CN207906410U - The upper gear box of excavator - Google Patents

Abstract

The utility model discloses a kind of upper gear boxs of excavator, include output shaft, lower bearing including shell, power input assembly and power output assembly, power output assembly, driven gear, and oil sealing combination, chip guard and oil seal cover etc. below driven gear.The inner fovea part of oil seal cover is convexly equipped with oil scraper ring, and chip guard is covered on the oil scraper ring, and oil sealing combination is covered in oil sealing intracavitary.Concave ring is formed between the inner fovea part and oil scraper ring of oil seal cover, is equipped with the oil storage pool being connected with cavity in shell, oil storage pool is connected with external lubricating system.The oil level height of oil storage pool prevents the oil return for being mixed with iron filings from flowing into oil sealing intracavitary less than the level height of the upper surface of oil scraper ring.Using the upper gear box of the utility model, the iron filings in shell can be fallen in cavity, and the impurity such as the iron filings in cavity are taken away in lubricating oil return to oil storage pool, prevent oil sealing combination from being damaged by iron filings, or even cause oil leak.

Description

Excavator upper transmission

technical field

The utility model relates to an excavator transmission system, in particular to an upper transmission box of the excavator.

Background technique

The transmission system of the excavator is composed of a gearbox and an upper gearbox. The output shaft of the engine is connected to the gearbox, and the gearbox is connected to the upper gearbox. The upper gearbox transmits power to the lower gearbox, and the lower gearbox passes through its front and rear. The output shaft is connected with the reduction assembly of the front and rear axles, and the power is transmitted to the front and rear drive axles.

The upper transmission case includes a housing, a power input assembly and a power output assembly. Among them, the power input assembly includes the input shaft, driving gear, bearing seat, bearing, spline sleeve and spacer and other components assembled together; the power output assembly includes the output shaft, driven gear, Lower bearings, oil seals and flanges and other components. Wherein, the oil seal is located under the driven gear. The defect of the traditional power output assembly is that impurities such as iron filings in the housing will fall between the driven gear and the lower bearing and remain above the oil seal, making it difficult to clean the iron filings and impurities and damage the lower oil seal.

In the traditional lubrication system, the oil seal is immersed in the return oil (that is, lubricating oil). When the oil seal is damaged due to iron filings, etc., the lubricating oil will leak, resulting in insufficient lubrication of the driving gear, driven gear and corresponding bearings. , easy to cause damage and increase the cost of parts.

Utility model content

In view of this, the purpose of this utility model is to provide an upper transmission box of an excavator, which has a reasonable structural design, can prevent damage to the lubrication system, solve the problem of oil leakage, and prolong the service life of the upper transmission box.

In order to achieve the above object, the technical solution of the utility model:

An upper transmission case of an excavator includes a housing, a power input assembly and a power output assembly, the power output assembly includes an output shaft, a lower bearing and a driven gear, and the lower bearing fits on the driven gear On the driven gear, the power output assembly also includes an oil seal combination, an anti-dust cover and an oil seal cover, and the anti-dust cover and the oil seal combination are sequentially arranged directly under the driven gear and the lower bearing, so The oil seal cover is provided with an axial hole, which is located on the coaxial center line with the output shaft, and one end of the output shaft is fitted into the oil seal cover through the axial hole, and the oil seal cover fixed together with the lower part of the housing;

The oil seal cover has an inner concave portion, and an oil deflector ring protrudes from the bottom wall of the inner concave portion. An oil seal cavity is formed between the oil rings, and the oil seal assembly is embedded in the oil seal cavity;

A concave cavity is formed between the peripheral wall of the inner concave part of the oil seal cover and the outer peripheral wall of the oil deflector ring, and an oil storage pool communicating with the concave cavity is provided inside the housing, and the oil storage pool is connected with An external lubrication system, the external lubrication system includes an oil tank for storing lubricating oil, the oil tank is located outside the housing, and the oil level of the oil storage tank is lower than the upper end surface of the oil deflector ring level height.

