A reduction gear for an internal combustion engine

Abstract

The utility model relates to a kind of reducer for internal combustion engine, including reducer left casing and reducer right casing, the outer edge of reducer left casing and reducer right casing is equipped with a row of shell connecting column with fixed hole, more than half of the shell connecting column is exposed outside, and half or less is buried in shell inner part;The upper end of the reducer right casing is equipped with oiling platform, and the lower end of the reducer right casing is equipped with oil discharge platform.Affordable effect is that, originally for punching oil hole and oil hole, thin-wall shell cannot be used in two places, after we set up oiling platform and oil discharge platform in two places, relatively thinner shell can be used, and thin-wall shell can be used as reducer shell by cooperating shell connecting column, so as to have excellent ability to resist cold and hot change, reduce the possibility of cracking of reducer shell under complex cold and hot change condition.

Description

Technical Field

[0001] This utility model relates to a speed reducer specifically for internal combustion engines, mainly involving modifications to the housing. Background Technology

[0002] An internal combustion engine-specific reducer is an independent component consisting of gear transmission, worm gear transmission, and gear transmission enclosed in a rigid housing, and is installed at the output shaft of the internal combustion engine.

[0003] In an internal combustion engine system, the main function of a speed reducer is to reduce speed and increase torque to meet the working requirements under different operating conditions. For example, in equipment such as automobiles, ships, and construction machinery, the output speed of an internal combustion engine is usually relatively high, but the torque is relatively low. A speed reducer can reduce the speed to a suitable range while increasing the torque, enabling the equipment to operate normally.

[0004] During operation, an internal combustion engine generates a large amount of heat, causing the casing temperature to rise. After operation stops, the casing gradually cools down, and this temperature change is transferred to the gearbox casing.

[0005] These frequent temperature changes cause the outer casing to expand and contract, creating thermal stress inside. If this thermal stress exceeds the strength limit of the casing material, it will cause the casing to crack. Utility Model Content

[0006] In order to overcome the shortcomings of the housing of the gearbox used in current internal combustion engines which is prone to cracking, this utility model provides a gearbox for internal combustion engines.

[0007] The technical solution of this utility model to solve its technical problem is as follows: a reducer for an internal combustion engine, comprising a left reducer housing and a right reducer housing, the left reducer housing and the right reducer housing together forming an inner cavity, the inner cavity being provided with a first gear for fixing the output shaft of the internal combustion engine, the inner cavity also being provided with an output shaft with a second gear, the second gear engaging with the first gear for transmission; the left reducer housing is provided with an input hole; the right reducer housing is provided with an output hole, the right end of the output shaft extending out of the output hole and exposed outside; the left reducer housing is provided with a flange around the input hole, the outer side of the flange being provided with a plurality of internal combustion engine connecting posts; the left reducer housing is provided with a support ring extending into the inner cavity, the outer side of the support ring being provided with reinforcing ribs; a left output shaft bearing is installed inside the support ring, a right output shaft bearing is provided inside the output hole, and both ends of the output shaft are mounted in the left output shaft bearing and the right output shaft bearing; The outer edges of the left and right housings of the reducer are provided with a row of housing connecting posts with fixing holes. More than half of the housing connecting posts are exposed outside, and less than half are embedded inside the housing. The reducer also includes several fixing screws screwed on the housing connecting posts to fix the left and right housings of the reducer together. The upper end of the right housing of the reducer is provided with a filling platform, and the filling platform is provided with a filling hole that communicates with the inner cavity. A filling bolt is screwed into the filling hole. The lower end of the right housing of the reducer is provided with an oil drain platform, and the oil drain platform is provided with an oil drain hole that communicates with the inner cavity. An oil drain plug is screwed into the oil drain hole.

[0008] The thickness of the refueling platform is optimized so that the inner end face of the refueling platform and the oil discharge platform are flush with the cross-section of the right housing of the reducer, and the outer end face of the refueling platform and the oil discharge platform are flush with the right end face of the right housing of the reducer.

[0009] To improve the alignment accuracy between the left and right housings, the inner end faces of the oil filling platform and the oil draining platform are provided with positioning pin holes. The left housing of the reducer is provided with positioning pin mounting posts corresponding to the positions of the oil filling platform and the oil draining platform. Positioning pin mounting posts are also provided with positioning pin holes, and positioning pins are installed in the positioning pin holes.

[0010] To increase the strength of the connection, the housing connecting columns are symmetrically arranged along the centerline of the reducer.

[0011] Furthermore, the housing connecting posts are provided with 6.

[0012] The left and right housings of the reducer are made of ductile iron, which gives the housings high strength, high toughness and good resistance to deformation.

[0013] To enhance the sealing performance of the connection between the left and right housings, a sealing ring is provided between the left and right housings of the reducer, and the shape of the sealing ring is consistent with the contact surface of the two housings.

[0014] Furthermore, the sealing ring has clearance holes at the positions of the fixing screw and the locating pin.

[0015] To further enhance structural strength, the outer end of the reinforcing rib outside the support ring is connected to the left housing wall of the reducer.

