CN210164877U

CN210164877U - Connecting end cover of mini-tiller gearbox

Info

Publication number: CN210164877U
Application number: CN201920578414.0U
Authority: CN
Inventors: 李显; 董斌; 张都兵; 刘林野; 张明伟
Original assignee: Chongqing Dile Jinchi Universal Machinery Co Ltd
Current assignee: Chongqing Dile Jinchi Universal Machinery Co Ltd
Priority date: 2019-04-25
Filing date: 2019-04-25
Publication date: 2020-03-20
Anticipated expiration: 2029-04-25

Abstract

A connecting end cover of a gearbox of a mini-tiller is disclosed, one end of the connecting end cover is provided with a positioning boss, the other end of the connecting end cover is provided with a bearing seat, the center of the bearing seat is provided with a shaft hole penetrating through the positioning boss for inserting a crankshaft of an engine, an annular groove for flowing lubricating oil is arranged around the bearing seat, a concave cavity is arranged below the connecting end cover and is communicated with the annular groove, the connecting end cover is provided with a plurality of first bolt holes which are connected with a gearbox body, a plurality of second bolt holes are connected with a crankcase cover of the engine, the top of the connecting end cover is provided with pressure relief holes which penetrate through the peripheral side wall of the annular groove and are communicated with the annular groove, a guide bulge extending towards the direction of a notch is arranged in the annular groove, one surface of the guide bulge, which corresponds to, the position of the pressure relief hole on the side wall of the annular groove is higher, and the bottom end of the guide slope surface is in smooth transition with the bottom of the annular groove.

Description

Connecting end cover of mini-tiller gearbox

Technical Field

The utility model relates to a plough the machine field a little, in particular to plough connection end cover of quick-witted gearbox a little.

Background

Generally, a power engine used by a mini-tiller is a single-cylinder general engine, and a gearbox of the mini-tiller is connected with the engine through a connecting end cover of the gearbox to form flange connection with a crankcase cover of the engine. In order to ensure that the pressure inside the gearbox and the atmospheric pressure outside the gearbox are kept balanced, a pressure relief hole is usually required to be formed in the connecting end cover, but when the machine runs, lubricating oil in the gearbox can flow at a high speed along the circumferential direction of the inner wall of the gearbox and the inner wall of the connecting end cover under the rotation stirring of the clutch, so that the lubricating oil is leaked from the pressure relief hole of the connecting end cover, and in order to prevent the lubricating oil from leaking from the pressure relief hole, a pressure relief bolt with a small through hole is machined in the pressure relief hole in a mode adopted at present. The mode of assembling the pressure relief bolt in the pressure relief hole needs to drill a hole on the connecting end cover, then tapping and processing an internal thread in the hole, then assembling the pressure relief bolt in the hole through the thread, and when the pressure relief bolt is processed, the secondary processing is needed besides processing an external thread, and a small through hole is drilled on the pressure relief bolt along the axial direction. Therefore, in the manufacturing and processing of the connecting end cover of the gearbox, the structure is relatively complex, the processing procedures are relatively more, and the manufacturing cost is relatively higher.

Disclosure of Invention

The utility model aims at providing a to the not enough of prior art, provide a plough quick-witted connection end cover of gearbox a little, it can play the leak-proof effect of pressure release, simple structure moreover, and the assembly is simple and convenient.

