CN216200202U - Normal close formula walking speed reducer - Google Patents
Normal close formula walking speed reducer Download PDFInfo
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- CN216200202U CN216200202U CN202122391407.XU CN202122391407U CN216200202U CN 216200202 U CN216200202 U CN 216200202U CN 202122391407 U CN202122391407 U CN 202122391407U CN 216200202 U CN216200202 U CN 216200202U
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Abstract
The utility model discloses a normally closed type walking speed reducer which comprises a bearing seat, and a transmission shaft, a primary sun gear, a primary planet assembly, an internal gear, a gear ring, a secondary planet assembly and a tertiary planet assembly which are arranged in the bearing seat; the transmission shaft with power transmission extremely one-level sun gear, one-level sun gear drives one-level planet assembly rotates, one-level planet assembly drives the internal gear rotates, the internal gear drives the ring gear synchronous rotation, the ring gear rotates and drives second grade planet assembly and tertiary planet assembly rotate, tertiary planet assembly rotates and drives the bearing frame rotates in order to export power.
Description
Technical Field
The utility model relates to a speed reducer, in particular to a normally closed walking speed reducer.
Background
Engineering machinery is widely applied to the fields of urban road construction, ports, petroleum, agriculture, civil aviation and the like, and along with the continuous improvement of a national manufacturing innovation system and the rapid development of agricultural modern mechanical equipment, the requirements on the safety stability, the convenience in operation, the durability of parts and the economic applicability of the engineering machinery are higher and higher. The walking speed reducer is used as a core driving device of wheel type or crawler type engineering machinery, and has the phenomena of small transmission ratio and insufficient torque transmission capacity under complex working conditions and severe environments.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a normally closed type walking speed reducer, which solves the problems of small transmission ratio and insufficient torque transmission capacity.
The utility model adopts the following technical scheme for realizing the purposes of the utility model:
the utility model provides a normally closed type walking speed reducer which comprises a bearing seat, and a transmission shaft, a primary sun gear, a primary planet assembly, an internal gear, a gear ring, a secondary planet assembly and a tertiary planet assembly which are arranged in the bearing seat;
the transmission shaft with power transmission extremely one-level sun gear, one-level sun gear drives one-level planet assembly rotates, one-level planet assembly drives the internal gear rotates, the internal gear drives the ring gear synchronous rotation, the ring gear rotates and drives second grade planet assembly and tertiary planet assembly rotate, tertiary planet assembly rotates and drives the bearing frame rotates in order to export power.
Furthermore, the bearing seat is connected with an end cover, an oil inlet and an oil outlet are formed in the outer end face of the end cover, and a stop pin is arranged in the direction of the central axis of the inner wall of the end cover.
Furthermore, a threaded hole is formed in the central axis direction of the stop pin.
Furthermore, the end face of the stop pin is provided with a straight-line-shaped groove or a cross-shaped groove.
Furthermore, one end of the primary sun gear is connected with the transmission shaft through a spline, and the other end of the primary sun gear is meshed with the external teeth of the primary planetary assembly through external teeth.
Further, still be provided with second grade sun gear and tertiary sun gear in the bearing frame, one-level planet carrier internal tooth in the one-level planet assembly reaches second grade planet wheel external tooth in the second grade planet assembly respectively with second grade sun gear external tooth meshing, second grade planet carrier internal tooth in the second grade planet assembly reaches tertiary planet wheel external tooth in the tertiary planet assembly respectively with tertiary sun gear external tooth meshing, one-level planet wheel external tooth in the one-level planet assembly with internal gear internal tooth meshing, second grade planet wheel external tooth in the second grade planet assembly reach tertiary planet wheel external tooth in the tertiary planet assembly all with ring gear internal tooth meshing.
Further, the normally closed walking speed reducer still includes the back shaft, the back shaft with the bearing frame passes through tapered roller bearing and supports, the back shaft with the bearing frame junction is provided with floating oil seal, bearing frame excircle side is provided with the sealing washer, the sealing washer lip hug closely with the back shaft complex the bearing frame terminal surface.
