Direct-gear road roller gearbox with auxiliary box

Abstract

The utility model discloses a direct-gear road roller gearbox with an auxiliary box, which comprises a main box and the auxiliary box, and the main box comprises a first shaft assembly, a main box shell, a second shaft assembly, an intermediate shaft assembly and a reversing idle wheel assembly; the auxiliary box comprises an auxiliary box front shell, an auxiliary box rear shell, a driving gear assembly, an idle wheel assembly, an output shaft assembly and a flange assembly. A driving gear assembly in the auxiliary box is connected with a second shaft assembly of the gearbox through an internal spline and meshed with a gear of an idle gear assembly, the gear of the idle gear assembly is meshed with a gear of an output shaft assembly at the same time, the idle gear assembly plays a transition role, the transmission distance is increased, the axle distance is prolonged, and the aim of reducing the axle distance of an output shaft is achieved. The main box is used for achieving speed changing of the gearbox, the auxiliary box is arranged on the right side of the main box and fixed to the main box through bolts, and the auxiliary box is used for reducing the axle distance between the input shaft and the output shaft and achieving the effect that the input shaft and the output shaft are located on the same side of the gearbox so as to meet the requirement for structural arrangement of the road roller.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery roller gearboxes, and specifically to a direct shift roller gearbox with a secondary box. Background Technique

[0002] At present, the engineering series gearboxes produced in China mainly adopt hydraulic control gearboxes, which use a static shaft type wet clutch structure. This type of gearbox has weak climbing ability, high fuel consumption of the main engine, a complex structure that is not conducive to assembly and maintenance, and high manufacturing costs. Content of the Utility Model

[0003] To solve the problems existing in the prior art in the above background technique, the utility model provides a mechanical roller gearbox that can reduce the output shaft distance and directly shift gears, achieving the purpose of simple gearbox structure, low cost, safety and reliability, and convenient maintenance. The utility model provides the following technical solution: A direct shift roller gearbox with a secondary box, including a main box and a secondary box. The main box includes a first shaft assembly, a main box housing, a second shaft assembly, an intermediate shaft assembly, and a reverse idler assembly; the secondary box includes a front secondary box housing, a rear secondary box housing, a driving gear assembly, an idler assembly, an output shaft assembly, and a flange assembly.

[0004] The first shaft assembly is located inside the gearbox and is connected to the clutch. The second shaft assembly and the intermediate shaft assembly are located inside the main box housing. The second shaft assembly and the first shaft assembly are on the same axis. The front end of the second shaft assembly is inserted into the gear inner hole of the first shaft assembly, and a needle bearing is provided between them. The transmission ratio is changed by shifting through a synchronizer assembly. The intermediate shaft assembly is located inside the main box housing and is arranged below the second shaft assembly. The intermediate shaft assembly itself and the gear are integrated. The function of the intermediate shaft assembly is to connect the first shaft assembly and the second shaft assembly. The power of the first shaft assembly is transmitted to the corresponding gears on the second shaft assembly through the intermediate shaft assembly. The reverse idler assembly is located between the second shaft assembly and the intermediate shaft assembly and is a double gear that meshes with the gears on the second shaft assembly and the intermediate shaft assembly at the same time; it plays the role of changing the rotation direction of the driven gear.

[0005] The driving gear assembly in the secondary box is connected to the second shaft assembly of the gearbox through an internal spline and meshes with the gear of the idler assembly. The gear of the idler assembly also meshes with the gear of the output shaft assembly. The idler assembly plays a transitional role. The flange assembly is connected to the output shaft assembly through an internal spline. At the same time, the flange joint surface of the flange assembly is connected to the transmission shaft of the roller main engine through bolts.

[0006] Preferably, the main case further includes a clutch housing assembly, a bearing cover assembly, a main case housing, an upper cover assembly, and a top cover assembly. The clutch housing assembly is located on the left side of the main case housing. The bearing cover assembly is installed outside the bearing of the first shaft assembly. The upper cover assembly is installed on top of the main case housing. The top cover assembly is installed on top of the upper cover assembly. The second shaft assembly and the intermediate shaft assembly are located inside the main case housing.

