Planetary speed reduction type axle assembly for excavator

Abstract

The planetary speed reduction type axle assembly comprises an axle shell, a differential mechanism is arranged in the axle shell, an input shaft and symmetrically-arranged output shafts are arranged on the differential mechanism, a supporting shaft and a hub speed reduction mechanism are arranged at the positions, corresponding to the two output shafts, of the axle shell respectively, the supporting shaft is fixed to the axle shell, and the hub speed reduction mechanism is fixed to the axle shell. The hub reduction mechanism comprises a hub, the hub is rotationally connected to the supporting shaft, a first sealing piece is arranged between the hub and the supporting shaft, and a second sealing piece is arranged between the output shaft and the supporting shaft. According to the structure, due to the fact that the buffer groove is formed in the first sealing piece, the first sealing piece can have a buffer space, and it can be guaranteed that the inner wall and the outer wall of the first sealing piece can be tightly attached to the hub and the supporting shaft; under the cooperation of the tensioning groove and the tensioning part of the second sealing piece, when vibration occurs, the two ends of the tensioning part can expand outwards and contract inwards in a reciprocating mode, and external impurities are prevented from entering the second sealing piece.

Description

TECHNICAL FIELD

[0001] The utility model relates to excavator axle technology field especially relates to a planetary reduction formula axle assembly for excavator. BACKGROUND

[0002] The axle assembly of excavator generally includes axle housing, differential, wheel edge reducer and brake and the like component composition. Among them, differential can make the wheel hub of axle housing two ends realize the mechanism of rotating at different rotating speed, thereby can realize the turning of excavator, wheel edge reducer acts in order to make wheel, under the reaction of ground adhesion, produce larger driving force, after the rotating speed and torque that main reducer transmits via its speed reduction and torque increase, transmit to wheel again.

[0003] However, the sealing performance between the transmission mechanism and the wheel edge reducer in the axle assembly of the conventional excavator is poor, which is easy to make the external pollutants enter the transmission mechanism and the wheel edge reducer, and affect the service life of the transmission mechanism and the wheel edge reducer. UTILITY MODEL CONTENT

[0004] The utility model discloses a planetary reduction formula axle assembly for excavator mainly solves the problem that the sealing performance between the transmission mechanism and the wheel edge reducer in the axle assembly of the conventional excavator is poor.

[0005] In order to realize the purpose, the technical scheme of the utility model is as follows:

[0006] The utility model provides a planetary reduction formula axle assembly for excavator, including axle housing, be provided with differential in axle housing, be provided with input shaft and the output shaft of symmetry in differential, axle housing position is provided with support shaft and wheel edge reduction mechanism respectively to two output shafts, support shaft is fixed on axle housing, wheel edge reduction mechanism includes wheel hub, wheel hub is rotatably connected on support shaft, be provided with first sealing piece between wheel hub and support shaft, be provided with second sealing piece between output shaft and support shaft;

[0007] First sealing piece is provided with the concave buffer groove to wheel edge reduction mechanism;

[0008] Second sealing piece is provided with the concave tension groove to the side away from wheel edge reduction mechanism, makes the inner ring of second sealing piece close to output shaft form tension part, and the inside diameter of both ends of tension part gradually reduces setting.

[0009] In an embodiment, the slot of the buffer groove is provided with a protruding fastening ring.

[0010] In an embodiment, the end of the tension part towards the wheel edge reduction mechanism is provided with an outwardly protruding scraper ring, and the thickness of the scraper ring towards the wheel edge reduction mechanism gradually decreases.

[0011] In one embodiment, the wheel-side reduction mechanism further includes a wheel-side cover mounted on the wheel hub, a planetary carrier, a sun gear mounted on the output shaft, a plurality of planetary gears, and an internal gear ring carrier mounted on the support shaft. The planetary gears are rotatably connected between the wheel-side cover and the planetary carrier, and the planetary gears mesh with the sun gear and the internal gear ring carrier respectively. The wheel-side cover and the planetary carrier are integrally formed.

[0012] In one embodiment, a cooling chamber is formed between the planet carrier and the internal gear ring carrier at intervals, and multiple fan blades are provided on the side of the planet carrier facing the internal gear ring carrier, with a ventilation hole penetrating through the center of the planet carrier.

[0013] In one embodiment, the wheel cover is provided with a first rotating groove corresponding to the position of the planetary gear, and the planet carrier is provided with a second rotating groove corresponding to the position of the planetary gear. The two ends of the planetary gear are respectively rotatably connected to the first rotating groove and the second rotating groove.

