A cooling method for a forced cooling structure of a temperature-controlled diesel engine rear oil seal

Abstract

The present invention discloses a cooling method for a temperature-controlled diesel engine rear oil seal forced cooling structure, comprising an engine cylinder body and a flywheel housing fixed on the engine cylinder body, the flywheel housing being provided with a rear oil seal mounting hole, the engine cylinder body being provided with a lubricating oil cooling channel and an oil pump for guiding lubricating oil to the rear oil seal mounting hole, and a rear oil seal cooling ring groove connected to the lubricating oil cooling channel being coaxially fixed on the hole wall of the rear oil seal mounting hole. The temperature-controlled diesel engine rear oil seal forced cooling structure designed by the present invention pumps engine oil into the engine cylinder body through an oil pump, guides the engine oil to the rear end of the cylinder body through the lubricating cooling oil channel arranged in the cylinder body, and the rear end engine oil is forced to cool the rear oil seal through two channels.

Description

Technical Field

[0001] The invention relates to the technical field of automobile engine equipment, in particular to a cooling method for a temperature-controlled diesel engine rear oil seal forced cooling structure. Background Art

[0002] The rear oil seal of a diesel engine is used for rotating seal of the crankshaft, and is press-fitted on the flywheel housing and the crankshaft. When the crankshaft rotates at high speed, the temperature of the lip of the rear oil seal in contact with the crankshaft is very high. The rear oil seal of a diesel engine in the prior art relies on the atomized oil or oil droplets in the crankcase to cool it.

[0003] Patent application number 201210554103.3, entitled "A Crankshaft Rear Oil Seal Rapid Cooling and Lubrication Structure", discloses an oil seal lubrication structure, which provides a crankshaft rear oil seal rapid cooling and lubrication structure with a simple structure, which can effectively improve the lubrication state of the crankshaft rear oil seal and the crankshaft, reduce the temperature of the friction part, and extend the service life of the crankshaft rear oil seal. It solves the problem in the prior art that the crankshaft rear oil seal is prone to aging due to friction temperature rise, which aggravates the carbon deposition on the lip and increases the friction of the crankshaft journal. The crankshaft journal is scratched, and in severe cases, the oil seal fails, the lubricating oil of the crankcase leaks, and further leads to technical problems such as a decrease in engine power. It includes a crankshaft rear oil seal and a crankshaft rear oil seal cover which are mounted on the crankshaft on the cylinder block. The crankshaft rear oil seal cover is arranged outside the crankshaft rear oil seal and encapsulates the crankshaft rear oil seal between the cylinder block and the crankshaft rear oil seal cover. An oil hole is provided on the end face of the cylinder block, and the inner end of the oil hole is connected to the main oil channel in the cylinder block, and the outer end of the oil hole is connected to the crankshaft rear oil seal.

[0004] The patent with application number 201020627260.9 and title “An Engine Cooler Cover” discloses an engine cooler cover, including a cooler cover body, wherein a water pump chamber for accommodating a water pump driving impeller is integrally provided on the front end surface of the cooler cover body.

[0005] In the prior art, the cooling of the rear oil seal is non-forced cooling. When the crankshaft rotates at high speed, the atomized oil or splashing oil droplets have limited and random cooling effects on the rear oil seal. The high temperature of the rear oil seal lip may cause local oil gelling and lip aging, affecting the oil quality and sealing failure of the rear oil seal. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide a cooling method for a temperature-controlled diesel engine rear oil seal forced cooling structure that can force cooling of the rear oil seal, avoid oil gelling and lip aging, and ensure oil quality.

[0007] To achieve this purpose, the temperature-controlled diesel engine rear oil seal forced cooling structure designed in the present invention includes an engine cylinder block and a flywheel housing fixed to the engine cylinder block, the flywheel housing is provided with a rear oil seal mounting hole, the engine cylinder block is provided with a lubricating oil cooling channel and an oil pump for guiding the lubricating oil to the rear oil seal mounting hole, and a rear oil seal cooling ring groove connected to the lubricating oil cooling channel is coaxially fixed on the hole wall of the rear oil seal mounting hole.

