Rear face blowing mode mechanism of automobile air conditioning cabinet

Abstract

The utility model relates to a rear face blowing mode mechanism of an automobile air conditioning box. The rear face blowing mode mechanism comprises a cam disc, a rocker arm gear, a connecting rod gear, a front face blowing air door and a rear face blowing air door. The front face blowing air door is connected with a rocker arm gear through a spline, the rocker arm gear is in meshing transmission with a connecting rod gear, a pin of the connecting rod gear is arranged in a face blowing track groove of a cam disc, and an actuator drives the cam disc to achieve opening and closing of the front face blowing air door. The front face blowing air door and the rear face blowing air door are linked through a connecting rod, the two ends of the connecting rod are rotationally connected with supporting arms of the two air doors respectively, and the supporting arms are provided with bushes to reduce friction. The front face blowing air door can be divided into a left part and a right part which are linked through a spline, and a connecting rod is connected to drive the rear face blowing air door. A cam disc track groove does not need to be additionally arranged, the structure is compact, cost is low, stability is high, platformization is achieved through the universal lining, multiple modes of defrosting, face blowing, foot blowing and back face blowing can be achieved only through a single actuator, the air conditioner is suitable for small air conditioner boxes, and product competitiveness is improved.

Description

Technical Field

[0001] This utility model belongs to the field of automotive air conditioning technology and relates to a rear-blowing mode mechanism for automotive air conditioning units. Background Technology

[0002] As a crucial component of automobiles, automotive air conditioning plays an indispensable role in modern life. With socio-economic development and rising living standards, automobile design and functionality are continuously evolving, particularly with the increasing demand for interior comfort. Traditional automotive air conditioning systems primarily focus on front-row airflow, providing cool or warm air to the driver and front passengers through the front vents. However, with the expansion of automotive interior spaces, especially the widespread adoption of mid-to-large-sized sedans, SUVs, and MPVs, front-row airflow alone is insufficient to fully meet the comfort needs of rear passengers. Therefore, rear-row airflow functionality has gradually become an important development direction for automotive air conditioning systems, and rear-facing airflow mode, as a form of rear-row air delivery, has received widespread attention.

[0003] Currently, in automotive air conditioning systems, the structural design with rear-blowing function mainly falls into two types. The first common structure involves the rear-blowing damper being controlled by a rear-blowing linkage, where the pin of the linkage is positioned within a groove on a cam disc. When the actuator drives the cam disc to rotate, the pin moves along the groove, thereby actuating the rear-blowing linkage and the rear-blowing damper to open or close the rear-blowing mode. However, this structure has several significant drawbacks in practical applications: First, to achieve multiple modes such as surface blowing, defrosting, foot blowing, and rear-blowing, multiple grooves need to be arranged on the cam disc, directly leading to a significant increase in the cam disc's diameter. Since the cam disc is typically manufactured using plastic injection molding, the larger the size, the higher the risk of deformation during injection molding, making it difficult to guarantee processing accuracy. This not only increases manufacturing difficulty but also drives up production costs. Second, during operation, the rocker arm of the rear-blowing linkage risks disengaging from the groove. If this occurs, the rear-blowing mode will fail, severely impacting the reliability of the air conditioning system. Furthermore, this design is relatively complex and space-consuming, severely limiting space layout for small air conditioning unit projects and making compact design difficult. Finally, due to the high degree of component specialization, this structure is difficult to apply across different vehicle models, limiting its versatility and increasing R&D and production costs.

[0004] The second common structure uses independent actuators to directly drive the rear air intake damper. This design directly controls the opening and closing of the damper through the actuator, avoiding the complexity of the cam disc track groove design and improving system stability to some extent. However, the disadvantages of this structure are also obvious: each damper requires an independent actuator, which significantly increases hardware costs. For the cost-effective automotive manufacturing industry, this solution is less economical, especially in large-scale mass production, where the cost disadvantage is particularly pronounced. Furthermore, the use of multiple actuators increases the system's control complexity and maintenance difficulty, which is detrimental to long-term reliability.

[0005] In summary, existing rear-blowing mode mechanisms generally suffer from the following problems in practical applications: First, the complex cam disc structure leads to high manufacturing costs and difficulty in controlling precision; second, insufficient operational stability poses a risk of mode failure; third, they occupy a large space, making them unsuitable for miniaturized designs; fourth, they lack platform-based design capabilities, hindering the standardization of parts; and fifth, direct-drive solutions are too costly and economically inefficient. These problems limit the further promotion and optimization of rear-blowing mode mechanisms in automotive air conditioning systems. Therefore, a novel rear-blowing mode mechanism that balances cost, stability, space utilization, and platform-based design is urgently needed to meet the development needs of modern automotive air conditioning systems. Utility Model Content