[0014] The advantages or beneficial effects of the above technical solution include at least the following: by setting a first seal between the hub and the support shaft, and a second seal between the output shaft and the support shaft, the buffer groove of the first seal provides a buffer space, thereby preventing the first seal from being damaged by frequent compression, and ensuring that the inner and outer walls of the first seal can tightly fit the hub and the support shaft; the tension groove and tensioning part of the second seal cooperate to ensure that the inner wall of the second seal tightly fits the surface of the output shaft, and when vibration occurs, the inner diameter of the tensioning part allows the two ends of the tensioning part to reciprocate to expand outward and contract inward, thereby preventing external impurities from entering the second seal and ensuring the service life of the second seal. Attached Figure Description

[0015] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0016] Figure 1 A schematic diagram of a planetary reduction axle assembly according to an exemplary embodiment of the present invention is shown;

[0017] Figure 2 An exemplary embodiment of the present invention is shown. Figure 1 A cross-sectional schematic diagram;

[0018] Figure 3 An exemplary embodiment of the present invention is shown. Figure 2 An enlarged schematic diagram of A;

[0019] Figure 4 A schematic view of a first seal according to an exemplary embodiment of the present application is shown.

[0020] Figure 5 A schematic view of a second seal according to an exemplary embodiment of the present application is shown.

[0021] Figure 6 A schematic view of a wheel-side reduction mechanism according to an exemplary embodiment of the present application is shown.

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 1, axle housing;

[0024] 2, differential;

[0025] 21, input shaft; 22, output shaft;

[0026] 3, support shaft;

[0027] 4, wheel-side reduction mechanism;

[0028] 41, hub; 42, wheel-side cover; 421, first rotating groove; 43, planet carrier; 431, fan blade; 432, ventilation hole; 433, second rotating groove; 44, sun gear; 45, planet gear; 46, inner ring carrier;

[0029] 5, first seal;

[0030] 51, buffer groove; 52, fastening ring;

[0031] 6, second seal;

[0032] 61, tensioning groove; 62, tensioning part; 63, scraping ring. DETAILED DESCRIPTION

[0033] Embodiments of the present application will be described in more detail by referring to the attached drawings. Although certain embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be interpreted as being limited to the embodiments set forth herein, but rather these embodiments are provided so as to more completely and thoroughly understand the present application. It is understood that the drawings and embodiments of the present application are for exemplary purposes only and are not intended to limit the scope of protection of the present application.

[0034] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0035] The term "include" and variations thereof as used herein mean "to include, without limitation." The term "based on" means "based at least in part on." The term "one embodiment" means "at least one embodiment." The term "another embodiment" means "at least one additional embodiment." The term "some embodiments" means "at least some embodiments." Related terms shall be construed accordingly. It should be noted that "a" or "an" entity as used herein indicates "one or more" of that entity. The terminology used herein should not be interpreted as implying that the terminology is prior art known to the technical field even if that terminology is also used by those skilled in the art to refer to a different technical field.

[0036] It should be noted that the modification of "one" or "multiple" mentioned in the utility model is illustrative rather than restrictive, and those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0037] The names of the messages or information exchanged between the plurality of devices in the embodiments of the utility model are only for illustrative purposes, and are not used to limit the scope of the messages or information.

[0038] Referring to Figures 1 to 5 The embodiment of the utility model provides a planetary reduction type axle assembly for excavator, including axle housing 1, be provided with differential mechanism 2 in axle housing 1, be provided with input shaft 21 and the output shaft 22 of symmetrical arrangement on differential mechanism 2, axle housing 1 respectively is provided with support shaft 3 and wheel edge reduction mechanism 4 with the position of two output shafts 22, support shaft 3 is fixed on axle housing 1, wheel edge reduction mechanism 4 includes wheel hub 41, wheel hub 41 is rotatably connected on support shaft 3, first sealing element 5 is arranged between wheel hub 41 and support shaft 3, second sealing element 6 is arranged between output shaft 22 and support shaft 3;

[0039] First sealing element 5 is provided with concave buffer groove 51 towards wheel edge reduction mechanism 4;

[0040] Second sealing element 6 is provided with concave tension groove 61 on the side away from wheel edge reduction mechanism 4, so that the inner ring of second sealing element 6 close to output shaft 22 forms tension part 62, and the inner diameter of both ends of tension part 62 gradually decreases.

[0041] With the above structure, by arranging the first seal 5 between the hub 41 and the support shaft 3 and the second seal 6 between the output shaft 22 and the support shaft 3, the first seal 5 has a buffering space due to the arrangement of the buffering groove 51, so that the first seal 5 is not damaged by being pressed frequently, and the inner wall and the outer wall of the first seal 5 can tightly fit the hub 41 and the support shaft 3; the inner wall of the second seal 6 tightly fits the surface of the output shaft 22 due to the cooperation of the tensioning groove 61 and the tensioning part 62 of the second seal 6, and when vibration occurs, the two ends of the tensioning part 62 can reciprocatingly expand outward and contract inward due to the inner diameter of the tensioning part 62, so that foreign matters in the outside can be prevented from entering the second seal 6, and the service life of the second seal 6 is ensured.

[0042] In an embodiment, referring to Figure 4 , the slot of the buffering groove 51 is provided with a protruding fastening ring 52. In actual use, the tightness of the slot of the buffering groove 51 can be increased due to the arrangement of the fastening ring 52, so that the sealing effect between the slot of the buffering groove 51 and the support shaft 3 is ensured.