The technical scheme of the utility model is that: a connecting end cover of a gearbox of a mini-tiller is of an integrally formed structure, a positioning boss is arranged at one end, corresponding to a crankcase cover of an engine, of the connecting end cover, and the connecting end cover corresponds to a gearbox cavityThe one end of interior is equipped with the bearing frame, the center of bearing frame sets up the shaft hole that runs through the location boss, and this shaft hole supplies the engine crankshaft to insert, be equipped with an annular groove that supplies lubricating oil to flow around the bearing frame, the below that is located the bearing frame on the link lid is equipped with cavity and annular groove intercommunication, the link end cover is equipped with a plurality of first bolt holes that are used for being connected with the gearbox box, is used for a plurality of second bolt holes of being connected with the engine crankcase lid, the link end cover's a plurality of second bolt holesTop partSet up a pressure release hole, this pressure release hole runs through the periphery lateral wall and the annular groove of annular groove and communicates with each other, be equipped with a direction arch in the annular groove, the direction arch extends to the notch direction of annular groove, and the one side that this direction arch corresponds the lubricating oil flow upstream sets up to the slope of leading, and the one side that corresponds the lubricating oil flow to the low reaches sets up to steep wall, and this steep wall is close to the pressure release hole, the top of the bellied direction slope of leading is less than the notch face of annular groove, is higher than the position of pressure release hole on the annular groove lateral wall, the bottom of slope of leading and the tank bottom smooth transition of annular groove.

The included angle α between the guide slope surface of the guide bulge and the bottom of the annular groove is 45-55 degrees.

The diameter of the pressure relief hole is 3-4 mm.

The plurality of first bolt holes are distributed on the periphery of the connecting end cover, and the plurality of second bolt holes are uniformly distributed at the bottom of the annular groove around the bearing seat.

The plurality of first bolt holes are respectively arranged on a flange arranged on the periphery of the connecting end cover.

The guide bulge is of a structure integrally formed with the connecting end cover.

Adopt above-mentioned technical scheme: the center of the bearing seat is provided with a shaft hole penetrating through the positioning boss, the shaft hole is used for an engine crankshaft to be inserted into and connected with a main shaft in the gearbox, and a clutch on the main shaft can synchronously rotate along with the engine crankshaft. The top of connecting the end cover sets up a pressure release hole, and this pressure release hole radially runs through the periphery cell wall and the annular groove of annular groove along the annular groove and communicates with each other, be equipped with a direction arch in the annular groove, the direction arch extends to the notch direction of annular groove, and the one side that this direction arch corresponds lubricating oil flow direction upstream end sets up to the slope of leading, and the one side that corresponds the lubricating oil flow downstream end sets up to steep wall, and this steep wall is close to the pressure release hole, the top of the bellied direction slope of leading is less than the notch face of annular groove, is higher than the position in pressure release hole. Under the stirring of the rotation of the clutch, lubricating oil in the gearbox flows along the annular groove at a high speed, when the high-speed flowing lubricating oil passes through the guide bulge, the lubricating oil flows over the guide bulge along the guide slope surface, the flow speed enables the high-speed flowing lubricating oil to flow across the pressure relief hole in a waterfall shape, the lubricating oil cannot stay near the pressure relief hole, an air cavity without the lubricating oil is formed in the local space of the annular groove around the pressure relief hole close to the steep wall surface of the guide bulge, the air in the air cavity can be discharged to the external atmosphere from the pressure relief hole due to the fact that the pressure relief hole is just communicated with the air cavity, and the lubricating oil cannot leak from the pressure relief hole, so that the pressure in the gearbox is kept balanced with the external atmospheric pressure; and because the pressure release hole sets up at the top of connecting the end cover, the periphery lateral wall that runs through the annular groove communicates with the annular groove, consequently, when the machine stops, also can not lead to lubricating oil to reveal from pressure release hole department.

The included angle α between the guide slope surface of the guide protrusion and the bottom of the annular groove is 45-55 degrees, if the included angle between the guide slope surface and the bottom of the annular groove is too large, the clutch is easily unable to drive the lubricating oil to cross the guide protrusion from the guide slope surface, if the included angle between the guide slope surface and the bottom of the annular groove is too small, the air cavity formed when the clutch drives the lubricating oil to cross the guide protrusion from the guide slope surface is too small, even the air cavity can not be formed, so that the lubricating oil blocks the pressure release hole and cannot ensure the internal and external pressure balance of the gearbox, and the lubricating oil is easily leaked from the pressure release hole, and the included angle α is set to be 45-55 degrees, so that the lubricating oil can form a sufficient air cavity at the corresponding position of the pressure release hole after.