Further, the external lubrication system also includes an oil return pipe, an oil inlet pipe, and an oil pump for extracting lubricating oil, the oil pump is installed on the pipeline of the oil inlet pipe, and one end of the oil inlet pipe is provided with a first oil pipe A joint, the other end of which is provided with a second oil pipe joint, the first oil pipe joint is connected to the bottom of the fuel tank, and the second oil pipe joint is connected to the upper shell of the shell;

One end of the oil return pipe is provided with a third oil pipe joint, and the other end of the oil return pipe is provided with a fourth oil pipe joint, the third oil pipe joint is fixed on the bottom of the housing, and the oil return pipe passes through the first The three oil pipe joints are in communication with the oil storage tank, the other end of the oil return pipe is in communication with the top of the oil tank through the fourth oil pipe joint, and the installation height of the third oil pipe joint is lower than the The horizontal height of the upper end surface of the oil deflector ring, the installation height of the fourth oil pipe joint is lower than the installation height of the third oil pipe joint.

Further, the inside of the oil tank is divided into a sedimentation area and a filter area, and a filter screen is arranged between the sedimentation area and the filter area, and a magnetic block for magnetically attracting iron filings is provided at the bottom of the sedimentation area of the oil tank .

Further, the oil pump adopts a plunger pump or a two-way gear pump.

Further, at least two oil return holes are opened on the peripheral wall of the oil seal along the radial direction of the oil seal, and the concave cavity communicates with the oil storage pool through the oil return holes.

Further, the oil storage pool is located below the input shaft, and the oil storage pool is located below the lower bearing and the driven gear.

Further, the power output assembly further includes a flange, and the flange fits on the end of the output shaft.

Further, the lower bearing is a tapered roller bearing.

After adopting the above technical solution, the utility model is an upper transmission box of an excavator, which has the following beneficial effects: firstly, the iron filings in the casing will fall into the concave cavity, and the anti-dust cover can prevent the iron filings in the casing from falling into And piled up on the top of the oil seal combination. Secondly, there is an oil storage tank connected to the concave cavity inside the shell, and the oil storage tank is connected with an external lubrication system, which can timely discharge the return oil and prevent the return oil mixed with iron filings from being higher than the stopper. The level of the upper end surface of the oil ring overflows into the oil seal cavity. The lubricating oil returns to the oil storage tank to take away impurities such as iron filings in the cavity. On the whole, the upper transmission box of the utility model can prevent the oil seal combination from being soaked in the return oil and even be damaged by iron filings while ensuring that the gears and bearings are fully lubricated by the external lubrication system, and can avoid oil leakage the occurrence of the situation. In this way, the service life of the upper transmission case is increased.

Description of drawings

Fig. 1 is a sectional view of the utility model.

In the picture:

gearbox-a; housing-01;

Driving gear-02; Input shaft-03;

Connecting plate-04; Round nut-05;

Oil seal-06; Bearing seat-07;

Bearing-08; Driven gear-09;

Upper bearing-10; oil seal combination-11;

Oil seal cover-12; Anti-dust cover-13;

Flange - 14; Top cover - 15;

Bearing pressure plate-16; Output shaft-17;

Lower bearing-18; oil deflector-19;

Oil seal cavity-20; concave cavity-21;

Oil storage tank-22; Oil return hole-23;

Oil pump-24; Oil return pipe-25;

Oil inlet pipe-26; Fuel tank-27;

The first oil pipe joint-28; The second oil pipe joint-29;

The third oil pipe joint-30; the fourth oil pipe joint-31;

Precipitation zone-32; Filtration zone-33;

filter screen-34.

Detailed ways

In order to further explain the technical solution of the utility model, the utility model is described in detail through specific examples below.

The transmission system of the excavator is composed of the gearbox a and the upper gearbox. The output shaft of the engine is connected to the gearbox a, and the gearbox a is connected to the upper gearbox. The upper gearbox transmits power to the lower gearbox, and the lower gearbox The power is transmitted to the front and rear drive axles through the docking of the front and rear output shafts with the reduction assembly of the front and rear axles.

The utility model relates to an upper transmission box of an excavator, comprising a housing 01, a power input assembly and a power output assembly. The casing 01 is an airtight structure and has an upper casing, a lower casing, a left casing, a right casing, a front casing and a rear casing which are connected together accordingly. The inside of the housing 01 is also partitioned with a partition. Taking the orientation shown in Figure 1 as a reference orientation, the upper and lower ends of the left housing are respectively connected to the upper housing and the septum. The upper and lower ends of the right housing are respectively connected to the upper and lower housings, the left and right ends of the septum are respectively connected to the left and right housings, and the right end of the septum Connected to the middle and lower part of the right housing.