[0043] In an embodiment, referring to Figure 5 , one end of the tensioning part 62 towards the wheel rim reduction mechanism 4 is provided with an outwardly protruding scraping ring 63, and the thickness of the scraping ring 63 towards the wheel rim reduction mechanism 4 gradually decreases. In actual use, the foreign matters on the output shaft 22 can be scraped off due to the arrangement of the scraping ring 63, so that the edge of the second seal 6 is protected.

[0044] In an embodiment, referring to Figure 3 and Figure 6 , the wheel rim reduction mechanism 4 further comprises a wheel rim cover 42 mounted on the hub 41, a planet carrier 43, a sun gear 44 mounted on the output shaft 22, a plurality of planet gears 45 rotationally connected between the wheel rim cover 42 and the planet carrier 43, and an inner ring carrier 46 mounted on the support shaft 3, the planet gears 45 are respectively engaged with the sun gear 44 and the inner ring carrier 46, and the wheel rim cover 42 is integrally formed with the planet carrier 43. In actual use, the planetary reduction effect can be achieved due to the cooperation of the sun gear 44, the planet gears 45 and the inner ring carrier 46.

[0045] The planet carrier 43 and the inner ring carrier 46 are spaced apart to form a cooling cavity, the planet carrier 43 is provided with a plurality of fan blades 431 on one side towards the inner ring carrier 46, and the planet carrier 43 is penetrated by a ventilation hole 432 at the center. In actual use, when the planet carrier 43 rotates together with the wheel rim cover 42, the rotation of the fan blades 431 can be driven, so that a flowing air current is formed, and the ventilation and cooling are performed through the ventilation hole 432.

[0046] The wheel cover 42 is provided with a first rotating groove 421 corresponding to the position of the planetary gear 45, the planet carrier 43 is provided with a second rotating groove 433 corresponding to the position of the planetary gear 45, and both ends of the planetary gear 45 are rotatably connected to the first rotating groove 421 and the second rotating groove 433 respectively. In actual application, through the setting of the first rotating groove 421 and the second rotating groove 433, the planetary gear 45 can be rotatably connected between the wheel cover 42 and the planet carrier 43.

[0047] In the description of the present application, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] Those skilled in the art should understand that the above embodiments are only for clearly illustrating the present application, and are not intended to limit the scope of the present application. For those skilled in the art, other changes or modifications can be made on the basis of the above application, and these changes or modifications are still within the scope of the present application.

Claims

1. A planetary-reduction axle assembly for an excavator, characterized by, The axle housing is internally provided with a differential, the differential is provided with an input shaft and symmetrically arranged output shafts, the axle housing is respectively provided with a support shaft and a wheel side reduction mechanism corresponding to the positions of the output shafts, the support shaft is fixed to the axle housing, the wheel side reduction mechanism comprises a hub, the hub is rotationally connected to the support shaft, a first sealing element is arranged between the hub and the support shaft, and a second sealing element is arranged between the output shaft and the support shaft. The first sealing element is provided with an inwardly recessed buffer groove towards the wheel side reduction mechanism. The second sealing element is provided with an inwardly recessed tensioning groove on the side away from the wheel side reduction mechanism, so that the second sealing element forms a tensioning part close to the inner ring of the output shaft, and the inner diameters of the two ends of the tensioning part gradually decrease.

2. The planetary-reduction axle assembly for a backhoe as set forth in claim 1, wherein, The slot of the buffer groove is provided with a protruding fastening ring.

3. The planetary-reduction axle assembly for a backhoe as set forth in claim 1, wherein, The end of the tensioning part towards the wheel side reduction mechanism is provided with an outwardly protruding scraping ring, and the thickness of the scraping ring towards the wheel side reduction mechanism gradually decreases.

4. The planetary-reduction axle assembly for a backhoe as set forth in claim 1, wherein, The wheel side reduction mechanism further comprises a wheel side cover mounted on the hub, a planet carrier, a sun gear mounted on the output shaft, a plurality of planet gears and an inner ring gear carrier mounted on the support shaft, the planet gears are rotationally connected between the wheel side cover and the planet carrier, the planet gears are respectively meshed with the sun gear and the inner ring gear carrier, and the wheel side cover is integrally formed with the planet carrier.

5. The planetary-reduction axle assembly for a backhoe as set forth in claim 4, wherein, Cooling cavities are formed between the planet carrier and the inner ring gear carrier, the planet carrier is provided with a plurality of fan blades on the side towards the inner ring gear carrier, and a ventilation hole is formed in the center of the planet carrier.

6. The planetary-reduction axle assembly for a backhoe as set forth in claim 4, wherein, The wheel side cover is provided with a first rotation groove corresponding to the position of the planet gear, the planet carrier is provided with a second rotation groove corresponding to the position of the planet gear, and the two ends of the planet gear are respectively rotationally connected to the first rotation groove and the second rotation groove.

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