The diameter of the pressure relief hole is 3-4 mm, so that the pressure relief capacity of the pressure relief hole is guaranteed.

A plurality of first bolt holes distribute in the periphery of connecting the end cover, a plurality of second bolt holes encircle the bottom of bearing frame equipartition at the annular groove, through the position of first bolt hole of rational design and second bolt hole, can practice thrift and plough quick-witted inner space a little, make the structure assemble compacter.

The guide protrusion is of a structure integrally formed with the connecting end cover, so that the processing technology is simplified, and the integrity of the connecting end cover is better.

The invention is further described with reference to the drawings and the specific embodiments.

Drawings

Fig. 1 is a front view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 2;

FIG. 3 is a cross-sectional view B-B of FIG. 2;

FIG. 4 is a functional diagram of the present invention;

FIG. 5 is a schematic view of the clutch assembly of the present invention;

fig. 6 is a sectional view of the utility model assembled in the gearbox of the mini-tiller.

In the attached drawing, 1 is a connecting end cover, 1-1 is a guide bulge, 1a is a guide slope surface, 1b is a steep wall surface, 1-2 is a pressure relief hole, 1-3 is a first bolt hole, 1-4 is a second bolt hole, 1-5 is a positioning boss, 1-6 is a bearing seat, 1-7 is a concave cavity, 1-8 is an annular groove, 1-9 is a shaft hole, 1-10 is a flange, 2 is an engine crankcase cover, 3 is an engine crankshaft, 4 is a clutch, 5 is a bearing, 6 is lubricating oil, 7 is a gearbox and 8 is an air cavity.