Furthermore, the outer peripheral side of the supporting shaft is in threaded connection with a locking nut used for axially positioning the bearing seat, a pin hole used for reducing looseness of the locking nut is formed in the outer thread end of the supporting shaft along the axis direction, and a pin is installed in the pin hole after the locking nut is assembled.
Furthermore, a piston, an inner friction plate and an outer friction plate are movably arranged in an inner cavity of the supporting shaft, a mounting hole for mounting a spring is formed in the axis direction of the piston, and the piston is pushed to compress the spring to realize axial displacement through hydraulic oil filled in an oil hole of the supporting shaft;
under the non-working state, the spring is in a compressed state, the spring pushes the piston to tightly attach the inner friction plate and the outer friction plate, and the inner friction plate and the outer friction plate are connected through the spline pair to stop the transmission of input power, so that the braking of the speed reducer is realized;
when the speed reducer works, hydraulic oil enters the piston and the inner cavity of the supporting shaft through the oil hole of the supporting shaft, the pressure of the inner cavity is increased to push the piston to compress the spring, at the moment, the inner friction plate and the outer friction plate are changed into a loose state from a compact state, input power can be normally transmitted, and the braking of the speed reducer is relieved.
Furthermore, the input end of the support shaft is provided with a first oil hole which is 30 degrees to the horizontal line, the first oil hole is of a structure with a large outer diameter and a small inner diameter, the first oil hole is communicated with the inner cavity of the piston, and a second oil hole which is 60 degrees to the horizontal line is arranged at the symmetrical lower end of the first oil hole.
The utility model has the beneficial effects that:
the speed reduction and torque increase of the whole machine are realized through the primary planetary assembly, the secondary planetary assembly and the tertiary planetary assembly speed reduction mechanism, and the transmission performance of the whole machine is improved;
a stop pin is arranged at the center of the end cover, so that the stable operation of the whole machine under an overload working condition is ensured;
the transmission shaft and the primary sun gear are integrated, so that the whole structure is more compact, and the transmission efficiency is improved;
a sealing ring is arranged on the joint surface of the bearing seat and the support shaft, so that the damage of external microparticles to the floating oil seal is reduced;
the oil hole on the supporting shaft is designed to be large in outer diameter and small in inner diameter, oil is rapidly filled into the oil inlet, the pressure of the oil outlet is increased, and the reliability of braking and brake release of the whole machine is guaranteed by means of a spring arranged on a piston.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a speed reducer according to the present invention;
FIG. 2 is a schematic diagram of the transmission principle of the speed reducer provided by the present invention;
FIG. 3 is a schematic view of a braking and braking release portion of the reducer according to the present invention;
fig. 4 is a schematic view of a stop pin structure of the speed reducer provided by the utility model.
Detailed Description
The technical scheme of the utility model is further explained in detail by combining the attached drawings:
it should be noted that all the directional indicators (such as up, down, left, right, front, and rear …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The utility model provides a normally closed type traveling speed reducer, which is shown in figure 1 and mainly comprises a dust cover 1, a transmission shaft 34, a primary sun gear 13, a secondary sun gear 25, a tertiary sun gear 26, an internal gear 23, a primary planet assembly 16, a secondary planet assembly 15, a tertiary planet assembly 27, a gear ring 14, a wear-resisting plate 24, a support shaft 2, an end cover 19, a bearing seat 31, an inner friction plate 8, an outer friction plate 9, a large spring 37, a small spring 39, a piston 32, a first hole retainer ring 3 and a bearing 29.
Fig. 2 is a schematic diagram of the transmission principle of the speed reducer, and the specific power transmission route is as follows: the input power is firstly transmitted to the transmission shaft 34, the power is transmitted to the first-stage sun gear 13 through the internal spline of the transmission shaft 34, the first-stage sun gear 13 is meshed with the three first-stage planet gears to drive the first-stage planet gears to rotate, the three first-stage planet gears are meshed with the internal gear 23, the internal gear 23 rotates along with the three first-stage planet gears, the end cover 19, the internal gear 23 and the gear ring 14 are connected through the screw 21, the gear ring 14 rotates along with the three first-stage planet gears, the power sequentially passes through the second-stage planet assembly 15 and the third-stage planet assembly 27, and finally the power is output through the bearing seat 31.