[0016] Furthermore, the output hole of the right housing of the reducer has an inwardly extending edge, and a second reinforcing rib is provided on the outer side of the edge, with the outer end of the second reinforcing rib connected to the wall of the right housing of the reducer.

[0017] In use, the flange of the left housing of the reducer is installed on the internal combustion engine to seal the opening at the output shaft of the internal combustion engine. Then the output shaft of the internal combustion engine is installed into the first gear. After the internal transmission components are installed, the positioning pin is installed. Finally, the right housing of the reducer is installed and the fixing screws are tightened to complete the installation. In use, this internal combustion engine reducer is the same as the reducer of the prior art, and will not be described in detail here.

[0018] The beneficial effects of this utility model are as follows: Originally, thin-walled shells could not be used at the two locations where oil drain and oil filling holes were made. However, after setting oil filling and oil drain platforms at the two locations, relatively thin shells can be used. At the same time, with the shell connecting column, the shell connection serves not only as a connecting structure but also as a structural reinforcement, which can effectively enhance the overall rigidity of the thin-walled shell. The synergistic effect of the three structures allows us to use a thin-walled shell as the reducer shell, thereby having excellent resistance to drastic temperature changes and reducing the possibility of cracking of the reducer shell under complex drastic temperature change conditions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the speed reducer of this utility model installed on an internal combustion engine.

[0020] Figure 2 This is an exploded view of one embodiment of the present invention.

[0021] Figure 3 This is an exploded schematic diagram from another perspective of one embodiment.

[0022] Figure 4 This is a schematic diagram of the inner end face of the right housing of a reducer in one embodiment. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Example 1 Combined with appendix Figure 1 This reducer 2 is installed in the internal combustion engine 1.

[0025] Combined with appendix Figures 2 to 4 A reducer 2 for an internal combustion engine includes a left reducer housing 3 and a right reducer housing 4, which together form an inner cavity 5. A first gear 6 for fixing an output shaft 8 of the internal combustion engine is provided in the inner cavity 5. An output shaft 8 with a second gear 7 is also provided in the inner cavity 5, and the second gear 7 engages with the first gear 6 for transmission. An input hole 9 is provided on the left reducer housing 3. An output hole 10 is provided on the right reducer housing 4, with the right end of the output shaft 8 extending out of the output hole 10. A flange 11 is provided around the input hole 9 on the left reducer housing 3, and a plurality of internal combustion engine connecting posts 12 are arranged around the outer side of the flange 11. A support ring 13 is provided on the left reducer housing 3 towards the inner cavity 5, and reinforcing ribs 14 are provided on the outer side of the support ring 13. A left output shaft bearing 15 is installed inside the support ring 13, and a right output shaft bearing 16 is provided inside the output hole 10. Both ends of the output shaft 8 are mounted in the left output shaft bearing 15 and the right output shaft bearing 16. The outer edges of the left housing 3 and the right housing 4 of the reducer are provided with a row of housing connecting posts 18 with fixing holes 17. More than half of the housing connecting posts 18 are exposed outside, and less than half are embedded inside the housing. The reducer also includes a number of fixing screws 19 screwed on the housing connecting posts 18 to fix the left housing 3 and the right housing 4 of the reducer together. The upper end of the right housing 4 of the reducer is provided with a filling platform 20, and the filling platform 20 is provided with a filling hole 21 that communicates with the inner cavity 5. A filling bolt 22 is screwed on the filling hole 21. The lower end of the right housing 4 of the reducer is provided with an oil drain platform 23, and the oil drain platform 23 is provided with an oil drain hole 24 that communicates with the inner cavity 5. An oil drain plug 25 is screwed on the oil drain hole 24.

[0026] The thickness of the refueling platform 20 is optimized so that the inner end faces of the refueling platform 20 and the oil draining platform 23 are flush with the cross-section of the right housing of the reducer, and the outer end faces of the refueling platform 20 and the oil draining platform 23 are flush with the right end face of the right housing 4 of the reducer.

[0027] To improve the alignment accuracy between the left and right housings, the inner end faces of the oil filling platform 20 and the oil draining platform 23 are provided with positioning pin holes 26. The left housing 3 of the reducer is provided with positioning pin mounting posts 27 corresponding to the positions of the oil filling platform 20 and the oil draining platform 23. The positioning pin mounting posts 27 are also provided with positioning pin holes 26, and positioning pins 28 are installed in the positioning pin holes 26.

[0028] To increase the strength of the connection, the housing connecting post 18 is symmetrically arranged along the centerline of the reducer 2.

[0029] Furthermore, the housing connecting post 18 has 6 posts.

[0030] The left housing 3 and the right housing 4 of the reducer are made of ductile iron, which gives the housing high strength, high toughness and good resistance to deformation.

[0031] To enhance the sealing performance of the connection between the left and right housings, a sealing ring 29 is provided between the left housing 3 and the right housing 4 of the reducer, and the shape of the sealing ring 29 is consistent with the contact surface of the two.

[0032] Furthermore, the sealing ring 29 has a relief hole 30 at the positions of the fixing screw 19 and the positioning pin.