Detailed Description

Referring to fig. 1 to 6, in an embodiment of a connecting end cover of a gearbox of a mini-tiller, the connecting end cover 1 is of an integrally formed structure. One end of the connecting end cover 1, corresponding to the crankcase cover 2 of the engine, is provided with a positioning boss 1-5, one end of the connecting end cover 1, corresponding to the cavity of the gearbox 7, is provided with a bearing seat 1-6, a bearing 5 is assembled in the bearing seat 1-6, and a clutch 4 is assembled on the bearing 5. The center of the bearing seat 1-6 is provided with a shaft hole 1-9 penetrating through the positioning boss 1-5, and the shaft hole 1-9 is used for inserting the engine crankshaft 3, so that the engine crankshaft 3 and the connecting end cover 1 are the same axis. The clutch 4 on the bearing 5 is splined to the engine crankshaft 3 so that the clutch 4 will rotate synchronously with the engine crankshaft 3. An annular groove 1-8 for lubricating oil 6 to flow is formed in the periphery of the bearing seat 1-6, and a concave cavity 1-7 is formed in the connecting end cover 1 and is communicated with the annular groove 1-8 and is located below the bearing seat 1-6. The connecting end cover 1 is provided with a plurality of first bolt holes 1-3 used for being connected with a gearbox 7 box body and a plurality of second bolt holes 1-4 used for being connected with an engine crankcase cover 2, the first bolt holes 1-3 are distributed on the periphery of the connecting end cover 1, the second bolt holes 1-4 are uniformly distributed at the bottom of an annular groove 1-8 around a bearing seat 1-6, the first bolt holes 1-3 are respectively arranged on flanges 1-10 arranged on the periphery of the connecting end cover 1, and the layout inside the mini-tiller is optimized by reasonably designing the positions of the first bolt holes 1-3 and the second bolt holes 1-4, so that the structure is assembled more compactly. The top of the connecting end cover 1 is provided with a pressure relief hole 1-2, the pressure relief hole 1-2 penetrates through the peripheral side wall of the annular groove 1-8 to be communicated with the annular groove 1-8, and the diameter of the pressure relief hole 1-2 is 3-4 mm to ensure the pressure relief capacity of the pressure relief hole 1-2. The annular groove 1-8 is internally provided with a guide bulge 1-1, the guide bulge 1-1 extends towards the direction of the notch of the annular groove 1-8, one surface of the guide bulge 1-1, corresponding to the upstream flowing direction of the lubricating oil 6, is provided with a guide slope surface 1a, one surface of the guide bulge, corresponding to the downstream flowing direction of the lubricating oil 6, is provided with a steep wall surface 1b, and the steep wall surface 1b is close to the pressure relief hole 1-2. When the mini-tiller operates, the clutch 4 rotates synchronously with an engine crankshaft 3, lubricating oil 6 filled in the gearbox 7 flows at a high speed along the circumferential direction of the inner wall of the gearbox 7 and the cavity 1-7 of the connecting end cover 1 under the rotating rubber of the clutch 4, the lubricating oil 6 flowing at a high speed flows to the annular groove 1-8 from the cavity 1-7, the lubricating oil 6 flowing at a high speed is guided by the guide slope surface 1a when passing through the guide bulge 1-1, after the lubricating oil 6 turns over the guide bulge 1-1 along the guide slope surface 1a, the lubricating oil 6 advances through the pressure relief hole 1-2 at the high-speed flowing speed, an air cavity 8 without the lubricating oil 6 is formed when passing through the steep wall surface 1b of the guide bulge 1-1 because the lubricating oil 6 is in a high-speed flowing state, the retention of the lubricating oil 6 cannot be formed, and the position of the air cavity 8 corresponds to the pressure relief hole 1-2, the air cavity 8 is communicated with the outside atmosphere through the pressure relief hole 1-2, and air in the air cavity 8 can be discharged into the outside atmosphere from the pressure relief hole 1-2, so that the balance between the pressure inside the gearbox 7 and the outside atmospheric pressure of the box body is kept. The top end of the guide slope surface 1a of the guide bulge 1-1 is lower than the notch surface of the annular groove 1-8, so that the lubricating oil 6 is prevented from leaking, and is higher than the pressure relief hole 1-2, so that the position of the air cavity 8 can correspond to the pressure relief hole 1-2, the pressure relief of the pressure relief hole 1-2 is ensured, and the lubricating oil 6 can be prevented from leaking from the pressure relief hole 1-2. The bottom end of the guide slope surface 1a and the groove bottoms of the annular grooves 1-8 are in smooth transition, so that the lubricating oil 6 can smoothly cross over the guide bulges 1-1 at a high speed under the driving of the clutch 4.

When the micro-cultivator is used in practice, lubricating oil 6 is filled in the gearbox 7, in order to ensure good lubricating effect, normally, one third of the clutch 4 is submerged by the lubricating oil 6 to be optimal, after the micro-cultivator is started, the clutch 4 rotates synchronously with an engine crankshaft 3, the lubricating oil 6 in the gearbox 7 flows at high speed along the inner wall of the gearbox 7 and the circumference of a concave cavity 1-7 under the rotation stirring of the clutch 4, the lubricating oil 6 flowing at high speed flows from the concave cavity 1-7 to an annular groove 1-8, when the lubricating oil flows through a guide bulge 1-1 in the annular groove 1-8, the lubricating oil 6 is guided by a guide slope surface 1a of the guide bulge 1-1 when the annular groove 1-8 flows through the guide bulge 1-1, after the guide slope surface 1a crosses the guide bulge 1-1, the lubricating oil 6 forms an undersize pressure relief hole 1-2 in a high-speed flowing state from the top of the guide slope surface 1a, so that the lubricating oil 6 cannot be retained near an air cavity 6 to the air cavity 1-2, and the air cavity 6 cannot be communicated with an air cavity 1-2 when the lubricating oil leakage angle of the guide bulge 1-1 is too large, the annular groove 2, the lubricating oil can not be formed by the guide bulge 1-2, and the lubricating oil can not be communicated with an annular groove 2, the air cavity 6 can not be caused by the guide bulge 2, and the lubricating oil can not be easily caused by the leakage angle of the guide bulge 1-2, so that the lubricating oil 6, the lubricating oil can be communicated with the lubricating oil 6, the air cavity 2, the air cavity 6 can be easily caused by the air cavity 6, the air leakage angle of the air cavity 2 is too small pressure of the air cavity 2, the air leakage angle of the guide bulge 2 is too-2, the air leakage angle of the air cavity 2 is too, the guide bulge 1-2, the air cavity 2 is too large angle of the air cavity 2 is too, the guide bulge 1-2, the air cavity 2, the guide bulge 2, the air cavity 2, the air.