The internal spline of the transmission shaft 34 is connected with the external spline of the first-stage sun wheel 13, the external spline of the transmission shaft 34 is connected with the internal spline of the inner friction plate 8, and the axial positioning of the transmission shaft 34 is realized through a bearing 29 arranged on the bearing mounting seat 11.
One-level planet carrier internal tooth in the one-level planet assembly 16 and second grade planet wheel external tooth in the second grade planet assembly 15 mesh with second grade sun gear 25 external tooth respectively, second grade planet carrier internal tooth in the second grade planet assembly 15 and third grade planet wheel external tooth in the third grade planet assembly 27 mesh with third grade sun gear 26 external tooth respectively.
The inner gear 23 and the end cover 19 are designed in a split mode, two oil ports, namely an oil inlet and an oil outlet, are arranged on the outer end face of the end cover 19, and a mounting hole is designed in the central axis direction of the inner wall of the end cover 19 and is provided with a stop pin 20, so that the damage to transmission parts caused by the fact that the primary planetary assembly 16 moves or deforms and rubs with the inner wall of the end cover 19 due to large acting force when the speed reducer works in an overload mode can be avoided as shown in fig. 4; because the stop pin 20 and the end cover 19 are in interference fit, when the stop pin 20 is installed, the inner hole of the end cover 19 is compressed to generate certain air pressure, so that a threaded hole 20.1 is designed in the center of the stop pin 20, the threaded hole 20.1 at the moment has two major functions, gas in the inner hole of the end cover 19 is discharged in one function to facilitate installation, gas in the inner hole of the end cover 19 is discharged in the other function to facilitate disassembly and replacement of the stop pin 20, and the end face of the stop pin 20 is designed into a linear or cross-shaped oil groove 20.2 to store a part of lubricating oil, lubricate a transmission part and take away heat.
The primary planetary assembly 16, the secondary planetary assembly 15 and the tertiary planetary assembly 27 are composed of corresponding planetary gear carriers, planetary gears, bearings and retainer rings, wherein the primary planetary assembly 16 is composed of three planetary gear trains, a primary cylindrical roller bearing is arranged in an inner hole of the primary planetary gear, and the bearings and the primary planetary gear are axially fixed through the retainer rings arranged in two slotted holes of the primary planetary gear; the secondary planetary assembly 15 is composed of four planetary gear trains, the tertiary planetary assembly 27 is composed of five planetary gear trains, the secondary cylindrical roller bearing and the tertiary cylindrical roller bearing are both of double-row structures, and the axial positioning is realized by assembling a check ring of the bearing in an inner hole groove of the planetary gear.
The outer teeth of the primary sun gear 13 are meshed with the outer teeth of the primary planet gear, the primary planet gear is meshed with the inner gear 23, the outer teeth of the secondary planet gear and the tertiary planet gear are respectively meshed with the outer teeth of the secondary sun gear 25 and the tertiary sun gear 26 and the inner teeth of the gear ring 14, and the axial positioning of the primary planet assembly 16, the secondary planet assembly 15 and the tertiary planet assembly 27 is fixed through a wear-resisting plate and a check ring which are arranged in an inner hole of a planet carrier.
The internal teeth of the gear ring 14 are of a large-modulus and thin-wall double-row structure, the tooth surfaces of the internal teeth are subjected to high-precision gear shaping processing, one end of the gear ring is connected with the bearing seat 31 through a bolt, and the other end of the gear ring is connected with the internal gear 23 and the end cover 19 through a screw 21.
The bearing seat 31 and the supporting shaft 2 are supported through a pair of tapered roller bearings 33, a floating oil seal 38 is arranged at the joint of the bearing seat 31 and the supporting shaft 2, a sealing ring 36 is arranged on the excircle of the bearing seat 31, and the lip of the sealing ring 36 is tightly attached to the end face of the bearing seat 31 matched with the supporting shaft 2, so that the corrosion and abrasion of external microparticles to the floating oil seal 38 are effectively reduced. Meanwhile, the contact surfaces between the parts in the whole machine are sealed by the first O-shaped ring 10, the second O-shaped ring 17, the third O-shaped ring 22, the fourth O-shaped ring 40, the dust cover 1 and the protective plug 41.
