A wheel hub reducer and mining truck

Abstract

The present invention discloses a wheel hub reducer and a mining truck, which relate to the technical field of engineering machinery, and include a brake mechanism, a first-stage planetary transmission mechanism and a second-stage planetary transmission mechanism which are sequentially connected in transmission, wherein the first-stage planetary transmission mechanism and the second-stage planetary transmission mechanism are arranged on both sides of the vehicle body structure, and the second-stage planetary transmission mechanism is connected to the wheel hub; the brake mechanism is used to generate braking, and is sequentially transmitted to the wheel hub through the first planetary transmission mechanism and the second-stage planetary transmission mechanism to achieve braking of the wheel hub. The present invention can generate huge braking force on the wheel hub through a relatively small braking torque through the torque-increasing effect of gear transmission.

Description

Technical Field

[0001] The invention relates to a wheel hub reducer and a mining truck, belonging to the technical field of engineering machinery. Background Art

[0002] A mining truck is a heavy-duty dump truck used in open-pit mines to complete rock and earth stripping and ore transportation tasks. Its working characteristics are short travel distance and heavy load. It is usually loaded with a large electric shovel or hydraulic shovel and travels back and forth between the mining point and the unloading point.

[0003] Mining trucks and large engineering vehicles often operate under heavy loads and harsh working conditions, requiring strong traction and efficient braking systems. In steep slopes and complex terrains, the braking performance of the vehicle is critical to ensure the safety of operators and equipment.

[0004] Traditional brake systems are prone to wear under high loads, increasing maintenance costs. Integrated braking functions can reduce maintenance frequency and costs. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a wheel hub reducer and a mining truck, which can generate a huge braking force on the wheel hub through a relatively small braking torque through the torque-increasing effect of gear transmission.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0007] In one aspect, the present invention provides a wheel hub reducer, comprising a brake mechanism, a first-stage planetary transmission mechanism and a second-stage planetary transmission mechanism connected in sequence, wherein the first-stage planetary transmission mechanism and the second-stage planetary transmission mechanism are arranged on both sides of a vehicle body structure, and the second-stage planetary transmission mechanism is connected to a wheel hub;

[0008] The braking mechanism is used to generate braking, and is sequentially transmitted to the wheel hub via the first planetary transmission mechanism and the second-stage planetary transmission mechanism to achieve braking of the wheel hub.

[0009] Furthermore, the brake mechanism includes a brake housing, a first-stage sun gear is provided inside the brake housing, and one end of the first-stage sun gear extending outside the brake housing is connected to the output shaft of the hub motor;

[0010] An inner and outer friction plate pair is provided inside the brake housing, the inner and outer friction plate pair includes a plurality of outer friction plates, an inner friction plate is provided between adjacent outer friction plates, the inner friction plate is connected to the first-stage sun gear, oil chambers are provided on both sides of the inner and outer friction plate pair, a parking static brake piston and a driving dynamic brake piston are provided in the oil chambers respectively, a parking brake release oil port is provided in the oil chamber where the parking static brake piston is located, a dynamic brake oil port is provided in the oil chamber where the driving dynamic brake piston is located, a first spring group is provided on the side of the parking static brake piston away from the inner and outer friction plate pair, a stepped through hole is provided below the driving dynamic brake piston, a stepped bolt is penetrated in the stepped through hole, a tip of the stepped bolt extends into the brake housing, and a second spring group is sleeved on the stepped bolt located between the brake housing and the stepped through hole, the diameter of the second spring group is larger than the stepped through hole;

[0011] When the external hydraulic oil enters the dynamic brake oil port, the driving dynamic brake piston is pushed by the oil pressure to press the outer friction plate, so that the inner friction plate and the first-stage sun gear stop rotating under the pressure of the outer friction plate;

[0012] When external hydraulic oil enters the parking brake release oil port, the parking static brake piston is pushed away from the outer friction plate by the oil pressure, causing the inner friction plate and the first-stage sun gear to rotate together.

[0013] Furthermore, the front of the brake housing is connected to an input side cover, the first-stage sun gear is connected to the input side cover via an input support bearing, and an input oil seal is provided on the contact surface between the first-stage sun gear and the input side cover.

[0014] Furthermore, a friction pair lubricating oil port is provided on one side of the inner and outer friction plate pairs, and the friction pair lubricating oil port is used for injecting lubricating oil.

