A lubricating structure of a front bearing of an upper intermediate shaft of a double-intermediate-shaft transmission main case

Abstract

A lubrication structure for the front bearing of the upper intermediate shaft in a dual intermediate shaft transmission main housing includes a main housing oil pipe located within the transmission housing cavity and above the upper intermediate shaft assembly. One end of the main housing oil pipe is connected to the oil pump outlet, and the other end is sealed and fixed to the transmission housing sidewall above the front bearing of the upper intermediate shaft. An inclined oil hole is provided near the other end of the main housing oil pipe, and the oil jet line from the inclined oil hole intersects with the transmission housing sidewall above the front bearing of the upper intermediate shaft. Through a rational arrangement of the component structure, oil from the oil pump is forced into the main housing oil pipe from the oil pump outlet and sprayed onto the transmission housing sidewall above the front bearing of the upper intermediate shaft through the inclined oil hole. The oil then flows into the front bearing of the upper intermediate shaft. This achieves forced lubrication of the front bearing of the upper intermediate shaft in a low-cost manner with minimal modifications to the component structure, significantly reducing the bearing's failure rate and improving the reliability and service life of the transmission assembly.

Description

Technical Field

[0001] This utility model belongs to the field of transmission technology, specifically relating to a lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission. Background Technology

[0002] In the field of mechanical transmission, various friction pairs such as gears, bearings, synchronizers, differentials, and oil seals require sufficient lubrication and cooling to prevent abnormal failures. Bearings, as key components in all mechanical transmission systems, directly determine the service life of the transmission system to a certain extent. The main failure mode of bearings is high-temperature ablation; therefore, addressing high-temperature ablation of bearings is a crucial issue that must be considered in all mechanical transmission fields. In the field of transmissions, special operating conditions such as heavy loads, low speeds, and hill climbing place significant challenges on the transmission's service life. Building upon traditional splash lubrication, more and more designers are focusing on and applying forced lubrication systems to lubricate and cool critical internal components of the transmission, thereby improving the overall service life and reliability of the transmission assembly.

[0003] For the front bearing of the upper intermediate shaft in a dual-intermediate-shaft transmission, its high-positioned and relatively enclosed environment makes splash lubrication difficult. Existing forced lubrication systems largely neglect the lubrication of this bearing. However, statistical analysis of market failure data shows that the failure risk of the front bearing of the upper intermediate shaft in a high-torque, medium-to-heavy-load dual-intermediate-shaft transmission cannot be ignored. Therefore, it is urgent to solve the lubrication problem of the front bearing of the upper intermediate shaft in a high-torque, medium-to-heavy-load dual-intermediate-shaft transmission, which is extremely important for improving the service life and reliability of the transmission assembly. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission, thereby solving the lubrication problem of the front bearing of the intermediate shaft on the main gearbox of a high-torque, medium-to-heavy-load dual intermediate shaft transmission.

[0005] To achieve the above objectives, the technical solution adopted by this utility model includes:

[0006] A lubrication structure for the front bearing of the upper intermediate shaft in a dual intermediate shaft transmission main housing includes a main housing oil pipe located in the inner cavity of the transmission housing and above the upper intermediate shaft assembly. One end of the main housing oil pipe is connected to the oil pump outlet, and the other end of the main housing oil pipe is sealed and fixed to the transmission housing side wall above the front bearing of the upper intermediate shaft. An inclined oil hole is provided on the side wall near the other end of the main housing oil pipe, and the oil jet line of the inclined oil hole intersects with the transmission housing side wall above the front bearing of the upper intermediate shaft.

[0007] Preferably, the main gearbox oil pipe is located diagonally above the intermediate shaft drive gear.

[0008] Preferably, the main oil pipe is provided with multiple nozzles facing the upper intermediate shaft assembly.

[0009] Preferably, the outer periphery of the upper intermediate shaft front bearing is provided with two first oil-blocking bosses, and the line connecting the two first oil-blocking bosses does not intersect with the axis of the upper intermediate shaft front bearing; an even number of second oil-blocking bosses are symmetrically provided on the outer periphery of the upper intermediate shaft front bearing between the two first oil-blocking bosses.