[0007] Preferably, the second shaft assembly includes a first forward gear, a synchronizer assembly, a first reverse gear, a shift fork, and a shift fork shaft. The first forward gear and the first reverse gear are supported on the journal of the second shaft assembly by a needle bearing with a cage. A set of synchronizer assembly is installed between the two gears and is fixedly connected to the second shaft assembly with involute splines.

[0008] Preferably, the upper cover of the transmission is equipped with a shift fork shaft, and the shift fork installed on the shift fork shaft is fixed by a wave port elastic pin.

[0009] Preferably, the auxiliary case housing is of a front-back split type. After the front auxiliary case housing is connected and positioned with the rear end face of the main case housing, the rear auxiliary case housing is then fixed to it.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] The present utility model can adapt to the main engine layout structure and operation characteristics of the road roller. The input shaft and the output shaft of the road roller are on the same side, and it is necessary to add an auxiliary case to reduce the wheelbase by 500 mm. The shifting mechanism adopts a direct shift structure to realize the operation characteristics of the road roller moving back and forth. The shifting route is simple and smooth, without a gear selection operation, which reduces the operating force and avoids problems such as incorrect gear selection operation, difficult gear selection, and unclear gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the internal structure of the present utility model;

[0013] Figure 2 is a schematic diagram of a partial structure of the second shaft assembly of the present utility model;

[0014] Figure 3 is a schematic diagram of the installation structure of the reverse idler assembly in the present utility model.

[0015] In the shown drawings, clutch housing assembly 1, first shaft assembly 2, bearing cover assembly 3, main case housing 4, upper cover assembly 5, top cover assembly 6, second shaft assembly 7, intermediate shaft assembly 8, reverse idler assembly 9, front auxiliary case housing 10, rear auxiliary case housing 11, driving gear assembly 12, idler assembly 13, output shaft assembly 14, flange assembly 15, first forward gear 16, synchronizer assembly 17, shift fork 18, shift fork shaft 19, first reverse gear 20. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0017] As Figures 1-3 shown, a direct shift road roller transmission with a sub-box includes a main box and a sub-box. The main box includes a first shaft assembly 2, a main box housing 4, a second shaft assembly 7, an intermediate shaft assembly 8, and a reverse idler assembly 9; the sub-box includes a front sub-box housing 10, a rear sub-box housing 11, a driving gear assembly 12, an idler assembly 13, an output shaft assembly 14, and a flange assembly 15.

[0018] The clutch housing assembly 1 is located on the left side of the main box housing 4. Its function is to connect the transmission to the engine and is also the control device of the clutch. The first shaft assembly 2 is located inside the transmission and is connected to the clutch. Its function is to input the power of the engine into the transmission through the control of the clutch. The bearing cover assembly 3 is installed outside the bearing of the first shaft assembly 2. Its function is to axially fix the bearing and play a sealing role to prevent dust from entering and damaging the bearing. The upper cover assembly 5 is installed on the main box housing. Its main function is to achieve gear shifting. The top cover assembly 6 is installed on the upper cover assembly 5 and is connected to the vehicle's operating mechanism through a cable. There is also an external selection shift rocker arm and an internal selection mechanism inside the top cover assembly. The second shaft assembly 7 is located inside the main box housing 4 and is on the same axis as the first shaft assembly 2. The front end of the second shaft assembly 7 is inserted into the gear inner hole of the first shaft assembly 2. There is a needle roller bearing between them. The transmission ratio is changed by shifting through the synchronizer assembly 17, which plays the function of expanding the driving torque and speed. The intermediate shaft assembly 8 is located inside the main box housing 4. The intermediate shaft assembly 8 is arranged below the second shaft assembly 7 and the shaft itself is integrated with the gear. The function of the intermediate shaft assembly 8 is to connect the first shaft assembly 2 and the second shaft assembly 7. The power of the first shaft assembly 2 is transmitted to the corresponding gears on the second shaft assembly 7 through the intermediate shaft assembly 8. By changing the shift lever, different gears can be selected to engage, so that the second shaft assembly 7 can output different speeds, rotations, and torques. The reverse idler assembly 9 is located between the second shaft assembly 7 and the intermediate shaft assembly 8 and is a double gear. By simultaneously engaging with the gears on the second shaft assembly 7 and the intermediate shaft 8, the rotation direction of the driven gear is changed to achieve the reverse function of the transmission.

