A double-shell flywheel housing

Abstract

The present invention discloses a double-shell flywheel housing, which includes a gearbox housing, a rear housing and a front housing; the gearbox housing is distributed at the rear side of the rear housing; the front housing is detachably connected to the rear housing through mounting bolts. The upper left side and the upper right side of the rear housing are respectively provided with a left PTO power take-off port and a right PTO power take-off port; the upper left side and the upper right side of the front housing are respectively provided with hydraulic pump gear oil hole lugs corresponding to the left PTO power take-off port and the right PTO power take-off port; the rear housing is provided with a stress balance and slow-release frustum corresponding to the gearbox housing. The adoption of the present invention has the advantages of good reliability, convenient installation, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of high-power engines, and particularly relates to a double-shell flywheel housing. Background Art

[0002] The flywheel housing is one of the main accessories of the engine. It is installed between the engine and the transmission, externally connected to the crankcase, starter, and oil pan, and internally contains the flywheel assembly, playing the roles of connecting the body, protecting, and being a carrier. During the operation of the engine, it is required to maintain good stability and sealing performance. Noise, vibration, and harshness are the main technical indicators that need to be mainly considered during the design of the flywheel housing, and they are also a comprehensive indicator for measuring the manufacturing quality of automobiles. Currently, the stiffness and reliability of the flywheel housing are mainly adjusted by adjusting the layout of ribs, optimizing the structure, adjusting the wall thickness, adjusting the mass, and arranging the mounts, etc., to reduce vibration and noise, improve the riding comfort, and enhance the product competitiveness. The requirements for the flywheel housing of high-power engines are more stringent. The quality, vibration, and noise of the related components installed on the flywheel housing are greater, which puts forward new requirements for the high-efficiency assembly, anti-vibration performance, and rigidity of the flywheel housing, etc., and it also needs to meet the current lightweight design requirements. Summary of the Invention

[0003] The present invention provides a double-shell flywheel housing with good reliability for high-power engines in view of the above technical problems.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A double-shell flywheel housing includes a transmission housing, a rear housing, and a front housing; the transmission housing is distributed at the rear side of the rear housing; the front housing is detachably connected to the rear housing through mounting bolts.

[0006] Further, a left PTO power take-off port and a right PTO power take-off port are respectively provided at the upper left side and the upper right side of the rear housing; hydraulic pump gear oil hole lugs are respectively provided at the upper left side and the upper right side of the front housing corresponding to the left PTO power take-off port and the right PTO power take-off port; the rear housing is provided with a stress balance and slow-release round platform corresponding to the transmission housing.

[0007] Further, a left idler gear mounting seat and a right idler gear mounting seat are further provided inside the front housing; a left idler gear oil hole lug is further provided at the front end of the front housing corresponding to the left idler gear mounting seat.

[0008] Further, the right idler gear mounting seat and the hydraulic pump gear oil hole lugs adopt a "rice" - shaped reinforcing rib group; a plurality of flywheel housing mounting holes are longitudinally arranged along the middle inside the front housing, and these flywheel housing mountings are connected in a line through reinforcing ribs.

[0009] Further, a crankshaft head center hole is formed in the middle of the transmission housing; a plurality of "V"-shaped reinforcing rib groups are arranged along the outer periphery of the crankshaft head center hole, and a peripheral wall reinforcing rib is arranged along the outer ends of the "V"-shaped reinforcing rib groups.

[0010] Further, left and right mounting towers are respectively arranged at corresponding middle positions on the left and right sides of the transmission housing; a starter hole is formed in the right mounting tower, and the starter hole is distributed outside the rear housing.

[0011] Further, the transmission housing is distributed at the lower middle part at the rear of the rear housing, and the lower right part of the transmission housing is in a suspended state.

[0012] Further, a crankshaft head through port is correspondingly formed in the middle and lower part of the front housing, a camshaft seal groove is further arranged at the front end of the front housing, and an oil return passage is further arranged below the camshaft seal groove.

[0013] Further, an engine oil filling port is further formed at the middle position of the top of the rear housing.

[0014] Further, a plurality of anti-tearing rib strips are arranged along the radial direction at the left PTO take-off port and the right PTO take-off port; a "cross"-shaped reinforcing rib is further arranged between the left PTO take-off port and the right PTO take-off port to connect a stress equalization and relief round table.

[0015] Advantages of the present invention compared with the prior art:

[0016] (1) By dividing the flywheel housing into three parts, namely a transmission housing, a rear housing and a front housing, the transmission is distributed in the transmission housing and then combined through the rear housing, and the idle gear and the like are assembled on the front housing, and then the rear housing and the front housing are tightly connected by bolts. With the above structure, especially for high-power engines, it can effectively relieve the vibration from each relevant heavy gear train, effectively decompose the local stress of each large gear train, significantly improve the anti-vibration performance and strength of the entire flywheel housing, and improve the reliability. Compared with the traditional design, no crack damage and other phenomena will occur due to excessive local stress after long-term use.