[0008] Furthermore, a rear end plate is fixed between the engine cylinder block and the flywheel housing, and a rear oil seal oil inlet port communicating with the rear oil seal cooling ring groove and the lubricating oil cooling channel is provided on the rear end plate.

[0009] Furthermore, the rear oil seal oil inlet is located directly above the middle of the rear oil seal cooling ring groove.

[0010] Furthermore, the lubricating oil cooling channel includes a lubricating oil cylinder internal guide section opened in the engine cylinder body and a lubricating oil cylinder end face guide section opened on the end face of the engine cylinder body, and the rear oil seal oil outlet is connected to the bottom oil outlet of the lubricating oil cylinder end face guide section.

[0011] Furthermore, the lubricating oil cylinder end face guide section is located above the rear oil seal oil extraction port.

[0012] Furthermore, a nozzle mounting hole for mounting a cooling nozzle is provided on the rear end plate, and the nozzle mounting hole is communicated with the end face guide section of the lubricating oil cylinder body.

[0013] Furthermore, the nozzle mounting hole is located directly above the rear oil seal mounting hole.

[0014] Furthermore, the rear oil seal cooling ring groove is provided with a plurality of rear oil seal oil outlets communicated with the rear oil seal mounting hole at intervals along its circumference.

[0015] Furthermore, a temperature sensor for detecting the temperature of the rear oil seal is fixed on the flywheel housing.

[0016] Furthermore, the temperature sensor is located below the rear oil seal mounting hole.

[0017] The beneficial effects of the present invention are as follows: the temperature-controlled diesel engine rear oil seal forced cooling structure designed by the present invention pumps the engine oil into the engine cylinder body through the oil pump, and guides the engine oil to the rear end of the cylinder body through the lubricating cooling oil channel arranged in the cylinder body, and the rear end engine oil is forced to cool the rear oil seal through two channels: channel one, a hole is opened on the rear end plate, a rear oil seal cooling ring groove is arranged in the flywheel housing, the rear oil seal cooling ring groove takes oil from the hole of the rear end plate and has small holes in the circumference, and the small holes can form a forced spray on the rear oil seal, and the rear oil seal cooling ring groove can form indirect cooling of the engine oil to the rear oil seal, and the lower part of the rear oil seal cooling ring groove is opened to ensure the recycling of the engine oil. Channel two, a cooling nozzle is arranged on the rear end plate to spray the engine oil to the rear oil seal to form forced cooling. A temperature sensor is arranged on the flywheel housing near the rear oil seal, and its signal can be fed back to the electronically controlled engine oil pump to automatically adjust the pump oil volume to ensure that the maximum temperature of the rear oil seal does not exceed 120°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of the forced cooling structure of the rear oil seal of a temperature-controlled diesel engine according to the present invention;

[0019] Figure 2 It is a schematic diagram of the arrangement of the lubricating and cooling oil passages in the forced cooling structure of the rear oil seal of a temperature-controlled diesel engine in the present invention;

[0020] Figure 3 It is a front view of the end face of the engine cylinder block in the present invention;

[0021] Figure 4 It is a front view of the rear end plate in the present invention;

[0022] Figure 5 It is a front view of the end face of the flywheel housing in the present invention;

[0023] Among them, 1 is the engine block, 2 is the flywheel housing, 3 is the rear end plate, 4 is the rear oil seal mounting hole, 5 is the rear oil seal cooling ring groove, 6 is the rear oil seal oil intake port, 7 is the lubricating oil cylinder internal guide section, 8 is the lubricating oil cylinder end face guide section, 9 is the cooling nozzle, 10 is the nozzle mounting hole, 11 is the rear oil seal oil outlet port, and 12 is the temperature sensor. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] like Figure 1 —5 shows a temperature-controlled diesel engine rear oil seal forced cooling structure, comprising an engine block 1 and a flywheel housing 2 fixed on the engine block 1, a rear end plate 3 fixed between the engine block 1 and the flywheel housing 2, a rear oil seal mounting hole 4 is provided on the flywheel housing 2, a lubricating oil cooling channel and an oil pump for guiding the lubricating oil to the rear oil seal mounting hole 4 are provided in the engine block 1, a rear oil seal cooling ring groove 5 connected to the lubricating oil cooling channel is coaxially fixed on the hole wall of the rear oil seal mounting hole 4, and a rear oil seal oil outlet 6 connected to the rear oil seal cooling ring groove 5 and the lubricating oil cooling channel is provided on the rear end plate 3.