[0006] In view of this, the present invention provides a rear air blowing mode mechanism for automotive air conditioning units to solve the problems of high manufacturing cost, large space occupation, insufficient stability and difficulty in platformization in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A rear-blowing mode mechanism for an automotive air conditioning unit includes a cam disc, a rocker arm gear, a connecting rod gear, a front-blowing damper, and a rear-blowing damper. The front-blowing damper and the rocker arm gear are connected by a spline. The rocker arm gear and the connecting rod gear mesh and transmit power. The connecting rod gear is provided with a pin placed in the blowing trajectory groove of the cam disc. An actuator drives the cam disc to rotate, thereby realizing the opening and closing of the front-blowing damper. A connecting rod is provided between the front-blowing damper and the rear-blowing damper. The two ends of the connecting rod are rotatably connected to the front-blowing damper and the rear-blowing damper, respectively, so that the front-blowing damper drives the rear-blowing damper through the connecting rod to achieve linkage.

[0009] Furthermore, a support arm is fixedly provided on each of the front blowing air damper and the rear blowing air damper, and the two ends of the connecting rod are respectively rotatably connected to the two support arms.

[0010] Furthermore, the support arm is provided with a circular hole, and a bushing is provided inside the circular hole, with the end of the connecting rod rotatably disposed within the bushing.

[0011] Furthermore, the front blowing air damper includes a left front blowing air damper and a right front blowing air damper; the left front blowing air damper and the right front blowing air damper are connected by a spline to realize the linkage between the left front blowing air damper and the right front blowing air damper; the connecting rod is connected to the left front blowing air damper or the right front blowing air damper.

[0012] Furthermore, the trajectory shape of the blowing trajectory groove of the cam disk is an arc or a combination of multiple curves, which is used to control the opening and closing angle and timing of the front blowing damper and the rear blowing damper.

[0013] Furthermore, the support arm is fixedly connected to the front blowing air damper or the rear blowing air damper by integral molding or screw connection to enhance structural stability.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This structure utilizes the connecting rod between the front and rear blowing dampers to achieve linkage, completing the control of the blowing mode without increasing the number of cam disk track grooves. This simplifies the cam disk design, reduces manufacturing costs, and also reduces the quality risks caused by excessively large cam disk sizes.

[0016] 2. The structure is compact and occupies little space, making it suitable for the layout requirements of small air conditioning units and improving design flexibility.

[0017] 3. The adoption of a universal bushing connection method not only improves the durability between the connecting rod and the support arm, but also enables the platform design of some components, saving R&D time and manufacturing costs.

[0018] 4. By eliminating the traditional rear-blown rocker arm structure, mold development costs are reduced, further lowering production costs.

[0019] 5. Multiple modes such as defrosting, face blowing, foot blowing, and post-face blowing can be achieved using only one actuator, which is cost-effective and significantly enhances the product's market competitiveness.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1This is a schematic diagram of the rear-blowing mode mechanism of the automotive air conditioning unit in this utility model.

[0023] Figure 2 This is a left-side view of the rear-blowing mechanism of the automotive air conditioning unit during installation.

[0024] Figure 3 This is a right-side view of the rear-blowing mechanism of the automotive air conditioning unit in this utility model during installation.

[0025] Reference numerals in the attached diagram: 1-Cam disc; 2-Connecting rod gear; 3-Rocker arm gear; 4-Left front blowing damper; 5-Right front blowing damper; 6-Rear blowing damper; 7-Connecting rod; 8-Support arm. Detailed Implementation

[0026] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0028] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] Please see Figures 1-3The overall structure of the rear air blowing mode mechanism of the car air conditioning unit provided by this utility model includes a cam plate 1, a connecting rod gear 2, a rocker arm gear 3, a left front air blowing damper 4, a right front air blowing damper 5, a rear air blowing damper 6, a connecting rod 7, and a support arm 8. Figure 1 The assembly relationship and transmission principle between the various components are demonstrated. The cam disk 1, as the core driving component, has a blowing trajectory groove to guide the movement of the connecting rod gear 2. A pin is fixed to the connecting rod gear 2, and this pin is embedded in the blowing trajectory groove of the cam disk 1. The trajectory shape of the blowing trajectory groove of the cam disk 1 is arc-shaped or a combination of multiple curves, used to control the opening angle and timing of the front and rear blowing dampers.

[0030] The rocker arm gear 3 is connected to the connecting rod gear 2 via gear meshing, and is fixedly connected to the left front blowing damper 4 and the right front blowing damper 5 via splines. The left front blowing damper 4 and the right front blowing damper 5 are also connected by splines to achieve synchronous rotation. The front blowing dampers (including the left front blowing damper 4 and the right front blowing damper 5) and the rear blowing damper 6 are linked by a connecting rod 7, and the two ends of the connecting rod 7 are rotatably connected to the support arms 8 fixed on the dampers.