[0010] Preferably, the first oil-blocking boss is rectangular and the second oil-blocking boss is L-shaped.

[0011] Preferably, the side of the first oil stop boss and the second oil stop boss that contacts the transmission housing is lower than the other side of the first oil stop boss and the second oil stop boss.

[0012] Preferably, the adjacent second oil-blocking bosses are arranged at equal intervals with the first oil-blocking bosses / second oil-blocking bosses.

[0013] Preferably, a lubricating oil passage is provided in the side wall of the transmission housing opposite to the front bearing of the upper intermediate shaft, and the two ends of the lubricating oil passage are respectively connected to one end of the main oil pipe and the oil pump outlet.

[0014] Preferably, an external water cooling system is connected between the lubricating oil passage and the oil pump outlet.

[0015] Preferably, a gap is left between the intermediate shaft drive gear and the adjacent transmission housing sidewall.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] (1) The present invention provides a lubrication structure for the front bearing of the upper intermediate shaft of the main gearbox of a dual intermediate shaft transmission. By rationally setting the component structure, the oil in the oil pump is forced into the oil pipe of the main gearbox from the oil pump outlet, and the oil is sprayed from the inclined oil hole onto the side wall of the transmission housing above the front bearing of the upper intermediate shaft. The oil flows into the front bearing of the upper intermediate shaft. Under the premise of minimal modification to the component structure, forced lubrication of the front bearing of the upper intermediate shaft is achieved in a low-cost manner. This greatly reduces the failure rate of the bearing and improves the reliability and service life of the transmission assembly.

[0018] (2) The lubrication structure of the front bearing of the intermediate shaft on the main box of the dual intermediate shaft transmission of this utility model, through the reasonable setting of the component structure, only requires local modification of the mold of the transmission housing and the addition of an inclined oil hole to the oil pipe of the main box. The manufacturing difficulty is low and it is easy to realize quickly, with minimal increase in cost.

[0019] (3) The lubrication structure of the front bearing of the intermediate shaft on the main gearbox of the dual intermediate shaft transmission of this utility model has good portability and can be applied to other dual intermediate shaft transmission products of the same type to improve and solve the lubrication problem of the front bearing of the intermediate shaft on the main gearbox. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the lubrication structure of the front bearing of the intermediate shaft on the main gearbox of the dual intermediate shaft gearbox of this utility model.

[0022] Figure 2 for Figure 1 Schematic diagram of section AA;

[0023] Figure 3 for Figure 1 Schematic diagram of the structure of section BB;

[0024] Figure 4 for Figure 3 Schematic diagram of the CC section;

[0025] Figure 5 A schematic diagram of the lubrication of the front bearing of the intermediate shaft on the main housing.

[0026] The labels in the diagram represent:

[0027] 1-Transmission housing; 2-Main gearbox oil pipe; 3-Upper intermediate shaft assembly; 4-Intermediate shaft drive gear; 5-Upper intermediate shaft front bearing; 6-Lubricating oil passage; 7-Oil pump outlet;

[0028] 5-1-First oil baffle boss; 5-2-Second oil baffle boss. Detailed Implementation

[0029] The utility model is not limited to the following specific embodiments. All equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0030] It should be noted that the directional terms mentioned in this article, such as "inner cavity" and "inner wall", are consistent with the specific directions on the paper in the drawings of the specification or the corresponding directions of the space shown in the drawings; all components and devices in this utility model, unless otherwise specified, adopt components and devices known in the prior art.

[0031] Example

[0032] This embodiment discloses a lubrication structure for the front bearing of the upper intermediate shaft of a dual intermediate shaft transmission main housing. It includes a main housing oil pipe 2 located in the inner cavity of the transmission housing 1 and above the upper intermediate shaft assembly 3. One end of the main housing oil pipe 2 is connected to the oil pump outlet 7, and the other end of the main housing oil pipe 2 is sealed and fixed to the side wall of the transmission housing 1 above the front bearing of the upper intermediate shaft 5. An inclined oil hole is provided on the side wall of the main housing oil pipe 2 near its other end, and the oil jet line of the inclined oil hole intersects with the side wall of the transmission housing 1 above the front bearing of the upper intermediate shaft 5.