[0026] like Figure 4 As shown, the rear oil seal oil inlet 6 is located just above the middle of the rear oil seal cooling ring groove 5 .

[0027] like Figure 2 As shown in FIG. 3 , the lubricating oil cooling channel includes a lubricating oil cylinder internal guide section 7 opened in the engine cylinder block 1 and a lubricating oil cylinder end face guide section 8 opened on the end face of the engine cylinder block 1. The rear oil seal oil inlet 6 is connected to the bottom oil outlet of the lubricating oil cylinder end face guide section 8. The lubricating oil cylinder end face guide section 8 is located above the rear oil seal oil inlet 6.

[0028] like Figure 4 As shown, a nozzle mounting hole 10 for mounting a cooling nozzle 9 is provided on the rear end plate 3 , and the nozzle mounting hole 10 is communicated with the lubricating oil cylinder end face guide section 8 , and the nozzle mounting hole 10 is located directly above the rear oil seal mounting hole 4 .

[0029] like Figure 5 As shown, the rear oil seal cooling ring groove 5 is provided with a plurality of rear oil seal oil outlets 11 which are connected to the rear oil seal mounting hole 4 at intervals along its circumference. Figure 1 As shown, a temperature sensor 12 for detecting the temperature of the rear oil seal is fixed on the flywheel housing 2 , and the temperature sensor 12 is located below the rear oil seal mounting hole 4 .

[0030] The temperature-controlled diesel engine rear oil seal forced cooling structure designed by the present invention pumps the engine oil into the engine cylinder 1 through an oil pump, and guides the engine oil to the rear end of the cylinder through the lubricating cooling oil channel arranged in the cylinder body. The rear end engine oil is forced to cool the rear oil seal through two channels: channel 1, a hole is opened on the rear end plate 3, a rear oil seal cooling ring groove 5 is arranged in the flywheel housing 2, and the rear oil seal cooling ring groove 5 takes oil from the hole of the rear end plate 3 (rear oil seal oil intake port 6), and the rear oil seal cooling ring groove 5 is circumferentially provided with small holes, and the small holes can form forced spraying of the rear oil seal, and the rear oil seal cooling ring groove 5 can form indirect cooling of the rear oil seal by the engine oil, and the lower part of the rear oil seal cooling ring groove 5 is opened to ensure the circulation of the engine oil. Channel 2, a cooling nozzle 9 is arranged on the rear end plate 3 to spray the engine oil to the rear oil seal to form forced cooling. A temperature sensor 12 is arranged on the flywheel housing 2 near the rear oil seal, and its signal can be fed back to the electronically controlled oil pump to automatically adjust the pump oil volume to ensure that the maximum temperature of the rear oil seal does not exceed 120°C.

[0031] When describing a positional relationship, for example, when the positional sequence is described as "on ...", "above ...", "below ..." and "next", unless words or terms such as "just" or "directly" are used, situations where they are not in contact or in contact may also be included. If it is mentioned that a first element is "on" a second element, it does not mean that the first element must be above the second element in the figure. The upper and lower parts of the component will change according to the change of the angle and orientation of observation. Therefore, in the drawings or in the actual construction, if it is involved that the first element is "on" the second element, the situation where the first element is "below" the second element and the situation where the first element is "above" the second element may be included. When describing a temporal relationship, unless "just" or "directly" is used, when describing "after", "subsequently", "subsequently" and "before", situations where the steps are not continuous may be included. The features of various embodiments of the present invention may be partially or completely combined or spliced ​​with each other, and may be performed in various different configurations as can be fully understood by those skilled in the art. The embodiments of the present invention may be performed independently of each other, or may be performed together in a mutually dependent relationship.