[0017] (2) By combining the adoption of "rice"-shaped reinforcing rib groups and "V"-shaped reinforcing rib groups and reasonably arranging the PTO take-off port, camshaft, left mounting tower and right mounting tower, etc., the vibration and noise / rattle of the entire flywheel housing can be effectively reduced. And effectively reducing the vibration can significantly reduce the local stress burden of the relevant parts of the housing after use, thereby improving the reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front side elevation view of the rear housing of the present invention;

[0019] Figure 2 is the rear side front view of the front housing of the present invention;

[0020] Figure 3 is the exploded structural schematic diagram of the front housing and the rear housing of the present invention from the left rear side;

[0021] Figure 4 is the exploded structural schematic diagram of the front housing and the rear housing of the present invention from the right front side;

[0022] Figure 5 is the structural schematic diagram of the combined front housing and rear housing of the present invention;

[0023] Figure 6a is the CAE analysis diagram of the present invention in the rear direction;

[0024] Figure 6b is the CAE analysis diagram of the present invention in the rear direction;

[0025] Figure 6c is the CAE analysis diagram of the right side of the present invention in the front direction;

[0026] Figure 6d is the CAE analysis diagram of the left side of the present invention in the front direction;

[0027] Figure 6e is the CAE analysis diagram of the left side of the present invention in the front direction;

[0028] Figure 7 is the displacement distribution nephogram of the present invention (upward load condition);

[0029] Figure 8 is the displacement distribution nephogram of the present invention (rightward load condition). Detailed implementation manners

[0030] Such as Figures 1 to 5As shown in the figure, a double-shell flywheel housing includes a transmission housing 5, a rear housing 3 and a front housing 1; the transmission housing 5 is distributed at the rear side of the rear housing 3; the front housing 1 is detachably connected to the rear housing 3 by tightening the mounting bolts 2 into the bolt holes 6, and the rear housing is provided with a stress balance and relief frustum 5-3 corresponding to the transmission housing; that is, in the traditional one-piece structure, the stress is completely eliminated by the material itself, while in the present invention, by creatively adopting the structure of the rear housing 3 and the front housing 1, it can significantly reduce the phenomenon of poor stress distribution and easy cracking and damage of the transmission housing of the high-power engine and the front housing. At the same time, the overall vibration generated by the front and rear gear trains is also significantly weakened, and the reliability is significantly improved. The upper left side and the upper right side of the rear housing 3 are respectively provided with a left PTO power take-off port 14 and a right PTO power take-off port 10, and corresponding power take-off port covers 23 are also provided; the upper left side and the upper right side of the front housing are respectively provided with a first hydraulic pump gear oil hole boss 16 and a second hydraulic pump gear oil hole boss 19 corresponding to the left PTO power take-off port 14 and the right PTO power take-off port 10. A left idle gear mounting seat 26 and a right idle gear mounting seat 27 are also provided in the front housing 1; a left idle gear oil hole boss 17 is also provided at the front end of the front housing 1 corresponding to the left idle gear mounting seat 26. The right idle gear mounting seat and the hydraulic pump gear oil hole boss adopt a "rice" shaped reinforcing rib group 28. A plurality of flywheel housing mounting holes 24 are also provided longitudinally along the middle part of the front housing 1, and these flywheel housing mountings are connected in a line by a reinforcing rib 25.

[0031] A crankshaft head center hole 7 is provided in the middle of the transmission housing 5; a number of "V"-shaped reinforcing rib groups 5-1 are arranged along the outer periphery of the crankshaft head center hole 7, and a peripheral wall reinforcing rib 5-2 is arranged along the outer ends of the "V"-shaped reinforcing rib groups 5-1. The transmission housing 5 is strengthened by the "V"-shaped reinforcing rib groups 5-1 + the peripheral wall reinforcing rib 5-2. At the middle positions on the left and right sides of the transmission housing 5, a left mounting tower 4 and a right mounting tower 9 are respectively provided; a starter hole 20 is provided in the right mounting tower 9, and a mounting tower weight reduction cavity 8 is provided on one side thereof. The starter hole 20 is distributed outside the rear housing 3, that is, the transmission housing 5 is distributed at the lower middle part behind the rear housing, and the lower right part of the transmission housing is in a suspended state. With the above structure, the vibration and stress impact from the gear train of the transmission housing 5 to the front housing can be minimized, and it also effectively reduces the mutual stress impact between the gear trains of the front and rear housings, and accumulates the stress fully at a number of mounting bolts 2. A crankshaft head through port 18 is correspondingly provided in the middle and lower part of the front housing 1, a camshaft seal groove 21 is provided at the front end of the front housing 1, and an oil return passage 22 is provided below the camshaft seal groove 21, which is used for distributing the camshaft; an engine oil filling port 12 is provided at the middle position of the top of the rear housing 3, and a first relief hole 13 and a second relief hole 11 are respectively provided corresponding to the left idler gear mounting seat 26 and the right idler gear mounting seat 27. A number of anti-tearing ribs 15 are arranged radially at the left PTO take-off port and the right PTO take-off port, and the left PTO take-off port and the right PTO take-off port are also strengthened and connected by a "cross"-shaped reinforcing rib 29 to balance and relieve the stress of the stress relief round table 5-3.