[0033] Its function is as follows: the oil in the oil pump is forced into the main gearbox oil pipe 2 from the oil pump outlet 7, and the oil is sprayed from the inclined oil hole onto the side wall of the transmission housing 1 above the upper intermediate shaft front bearing 5. The oil flows into the upper intermediate shaft front bearing 5. With minimal changes to the component structure, forced lubrication of the upper intermediate shaft front bearing 5 is achieved in a low-cost manner, thereby improving the reliability and service life of the transmission assembly.

[0034] In this embodiment, a lubrication oil passage 6 is provided in the side wall of the transmission housing 1 opposite to the upper intermediate shaft front bearing 5. Both ends of the lubrication oil passage 6 are connected to one end of the main oil pipe 2 and the oil pump outlet 7, respectively. An external water cooling system is connected between the lubrication oil passage 6 and the oil pump outlet 7. Figure 2 As shown, the high-temperature oil inside the transmission flows out from the oil pump outlet 7 and enters the external water cooling system for cooling. The cooled low-temperature oil is then sent back into the lubrication channel 6 on the partition wall of the transmission housing 1. The low-temperature oil flows into the lubrication channel 6 and enters the main gearbox oil pipe 2. The main gearbox oil pipe 2 is provided with multiple nozzles facing the upper intermediate shaft assembly 3. The low-temperature oil is sprayed out from the multiple nozzles on the main gearbox oil pipe 2, thereby achieving forced lubrication of the meshing pairs of gears in each gear position on the upper intermediate shaft assembly 3.

[0035] like Figure 3 As shown, the main oil pipe 2 is located diagonally above the intermediate shaft drive gear 4. The inclined oil hole at point M on the main oil pipe 2 sprays oil onto point N on the inner side P of the front end of the transmission housing 1. Point N is near the highest point of the tooth tip of the intermediate shaft drive gear 4.

[0036] like Figure 4 As shown, due to the constraints of the transmission assembly structure, there is a 2.5mm to 3mm gap between the inner front surface P of the transmission housing 1 and the front surface Q of the intermediate shaft transmission gear 4. This gap is completely blocked just below the front support position of the main oil pipe 2. Therefore, this embodiment, based on existing fluid simulation analysis and calculation, and determining the angle and position of the inclined oil hole at point M on the main oil pipe 2 according to actual working conditions, effectively ensures that the low-temperature lubricating oil injected from the inclined oil hole at point M is sprayed precisely onto point N of the inner front surface P of the transmission housing 1.

[0037] Specifically, the outer periphery of the upper intermediate shaft front bearing 5 is provided with two first oil-blocking bosses 5-1, and the line connecting the two first oil-blocking bosses 5-1 does not intersect with the axis of the upper intermediate shaft front bearing 5; an even number of second oil-blocking bosses 5-2 are symmetrically provided on the outer periphery of the upper intermediate shaft front bearing 5 between the two first oil-blocking bosses 5-1.

[0038] Its function is to ensure that enough low-temperature lubricating oil can flow into the front bearing 5 of the upper intermediate shaft.

[0039] In this embodiment, two first oil-blocking bosses 5-1 and four second oil-blocking bosses 5-2 are designed above the circumference of the front bearing hole of the upper intermediate shaft in the transmission housing 1. Adjacent second oil-blocking bosses 5-2 form oil collection grooves with the first oil-blocking bosses 5-1 / 2nd oil-blocking bosses 5-2. Figure 5 As shown, the width of the five oil collection grooves is 10mm; the first oil-blocking boss 5-1 is rectangular, and the second oil-blocking boss 5-2 is L-shaped, wherein the L-shaped second oil-blocking boss 5-2 serves the dual function of blocking oil and guiding flow. In this embodiment, the side of the first oil-blocking boss 5-1 and the second oil-blocking boss 5-2 that contacts the transmission housing 1 is lower than the other side, which facilitates the flow of low-temperature lubricating oil to the upper intermediate shaft front bearing 5.

