Rear cover assembly capable of being provided with vehicle speed sensor

Abstract

The rear cover assembly capable of being provided with the vehicle speed sensor comprises a rear cover, the rear cover is formed by sequentially and smoothly transitioning a rear cover top, a rear cover waist and a rear cover bottom into a whole, the top is a plane, the bottom is cylindrical, the waist is formed by concaving the middle of a circular-truncated-cone-shaped cylinder, the rear cover bottom is fixedly connected with the middle section of an axle housing, and an oil filling hole is formed in the rear cover top. A vehicle speed sensor insertion hole is further formed in the top of the rear cover, the vehicle speed sensor comprises a sensor head and a sensor gear ring, the sensor head penetrates through the vehicle speed sensor insertion hole and extends into a speed reducer cavity formed by the rear cover and the middle section of the axle housing, and one part of the speed reducer is installed in the speed reducer cavity. The gear ring of the vehicle speed sensor is installed on the large gear ring of the speed reducer, the sensor head corresponds to the sensor gear ring, and a gap is formed between the sensor head and the sensor gear ring. The gear is more compact, small in occupied space and capable of meeting the requirements for configuration space of plate springs, air bags, composite suspensions and the like at the same time.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, and relates to electric drive axle accessories for heavy-duty trucks. Specifically, it relates to an electric drive axle rear cover that can accommodate a vehicle speed sensor, facilitating reducer design. Background Technology

[0002] Heavy-duty trucks and other electric drive axles require two- or multi-speed reducers. The main function of the vehicle speed sensor is to calculate the vehicle speed and measure the output shaft speed of the reducer in real time. This facilitates precise control of the drive motor during gear shifting, which in turn helps the gear shifting actuator to perform the shifting action accurately, improving the success rate of gear shifting and avoiding gear grinding. Currently, the vehicle speed sensor of heavy-duty truck electric drive axles is generally located on the reducer housing.

[0003] For electric drive axles with multi-speed reducers, the vehicle speed sensor is located on the reducer housing. Currently, the rear cover of the reducer housing is generally an arc-shaped shell, resulting in a large space between the reducer and the rear cover. This leads to a less compact reducer structure and a large space occupation, making it impossible to meet the space requirements of configurations such as airbags and composite suspensions. Consequently, some electric drive axle products cannot place the vehicle speed sensor on the reducer housing due to overall vehicle space constraints. Utility Model Content

[0004] The technical problem to be solved by this utility model is that some electric drive axle products cannot arrange vehicle speed sensors on the reducer housing due to space limitations of the whole vehicle. In order to solve the above problem, a rear cover assembly that can install vehicle speed sensors is provided, which facilitates reducer design.

[0005] The objective of this utility model is achieved in the following manner:

[0006] A rear cover assembly for mounting a vehicle speed sensor includes a rear cover, which is formed by a smooth transition between a top, a waist, and a bottom. The top is flat, the bottom is cylindrical, and the waist is formed by an inward concavity in the middle of a frustum-shaped cylinder. The bottom of the rear cover is fixedly connected to the middle section of the axle housing. A filler hole is provided on the top of the rear cover, and a filler plug is installed on the filler hole. A vehicle speed sensor insertion hole is also provided on the top of the rear cover. Here, a Hall effect wheel speed sensor is selected. The vehicle speed sensor includes a sensor head and a sensor gear ring. The sensor head extends through the vehicle speed sensor insertion hole into the reducer cavity formed by the transition between the rear cover and the middle section of the axle housing. A part of the reducer is installed in the reducer cavity. The gear ring of the vehicle speed sensor is installed on the large gear ring of the reducer. The sensor head corresponds to the sensor gear ring, and there is a gap between the sensor head and the sensor gear ring.

[0007] The aforementioned rear cover assembly for mounting a vehicle speed sensor has an upper diameter larger than a lower diameter at the vehicle speed sensor insertion hole, thus forming a limiting surface.

[0008] The aforementioned rear cover assembly for mounting a vehicle speed sensor has a transition joint fitted between the vehicle speed sensor insertion hole and the top of the rear cover.

[0009] In the aforementioned rear cover assembly for mounting a vehicle speed sensor, the upper diameter of the inner hole of the transition joint is larger than the lower diameter, thereby forming a limiting surface.

[0010] The aforementioned rear cover assembly for mounting a vehicle speed sensor has its bottom welded to the middle section of the axle housing.

[0011] The aforementioned rear cover assembly for mounting a vehicle speed sensor has its bottom integrally stamped with the middle section of the axle housing.