The axial positioning of the bearing seat 31 is realized by connecting the internal thread of the locking nut 12 with the external thread of the support shaft 2, two symmetrical pin holes are designed at the external thread end of the support shaft 2 along the axial direction, and the looseness of the locking nut 12 can be reduced by installing the pin 28 after the locking nut 12 is assembled.
The input end of the support shaft 2 is provided with a first oil hole 42 which is 30 degrees to the horizontal line, the oil hole is designed to be of a structure with a large outer diameter and a small inner diameter, the oil hole is communicated with the inner cavity of the piston 32, the lower end which is symmetrical to the oil hole is provided with a second oil hole 43 which is 60 degrees to the horizontal line, and lubricating oil can flow into the inner cavity of the whole machine through the hole to lubricate and cool the bearing 33, the floating oil seal 38, the primary planet assembly 16, the secondary planet assembly 15, the tertiary planet assembly 27 and the gear ring 14.
The piston 32 is evenly distributed with 18 double rows of mounting holes in the axial direction, 18 large springs 37 and 18 small springs 39 are respectively mounted, sealing groove holes are formed in the outer circle of the piston 32 and the inner hole of the bearing seat 11 and are sealed through a first star-shaped sealing ring 6 and a sealing retainer ring 7, and the axial displacement of the piston 32 is realized by pushing the piston 32 to compress the large springs 37 and the small springs 39 through hydraulic oil in an oil hole of the filling support shaft 2.
Fig. 3 shows a braking and braking release device of a speed reducer, which is a normally closed type, that is, in a non-operating state, 18 sets of large springs 37 and small springs 39 are in a compressed state, at this time, the large springs 37 and the small springs 39 push the piston 32 to tightly and tightly attach the inner friction plates 8 and the outer friction plates 9, and the inner friction plates 8 and the outer friction plates 9 are connected through a spline pair to stop the transmission of input power, thereby realizing the braking of the whole machine. When the speed reducer works, braking needs to be relieved, hydraulic oil enters the piston 32 and the inner cavity of the supporting shaft 2 through the first oil hole of the supporting shaft 2, the first star-shaped sealing ring 6, the second star-shaped sealing ring 35, the sealing retainer ring 5 and the sealing retainer ring 7 guarantee reliable sealing, the retainer ring 3 for the first hole, the retainer ring 30 for the second hole and the retainer ring 4 are axially limited, along with the increase of the hydraulic oil in the inner cavity, the pressure in the inner cavity is increased to push the piston 32 to compress the large spring 37 and the small spring 39, at the moment, the inner friction plate 8 and the outer friction plate 9 are changed from a compression state to a relaxation state, input power can be normally transmitted, and the function of relieving braking of the speed reducer is achieved.
While the preferred embodiments of the present invention have been illustrated and described, it will be appreciated that the utility model may be embodied otherwise than as specifically described and that equivalent alterations and modifications, which may be effected thereto by those skilled in the art without departing from the spirit of the utility model, are deemed to be within the scope and spirit of the utility model.
Claims (10)
1. A normally closed type walking speed reducer is characterized by comprising a bearing seat, and a transmission shaft, a primary sun gear, a primary planet assembly, an internal gear, a gear ring, a secondary planet assembly and a tertiary planet assembly which are arranged in the bearing seat;
the transmission shaft with power transmission extremely one-level sun gear, one-level sun gear drives one-level planet assembly rotates, one-level planet assembly drives the internal gear rotates, the internal gear drives the ring gear synchronous rotation, the ring gear rotates and drives second grade planet assembly and tertiary planet assembly rotate, tertiary planet assembly rotates and drives the bearing frame rotates in order to export power.
2. The normally closed type walking speed reducer according to claim 1, wherein the bearing seat is connected with an end cover, an oil inlet and an oil outlet are arranged on the outer end face of the end cover, and a stop pin is arranged in the direction of the central axis of the inner wall of the end cover.
