to the frame through an integral support shell, and the two support bearings adopt the same model, which is easy to install and more reliable; the integral first and second level inner rings reduce the number of connections and are safe and reliable; the built-in integrated driving and parking brake, the driving and parking friction plates are shared, the friction pairs are reduced, the installation controls are saved, the cost is low, the cost performance is high, and it is safe and reliable.

[0006] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0007] The present invention provides an electric drive wheel-side reducer assembly for engineering machinery, comprising a drive motor, wherein the output shaft of the drive motor is connected to a primary sun shaft, and the primary sun shaft is connected to a primary planetary gear assembly; the primary planetary gear assembly is also connected to a secondary planetary gear assembly via a secondary sun gear; the primary planetary gear assembly is also connected to a brake via a brake friction plate group, and the brake is used to press the brake friction plate group to achieve braking of the planetary gear assembly; the secondary planetary gear assembly is also connected to an end cover via a first fixing bolt.

[0008] As a further technical solution, the first-level planetary gear assembly includes a first-level planetary gear shaft and a first-level planetary gear, the first-level planetary gear is fixed by a first-level planetary gear frame, and the first-level planetary gear shaft is arranged through the first-level planetary gear; the first-level planetary gear frame includes a first first-level planetary gear frame and a second first-level planetary gear frame; the first-level planetary gear is connected to the brake friction plate group through the first first-level planetary gear frame; and is connected to the secondary sun gear through the second first-level planetary gear frame.

[0009] As a further technical solution, the secondary planetary gear assembly includes a secondary planetary gear shaft and a secondary planetary gear, the secondary planetary gear is fixed by a secondary planetary gear frame, and the secondary planetary gear shaft is sleeved on the secondary planetary gear; the secondary planetary gear is connected to the secondary sun gear.

[0010] As a further technical solution, the first-stage planetary gear and the second-stage planetary gear are also meshed with the inner ring gear; the inner ring gear is also connected to the hub through the first main support bearing; the hub is also fixedly connected to the support shell through the second main support bearing.

[0011] As a further technical solution, a floating oil seal is further provided between the support shell and the wheel hub.

[0012] As a further technical solution, the brake includes a service brake and a parking brake; the service brake includes a service brake piston, the service brake piston is located inside the service brake and is connected to a return spring; the return spring is connected to the support shell by a screw; a sealing ring and a support ring are also provided inside the service brake.

[0013] As a further technical solution, the service brake is also fixed to the brake baffle by a second fixing bolt.

[0014] As a further technical solution, the parking brake includes a parking brake piston, which is located inside the parking brake and is also connected to a brake spring; one end of the brake spring is also fixed on a baffle; the baffle is also fixed with a baffle ring through a first hole; the parking brake piston and the service brake piston are connected in series.

[0015] As a further technical solution, a spline sleeve is also sleeved on the output shaft of the driving motor, and a washer is also arranged between the spline sleeve and the first-stage sun shaft, and the washer is fixed by a retaining ring through the second hole.

[0016] A second aspect of the present invention provides a deceleration method using an electric drive wheel reducer assembly of an engineering machinery.

[0017] A deceleration method using an electric drive wheel reducer assembly of an engineering machinery, including parking brake and service brake;

[0018] The parking brake process is as follows: using the brake spring to compress the parking brake piston, thereby driving the service brake piston to compress the brake friction plate group, thereby braking the primary planetary gear assembly and completing parking;

[0019] The service braking process is as follows: releasing the parking brake braking state, specifically, using the parking brake oil inlet to enter the pressure oil, the pressure oil enters the parking brake piston chamber, pushes the parking brake piston to move rightward, so that the brake spring is in a compressed state, the brake friction plate group is loosened, and the parking brake is released; during service braking, using the service brake oil inlet to enter the pressure oil, under the action of the pressure oil, the service brake piston moves to the left, and then presses the brake friction plate group to brake and decelerate.

[0020] One or more of the above technical solutions have the following beneficial effects:

[0021] The present invention reduces speed by driving the wheel-side reducer through a motor, and has the advantages of easy installation and maintenance, high transmission efficiency and reliability, and quick motor response, fast forward and reverse switching, smoother operation and more comfortable control. The present invention is connected to the frame through a supporting shell, and two main supporting bearings adopt the same model, which is easy to install and facilitate subsequent maintenance. The first and second planetary gears are connected by an integral first and second level inner ring, which can reduce the number of connections and is safe and reliable. The present invention has a built-in integrated driving and parking brake, and adopts a wet multi-disc brake. The driving and parking friction plates are shared, which reduces friction pairs and saves installation controls. The cost is low, the cost performance is high, and it is safe and reliable.