[0015] Furthermore, the first-stage planetary transmission mechanism includes a first-stage inner gear ring, a first-stage planetary carrier is provided in the first-stage inner gear ring, a plurality of first-stage planetary gears are provided in the first-stage planetary carrier, the first-stage planetary gears are meshed with the first-stage inner gear ring and the first-stage sun gear, the first-stage planetary carrier is provided with an internal spline, and the internal spline is used to connect with the second-stage planetary transmission mechanism.

[0016] Furthermore, both sides of the first-stage planetary carrier are connected to the first-stage inner gear ring via deep groove ball bearings.

[0017] Furthermore, the second-stage planetary transmission mechanism includes an output connecting flange, which is connected to the vehicle body structure through an output support bearing, a second-stage inner gear ring is provided in the output connecting flange, a second-stage planetary carrier is provided in the second-stage inner gear ring, a second-stage sun gear is provided in the middle of the second-stage planetary carrier, an end of the second-stage sun gear close to the first-stage planetary transmission mechanism is connected to the first-stage planetary carrier, a plurality of second-stage planetary gears are provided inside the second-stage planetary carrier, the second-stage planetary gears are meshed with the second-stage inner gear ring and the second-stage sun gear, and the second-stage planetary carrier is connected to the output connecting flange and the wheel hub.

[0018] Furthermore, the second-stage internal gear ring is connected to the vehicle body structure via a spline.

[0019] Furthermore, the first-stage planetary gears and the second-stage planetary gears are evenly arranged in the first-stage planetary rotating frame and the second-stage planetary rotating frame respectively, and pin shafts are provided inside the first-stage planetary rotating frame and the second-stage planetary rotating frame. The first-stage planetary gears and the second-stage planetary gears are respectively correspondingly passed through the pin shafts through planetary wheel bearings.

[0020] On the other hand, the present invention further provides a mining truck, comprising the wheel hub reducer as described in any one of the above items.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention includes a braking mechanism, which can brake the first-stage sun gear. Compared with directly braking the wheel hub, a relatively small braking torque can be used to generate a huge braking force on the wheel hub through the torque-increasing effect of the two-stage gear transmission mechanism, thereby achieving a smaller structural size and a lower manufacturing cost.

[0023] The brake mechanism of the present invention has two functions: static braking and dynamic braking. The static parking brake is braked by the first spring group. When driving, the static brake piston is pushed by external hydraulic oil to release the brake, so that the entire transmission chain can operate. The dynamic brake is to brake to slow down or stop during driving, which can achieve effective braking and is convenient to use.

[0024] The output connection flange of the present invention is located at the radial outermost layer of the entire structure, which does not increase the axial dimension of the overall structure and has the advantages of flexible and compact structure.

[0025] The wheel hub reducer provided by the present invention improves the traction, braking performance and reliability of mining trucks and large engineering vehicles, not only meets the requirements of heavy loads and harsh working conditions, but also reduces maintenance costs and improves overall operational efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a wheel hub reducer in one embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of the exploded structure of a wheel hub reducer in one embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the braking mechanism structure of a wheel hub reducer in an embodiment of the present invention;

[0029] Figure 4 It is a partial enlarged structural schematic diagram of a braking mechanism of a wheel hub reducer in one embodiment of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the first-stage planetary transmission mechanism of a hub reducer in one embodiment of the present invention;

[0031] Figure 6 It is a schematic diagram of the exploded structure of the first-stage planetary transmission mechanism of the hub reducer in one embodiment of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the second-stage planetary transmission mechanism of a hub reducer in one embodiment of the present invention;

[0033] In the figure: 1-brake mechanism, 2-first stage planetary transmission mechanism, 3-second stage planetary transmission mechanism, 4-wheel hub, 5-brake housing, 6-inner and outer friction plate pair, 601-outer friction plate, 602-inner friction plate, 7-oil chamber, 8-parking static brake piston, 9-driving dynamic brake piston, 10-parking brake release oil port, 11-dynamic brake oil port, 12-first spring group, 13-step bolt, 14-second spring group, 15-first stage sun gear, 16-input Side cover, 17-input support bearing, 18-input oil seal, 19-friction pair lubricating oil port, 20-first stage inner gear ring, 21-first stage planetary carrier, 22-first stage planetary gear, 23-internal spline, 24-deep groove ball bearing, 24-body structure, 25-planetary gear bearing, 26-second stage inner gear ring, 27-second stage planetary carrier, 28-second stage sun gear, 29-output support bearing, 30-output connecting flange, 31-output oil seal, 32-second stage planetary gear. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0035] Example 1

[0036] like Figure 1As shown, the hub reducer provided by the embodiment of the present invention includes a brake mechanism 1, a first-stage planetary transmission mechanism 2 and a second-stage planetary transmission mechanism 3 which are sequentially connected in transmission.

