A lightweight transfer case and crane

Abstract

This utility model discloses a lightweight transfer case and crane, belonging to the technical field of crane transfer cases. It includes: a transfer case housing, a clutch housing, and a flange; the transfer case housing has an internal support structure and bearing mounting seats; the clutch housing is fixedly installed on one side of the transfer case housing; the flange is fixedly installed on the other side of the transfer case housing; the transfer case housing is an irregularly shaped part, with a trapezoidal upper half and a rectangular lower half, and the longer side of the lower half has several protrusions for heat dissipation; the bearing mounting seats are axially aligned with the flange and the clutch housing; the transfer case housing has a first mounting hole on the side facing the clutch housing, and multiple second mounting holes and a first input shaft mounting hole on the side facing the flange; the support structure is disposed between the inner surfaces of the first and second mounting holes. This utility model increases natural heat dissipation performance and enhances the overall rigidity of the transfer case by increasing the support structure through protrusions.

Description

Technical Field

[0001] This utility model relates to a lightweight transfer case, belonging to the technical field of crane transfer cases. Background Technology

[0002] Transfer cases are widely used in construction machinery, mining machinery, medical machinery, wind power machinery, and other machinery that requires relative power transmission and distribution, such as cranes, excavators, wind turbines, and tunnel boring machines. They are important components in construction machinery; especially the upper-car transfer case, which is the core component of the upper-car transmission in crane products. Its level of electrification, intelligence, and lightweighting directly determines the electrification level of the entire machine.

[0003] In the prior art, patent CN214331437U discloses a transfer case that integrates the radiator and oil pump on the transfer case. Although this structure can achieve cooling, it will further increase the mass of the transfer case and rely on an external forced lubrication cooling system for heat dissipation, which is complex and costly.

[0004] Secondly, the transfer cases currently used in the industry can only dissipate heat naturally in high-temperature scenarios, resulting in poor heat dissipation performance. With long-term use, the internal seals are prone to aging. During natural heat dissipation, the transfer case cannot operate at full load for extended periods. Furthermore, the components are all made of carbon steel, especially the outer shell, which is made of cast iron or cast steel, making it quite heavy. Typically, the overall weight of a transfer case is over 300 kg, which further increases vehicle energy consumption and limits vehicle flexibility. Although there are existing technologies that can reduce the weight of the transfer case, weight reduction will lead to a decrease in structural durability. Utility Model Content

[0005] Purpose of the utility model: The purpose of this utility model is to overcome the shortcomings of the prior art and provide a lightweight transfer case and crane. The transfer case housing is designed with heat dissipation protrusions to increase natural heat dissipation performance, which can improve heat dissipation performance without the need for additional heat dissipation devices. At the same time, the support structure is used to improve the overall rigidity of the transfer case.

[0006] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution: In a first aspect, this utility model provides a lightweight transfer case, comprising: The transfer case housing has an internal support structure and bearing mounting base; The clutch housing is fixedly installed on one side of the transfer case housing; The flange is fixedly installed on the other side of the transfer case housing; The transfer case housing is an irregularly shaped part, with a trapezoidal upper half and a rectangular lower half. The longer side of the lower half has several protrusions for heat dissipation. The bearing mounting base is axially aligned with the flange and the clutch housing, respectively. The transfer case housing has a first mounting hole on the side facing the clutch housing, and multiple second mounting holes and a first input shaft mounting hole on the side facing the flange. The support structure is disposed between the inner surfaces of the first mounting hole and the second mounting hole.

[0007] Optionally, the support structure includes a support rib installed inside the transfer case housing, a steel sleeve pre-embedded in the bearing mounting seat, and a reinforcing rib installed inside the transfer case housing. One side of the supporting stiffener is connected to the inner surface of the second mounting hole, and the other side is connected to the inner surface of the first mounting hole. The reinforcing ribs are arranged radially along the bearing mounting seat and the steel sleeve, and are distributed in a radial pattern.

[0008] Optionally, a matching connecting sleeve is installed on both the first and second mounting holes. The connecting sleeve has several mounting holes for fixing to the flange and clutch housing by bolts.