The power input assembly includes a driving gear 02, an input shaft 03, a connecting plate 04 and a round nut 05. The driving gear 02 is provided with a shaft hole for fitting the input shaft 03, and the driving gear 02 fits on the input shaft 03 through the shaft hole. , the round nut 05 is fastened on the end of the driving gear 02, the upper and lower ends of the connecting plate 04 are installed and fixed on the upper shell and the lower shell of the shell 01 respectively, and the input shaft 03 can pass through the connecting plate 04 The way of rotation is installed on the housing 01. An oil seal 06 is provided on the input shaft 03 between the connecting plate 04 and the end of the driving gear 02 . Taking the orientation shown in Figure 1 as a reference orientation, the left housing of the housing 01 is provided with a left central hole coaxial with the driving gear 02, and a bearing seat 07 is fitted and fixed in the left central hole, and the bearing housing 07 is connected to the driving gear 02. A bearing 08 fits between the gears 02 .

The power output assembly includes an output shaft 17, an upper bearing 10, a top cover 15, a driven gear 09, a lower bearing 18, an oil seal assembly 11, an anti-dust cover 13, an oil seal cover 12 and a flange 14. The driving gear 02 and the driven gear 09 are bevel gears that are meshed. The lower bearing 18 is a tapered roller bearing. The upper shell of the housing 01 is provided with an upper central hole, the lower housing of the housing 01 is provided with a lower central hole, and the middle partition of the housing 01 is provided with a central perforation. The central perforation, the upper central hole and the lower central hole are respectively connected to the The output shaft 17 is located on the coaxial center line. The top cover 15 is sleeved on the upper central hole, and the top cover 15 is in the shape of a cap and is provided with a concave blind hole. The top cover 15 is fixed on the upper casing of the casing 01 by bolts. A bearing pressure plate 16 is embedded in the recessed blind hole of the top cover 15 . An upper bearing 10 is arranged between the wall of the recessed blind hole of the top cover 15 and the top outer wall of the output shaft 17 , and the upper bearing 10 cooperates with the bearing pressure plate 16 . The top cover 15 has a position-limiting function to prevent the output shaft 17 from moving upward. Lower central hole and driven gear 09 are located on the coaxial center line. The oil seal cover 12 fits on the lower central hole, and is locked together with the lower casing of the casing 01 through bolts.

The lower bearing 18 fits between the driven gear 09 and the hole wall of the central hole. The anti-dust cover 13 , the oil seal assembly 11 and the flange 14 are sequentially arranged directly below the driven gear 09 . The oil seal cover 12 is provided with an axial hole, and the axial hole and the output shaft 17 are located on the same axis. One end of the output shaft 17 fits on the oil seal cover 12 through the axial hole, and the flange 14 fits on the spline at the end of the output shaft 17 and is locked together with the output shaft 17 by bolts. There is a gap between the flange 14 and the hole wall of the axial hole of the oil seal cover 12 , and the flange 14 rotates with the output shaft 17 .

The oil seal 12 has an inner recess, and an oil slinger 19 protrudes from the bottom wall of the inner recess, and the oil slinger 19 extends along the axial direction of the oil seal 12 , that is, the oil seal 12 has a double-ring structure. The anti-dust cover 13 has a cover edge, which matches the oil deflector ring 19, and the anti-dust cover 13 covers the oil deflector ring 19, and an oil seal cavity 20 is formed between the outer peripheral wall of the output shaft 17 and the oil deflector ring 19 , the oil seal assembly 11 is embedded in the oil seal cavity 20 . The oil seal assembly 11 includes an upper oil seal unit and a lower oil seal unit. The upper oil seal unit is mainly used for dust prevention, and the lower oil seal unit is mainly used for oil seal. Compared with the traditionally used oil seal unit, the oil seal assembly 11 has better sealing performance and can prevent oil leakage. The oil seal assembly 11 is lubricated with grease. A cavity 21 is formed between the peripheral wall of the inner recess of the oil seal cover 12 and the peripheral wall of the oil deflector 19 . Iron filings in the housing 01 will fall into the cavity 21 from between the driven gear 09 and the lower bearing. The anti-dust cover 13 can be used to prevent the iron filings in the housing 01 from falling into the oil seal cavity 20, thereby preventing the oil seal assembly 11 from being damaged by iron filings and the like, and avoiding oil leakage.