[0037] The first-stage planetary transmission mechanism 2 and the second-stage planetary transmission mechanism 3 are arranged on both sides of the vehicle body structure 24, that is, the first-stage planetary transmission mechanism 2 is located outside the vehicle body structure 24, and the second-stage planetary transmission mechanism 3 is located inside the vehicle body structure 24 and connected to the wheel hub 4. In this embodiment, the vehicle body structure 24 includes a vehicle body and a connection support assembly for connection, etc., and the specific structure can be determined according to actual operation.

[0038] The brake mechanism 1 is used to generate a braking force, and transmits the braking force to the wheel hub 4 through the torque-increasing effect of the first planetary transmission mechanism 2 and the second-stage planetary transmission mechanism 3, so as to achieve braking of the wheel hub 4.

[0039] Example 2

[0040] On the basis of Example 1, the brake mechanism 1 provided in this embodiment includes a brake housing 5, and an input side cover 16 is provided at the front of the brake housing 5. The input side cover 16 is connected to the first-stage sun gear 15 through an input support bearing 17. In some embodiments, the contact surface between the first-stage sun gear 15 and the input side cover 16 is provided with an input oil seal 18, which helps to reduce the friction of the dynamic and static joint surfaces.

[0041] The first-stage sun gear 15 is provided with an internal spline 23 at one end extending out of the input side housing 16. The first-stage sun gear 15 is connected to the output shaft of the hub motor through the internal spline 23. External splines are provided at the circumferential side and tail (the end away from the input side housing 16) of the first-stage sun gear 15. An inner and outer friction plate pair 6 is provided inside the brake housing 5. The inner and outer friction plate pair 6 includes a plurality of outer friction plates 601, and an inner friction plate 602 is provided between two adjacent outer friction plates 601. The inner friction plate 602 is connected to the external spline at the circumferential side of the first-stage sun gear 15. In this embodiment, the number of the outer friction plates 601 is 4, and the number of the inner friction plates 602 is 3, but it is not limited thereto. It is only necessary to satisfy that the outer friction plates and the inner friction plates are arranged at intervals, and the outer friction plate has one more than the inner friction plate.

[0042] Oil chambers 7 are provided on both sides of the inner and outer friction plate pairs 6. The left oil chamber 7 is provided with a driving dynamic brake piston 9 and a dynamic brake oil port 11. A stepped through hole is provided below the driving dynamic brake piston 9. A stepped bolt 13 is passed through the stepped through hole. The end of the stepped bolt 13 extends into the brake housing 5. A second spring group 14 is sleeved on the stepped bolt 13 located between the brake housing 5 and the stepped through hole. The diameter of the second spring group 14 is larger than the stepped through hole, so the second spring group 14 can offset the stepped through hole.

[0043] It is connected to the brake housing 5 through a stepped bolt 13, and a second spring group 14 is provided between the bolt 13 and the driving dynamic brake piston 9. When external hydraulic oil enters the dynamic brake oil port 11, the driving dynamic brake piston 9 is pushed by the oil pressure to press the outer friction plate 601. During this process, the second spring group 14 gradually becomes compressed, so that the inner friction plate 602 and the first-stage sun gear 15 stop rotating under the pressure of the outer friction plate 601, thereby completing dynamic braking.

[0044] The right oil chamber 7 is provided with a parking static brake piston 8 and a parking brake release oil port 10. A first spring group 12 is provided on the side of the parking static brake piston 8 away from the inner and outer friction plate pairs 6. When external hydraulic oil enters the parking brake release oil port 10, the parking static brake piston 8 is pushed away from the outer friction plate 601 by the oil pressure. At this time, the first spring group 12 gradually becomes compressed. Since the inner friction plate 602 is no longer squeezed by the outer friction plate 601, the inner friction plate 602 and the first-stage sun gear 15 rotate together to complete the release of the static brake.