[0009] Optionally, the transfer case housing, the clutch housing, and the flange are all made of aluminum.

[0010] Optionally, the clutch housing is further provided with a second input shaft mounting hole corresponding to the first input shaft mounting hole, for insertion with the input shaft, wherein the input shaft passes through the transfer case housing and the clutch housing and is connected to the power source.

[0011] Optionally, the steel sleeve faces the flange for insertion into the output shaft, and the other end of the output shaft is connected to the hydraulic pump via the flange; The number of output shafts is the same as the number of flanges, consisting of one or more shafts used to distribute power to multiple hydraulic pumps.

[0012] Optionally, the outer side of the transfer case housing is also provided with several wire threaded sleeves for screwing and fixing to the upper part of the crane.

[0013] Secondly, this utility model provides a crane, wherein the upper part of the crane is provided with the transfer case described in the first aspect.

[0014] Beneficial effects: Compared with the prior art, this utility model has the following advantages: A supporting structure is added inside the transfer case housing to increase its rigidity. At the same time, a heat dissipation structure is set at the bottom of the transfer case housing to accelerate heat dissipation with the help of other heat dissipation devices and without increasing weight.

[0015] The transfer case housing bearing mounting base features radiating reinforcing ribs around its perimeter, reducing the transfer case weight, enhancing the stress resistance of the housing surface, and improving the support rigidity between the first and second mounting holes, thereby increasing the transfer case's operational reliability. This solves the problem of current transfer cases being too heavy and failing to meet the requirements for overall electrification and lightweighting. Attached Figure Description

[0016] Figure 1 The image shown is a side view of the lightweight transfer case assembly of this utility model. Figure 1 ; Figure 2 The image shown is a side view of the lightweight transfer case assembly of this utility model. Figure 2 ; Figure 3 The image shown is a perspective view of the lightweight transfer case assembly of this utility model; Figure 4 The diagram shown is a schematic of the lightweight transfer case of this utility model.

[0017] In the diagram: 1-Clutch housing; 2-Transfer case housing; 2-1-Support rib; 2-2-Second mounting hole; 2-3-Wire thread insert; 2-4-Steel sleeve; 2-5-First mounting hole; 2-6-Reinforcing rib; 2-7-Bearing mounting seat; 2-8-Connecting sleeve; 3-Flange; 4-Input shaft; 5-Output shaft Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0019] Example 1

[0020] This embodiment provides a lightweight transfer case, such as Figure 1 The diagram shows: a transfer case housing 2, a clutch housing 1, and a flange 3; wherein, the transfer case housing 2 has an internal support structure and bearing mounting seats 2-7; the clutch housing 1 is fixedly installed on one side of the transfer case housing 2, and the flange 3 is fixedly installed on the other side of the transfer case housing 2; the transfer case housing 2 is an irregularly shaped part, with a trapezoidal upper half and a rectangular lower half, and the longer side of the lower half has several protrusions. These protrusions extend the housing surface, significantly increasing the contact area with air, thereby enhancing the natural heat dissipation capacity of the transfer case housing 2. Figure 2 The clutch housing 1 shown is used for insertion with the input shaft 4, enabling the transfer case input shaft 4 to be connected to the clutch. Figure 3As shown, the transfer case housing 2 also includes bearing mounting seats 2-7. There are multiple bearing mounting seats 2-7, all installed inside the transfer case housing 2 and axially corresponding to the flange 3 and clutch housing 1, respectively. A first mounting hole 2-5 is provided on the side of the transfer case housing 2 facing the clutch housing 1, and multiple second mounting holes 2-2 and a first input shaft 4 mounting hole are provided on the side facing the flange 3. One of the bearing mounting seats 2-7 is located at the first input shaft 4 mounting hole for mounting with the input shaft 4 via a bearing. A support structure connects the inner surfaces of the first mounting holes 2-5 and the second mounting holes 2-2 to enhance the support rigidity of the first mounting holes 2-5 and the second mounting holes 2-2 and improve the overall resistance to deformation.