[0032] For the above structure of the present invention, to prove its beneficial effects, the applicant also carried out a CAE analysis on it as Figures 6a to 6e shown. By using the housing material QT450 for CAE analysis, with the support of the above relevant structure, the maximum stress of the entire housing in the analysis is only 237 Mpa, which is significantly lower than the tensile strength of the material, 450 Mpa. As Figure 6b shown in, the maximum stress in the key connection area / easy cracking area above the starter hole 20 is only 237 Mpa. It shows that the design of this structure has outstanding substantial effects.

[0033] At the same time, in order to verify the load condition effect, the applicant also carried out a displacement distribution simulation / calculation of relevant key parameters of the present invention under the load condition, with reference to Figures 7 to 8 , and the calculation results are as follows in the table:

[0034] Table 1

[0035]

[0036] As Figure 7Displacement distribution nephogram (upward load condition) in and Figure 8 Displacement distribution nephogram (rightward load condition) in. It can be seen from Table 1 that for the flywheel housing constructed by the present invention, both the static strength safety factor value and the fatigue strength safety factor value are significantly higher than the standard values, and the highest can reach up to 4.17, indicating that this structure has high tolerance rigidity under high loads and good reliability.

Claims

1. A double-shell flywheel housing, characterized in that, it includes a transmission housing, a rear housing and a front housing; the transmission housing is distributed at the rear side of the rear housing; the front housing is detachably connected to the rear housing through mounting bolts; the rear housing is provided with a stress balance and relief frustum corresponding to the transmission housing; a crankshaft head center hole is opened in the middle of the transmission housing; a number of "V"-shaped reinforcing rib groups are provided along the outer circumference of the crankshaft head center hole, and a peripheral wall reinforcing rib is provided along the outer ends of the "V"-shaped reinforcing rib groups; left and right mounting towers are respectively provided at the middle positions on the left and right sides of the transmission housing; a starter hole is opened in the right mounting tower, and the starter hole is distributed outside the rear housing; the transmission housing is distributed at the lower middle rear side of the rear housing, and the lower right side part of the transmission housing is in a suspended state; a left PTO power take-off port and a right PTO power take-off port are respectively provided at the upper left side and the upper right side of the rear housing; a "cross"-shaped reinforcing rib is also provided between the left PTO power take-off port and the right PTO power take-off port to connect the stress balance and relief frustum.

2. A double-shell flywheel housing according to claim 1, characterized in that, hydraulic pump gear oil hole lugs are respectively provided at the upper left side and the upper right side of the front housing corresponding to the left PTO power take-off port and the right PTO power take-off port.

3. A double-shell flywheel housing according to claim 2, characterized in that, a left idler gear mounting seat and a right idler gear mounting seat are further provided in the front housing; a left idler gear oil hole lug is further provided at the front end of the front housing corresponding to the left idler gear mounting seat.

4. A double-shell flywheel housing according to claim 3, characterized in that, a "rice"-shaped reinforcing rib group is adopted for the right idler gear mounting seat and the hydraulic pump gear oil hole lugs; a number of flywheel housing mounting holes are also provided longitudinally along the middle of the front housing, and these flywheel housing mountings are connected in a line through reinforcing ribs.

5. A double-shell flywheel housing according to claim 1, characterized in that, a crankshaft head through port is correspondingly opened at the middle and lower part of the front housing, a camshaft seal groove is further provided at the front end of the front housing, and an oil return channel is further provided at the lower part of the camshaft seal groove.

6. A double-shell flywheel housing according to claim 1, characterized in that, an engine oil filling port is further opened at the middle position of the top of the rear housing.

7. A double-shell flywheel housing according to claim 2, characterized in that, a number of anti-tearing ribs are also provided radially at the left PTO power take-off port and the right PTO power take-off port.

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