[0045] A friction pair lubricating oil port 19 is also provided outside the inner and outer friction plate pairs 6 , and the friction pair lubricating oil port 19 is used to inject lubricating oil to ensure good use of the inner and outer friction plate pairs 6 .

[0046] The first-stage planetary transmission mechanism 2 includes a first-stage inner gear ring 20, and the first-stage inner gear ring 20, the brake housing 5 and the input side cover 16 are fastened together in sequence by step bolts 13. A first-stage planetary carrier 21 is arranged in the first-stage inner gear ring 20. In this embodiment, both sides of the first-stage planetary carrier 21 are connected to the first-stage inner gear ring 20 through deep groove ball bearings 24.

[0047] A plurality of first-stage planetary gears 22 are arranged in the first-stage planetary carrier 21. In this embodiment, the number of each stage of planetary gears is 4. The connection mode between the planetary gears and the planetary carrier is that a plurality of pins are arranged in the planetary carrier, and the planetary gears are sleeved on the pins through the planetary gear bearings 25. The first-stage planetary gears 22 are meshed with the external splines at the tail of the first-stage sun gear 15 and the first-stage internal gear ring 20. The tail of the first-stage planetary carrier 21 is provided with internal splines for connecting with the second-stage planetary gears 32.

[0048] The second-stage planetary transmission mechanism 3 includes an output connecting flange 30, which is outwardly wrapped around the body structure 24 and connected to the body structure 24 through an output support bearing 29. An output oil seal 31 is provided at the contact surface between the output connecting flange 30 and the body structure 24. A second-stage internal gear ring 26 is provided in the output connecting flange 30, and the second-stage internal gear ring 26 is connected to the body structure 24 through a spline.

[0049] A second-stage planetary carrier 27 is provided in the second-stage inner gear ring 26, and the second-stage planetary carrier 27 is connected to the output connecting flange 30 and the hub 4. A second-stage sun gear 28 is provided in the middle of the second-stage planetary carrier 27, and the second-stage sun gear 28 is connected to the internal spline at the tail of the first-stage planetary carrier 21. A plurality of second-stage planetary gears 32 are provided in the second-stage planetary carrier 27, and the second-stage planetary gears 32 are meshed with the second-stage inner gear ring 26 and the second-stage sun gear 28.

[0050] The working principle of this embodiment includes:

[0051] The hub motor is started, and the hub motor drives the first-stage sun gear 15 to rotate, and then outputs to the hub 4 through the first-stage planetary carrier 21, the second-stage sun gear 28, and the second-stage planetary carrier 27 in sequence.

[0052] The braking principle of this embodiment includes:

[0053] When dynamic braking is required during driving, that is, the vehicle is decelerated or urgently stopped, hydraulic oil is introduced into the dynamic brake oil port 11, and the driving dynamic brake piston 9 is pushed by the oil pressure to press the outer friction plate 601. During this process, the second spring group 14 is compressed, so that the inner friction plate 602 and the first-stage sun gear 15 stop rotating together under the pressure of the outer friction plate 601, and then the rear wheel hub 4 also stops rotating eventually through the transmission mechanism.

[0054] When the static brake needs to be released, that is, when switching from parking to driving, the parking brake is released to the oil port 10, and the parking static brake piston 8 is pushed away from the outer friction plate 601 by the oil pressure. During this process, the first spring group 12 is compressed, and since the inner friction plate 602 is no longer squeezed by the outer friction plate 601, the inner friction plate 602 and the first-stage sun gear 15 rotate together.