[0022] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 It is a schematic structural diagram of an electric drive wheel reducer assembly for engineering machinery in the first embodiment.

[0025] Figure 2 It is a schematic structural diagram of the primary planetary gear assembly and the secondary planetary gear assembly in the first embodiment.

[0026] Figure 3 Schematic diagram of the structure of the brake in the first embodiment.

[0027] In the figure, 1 is an end cover; 2 is a first fixing bolt; 3 is a second-level planetary assembly; 3-1 is a second-level planetary shaft; 3-2 is a second-level planetary gear; 3-3 is a second-level planetary gear carrier; 4 is a fixing bolt; 5 is a first and a second-level inner gear ring; 6 is a first-level planetary assembly; 6-1 is a first-level planetary shaft; 6-2 is a first-level planetary gear; 6-3 is a first-level planetary gear carrier; 6-4 is a second-level planetary gear carrier; 7 is a brake baffle; 8 is a second fixing bolt; 9 is a brake friction plate group; 10-1 is a first main support bearing; 10-2 is a second main support bearing; 11 is a service brake piston assembly; 11-1 is a service brake piston; 11-2 is a first sealing ring; 11-3 is a first Support ring; 11-4 second sealing ring; 11-5 second support ring; 11-6 return spring; 11-7 screw; 12 floating oil seal; 13 support housing; 14 parking brake piston assembly; 14-1 parking brake piston; 14-2 first brake spring; 14-3 second brake spring; 15 baffle; 16 first hole retaining ring; 17 drive motor; 18 second fixing bolt; 19 spline sleeve; 20 washer; 21 second hole retaining ring; 22 first sun shaft; 23 second sun gear; 24 wear pad; 25 drain plug; 26 wheel hub; 27 service brake oil inlet; 28 parking brake oil inlet DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] It should be noted that the terms used herein are for describing specific embodiments only and are not intended to be limiting of exemplary embodiments according to the present invention.

[0030] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0031] At present, with the continuous development of the market demand for electric loaders, electric drive loader products mainly use gearboxes and drive axles for transmission. The overall structure of the gearbox and drive axle is complex, the transmission efficiency is low, the noise is high, the failure rate is high, and the brake is a caliper disc type external brake with low reliability and cannot meet the use requirements. Based on the above problems, the present invention provides an electric drive wheel reducer assembly for engineering machinery.

[0032] Embodiment 1

[0033] This embodiment discloses an electric drive wheel reducer assembly for engineering machinery; Figure 1As shown, an electric drive wheel reducer assembly for engineering machinery includes a drive motor 17, a spline sleeve 19 is sleeved on the output shaft of the drive motor 17, and the spline sleeve 19 is connected to the primary sun shaft 22, and the spline sleeve 19 can effectively transmit the torque of the drive motor 17. A washer 20 is also arranged between the spline sleeve 19 and the primary sun shaft 22, and the washer 20 is fixed by a retaining ring 21 through the second hole, and the washer can effectively reduce the friction between the output shaft of the drive motor and the primary sun shaft 22.

[0034] The primary sun shaft 22 is connected to the primary planetary gear assembly 6. In this embodiment, the primary planetary gear assembly 6 includes a primary planetary gear shaft 6-1 and a primary planetary gear 6-2, the primary planetary gear 6-2 is fixed by a primary planetary gear carrier, and the primary planetary gear shaft 6-1 is arranged through the primary planetary gear 6-2; the primary planetary gear carrier includes a first primary planetary gear carrier 6-3 and a second primary planetary gear carrier 6-4; the primary planetary gear is connected to the brake friction plate group 9 through the first primary planetary gear carrier 6-3; and is connected to the secondary sun gear 23 through the second primary planetary gear carrier 6-4.

[0035] The secondary planetary gear assembly 3 includes a secondary planetary gear shaft 3-1 and a secondary planetary gear 3-2, wherein the secondary planetary gear 3-2 is fixed by a secondary planetary gear carrier 3-3, and the secondary planetary gear shaft 3-1 passes through the secondary planetary gear arrangement; the secondary planetary gear is connected to the secondary sun gear 23, and the secondary planetary gear carrier 3-3 is also connected to the end cover 1 by a first fixing bolt 2, and the secondary sun gear 23 is also connected to the end cover 1 by a wear pad 24. The end cover 1 is also provided with an oil drain plug 25, which can effectively enhance the sealing of the device and prevent oil leakage; and can also facilitate maintenance.