[0019] The auxiliary box housing is of a front-back split type. After the front housing 10 of the auxiliary box is connected and positioned with the rear end face of the main box housing 4, the rear housing of the auxiliary box is fixed to it. The driving gear assembly 12 in the auxiliary box is connected to the second shaft assembly 7 of the gearbox through an internal spline and meshes with the gear assembly of the idler gear assembly 13. The gear of the idler gear assembly 13 also meshes with the gear of the output shaft assembly 14. The idler gear assembly 13 plays a transitional role, increasing the transmission distance and extending the wheelbase to achieve the purpose of reducing the wheelbase of the output shaft. Finally, the flange assembly 15 is connected to the output shaft assembly 14 through an internal spline, and at the same time, the flange joint surface of the flange assembly 15 is connected to the transmission shaft of the road roller main machine through bolts to output power.

[0020] The utility model belongs to the field of gearboxes for road rollers in construction machinery, and is composed of a main box and an auxiliary box. The function of the main box is to realize gearbox speed change. The auxiliary box is arranged on the right side of the main box and is fixed to the main box through bolts. The function of the auxiliary box is to reduce the wheelbase between the low input shaft and the output shaft and to make the input shaft and the output shaft on the same side of the gearbox to meet the needs of the structural layout of the road roller.

[0021] The operation characteristic of the road roller is forward and backward reciprocating motion. In order to better adapt to this operation characteristic, the first forward gear 16 and the first reverse gear 20 are controlled by a set of synchronizer assembly 17 during the transmission route and gear arrangement, so as to make the operation trajectory linear when switching between the forward gear and the reverse gear.

[0022] As Figure 2 shown, the second shaft assembly 7 includes a first forward gear 16, a synchronizer assembly 17, a first reverse gear 20, a shift fork 18 and a shift fork shaft 19. The first forward gear 16 and the first reverse gear 20 are supported on the journal of the second shaft assembly 7 through needle roller bearings with cages. A set of synchronizer assembly 17 is installed between the two gears and is fixedly connected to the second shaft assembly 7 through involute splines.

[0023] The gearbox upper cover is equipped with a shift fork shaft 19, and a shift fork 18 is installed on the shift fork shaft and fixed by a wave mouth elastic pin. When the shift operation drives the shift arm to swing through a cable, the dial head inside the top cover assembly 6 is connected to the guide block on the shift fork shaft 19. The guide block drives the shift fork shaft 19 to move, the shift fork shaft 19 drives the shift fork 18 to move, and the shift fork 18 drives the gear sleeve in the synchronizer assembly to move, finally realizing shifting.

[0024] Working process of the utility model: When the roller starts, power is transmitted from the engine and clutch assembly to the gear of the first shaft assembly 1 through a spline. The gear of the first shaft assembly 1 meshes with the transmission gear on the intermediate shaft assembly 8, and the power is transmitted to the intermediate shaft assembly 8. Each gear on the intermediate shaft assembly 8 rotates with the intermediate shaft, and each gear on the intermediate shaft assembly 8 drives each gear on the second shaft assembly 7 to rotate. Since each gear of each gear position is in the neutral position, each gear of each gear position on the second shaft assembly 7 is in an idling state, and at this time, the second shaft assembly 7 has no power output. The driver operates the shift lever to shift gears. The shift lever operates the shift selection mechanism through a cable to drive the shift fork shaft 19 to drive the shift fork 18 to move axially. The shift fork 18 further pushes the synchronizer assembly 17 to move, so that the internal spline of the synchronizer assembly 17 is combined with the external spline of the gear on the second shaft assembly 7, and the gear shifting process is completed. In this way, power is transmitted from the engine and clutch assembly 1 to the gear of the first shaft assembly 1 through a spline, then to the intermediate shaft assembly 8 through the transmission gear on the intermediate shaft assembly 8, and through the action of the synchronizer assembly 17, the power is transmitted to the second shaft assembly 7. The driving gear assembly in the auxiliary box at the right end of the second shaft assembly 7 transmits the power to the idler gear assembly 13 of the auxiliary box, and then the idler gear assembly 13 transmits the power to the output shaft assembly 14. Finally, the output shaft assembly 14 outputs the power through a flange, and the roller starts to run.