[0012] Compared with the prior art, the present invention has the following technical effects:

[0013] The gap between the rear cover and the reducer in this invention is small, reducing the space occupied. The vehicle speed sensor is mounted on the rear cover. This structural design significantly reduces the amount of gear oil needed, while the gears are more compact, occupying less space and simultaneously meeting the space requirements of leaf springs, airbags, and composite suspension. This structure also reduces the amount of gear oil needed. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a reference diagram showing the usage state of this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0017] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component 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.

[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0020] The following is combined with Figure 1 The structure of this utility model is described in detail.

[0021] A rear cover assembly for mounting a vehicle speed sensor includes a rear cover, wherein the rear cover is formed by a smooth transition between a top portion 7, a waist portion 9, and a bottom portion 6, which can be integrally stamped or machined by other methods. The top portion is flat, the bottom portion is cylindrical, and the waist portion is formed by a concave in the middle of a frustum-shaped cylinder, i.e., two frustum-shaped cylinders are smoothly transitioned into one piece. The angle between the axis and generatrix of the frustum near the top of the rear cover is smaller than the angle between the axis and generatrix of the frustum near the middle section of the axle housing. The bottom of the rear cover is fixedly connected to the middle section 10 of the axle housing. An oil filler hole is located on the top of the rear cover, and an oil filler plug 8 is installed on the hole. A vehicle speed sensor insertion hole 2 is also located on the top of the rear cover. This vehicle speed sensor is a Hall effect wheel speed sensor, consisting of a sensor head 1 and a sensor gear ring 5. The sensor head passes through the insertion hole and extends into the reducer cavity formed by the rear cover and the middle section of the axle housing. A portion of the reducer 11 is installed within the reducer cavity. The gear ring 5 of the vehicle speed sensor is mounted on the large gear ring 4 of the reducer. The sensor head 1 corresponds to the sensor gear ring 5, and there is a gap between them. This structure results in a very small gap between the rear cover and the reducer, reducing the amount of gear oil needed and also reducing the space occupied by the reducer housing.

[0022] The rear cover assembly for mounting a vehicle speed sensor described in this utility model has a transition joint 3 fitted between the vehicle speed sensor insertion hole and the top of the rear cover. The transition joint is designed to facilitate replacement and maintenance.

[0023] In order to limit the insertion depth of the vehicle speed sensor, the rear cover assembly for mounting the vehicle speed sensor described in this utility model has a transition joint with an upper inner diameter larger than the lower inner diameter, thereby forming a vehicle speed sensor limiting surface 12. This design corresponds to the structure of the vehicle speed sensor.

[0024] The rear cover assembly for mounting a vehicle speed sensor described in this utility model has its bottom welded to the middle section of the axle housing.

[0025] For large-tonnage electric drive axles, the rear cover assembly for mounting vehicle speed sensors described in this utility model can be configured with the following structure: the bottom of the rear cover is integrally stamped with the middle section of the axle housing, and a vehicle speed sensor mounting hole is directly machined on the top of the rear cover. In order to limit the insertion depth of the vehicle speed sensor, the insertion hole of the vehicle speed sensor is designed with an upper diameter larger than the lower diameter, thereby forming a vehicle speed sensor limiting surface. This design corresponds to the structure of the vehicle speed sensor.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A rear cover assembly for mounting a vehicle speed sensor, comprising a rear cover, characterized in that: The rear cover is formed by a smooth transition between the top, waist, and bottom sections. The top is flat, the bottom is cylindrical, and the waist is formed by an indentation in the middle of a frustum-shaped cylinder. The bottom of the rear cover is fixedly connected to the middle section of the axle housing. A filler hole is provided on the top of the rear cover, and a filler plug is installed on the filler hole. A vehicle speed sensor insertion hole is also provided on the top of the rear cover. The vehicle speed sensor includes a sensor head and a sensor gear ring. The sensor head extends through the vehicle speed sensor insertion hole into the reducer cavity formed by the transition between the rear cover and the middle section of the axle housing. A part of the reducer is installed in the reducer cavity. The gear ring of the vehicle speed sensor is installed on the large gear ring of the reducer. The sensor head corresponds to the sensor gear ring, and there is a gap between the sensor head and the sensor gear ring.

2. The rear cover assembly for mounting a vehicle speed sensor according to claim 1, characterized in that: The upper diameter of the vehicle speed sensor insertion hole is larger than the lower diameter, thus forming a limiting surface.

3. The rear cover assembly for mounting a vehicle speed sensor according to claim 1, characterized in that: A transition joint is fitted between the vehicle speed sensor insertion hole and the top of the rear cover.

4. The rear cover assembly for mounting a vehicle speed sensor according to claim 1, characterized in that: The bottom of the rear cover is welded to the middle section of the bridge housing.

5. The rear cover assembly for mounting a vehicle speed sensor according to claim 1, characterized in that: The bottom of the rear cover is integrally stamped with the middle section of the bridge housing.

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