[0032] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be construed as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims. In the case of using "including", "having" and "comprising" described in this specification, there may also be another part or other parts, and the terms used may generally be singular but may also represent plural forms. Finally, it should be pointed out that the above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there may be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall be deemed to belong to the protection scope of the present invention.

Claims

1. A cooling method for a temperature-controlled diesel engine rear oil seal forced cooling structure, the temperature-controlled diesel engine rear oil seal forced cooling structure comprising an engine cylinder block (1) and a flywheel housing (2) fixed to the engine cylinder block (1), the flywheel housing (2) being provided with a rear oil seal mounting hole (4), characterized in that: The engine cylinder block (1) is provided with a lubricating oil cooling channel and an oil pump for guiding lubricating oil to the rear oil seal mounting hole (4); a rear oil seal cooling ring groove (5) communicating with the lubricating oil cooling channel is coaxially fixed on the hole wall of the rear oil seal mounting hole (4); A rear end plate (3) is fixed between the engine cylinder block (1) and the flywheel housing (2), and a rear oil seal oil extraction port (6) communicating with the rear oil seal cooling ring groove (5) and the lubricating oil cooling channel is provided on the rear end plate (3); The lubricating oil cooling channel comprises a lubricating oil cylinder internal guide section (7) opened in the engine cylinder (1) and a lubricating oil cylinder end face guide section (8) opened on the end face of the engine cylinder (1), and the rear oil seal oil extraction port (6) is in communication with the bottom oil outlet of the lubricating oil cylinder end face guide section (8); The rear end plate (3) is provided with a nozzle mounting hole (10) for mounting a cooling nozzle (9), and the nozzle mounting hole (10) is connected to the lubricating oil cylinder end face guide section (8); The rear oil seal cooling ring groove (5) is provided with a plurality of rear oil seal oil outlets (11) which are communicated with the rear oil seal mounting hole (4) at intervals along its circumference; A temperature sensor (12) for detecting the temperature of the rear oil seal is fixed on the flywheel housing (2); The cooling method of the temperature-controlled diesel engine rear oil seal forced cooling structure comprises pumping engine oil into an engine cylinder (1) through an oil pump, directing the engine oil to the rear end of the cylinder through a lubricating cooling oil channel arranged in the cylinder, and forcing the rear oil seal to be cooled through two channels: channel one, the rear oil seal cooling ring groove (5) takes oil from the rear oil seal oil intake port (6), and small holes opened in the circumference of the rear oil seal cooling ring groove (5) forcefully spray the rear oil seal; channel two, through a cooling nozzle (9) arranged on the rear end plate (3), spraying the engine oil to the rear oil seal to form forced cooling; and feeding back the signal of the temperature sensor (12) to the electronically controlled engine oil pump, automatically adjusting the pumping oil volume, and ensuring that the maximum temperature of the rear oil seal does not exceed 120°C.

2. The cooling method of the temperature-controlled diesel engine rear oil seal forced cooling structure according to claim 1, characterized in that: The rear oil seal oil inlet (6) is located just above the middle of the rear oil seal cooling ring groove (5).

3. The cooling method of the temperature-controlled diesel engine rear oil seal forced cooling structure according to claim 1, characterized in that: The lubricating oil cylinder end face guide section (8) is located above the rear oil seal oil extraction port (6).

4. The cooling method of the temperature-controlled diesel engine rear oil seal forced cooling structure according to claim 1, characterized in that: The nozzle mounting hole (10) is located directly above the rear oil seal mounting hole (4).

5. The cooling method of the temperature-controlled diesel engine rear oil seal forced cooling structure according to claim 1, characterized in that: The temperature sensor (12) is located below the rear oil seal mounting hole (4).

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