3. The normally closed type travel speed reducer according to claim 2, wherein a threaded hole is formed in the direction of the central axis of the stopper pin.
4. The normally closed type walking speed reducer according to claim 3, wherein the end surface of the stop pin is provided with a straight groove or a cross-shaped groove.
5. The normally closed type traveling speed reducer according to claim 1, wherein one end of the primary sun gear is connected with the transmission shaft through a spline, and the other end of the primary sun gear is meshed with the external teeth of the primary planetary assembly through external teeth.
6. The normally closed type traveling speed reducer according to claim 1, wherein a secondary sun gear and a tertiary sun gear are further provided in the bearing housing, a primary planet carrier inner gear in the primary planet assembly and a secondary planet gear outer gear in the secondary planet assembly are respectively engaged with the secondary sun gear outer gear, a secondary planet carrier inner gear in the secondary planet assembly and a tertiary planet gear outer gear in the tertiary planet assembly are respectively engaged with the tertiary sun gear outer gear, a primary planet gear outer gear in the primary planet assembly is engaged with the inner gear, and a secondary planet gear outer gear in the secondary planet assembly and a tertiary planet gear outer gear in the tertiary planet assembly are both engaged with the gear ring inner gear.
7. The normally closed type traveling speed reducer according to any one of claims 1 to 6, further comprising a support shaft, wherein the support shaft and the bearing seat are supported by a tapered roller bearing, a floating oil seal is arranged at a joint of the support shaft and the bearing seat, a seal ring is arranged on an outer circle side of the bearing seat, and a lip of the seal ring is tightly attached to an end face of the bearing seat matched with the support shaft.
8. The normally closed type travel speed reducer according to claim 7, wherein a lock nut for axially positioning the bearing seat is threadedly connected to an outer peripheral side of the support shaft, a pin hole for reducing looseness of the lock nut is formed in an external threaded end of the support shaft along an axial direction, and a pin is installed in the pin hole after the lock nut is assembled.
9. The normally closed type walking speed reducer according to claim 8, wherein a piston, an inner friction plate and an outer friction plate are movably arranged in an inner cavity of the support shaft, an installation hole for installing a spring is formed in the axial direction of the piston, and the piston is pushed to compress the spring to realize axial displacement through hydraulic oil filled in the support shaft oil hole;
under the non-working state, the spring is in a compressed state, the spring pushes the piston to tightly attach the inner friction plate and the outer friction plate, and the inner friction plate and the outer friction plate are connected through the spline pair to stop the transmission of input power, so that the braking of the speed reducer is realized;
when the speed reducer works, hydraulic oil enters the piston and the inner cavity of the supporting shaft through the oil hole of the supporting shaft, the pressure of the inner cavity is increased to push the piston to compress the spring, at the moment, the inner friction plate and the outer friction plate are changed into a loose state from a compact state, input power can be normally transmitted, and the braking of the speed reducer is relieved.
10. The normally closed type travel speed reducer according to claim 9, wherein the input end of the support shaft is provided with a first oil hole having an angle of 30 ° with the horizontal line, the first oil hole is configured to have a large outer diameter and a small inner diameter, the first oil hole communicates with the piston inner chamber, and a second oil hole having an angle of 60 ° with the horizontal line is provided at a lower end symmetrical to the first oil hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122391407.XU CN216200202U (en) | 2021-09-30 | 2021-09-30 | Normal close formula walking speed reducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122391407.XU CN216200202U (en) | 2021-09-30 | 2021-09-30 | Normal close formula walking speed reducer |
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| Publication Number | Publication Date |
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| CN216200202U true CN216200202U (en) | 2022-04-05 |
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| CN202122391407.XU Active CN216200202U (en) | 2021-09-30 | 2021-09-30 | Normal close formula walking speed reducer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819198A (en) * | 2021-09-30 | 2021-12-21 | 徐州徐工传动科技有限公司 | Normal close formula walking speed reducer |
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2021
- 2021-09-30 CN CN202122391407.XU patent/CN216200202U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819198A (en) * | 2021-09-30 | 2021-12-21 | 徐州徐工传动科技有限公司 | Normal close formula walking speed reducer |
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