[0040] From a structural perspective, this embodiment requires the first oil-blocking boss 5-1 and the second oil-blocking boss 5-2 to meet two requirements: First, the height of the first oil-blocking boss 5-1 and the second oil-blocking boss 5-2 should not affect the assembly of the upper intermediate shaft assembly (3); Second, the first oil-blocking boss 5-1 and the second oil-blocking boss 5-2 in the circumferential direction should be lower than the weight-reducing ring groove K at the front end of the intermediate shaft transmission gear 4 to avoid interference between the two movements. That is, the maximum outer diameter of the first oil-blocking boss 5-1 and the second oil-blocking boss 5-2 in the circumferential direction is φ120mm~φ124mm.

[0041] In this embodiment, the low-temperature lubricating oil sprayed from the inclined oil hole at point M of the main oil pipe 2 is blocked at point N on the inner side P of the front end of the transmission housing 1. It flows downward along the gap formed between the inner side P of the front end of the transmission housing 1 and the front end face Q of the intermediate shaft transmission gear 4. The low-temperature lubricating oil flowing downward is collected by 6 oil baffles and enters the oil collection groove. Finally, it flows out from the opening of the oil collection groove and enters the upper intermediate shaft front bearing 5, thus realizing the lubrication of the upper intermediate shaft front bearing (5).

[0042] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0044] Furthermore, the various implementation methods disclosed in this solution can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content invented by this disclosure.

Claims

1. A lubrication structure for the front bearing of the intermediate shaft on the main housing of a dual intermediate shaft transmission, characterized in that, Includes a main oil pipe (2) located in the inner cavity of the transmission housing (1) and above the upper intermediate shaft assembly (3). One end of the main oil pipe (2) is connected to the oil pump outlet (7), and the other end of the main oil pipe (2) is sealed and fixed on the side wall of the transmission housing (1) above the front bearing (5) of the upper intermediate shaft. The main oil pipe (2) has an inclined oil hole on its other side wall, and the oil injection line of the inclined oil hole intersects with the side wall of the transmission housing (1) above the front bearing (5) of the upper intermediate shaft.

2. The lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission as described in claim 1, characterized in that, The main oil pipe (2) is located diagonally above the intermediate shaft transmission gear (4).

3. The lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission as described in claim 2, characterized in that, The main tank oil pipe (2) is provided with multiple nozzles facing the upper intermediate shaft assembly (3).

4. The lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission as described in any one of claims 1-3, characterized in that, The upper intermediate shaft front bearing (5) has two first oil-blocking bosses (5-1) on its outer periphery. The line connecting the two first oil-blocking bosses (5-1) does not intersect with the axis of the upper intermediate shaft front bearing (5). An even number of second oil-blocking bosses (5-2) are symmetrically arranged on the outer periphery of the upper intermediate shaft front bearing (5) between the two first oil-blocking bosses (5-1).

5. The lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission as described in claim 4, characterized in that, The first oil baffle (5-1) is rectangular, and the second oil baffle (5-2) is L-shaped.

6. The lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission as described in claim 5, characterized in that, The side of the first oil baffle (5-1) and the second oil baffle (5-2) that contacts the transmission housing (1) is lower than the other side of the first oil baffle (5-1) and the second oil baffle (5-2).

7. The lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission as described in claim 6, characterized in that, The adjacent second oil-blocking boss (5-2) is arranged at equal intervals with the first oil-blocking boss (5-1) / the second oil-blocking boss (5-2).

8. The lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission as described in claim 7, characterized in that, A lubricating oil passage (6) is provided in the side wall of the transmission housing (1) where the front bearing (5) of the upper intermediate shaft is located. The two ends of the lubricating oil passage (6) are connected to one end of the main gearbox oil pipe (2) and the oil pump outlet (7), respectively.

9. The lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission as described in claim 8, characterized in that, The lubricating oil passage (6) and the oil pump outlet (7) are connected to an external water cooling system.

10. The lubrication structure for the front bearing of the intermediate shaft on the main gearbox of a dual intermediate shaft transmission as described in claim 2, characterized in that, There is a gap between the intermediate shaft drive gear (4) and the side wall of the adjacent transmission housing (1).

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