Claims

1. A direct shift road roller gearbox with an auxiliary box, characterized in that, The invention comprises a main case and an auxiliary case, wherein the main case comprises a first shaft assembly (2), a main case housing (4), a second shaft assembly (7), an intermediate shaft assembly (8) and a reverse idler assembly (9); the auxiliary case comprises an auxiliary case front housing (10), an auxiliary case rear housing (11), a driving gear assembly (12), an idler assembly (13), an output shaft assembly (14) and a flange assembly (15); The first shaft assembly (2) is located in the gearbox and connected to the clutch. The second shaft assembly (7) and the intermediate shaft assembly (8) are located inside the main case housing (4). The second shaft assembly (7) and the first shaft assembly (2) are located on the same axis. The front end of the second shaft assembly (7) is inserted into the inner hole of the gear of the first shaft assembly (2). A needle bearing is arranged between the two. The transmission ratio is changed by shifting the synchronizer assembly (17). The intermediate shaft assembly (8) is located inside the main case housing (4) and arranged below the second shaft assembly (7). The intermediate shaft assembly (8) is integrated with the gear. The intermediate shaft assembly (8) is used to connect the first shaft assembly (2) and the second shaft assembly (7). The power of the first shaft assembly (2) is transmitted to the gears of the corresponding gear positions on the second shaft assembly (7) through the intermediate shaft assembly. The reverse idler wheel assembly (9) is located between the second shaft assembly (7) and the intermediate shaft assembly (8) and is a double gear. It is meshed with the gears on the second shaft assembly (7) and the intermediate shaft assembly (8) at the same time, and plays a role in changing the rotation direction of the driven gear. The driving gear assembly (12) in the auxiliary box is connected to the second shaft assembly (7) of the gearbox through an internal spline, and meshes with the gear assembly of the idler assembly (13). The gear of the idler assembly (13) is also meshed with the gear of the output shaft assembly (14). The idler assembly (13) plays a transition role and is connected to the output shaft assembly (14) through the flange assembly (15) through the internal spline. At the same time, the flange joint surface of the flange assembly (15) is connected to the transmission shaft of the main machine of the roller through bolts.

2. The direct shift road roller gearbox with a secondary case according to claim 1, wherein The main case further comprises a clutch housing assembly (1), a bearing cover assembly (3), a main case housing (4), an upper cover assembly (5) and a top cover assembly (6); the clutch housing assembly (1) is located on the left side of the main case housing (4); the bearing cover assembly (3) is mounted on the outside of the bearing of the first shaft assembly (2); the upper cover assembly (5) is mounted on the main case housing; and the top cover assembly (6) is mounted on the upper cover assembly (5).

3. A direct shift road roller gearbox with an auxiliary box according to claim 1, characterized in that, The second shaft assembly (7) comprises a forward speed gear (16), a synchronizer assembly (17), a reverse speed gear (20), a speed shift fork (18) and a speed shift fork shaft (19). The forward speed gear (16) and the reverse speed gear (20) are supported on the journal of the second shaft assembly (7) through a needle bearing with a retainer. A synchronizer assembly (17) is installed between the two gears and is fixedly connected to the second shaft assembly (7) by an involute spline.

4. The direct shift road roller gearbox with an auxiliary case according to claim 3, characterized in that, The gearbox upper cover is provided with a speed change fork shaft (19), and the speed change fork shaft (19) is provided with a speed change fork (18) which is fixed by a wave mouth elastic pin.

5. A direct shift road roller gearbox with a secondary case according to claim 1, characterized in that, The auxiliary case housing is of a front-back split type. After the front auxiliary case housing (10) is connected and positioned with the rear end face of the main case housing (4), the rear auxiliary case housing (11) is then fixed thereto.

Images