[0055] Example 3

[0056] This embodiment provides a mining truck, and the mining truck includes the wheel hub reducer described in Embodiment 2.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A wheel hub reducer, characterized in that: It comprises a brake mechanism, a first-stage planetary transmission mechanism and a second-stage planetary transmission mechanism which are sequentially connected in transmission, wherein the first-stage planetary transmission mechanism and the second-stage planetary transmission mechanism are arranged on both sides of the vehicle body structure, and the second-stage planetary transmission mechanism is connected to the wheel hub; The braking mechanism is used to generate braking, and is sequentially transmitted to the wheel hub via the first-stage planetary transmission mechanism and the second-stage planetary transmission mechanism to achieve braking of the wheel hub; The brake mechanism comprises a brake housing, a first-stage sun gear is arranged inside the brake housing, and one end of the first-stage sun gear extending outside the brake housing is connected to the output shaft of the hub motor; An inner and outer friction plate pair is provided inside the brake housing, the inner and outer friction plate pair includes a plurality of outer friction plates, an inner friction plate is provided between adjacent outer friction plates, the inner friction plate is connected to the first-stage sun gear, oil chambers are provided on both sides of the inner and outer friction plate pair, a parking static brake piston and a driving dynamic brake piston are provided in the oil chambers respectively, a parking brake release oil port is provided in the oil chamber where the parking static brake piston is located, a dynamic brake oil port is provided in the oil chamber where the driving dynamic brake piston is located, a first spring group is provided on the side of the parking static brake piston away from the inner and outer friction plate pair, a stepped through hole is provided below the driving dynamic brake piston, a stepped bolt is penetrated in the stepped through hole, a tip of the stepped bolt extends into the brake housing, and a second spring group is sleeved on the stepped bolt located between the brake housing and the stepped through hole, the diameter of the second spring group is larger than the stepped through hole; When the external hydraulic oil enters the dynamic brake oil port, the driving dynamic brake piston is pushed by the oil pressure to press the outer friction plate, so that the inner friction plate and the first-stage sun gear stop rotating under the pressure of the outer friction plate; When external hydraulic oil enters the parking brake release oil port, the parking static brake piston is pushed away from the outer friction plate by the oil pressure, causing the inner friction plate and the first-stage sun gear to rotate together.

2. The wheel hub reducer according to claim 1, characterized in that: The front part of the brake housing is connected with an input side cover shell, the first stage sun gear is connected with the input side cover shell via an input support bearing, and an input oil seal is arranged on the contact surface between the first stage sun gear and the input side cover shell.

3. The wheel hub reducer according to claim 1, characterized in that: A friction pair lubricating oil port is provided on one side of the inner and outer friction plate pairs, and the friction pair lubricating oil port is used for injecting lubricating oil.

4. The wheel hub reducer according to claim 1, characterized in that: The first-stage planetary transmission mechanism includes a first-stage inner gear ring, a first-stage planetary carrier is arranged in the first-stage inner gear ring, a plurality of first-stage planetary gears are arranged in the first-stage planetary carrier, the first-stage planetary gears are meshed with the first-stage inner gear ring and the first-stage sun gear, the first-stage planetary carrier is provided with an internal spline, and the internal spline is connected to the second-stage planetary transmission mechanism.

5. The wheel hub reducer according to claim 4, characterized in that: Both sides of the first-stage planetary rotating frame are connected to the first-stage inner gear ring through deep groove ball bearings.

6. The wheel hub reducer according to claim 1, characterized in that: The second-stage planetary transmission mechanism includes an output connecting flange, which is connected to the vehicle body structure through an output support bearing, a second-stage internal gear ring is arranged in the output connecting flange, a second-stage planetary carrier is arranged in the second-stage internal gear ring, a second-stage sun gear is arranged in the middle of the second-stage planetary carrier, an end of the second-stage sun gear close to the first-stage planetary transmission mechanism is connected to the first-stage planetary carrier, a plurality of second-stage planetary gears are arranged inside the second-stage planetary carrier, the second-stage planetary gears are meshed with the second-stage internal gear ring and the second-stage sun gear, and the second-stage planetary carrier is connected to the output connecting flange and the wheel hub.

7. The wheel hub reducer according to claim 6, characterized in that: The second-stage internal gear ring is connected to the vehicle body structure via a spline.

8. The wheel hub reducer according to claim 4 or 6, characterized in that: The first-stage planetary gears and the second-stage planetary gears are evenly arranged in the first-stage planetary rotating frame and the second-stage planetary rotating frame respectively. Pin shafts are provided inside the first-stage planetary rotating frame and the second-stage planetary rotating frame. The first-stage planetary gears and the second-stage planetary gears are respectively correspondingly passed through the pin shafts through planetary gear bearings.

9. A mining truck, characterized in that: The mining truck comprises a wheel hub reducer as described in any one of claims 1 to 8.

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