Inside the casing 01 is provided an oil storage pool 22 communicating with the concave cavity 21 . The oil reservoir 22 extends from the right side of the connecting plate 04 to the left side of the right casing of the housing 01, and the oil reservoir 22 is located below the input shaft 03, and the oil reservoir 22 is located between the lower bearing 18 and the The bottom of the moving gear 09. An oil return hole 23 is opened on the peripheral wall of the oil seal 12 along the radial direction of the oil seal 12 . The oil return hole 23 is a through hole. There are at least two oil return holes 23, and a plurality of them can be provided according to actual needs. The cavity 21 communicates with the oil storage pool 22 through the oil return hole 23 . The oil return hole 23 facilitates the return oil temporarily stored in the oil storage tank 22 to enter the concave cavity 21 through the oil return hole 23, and iron filings are mixed into the return oil, and further, the return oil mixed with iron filings flows out from the oil return hole 23 In the oil storage pool 22, the iron filings falling in the cavity 21 are taken away. It should be noted that the oil level of the oil reservoir 22 is always lower than the level of the upper end surface of the oil deflector ring 19 .

The oil reservoir 22 is connected with an external lubrication system. The external lubrication system includes an oil pump 24, an oil return pipe 25, an oil inlet pipe 26 and an oil tank 27. The oil tank 27 is located outside the housing 01 for storing lubricating oil. The oil pump 24 is fixed on the top cover 15 through bolts, that is, on the casing 01 , and the oil pump 24 is located outside the casing 01 . Oil pump 24 is installed on the pipeline of oil inlet pipe 26, is used for pumping lubricating oil from low position to high position. One end of the oil inlet pipe 26 is provided with a first oil pipe joint 28 , and the other end is provided with a second oil pipe joint 29 . The first oil pipe joint 28 is connected to the bottom of the oil tank 27, and the second oil pipe joint 29 is connected to the upper shell of the housing 01 to provide sufficient lubricating oil for power transmission related components such as bearings and gears in the housing 01, so as to Reduce the frictional resistance between the matching parts, ensure the working efficiency, and improve the service life of the upper transmission box, especially the related parts. One end of the oil return pipe 25 is provided with a third oil pipe joint 30 , and the other end of the oil return pipe 25 is provided with a fourth oil pipe joint 31 . The third oil pipe joint 30 is fixed on the bottom of the right housing of the housing 01 . The oil return pipe 25 communicates with the oil storage tank 22 through the third oil pipe joint 30 . The other end of the oil return pipe 25 is communicated with the top of the oil tank 27 through a fourth oil pipe joint 31 . The installation height of the third oil pipe joint 30 is lower than the horizontal height of the upper end surface of the oil deflector ring 19, which is convenient for oil return, and prevents the oil liquid level height of the oil storage tank 22 from being higher than the horizontal height of the upper end surface of the oil deflector ring 19, causing backflow. The oil and iron filings overflow into the oil seal chamber 20, damage the oil seal assembly 11, and even cause oil leakage. The installation height of the fourth oil pipe joint 31 is lower than that of the third oil pipe joint 30, which is convenient for oil return. It should be noted that, per unit time, the amount of oil entering the oil inlet pipe 26 is smaller than the oil return amount of the oil return pipe 25, which can prevent the oil return of the oil storage tank 22 from overflowing.

Further, the inside of the oil tank 27 is divided into a sedimentation area 32 and a filter area 33, the sedimentation area 31 is located on the left side of the oil tank, and the filter area 33 is located on the right side of the oil tank. A filter screen 34 is provided between the precipitation area 32 and the filter area 33 for filtering impurities such as iron filings. The fourth oil pipe joint 31 is installed at a position corresponding to the sedimentation area 32 , and the first oil pipe joint 28 is installed at a position corresponding to the filter area 33 . The bottom of the settling area of the fuel tank 27 is provided with a magnetic block, which can be used to magnetically suck back iron filings in the oil.