[0021] Optionally, the support structure includes: a support rib plate 2-1, a steel sleeve 2-4, and a reinforcing rib plate 2-6; the support rib plate 2-1 is installed inside the transfer case housing 2, the steel sleeve 2-4 is embedded in the bearing mounting seat 2-7, and the reinforcing rib plate 2-6 is installed inside the transfer case housing 2. One side of the support rib 2-1 is connected to the inner surface of the second mounting hole 2-2, and the other side is connected to the inner surface of the first mounting hole 2-5. The first mounting hole 2-5 and the second mounting hole 2-2 are radially connected to the clutch housing 1 and the flange 3, respectively. When the input shaft 4 and the output shaft 5 of the transfer case housing 2 transmit power, the input shaft 4 and the output shaft 5 transmit torsional stress and radial load to the clutch housing 1 and the flange 3, respectively. Therefore, without the design of the support rib 2-1, the first mounting hole 2-5 and the second mounting hole 2-2 are easily deformed by stress or impact. The shape of the support rib 2-1 is not limited. The circumferential and axial support frame can be designed between the two holes according to the application scenario and model of the transfer case.

[0022] The reinforcing ribs 2-6 are arranged radially along the bearing mounting seat 2-7 and the steel sleeve 2-4, and are distributed in a radial pattern. The radially and radially distributed reinforcing ribs 2-6 enhance the connection rigidity between the bearing mounting seat 2-7 and the steel sleeve 2-4 and the transfer case housing 2. When the output shaft 5 is subjected to corresponding torque and bending moment, it transmits force to the steel sleeve 2-4 and the bearing mounting seat 2-7. After the bearing mounting seat 2-7 is subjected to force, stress concentration will occur between the bearing mounting seat 2-7 and the transfer case housing 2, especially at the edge of the bearing mounting seat 2-7. Therefore, without the radial and radial arrangement of the reinforcing ribs 2-6, it is very easy to cause deformation of the transfer case housing 2, which will eventually lead to the ellipticization of the first mounting hole 2-5 and the second mounting hole 2-2, affecting the transmission accuracy. In this embodiment, the reinforcing ribs 2-6 and the transfer case housing are integrally molded.

[0023] Optional, such as Figure 4As shown, a matching connecting sleeve 2-8 is installed on both the first mounting hole 2-5 and the second mounting hole 2-2. The connecting sleeve 2-8 has several mounting holes for fixing to the flange 3 and the clutch housing 1 by bolts.

[0024] Optionally, the transfer case housing 2, the clutch housing 1, and the flange 3 are all made of aluminum. Compared with the prior art, which uses cast iron or cast steel housings, this embodiment can greatly reduce the weight of the transfer case.

[0025] Optionally, the clutch housing 1 is further provided with a second input shaft 4 mounting hole corresponding to the mounting hole of the first input shaft 4, for insertion into the input shaft 4, wherein the input shaft 4 passes through the transfer case housing 2 and the clutch housing 1 and is connected to the power source.

[0026] Optionally, the steel sleeve 2-4 faces the flange 3 for insertion into the output shaft 5, and the other end of the output shaft 5 is connected to the hydraulic pump through the flange 3; The number of output shafts 5 is the same as the number of flanges 3, consisting of one or more for distributing power to multiple hydraulic pumps.

[0027] Optionally, the outer side of the transfer case housing 2 is also provided with several wire thread sleeves 2-3 for screwing and fixing to the upper part of the crane, thereby enhancing the strength of the threaded connection, preventing stripping and loosening, and facilitating multiple disassemblies.

[0028] Working principle: The clutch housing 1 and flange 3 are respectively bolted onto the connecting sleeve 2-8 of the first mounting hole 2-5 and the second mounting hole 2-2. Then, the input shaft 4 and output shaft 5 are sequentially assembled with the transfer case housing 2, the clutch housing 1, and the flange 3. The input shaft 4 passes through the first input shaft 4 mounting hole and the second input shaft 4 mounting hole and connects to the power source. The number of output shafts 5 is the same as that of the support ribs 2-1. One end of the output shaft 5 is located in the transfer case and is connected to the bearing through the steel sleeve 2-4. The other end is connected to the hydraulic pump. Therefore, the connection between the output shaft 5 and the hydraulic pump needs to withstand the reaction torque when the hydraulic pump starts or runs. This utility model uses the bearing to withstand the radial force generated by the reaction torque, preventing the output shaft 5 from shifting or bending.