[0036] During use, the input is made through the driving motor 17, transmitted to the primary sun shaft 22 through the spline sleeve, reduced by the primary planet, and driven by the primary planetary gear assembly 6 to drive the secondary sun gear 23, and output is made through the secondary planetary gear assembly 3 to complete the secondary reduction. The motor drives the wheel-side reducer to reduce speed, which is convenient for installation and maintenance, has high transmission efficiency and reliability, and the motor responds quickly, and the forward and reverse switching is fast, so the operation is smoother and the control is more comfortable;

[0037] Furthermore, the primary planetary gear and the secondary planetary gear are also meshed with the inner gear ring 5; the inner gear ring 5 is also fixedly connected to the wheel hub 26 through the first main support bearing 10-1, and the wheel hub 26 is also connected to the support shell 13 through the second main support bearing 10-2; the use of integral primary and secondary inner rings to connect the primary planetary gear and the secondary planetary gear can reduce the number of connections, and is safe and reliable. At the same time, the first main support bearing 10-1 and the second main support bearing 10-2 are of the same model, which is easy to install and facilitate subsequent maintenance. A floating oil seal 12 is also provided between the wheel hub 26 and the support shell 13, and the floating oil seal 12 can be used to achieve a rotary seal between the wheel hub 26 and the support shell 13.

[0038] The brake includes a service brake and a parking brake, wherein the service brake includes a service brake piston assembly 11, the service brake piston assembly 11 includes a service brake piston 11-1, the service brake piston 11-1 is located inside the service brake and is connected to a return spring 11-6; the return spring 11-6 is connected to a support shell 13 by a screw 11-7; a first sealing ring 11-2, a second sealing ring 11-4, a first support ring 11-3, and a second support ring 11-5 are also provided inside the service brake; a brake baffle 7 is also provided on the service brake, and the brake baffle 7 is fixed to the service brake by a second fixing bolt 8.

[0039] The parking brake includes a parking brake piston assembly 14, which includes a parking brake piston 14-1, which is located inside the parking brake and is also connected to a brake spring, one end of which is fixed on a baffle plate 15; the brake spring includes a first brake spring 14-2 and a second brake spring 14-3, wherein the second brake spring 14-3 is placed inside the first brake spring 14-2, and the parking brake piston is reset by the elastic force of the first brake spring 14-2 and the second brake spring 14-3, and the baffle plate 15 is also fixed by a retaining ring 16 through the first hole; in this embodiment, the service brake and the parking brake adopt an integrated multi-disc wet brake, and the parking brake piston 14-1 is connected in series with the service brake piston 11-1.

[0040] During the braking process, the parking brake presses the parking brake piston 14-1 through the brake spring. Since the parking brake piston 14-1 is connected in series with the service brake piston 11-1, the brake friction plate group 9 is compressed, thereby braking the first-stage planetary gear assembly for parking.

[0041] When the planetary gear reducer is used for deceleration, the pressure oil first enters through the parking brake oil inlet 28 to release the brake. Specifically, when the pressure oil enters the parking brake piston chamber, the parking brake piston 14-1 is pushed to the right, so that the brake friction plate group 9 is released and the parking brake is released. Then, when deceleration braking is required during driving, the pressure oil enters through the service brake oil inlet 27, pushing the service brake piston 11-1 to the left, pressing the brake friction plate group 9 to brake and decelerate the planetary gear assembly.

[0042] Embodiment 2

[0043] This embodiment provides a deceleration method using an electric drive wheel reducer assembly of an engineering machinery, including parking brake and service brake;

[0044] The parking brake process is as follows: the parking brake piston 14-1 is compressed by the brake spring. Since the parking brake piston 14-1 is connected in series with the service brake piston 11-1, the service brake piston 11-1 is driven to compress the brake friction plate group 9 under the action of the brake spring, thereby achieving braking of the first-stage planetary gear assembly 6 to complete parking.