According to the above embodiment, the utility model discloses a pressure release leak protection is respond well, and, direction arch 1-1 is the structure with connecting end cover 1 integrated into one piece, simple structure, and connecting end cover 1 wholeness is better, and pressure release hole 1-2 design can for the through-hole, need not carry out secondary operation to pressure release hole 1-2 again, has simplified processing technology, has practiced thrift the processing cost, and the assembly is also very simple and convenient.

Claims

1. A connecting end cover of a gearbox of a mini-tiller, wherein the connecting end cover (1) is of an integrally formed structure, one end of the connecting end cover (1) corresponding to a crankcase cover (2) of an engine is provided with a positioning boss (1-5), one end of the connecting end cover (1) corresponding to the cavity of a gearbox (7) is provided with a bearing seat (1-6), the center of the bearing seat (1-6) is provided with a shaft hole (1-9) penetrating through the positioning boss (1-5), the shaft hole (1-9) is used for inserting an engine crankshaft (3), an annular groove (1-8) for flowing lubricating oil (6) is arranged around the bearing seat (1-6), a concave cavity (1-7) communicated with the annular groove (1-8) is arranged below the bearing seat (1-6) on the connecting end cover (1), the connecting end cover (1) is provided with a plurality of first bolt holes (1-3) used for being connected with a gearbox (7) box body and a plurality of second bolt holes (1-4) used for being connected with an engine crankcase cover (2), and is characterized in that: the top of the connecting end cover (1) is provided with a pressure relief hole (1-2), the pressure relief hole (1-2) penetrates through the peripheral side wall of the annular groove (1-8) and is communicated with the annular groove (1-8), a guide bulge (1-1) is arranged in the annular groove (1-8), the guide bulge (1-1) extends towards the notch direction of the annular groove (1-8), one surface, corresponding to the upstream flowing direction of the lubricating oil (6), of the guide bulge (1-1) is provided with a guide slope surface (1 a), one surface, corresponding to the downstream flowing direction of the lubricating oil (6), of the guide bulge (1-1) is provided with a steep wall surface (1 b), the steep wall surface (1 b) is close to the pressure relief hole (1-2), the top end of the guide slope surface (1 a) of the guide bulge (1-1) is lower than the notch surface of the annular groove (, is higher than the pressure relief hole (1-2) on the side wall of the annular groove (1-8), and the bottom end of the guide slope surface (1 a) is in smooth transition with the bottom of the annular groove (1-8).

2. The connecting end cover of the gearbox of the mini-tiller according to claim 1, characterized in that an included angle α between a guide slope surface (1 a) of the guide protrusion (1-1) and the bottom of the annular groove (1-8) is 45-55 degrees.

3. The connecting end cover of the gearbox of the mini-tiller according to claim 1, wherein: the diameter of the pressure relief hole (1-2) is 3-4 mm.

4. The connecting end cover of the gearbox of the mini-tiller according to claim 1, wherein: the first bolt holes (1-3) are distributed on the periphery of the connecting end cover (1), and the second bolt holes (1-4) are uniformly distributed at the bottoms of the annular grooves (1-8) around the bearing seats (1-6).

5. The connecting end cover of the gearbox of the micro-cultivator of claim 1 or 4, wherein: the first bolt holes (1-3) are respectively arranged on flanges (1-10) arranged on the periphery of the connecting end cover (1).

6. The connecting end cover of the gearbox of the mini-tiller according to claim 1, wherein: the guide protrusion (1-1) is of a structure integrally formed with the connecting end cover (1).