[0031] A support arm 8 is fixed to the left front blowing damper 4. The support arm 8 is fixedly connected to the front or rear blowing damper by integral molding or screw connection. The support arm 8 is provided with a round hole, and a bushing is installed in the round hole. One end of the connecting rod 7 is rotatably connected to the support arm 8 through the bushing. The bushing effectively reduces the friction between the connecting rod 7 and the support arm 8, improving the smoothness and durability of rotation. The cam disk 1 is driven by an actuator (not shown in the figure). When the actuator is started, the cam disk 1 rotates, driving the pin of the connecting rod gear 2 to move along the blowing trajectory groove, thereby driving the left front blowing damper 4 and the right front blowing damper 5 to open and close through the rocker arm gear 3.

[0032] like Figure 3 As shown, the connection details between the rear blowing damper 6 and the connecting rod 7 are further displayed from the right-hand perspective. A support arm 8 is also fixed to the rear blowing damper 6, and the other end of the connecting rod 7 is rotatably connected to the support arm 8 of the rear blowing damper 6 via a bushing. When the left front blowing damper 4 and the right front blowing damper 5 rotate under the drive of the rocker arm gear 3, the rear blowing damper 6 opens and closes synchronously through the transmission of the connecting rod 7, thus completing the linkage control of the front and rear blowing modes.

[0033] In this embodiment, the working process is as follows: The actuator drives the cam disk 1 to rotate, and the pin of the connecting rod gear 2 moves along the blowing track groove of the cam disk 1, driving the connecting rod gear 2 to rotate. The connecting rod gear 2 drives the rocker arm gear 3 through gear meshing, and the rocker arm gear 3 in turn drives the left front blowing damper 4 and the right front blowing damper 5 to rotate through the spline. Since the left front blowing damper 4 and the right front blowing damper 5 are connected by the spline, they remain synchronized. The support arm 8 on the left front blowing damper 4 (or the right front blowing damper 5) pulls the support arm 8 on the rear blowing damper 6 through the connecting rod 7, so that the rear blowing damper 6 opens and closes synchronously with the front blowing damper. By adjusting the design of the blowing track groove of the cam disk 1, multiple modes such as defrosting, blowing the face, blowing the feet, and rear blowing can be switched.

[0034] The advantages of this implementation are that it can achieve multiple control modes using only one actuator, resulting in a compact structure and high stability. The support arm 8 and connecting rod 7 are connected using a universal bushing, facilitating standardized production of parts and making it suitable for air conditioning unit designs in various vehicle models. By eliminating the traditional rear-blowing rocker arm structure, manufacturing costs are further reduced, enhancing the product's market competitiveness.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rear-blowing mode mechanism for an automotive air conditioning unit, comprising a cam disc, a rocker arm gear, a connecting rod gear, a front-blowing damper, and a rear-blowing damper, wherein the front-blowing damper and the rocker arm gear are connected by a spline, the rocker arm gear and the connecting rod gear mesh and transmit power, and the connecting rod gear is provided with a pin placed in a blowing trajectory groove of the cam disc; an actuator drives the cam disc to rotate, thereby realizing the opening and closing of the front-blowing damper, characterized in that: A connecting rod is provided between the front blowing air damper and the rear blowing air damper. The two ends of the connecting rod are rotatably connected to the front blowing air damper and the rear blowing air damper respectively, so that the front blowing air damper drives the rear blowing air damper through the connecting rod to achieve linkage.

2. The automotive air conditioning unit rear-blowing mode mechanism according to claim 1, characterized in that: Each of the front blowing air damper and the rear blowing air damper is fixedly provided with a support arm, and the two ends of the connecting rod are respectively rotatably connected to the two support arms.

3. The automotive air conditioning unit rear-blowing mode mechanism according to claim 2, characterized in that: The support arm has a circular hole, and a bushing is provided inside the circular hole. The end of the connecting rod is rotatably located inside the bushing.

4. The automotive air conditioning unit rear-blowing mode mechanism according to claim 1, characterized in that: The front blowing air damper includes a left front blowing air damper and a right front blowing air damper; the left front blowing air damper and the right front blowing air damper are connected by a spline to realize the linkage between the left front blowing air damper and the right front blowing air damper; the connecting rod is connected to the left front blowing air damper or the right front blowing air damper.

5. The automotive air conditioning unit rear-blowing mode mechanism according to claim 1, characterized in that: The trajectory shape of the blowing surface groove of the cam disk is an arc or a combination of multiple curves.

6. The automotive air conditioning unit rear-blowing mode mechanism according to claim 2 or 3, characterized in that: The support arm is fixedly connected to the front blowing air door or the rear blowing air door by integral molding or screw connection.

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