Further, the oil pump 24 adopts a plunger pump or a two-way gear pump.

It should be noted that, in the utility model, the input shaft 03 is the shaft through which the power enters the transmission, and the power enters the transmission a from the engine through the input shaft, and then the input shaft 03 drives the driving gear 04 on the shaft to transmit the power to the driven gear 09 And drive output shaft 17 to rotate, finally excavator can realize advancing or retreating.

The above-mentioned embodiments and accompanying drawings do not limit the product form and style of the present utility model, and any appropriate changes or modifications made by those skilled in the art should be regarded as not departing from the patent scope of the present utility model.

Claims (8)

1. An upper transmission case of an excavator, comprising a housing, a power input assembly and a power output assembly, wherein the power output assembly includes an output shaft, a lower bearing and a driven gear, and the lower bearing fits on the On the driven gear, it is characterized in that: the power output assembly also includes an oil seal combination, an anti-dust cover and an oil seal cover, and the anti-dust cover and the oil seal combination are sequentially arranged on the driven gear and the lower Directly below the bearing, the oil seal cover is provided with an axial hole, which is located on the same axis as the output shaft, and one end of the output shaft fits on the oil seal through the axial hole. a cover, the oil seal cover is fixed together with the lower part of the housing; The oil seal cover has an inner concave portion, and an oil deflector ring protrudes from the bottom wall of the inner concave portion. An oil seal cavity is formed between the oil rings, and the oil seal assembly is embedded in the oil seal cavity; A concave cavity is formed between the peripheral wall of the inner concave part of the oil seal cover and the outer peripheral wall of the oil deflector ring, and an oil storage pool communicating with the concave cavity is provided inside the housing, and the oil storage pool is connected with An external lubrication system, the external lubrication system includes an oil tank for storing lubricating oil, the oil tank is located outside the housing, and the oil level of the oil storage tank is lower than the upper end surface of the oil deflector ring level height. 2. The upper transmission case of the excavator according to claim 1, characterized in that: the external lubrication system also includes an oil return pipe, an oil inlet pipe, and an oil pump for extracting lubricating oil, and the oil pump is installed on the On the pipeline of the oil inlet pipe, one end of the oil inlet pipe is provided with a first oil pipe joint, and the other end is provided with a second oil pipe joint, the first oil pipe joint is connected to the bottom of the fuel tank, and the second oil pipe joint an upper case connected to the case; One end of the oil return pipe is provided with a third oil pipe joint, and the other end of the oil return pipe is provided with a fourth oil pipe joint, the third oil pipe joint is fixed on the bottom of the housing, and the oil return pipe passes through the first The three oil pipe joints are in communication with the oil storage tank, the other end of the oil return pipe is in communication with the top of the oil tank through the fourth oil pipe joint, and the installation height of the third oil pipe joint is lower than the The horizontal height of the upper end surface of the oil deflector ring, the installation height of the fourth oil pipe joint is lower than the installation height of the third oil pipe joint. 3. The upper transmission case of the excavator according to claim 2, characterized in that: the inside of the oil tank is divided into a sedimentation area and a filter area, and a filter screen is arranged between the sedimentation area and the filter area, and the The bottom of the sedimentation area of the fuel tank is provided with a magnetic block for magnetically attracting iron filings. 4. The upper transmission case of the excavator according to claim 2 or 3, wherein the oil pump is a plunger pump or a two-way gear pump. 5. The upper transmission case of an excavator according to claim 1, characterized in that: the peripheral wall of the oil seal cover has at least two oil return holes along the radial direction of the oil seal cover, and the concave cavity passes through the The oil return hole communicates with the oil storage pool. 6. The upper transmission case of an excavator according to claim 1, wherein the oil storage tank is located below the input shaft, and the oil storage tank is located between the lower bearing and the driven gear below. 7 . The upper transmission case of an excavator according to claim 1 , wherein the power output assembly further includes a flange, and the flange fits on the end of the output shaft. 8. The upper transmission case of the excavator according to claim 1, wherein the lower bearing is a tapered roller bearing.