[0033] To further enhance structural strength, the outer end of the reinforcing rib 14 outside the support ring 13 is connected to the left housing wall of the reducer.

[0034] Furthermore, the output hole 10 of the right housing 4 of the reducer is provided with an inwardly extending hole edge 31, and a second reinforcing rib 32 is provided on the outer side of the hole edge 31. The outer end of the second reinforcing rib 32 is connected to the wall of the right housing of the reducer.

[0035] In this embodiment, the internal combustion engine connecting column 12 outside the flange 11 of the left housing 3 of the reducer is fixed to the internal combustion engine 1 by threaded parts. The flange seals the opening at the output shaft 8 of the internal combustion engine. Then the output shaft 8 of the internal combustion engine is installed into the first gear 6. After the internal transmission components are installed, the positioning pin is installed. Finally, the right housing 4 of the reducer is installed, and the fixing screws 19 are tightened to complete the installation. When in use, this internal combustion engine-specific reducer 2 is the same as the reducer 2 of the prior art, and will not be described again here.

[0036] The beneficial effects of this embodiment are as follows: Originally, thin-walled shells could not be used at two locations due to the need to drill oil drain holes and oil filling holes. However, by setting oil filling platforms and oil drain platforms at two locations, relatively thin shells can be used. At the same time, with the shell connecting columns, the shell connection serves not only as a connecting structure but also as a structural reinforcement, which can effectively enhance the overall rigidity of the thin-walled shell. The synergistic effect of the three structures allows us to use a thin-walled shell as the reducer shell, thereby having excellent resistance to drastic temperature changes and reducing the possibility of cracking of the reducer shell under complex drastic temperature change conditions.

Claims

1. A reducer for an internal combustion engine, comprising a left reducer housing and a right reducer housing, the left and right reducer housings forming an inner cavity, wherein a first gear for fixing an output shaft of the internal combustion engine is disposed in the inner cavity, and an output shaft with a second gear is also disposed in the inner cavity, the second gear engaging with the first gear for transmission; the left reducer housing has an input hole; the right reducer housing has an output hole, and the right end of the output shaft extends out of the output hole and protrudes outwards, characterized in that: The left housing of the reducer is provided with a flange around the input hole, and a number of internal combustion engine connecting columns are provided around the outer side of the flange; the left housing of the reducer is provided with a support ring towards the inner cavity, and the outer side of the support ring is provided with reinforcing ribs; the left output shaft bearing is installed in the support ring, and the right output shaft bearing is provided in the output hole; the two ends of the output shaft are supported in the left output shaft bearing and the right output shaft bearing. The outer edges of the left and right housings of the reducer are provided with a row of housing connecting posts with fixing holes. More than half of the housing connecting posts are exposed outside, and less than half are embedded inside the housing. The reducer also includes several fixing screws screwed on the housing connecting posts to fix the left and right housings of the reducer together. The upper end of the right housing of the reducer is provided with a filling platform, and the filling platform is provided with a filling hole that communicates with the inner cavity. A filling bolt is screwed into the filling hole. The lower end of the right housing of the reducer is provided with an oil drain platform, and the oil drain platform is provided with an oil drain hole that communicates with the inner cavity. An oil drain plug is screwed into the oil drain hole.

2. The reducer for an internal combustion engine according to claim 1, characterized in that: The inner end faces of the refueling platform and the draining platform are flush with the cross-section of the right housing of the reducer, and the outer end faces of the refueling platform and the draining platform are flush with the right end face of the right housing of the reducer.

3. The reducer for an internal combustion engine according to claim 2, characterized in that: The inner end faces of the refueling platform and the drain platform are provided with positioning pin holes. The left housing of the reducer is provided with a positioning pin mounting post corresponding to the positions of the refueling platform and the drain platform. The positioning pin mounting post is also provided with a positioning pin hole, and a positioning pin is installed in the positioning pin hole.

4. The reducer for an internal combustion engine according to claim 1, characterized in that: The housing connecting columns are symmetrically arranged along the centerline of the reducer.

5. The reducer for an internal combustion engine according to claim 4, characterized in that: The shell has 6 connecting columns.

6. The reducer for an internal combustion engine according to claim 1, characterized in that: A sealing ring is provided between the left housing and the right housing of the reducer, and the shape of the sealing ring is consistent with the contact surface of the two.

7. The reducer for an internal combustion engine according to claim 6, characterized in that: The sealing ring has clearance holes at the positions of the fixing screw and the locating pin.

8. The reducer for an internal combustion engine according to claim 1, characterized in that: The left and right housings of the reducer are made of ductile iron.

9. The reducer for an internal combustion engine according to claim 1, characterized in that: The outer end of the reinforcing rib outside the support ring is connected to the left housing wall of the reducer.

10. The reducer for an internal combustion engine according to claim 1, characterized in that: The output hole of the right housing of the reducer has an inwardly extending edge, and a second reinforcing rib is provided on the outer side of the edge, with the outer end of the second reinforcing rib connected to the wall of the right housing of the reducer.

Images