[0029] In this embodiment, the input shaft 4 is connected to the power end of the engine or motor, transmitting power to the clutch through the transfer case. During power transmission, the inner surfaces of the first mounting hole 2-5 and the second mounting hole 2-2 are supported by the support structure ribs 2-1, respectively, to prevent axial displacement of the first mounting hole 2-5 and the second mounting hole 2-2, which would affect the connection accuracy with the clutch and flange 3. The inner surface of the transfer case housing 2 is reinforced by the steel sleeve 2-4 and the reinforcing ribs 2-6 to prevent stress deformation of the transfer case housing 2 caused by the input shaft 4 and the output shaft 5, and to prevent ellipticization of the first mounting hole 2-5, the second mounting hole 2-2, and the mounting hole of the first input shaft 4, which would affect the transmission accuracy.

[0030] Finally, when the transfer case is used at high temperatures, the heat dissipation protrusions designed on its surface increase the natural heat dissipation rate, eliminating the need for additional heat dissipation devices and improving heat dissipation performance while reducing the weight of the transfer case.

[0031] Example 2

[0032] This embodiment provides a crane, the upper part of which is equipped with the transfer case described in Embodiment 1.

[0033] In summary, this utility model adds a support structure inside the transfer case housing to improve the rigidity of the transfer case housing, and at the same time sets a heat dissipation structure at the bottom of the transfer case housing to accelerate heat dissipation with the help of other heat dissipation devices and without increasing weight.

[0034] The transfer case housing bearing mounting base features radiating reinforcing ribs around its perimeter, reducing the transfer case weight while enhancing the housing's strength and support rigidity, thus improving operational reliability. This solves the problem of current transfer cases being too heavy and failing to meet the requirements for overall electrification and lightweight design.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A lightweight transfer case, characterized in that, include: The transfer case housing has an internal support structure and bearing mounting base; The clutch housing is fixedly installed on one side of the transfer case housing; The flange is fixedly installed on the other side of the transfer case housing; The transfer case housing is an irregularly shaped part, with a trapezoidal upper half and a rectangular lower half. The longer side of the lower half has several protrusions for heat dissipation. The bearing mounting base is axially aligned with the flange and the clutch housing, respectively. The transfer case housing has a first mounting hole on the side facing the clutch housing, and multiple second mounting holes and a first input shaft mounting hole on the side facing the flange. The support structure is disposed between the inner surfaces of the first mounting hole and the second mounting hole.

2. The light weight transfer case of claim 1 wherein, The support structure includes a support rib installed inside the transfer case housing, a steel sleeve embedded in the bearing mounting seat, and a reinforcing rib installed inside the transfer case housing. One side of the supporting stiffener is connected to the inner surface of the second mounting hole, and the other side is connected to the inner surface of the first mounting hole. The reinforcing ribs are arranged radially along the bearing mounting seat and the steel sleeve, and are distributed in a radial pattern.

3. The light weight transfer case of claim 1 wherein, Both the first and second mounting holes are fitted with matching connecting sleeves, and the connecting sleeves are provided with several mounting holes for fixing to the flange and clutch housing by bolts.

4. The light weight transfer case of claim 1 wherein, The transfer case housing, the clutch housing, and the flange are all made of aluminum.

5. The light weight transfer case of claim 1 wherein, The clutch housing is also provided with a second input shaft mounting hole corresponding to the first input shaft mounting hole, for insertion with the input shaft. The input shaft passes through the transfer case housing and the clutch housing and is connected to the power source.

6. The light weight transfer case of claim 2 wherein, The steel sleeve faces the flange and is used to insert with the output shaft. The other end of the output shaft is connected to the hydraulic pump through the flange. The number of output shafts is the same as the number of flanges, consisting of one or more shafts used to distribute power to multiple hydraulic pumps.

7. The light weight transfer case of claim 1 wherein, The outer side of the transfer case housing is also provided with several wire threaded sleeves for screwing and fixing to the upper part of the crane.

8. A crane, characterized in that, The crane is equipped with a transfer case as described in any one of claims 1-7.

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