[0045] The service braking process is as follows: first, the parking brake is released, and the pressure oil enters through the parking brake oil inlet 28, and the pressure oil enters the parking brake piston chamber, pushing the parking brake piston 14-1 to move rightward. At this time, the brake spring is in a compressed state, so that the brake friction plate group 9 is loosened and the parking brake is released. During service braking, the pressure oil enters through the service brake oil inlet 27, and under the action of the pressure oil, the service brake piston 11-1 moves leftward, thereby pressing the brake friction plate group 9 to brake and decelerate.

[0046] Those skilled in the art should understand that the modules or steps of the present invention described above can be implemented by a general-purpose computer device, or alternatively, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0047] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. An electric drive wheel reducer assembly for engineering machinery, characterized in that: It includes a driving motor, the output shaft of which is connected to the primary sun shaft, the primary sun shaft is connected to the primary planetary gear assembly; the primary planetary gear assembly is also connected to the secondary planetary gear assembly through the secondary sun gear; the primary planetary gear assembly is also connected to the brake through the brake friction plate group, and the brake is used to press the brake friction plate group to achieve braking of the planetary gear assembly; the secondary planetary gear assembly is also connected to the end cover through a first fixing bolt.

2. The electric drive wheel reducer assembly for engineering machinery according to claim 1, characterized in that: The first-stage planetary gear assembly includes a first-stage planetary gear shaft and a first-stage planetary gear, the first-stage planetary gear is fixed by a first-stage planetary gear frame, and the first-stage planetary gear shaft is arranged through the first-stage planetary gear; the first-stage planetary gear frame includes a first first-stage planetary gear frame and a second first-stage planetary gear frame; the first-stage planetary gear is connected to the brake friction plate group through the first first-stage planetary gear frame; and is connected to the second-stage sun gear through the second first-stage planetary gear frame.

3. The electric drive wheel reducer assembly for engineering machinery according to claim 1, characterized in that: The secondary planetary gear assembly includes a secondary planetary gear shaft and a secondary planetary gear. The secondary planetary gear is fixed by a secondary planetary gear frame. The secondary planetary gear shaft is sleeved on the secondary planetary gear. The secondary planetary gear is connected to the secondary sun gear.

4. The electric drive wheel reducer assembly for engineering machinery according to claim 1, characterized in that: The first-stage planetary gear and the second-stage planetary gear are also meshed with the inner gear ring; the inner gear ring is also connected to the wheel hub through the first main support bearing; the wheel hub is also fixedly connected to the support shell through the second main support bearing.

5. The electric drive wheel reducer assembly for engineering machinery as claimed in claim 4, characterized in that: A floating oil seal is also arranged between the support shell and the wheel hub.

6. The electric drive wheel reducer assembly for engineering machinery according to claim 1, characterized in that: The brake comprises a service brake and a parking brake; the service brake comprises a service brake piston, the service brake piston is located inside the service brake and is connected to a return spring; the return spring is connected to a support shell via a screw; a sealing ring and a support ring are also provided inside the service brake.

7. The electric drive wheel reducer assembly for engineering machinery as claimed in claim 6, characterized in that: The service brake is also fixed to the brake baffle by a second fixing bolt.

8. The electric drive wheel reducer assembly for engineering machinery as claimed in claim 6, characterized in that: The parking brake comprises a parking brake piston, which is located inside the parking brake and is also connected to a brake spring; one end of the brake spring is also fixed on a baffle plate; the baffle plate is also fixed by a baffle ring through a first hole; the parking brake piston is connected in series with the service brake piston.

9. The electric drive wheel reducer assembly for engineering machinery according to claim 1, characterized in that: A spline sleeve is also sleeved on the output shaft of the driving motor, and a washer is also arranged between the spline sleeve and the first-stage sun shaft. The washer is fixed by a retaining ring through the second hole.

10. A deceleration method using an engineering machinery electric drive wheel reducer assembly as claimed in any one of claims 1 to 9, characterized in that: Including parking brake and service brake; The parking brake process is as follows: using the brake spring to compress the parking brake piston, thereby driving the service brake piston to compress the brake friction plate group, thereby braking the primary planetary gear assembly and completing parking; The service braking process is as follows: releasing the parking brake braking state, specifically, using the parking brake oil inlet to enter the pressure oil, the pressure oil enters the parking brake piston chamber, pushes the parking brake piston to move rightward, so that the brake spring is in a compressed state, the brake friction plate group is loosened, and the parking brake is released; during service braking, using the service brake oil inlet to enter the pressure oil, under the action of the pressure oil, the service brake piston moves to the left, and then presses the brake friction plate group to brake and decelerate.

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